Today is July 31st. It's the 212th day of the year. 153 days remain. It's week 31 of the year.
Unless noted, the following data is based upon observations collected by the National Weather Service, Chicago, at O'Hare International Airport (ORD) between November 1978 and last year. ORD has been the official site of record for Chicago since Thursday, January 17, 1980.
According to the National Climatic Data Center (NCDC), the normal high is 83 and the normal low is 64. I've calculated the 32-year averages at 85 and 65.
On the hot side, in 2006 the high was the record high of 99 with a low of 76. The record high of 99 originally occurred in 1945. In 1995 the high was 95 with a low of 74. Highs of 94 occurred in the back-to-back years of 2001 and 2002. Other warm lows were 76 in 1999 and 75 in 1980. The record warmest low of 79 occurred back in 1917. The official thermometer was located near Lake Michigan at the time. 17 of the past 32 highs (53%) were in the 80s. Eight highs (25%) were in the hot 90s. Seven highs (22%) were in the cool: 60s (1) and 70s (6). Our most recent 70s high was 74 in 2000. From 1979-2010, today is the average seventh hottest day of the year. Unlike the past few days, I can't say that the year following a hot year is a lot colder. The two references: in 2006, the high was 99. Then in 2007 the high was 91, only an eight degree drop. However, in 1995 the high was 95 and in 1996 it was only 75, a 20 degree drop. So we'll have to see what happens in future years with this.
In looking back through the years to the first July at O'Hare in 1959, the following instances were notable: In 1978 the low was a cool 52 degrees. In 1971 the low was a cold 49 degrees, a temperature colder than the official record low. In 1966 the high was 82 with a cool low of 52, a 30 degree spread. In 1965 the high was a cool 70 degrees.
More recently, there were large spreads of 35 degrees in 1984 (86/51) and 33 degrees in 1991 (92/59). There was a small spread of seven degrees in 1989 (75/68).
On the cool side, in 1990 the high was 70 with a low of 52. Five years earlier, in 1985, the high was 69 (our only 60s high) with a low of 62, a small seven degree spread. The record low of 51 was set in 1984. The record coolest high of 66 occurred back in 1912. The official thermometer was located near Lake Michigan at the time. 17 of the last 32 lows (53%) were in the 60s. Eight lows (25%) were in the cool 50s. Seven lows (22%) were in the warm 70s. Two years ago, in 2009, (high of 81, low of 58) was the coolest July 31st since 1997's high of 82 and low of 56.
The following astronomical data is provided by the United States Naval Observatory. In Crystal Lake, twilight begins at 5:13 and sunrise is at 5:45. Sunset is at 20:14 and twilight ends at 20:46. There's a total of 14 hours, 29 minutes of daylight today and 15 hours, 33 minutes between twilights. We lost two minutes of daylight from yesterday. Tomorrow twilight begins at 5:14 and sunrise is at 5:46. The moon is waxing crescent, having become new yesterday at 13:40. Illumination was 0% at midnight, will be 1% at noon and 3% at midnight tonight. Although you won't be able to see it, moonrise is at 6:51 this morning. Moonset is at 20:32 tonight. Moonrise is at 8:05 tomorrow morning. Moonlight time is 13 hours, 41 minutes which is 41 minutes shorter than yesterday.
Summer began June 4 and runs for 110 days through September 21. High temperatures in this period are usually in the 70s and 80s. Highs in the 60s, 90s and 100s occur infrequently. Labor Day is in 36 days.
Sunday, July 31, 2011
Saturday, July 30, 2011
July 30: ORD
Today is July 30th. It's the 211th day of the year. 154 days remain. It's week 31 of the year.
Unless noted, the following data is based upon observations collected by the National Weather Service, Chicago, at O'Hare International Airport (ORD) between November 1978 and last year. ORD has been the official site of record for Chicago since Thursday, January 17, 1980.
According to the National Climatic Data Center (NCDC), the normal high is 83 and the normal low is 64. I've calculated the 32-year averages at 83 and 64.
On the hot side, in 1999 the high was 101 (a degree short of the record) with a low of 78. In 2006 the high was 90 (our most recent 90s high) with a low of 77. In 1995 the high was 96 with a low of 70. In 1988 the high was 95 with a low of 70. The record high of 102 and record warmest low of 84 were set on the same hot day back in 1916. Our other 70s lows were 72 in 2008 (our most recent) and 70 in 2001. We had very high dew points in 1999. The top was 83 degrees, making 1999 perhaps the most humid July 30 on record. The dew point was at or above 80 degrees for 18 hours in 1999. 22 of the past 32 highs (69%) were in the: 70s (10) and 80s (12). Eight highs (25%) were in the hot: 90s (7) and 100s (1). Two highs (6%) were in the cool 60s. An interesting phenomenon is the drop in high temperature in the year following at minimum a 95 degree high. The three examples so far: 1988 (95) followed by 1989 (75), 20 degrees cooler; 1995 (96) followed by 1996 (75), 21 degrees cooler; 1999 (101) followed by 2000 (74), 27 degrees cooler.
In looking back through the years to the first July at O'Hare in 1959, the following instances were notable: In 1971 the high was 72 with a low of 53, a cool day. In 1965 the high was 82 with a cool low of 50, a 32 degree spread. That low of 50 is equal to the record low.
More recently, there were large spreads of 32 degrees in 1984 (82/50) and 31 degrees in 2003 (84/53). There were small spreads of five degrees in 1985 (69/64) and six degrees in 2000 (74/68).
On the cool side, in 1992 the high was 65 with a low of 58, a seven degree spread. In 1981 the high was 76 with a low of 53. The record low of 50 was set in 1984. Other cool highs were 69 in 1985 and 72 in 2004. The record coolest high of 62 occurred way back in 1895. The official thermometer was located near Lake Michigan at the time. 26 of the last 32 lows (81%) were in the: 50s (11) and 60s (15). Six lows were in the warm 70s.
The following astronomical data is provided by the United States Naval Observatory. In Crystal Lake, twilight begins at 5:12 and sunrise is at 5:44. Sunset is at 20:15 and twilight ends at 20:47. There's a total of 14 hours, 31 minutes of daylight today and 15 hours, 35 minutes between twilights. We lost two minutes of daylight from yesterday. Tomorrow twilight begins at 5:13 and sunrise is at 5:45. The moon is new today at 13:40. Illumination was 0% at midnight, will be 0% at noon and 0% at midnight tonight. Although you won't be able to see it, moonrise is at 5:38 this morning. Moonset is at 20:00 tonight. Moonrise is at 6:51 tomorrow morning. Moonlight time is 14 hours, 22 minutes which is 35 minutes shorter than yesterday.
Summer began June 4 and runs for 110 days through September 21. High temperatures in this period are usually in the 70s and 80s. Highs in the 60s, 90s and 100s occur infrequently. Labor Day is in 37 days.
Unless noted, the following data is based upon observations collected by the National Weather Service, Chicago, at O'Hare International Airport (ORD) between November 1978 and last year. ORD has been the official site of record for Chicago since Thursday, January 17, 1980.
According to the National Climatic Data Center (NCDC), the normal high is 83 and the normal low is 64. I've calculated the 32-year averages at 83 and 64.
On the hot side, in 1999 the high was 101 (a degree short of the record) with a low of 78. In 2006 the high was 90 (our most recent 90s high) with a low of 77. In 1995 the high was 96 with a low of 70. In 1988 the high was 95 with a low of 70. The record high of 102 and record warmest low of 84 were set on the same hot day back in 1916. Our other 70s lows were 72 in 2008 (our most recent) and 70 in 2001. We had very high dew points in 1999. The top was 83 degrees, making 1999 perhaps the most humid July 30 on record. The dew point was at or above 80 degrees for 18 hours in 1999. 22 of the past 32 highs (69%) were in the: 70s (10) and 80s (12). Eight highs (25%) were in the hot: 90s (7) and 100s (1). Two highs (6%) were in the cool 60s. An interesting phenomenon is the drop in high temperature in the year following at minimum a 95 degree high. The three examples so far: 1988 (95) followed by 1989 (75), 20 degrees cooler; 1995 (96) followed by 1996 (75), 21 degrees cooler; 1999 (101) followed by 2000 (74), 27 degrees cooler.
In looking back through the years to the first July at O'Hare in 1959, the following instances were notable: In 1971 the high was 72 with a low of 53, a cool day. In 1965 the high was 82 with a cool low of 50, a 32 degree spread. That low of 50 is equal to the record low.
More recently, there were large spreads of 32 degrees in 1984 (82/50) and 31 degrees in 2003 (84/53). There were small spreads of five degrees in 1985 (69/64) and six degrees in 2000 (74/68).
On the cool side, in 1992 the high was 65 with a low of 58, a seven degree spread. In 1981 the high was 76 with a low of 53. The record low of 50 was set in 1984. Other cool highs were 69 in 1985 and 72 in 2004. The record coolest high of 62 occurred way back in 1895. The official thermometer was located near Lake Michigan at the time. 26 of the last 32 lows (81%) were in the: 50s (11) and 60s (15). Six lows were in the warm 70s.
The following astronomical data is provided by the United States Naval Observatory. In Crystal Lake, twilight begins at 5:12 and sunrise is at 5:44. Sunset is at 20:15 and twilight ends at 20:47. There's a total of 14 hours, 31 minutes of daylight today and 15 hours, 35 minutes between twilights. We lost two minutes of daylight from yesterday. Tomorrow twilight begins at 5:13 and sunrise is at 5:45. The moon is new today at 13:40. Illumination was 0% at midnight, will be 0% at noon and 0% at midnight tonight. Although you won't be able to see it, moonrise is at 5:38 this morning. Moonset is at 20:00 tonight. Moonrise is at 6:51 tomorrow morning. Moonlight time is 14 hours, 22 minutes which is 35 minutes shorter than yesterday.
Summer began June 4 and runs for 110 days through September 21. High temperatures in this period are usually in the 70s and 80s. Highs in the 60s, 90s and 100s occur infrequently. Labor Day is in 37 days.
July 29: ORD
Today is July 29th. It's the 210th day of the year. 155 days remain. It's week 30 of the year.
Unless noted, the following data is based upon observations collected by the National Weather Service, Chicago, at O'Hare International Airport (ORD) between November 1978 and last year. ORD has been the official site of record for Chicago since Thursday, January 17, 1980.
According to the National Climatic Data Center (NCDC), the normal high is 84 and the normal low is 64. I've calculated the 32-year averages at 84 and 63.
On the hot side, in 1983 the high was 96 with a low of 72. In 2006 the high was 94 (our most recent 90s high) with a low of 74. In 1988 the high was 97 with a low of 70. In 1999 the high was 96 with a low of 69. In 1995 the high was 95 with a low of 69. The other 90s highs were 91 in 1987 and 90 in 2001. The record high of 99 was set back in 1913. The other 70s lows were 73 in 1990 and 71 in 2002. The record warmest low of 85 occurred back in 1916. We had very high dew points in 1999. The top was 82 degrees, making 1999 perhaps the most humid July 29 on record. 17 of the last 32 highs (53%) were in the 80s. Seven highs (22%) were in the hot 90s. Eight highs (25%) were in the cool 70s. Our most recent 70s high was 79 in 2000. There is an interesting phenomenon. In the year following a high of at least 95 degrees, the high is 16 or 17 degrees cooler. The four instances so far: 1983 (96) followed by 1984 (79), 17 degrees cooler; 1988 (97) followed by 1989 (81), 16 degrees cooler; 1995 (95) followed by 1996 (78), 17 degrees cooler; 1999 (96) followed by 2000 (79), 17 degrees cooler.
In looking back through the years to the first July at O'Hare in 1959, the following instances were notable: In 1971 the low was a cool 52 degrees. In 1965 the high was 80 with a cool low of 50, a 30 degree spread. That low of 50 equals the record low. In 1962 the high was a cool 71 with a low of 54, a cool day.
More recently, there were large spreads of 30 degrees in both 1979 (88/58) and 1994 (82/52).
On the cool side, in 1981 the high was 74 with a low of 51. Three years later, in 1984, the high was 79 with the record low of 50. Another cool low was 52 in 1994. Two other cool highs were 73 in 1992 and 74 in 1997. The record coolest high of 63 occurred way back in 1892. The official thermometer was located near Lake Michigan at the time. 19 of the last 32 lows (59%) were in the 60s. Eight lows (25%) were in the cool 50s. Our most recent 50s low was 54 in 2003. Five lows (16%) were in the warm 70s.
The following astronomical data is provided by the United States Naval Observatory. In Crystal Lake, twilight begins at 5:11 and sunrise is at 5:43. Sunset is at 20:16 and twilight ends at 20:48. There's a total of 14 hours, 33 minutes of daylight today and 15 hours, 37 minutes between twilights. We lost two minutes of daylight from yesterday. Tomorrow twilight begins at 5:12 and sunrise is at 5:44. The moon is waning crescent, heading towards new tomorrow at 13:40. Illumination was 3% at midnight, will be 1% at noon and 0% at midnight tonight. Although you won't be able to see it, moonrise is at 4:27 this morning. Moonset is at 19:24 tonight. Moonrise is at 5:38 tomorrow morning. Moonlight time is 14 hours, 57 minutes which is 25 minutes shorter than yesterday.
Summer began June 4 and runs for 110 days through September 21. High temperatures in this period are usually in the 70s and 80s. Highs in the 60s, 90s and 100s occur infrequently. Labor Day is in 38 days.
Unless noted, the following data is based upon observations collected by the National Weather Service, Chicago, at O'Hare International Airport (ORD) between November 1978 and last year. ORD has been the official site of record for Chicago since Thursday, January 17, 1980.
According to the National Climatic Data Center (NCDC), the normal high is 84 and the normal low is 64. I've calculated the 32-year averages at 84 and 63.
On the hot side, in 1983 the high was 96 with a low of 72. In 2006 the high was 94 (our most recent 90s high) with a low of 74. In 1988 the high was 97 with a low of 70. In 1999 the high was 96 with a low of 69. In 1995 the high was 95 with a low of 69. The other 90s highs were 91 in 1987 and 90 in 2001. The record high of 99 was set back in 1913. The other 70s lows were 73 in 1990 and 71 in 2002. The record warmest low of 85 occurred back in 1916. We had very high dew points in 1999. The top was 82 degrees, making 1999 perhaps the most humid July 29 on record. 17 of the last 32 highs (53%) were in the 80s. Seven highs (22%) were in the hot 90s. Eight highs (25%) were in the cool 70s. Our most recent 70s high was 79 in 2000. There is an interesting phenomenon. In the year following a high of at least 95 degrees, the high is 16 or 17 degrees cooler. The four instances so far: 1983 (96) followed by 1984 (79), 17 degrees cooler; 1988 (97) followed by 1989 (81), 16 degrees cooler; 1995 (95) followed by 1996 (78), 17 degrees cooler; 1999 (96) followed by 2000 (79), 17 degrees cooler.
In looking back through the years to the first July at O'Hare in 1959, the following instances were notable: In 1971 the low was a cool 52 degrees. In 1965 the high was 80 with a cool low of 50, a 30 degree spread. That low of 50 equals the record low. In 1962 the high was a cool 71 with a low of 54, a cool day.
More recently, there were large spreads of 30 degrees in both 1979 (88/58) and 1994 (82/52).
On the cool side, in 1981 the high was 74 with a low of 51. Three years later, in 1984, the high was 79 with the record low of 50. Another cool low was 52 in 1994. Two other cool highs were 73 in 1992 and 74 in 1997. The record coolest high of 63 occurred way back in 1892. The official thermometer was located near Lake Michigan at the time. 19 of the last 32 lows (59%) were in the 60s. Eight lows (25%) were in the cool 50s. Our most recent 50s low was 54 in 2003. Five lows (16%) were in the warm 70s.
The following astronomical data is provided by the United States Naval Observatory. In Crystal Lake, twilight begins at 5:11 and sunrise is at 5:43. Sunset is at 20:16 and twilight ends at 20:48. There's a total of 14 hours, 33 minutes of daylight today and 15 hours, 37 minutes between twilights. We lost two minutes of daylight from yesterday. Tomorrow twilight begins at 5:12 and sunrise is at 5:44. The moon is waning crescent, heading towards new tomorrow at 13:40. Illumination was 3% at midnight, will be 1% at noon and 0% at midnight tonight. Although you won't be able to see it, moonrise is at 4:27 this morning. Moonset is at 19:24 tonight. Moonrise is at 5:38 tomorrow morning. Moonlight time is 14 hours, 57 minutes which is 25 minutes shorter than yesterday.
Summer began June 4 and runs for 110 days through September 21. High temperatures in this period are usually in the 70s and 80s. Highs in the 60s, 90s and 100s occur infrequently. Labor Day is in 38 days.
Thursday, July 28, 2011
July 28: ORD
Today is July 28th. It's the 209th day of the year. 156 days remain. It's week 30 of the year.
Unless noted, the following data is based upon observations collected by the National Weather Service, Chicago, at O'Hare International Airport (ORD) between November 1978 and last year. ORD has been the official site of record for Chicago since Thursday, January 17, 1980.
According to the National Climatic Data Center (NCDC), the normal high is 84 and the normal low is 64. I've calculated the 32-year averages at 84 and 64.
On the hot side, in 1983 the high was the record high of 100 with a low of 78. In 1988 the high was 98 with a low of 70. The other 90s highs were 93 in 2006, 91 in 1999 and 90 in 1985. Another warm low was 74 in 2002. The record warmest low of 84 occurred back in 1916. 18 of the past 32 highs (56%) were in the 80s. Five highs (16%) were in the hot: 90s (4) and 100s (1). Nine highs (28%) were in the cool: 60s (1) and 70s (8). There was a 10 year sub-90 degree period that started in 1989 and went through 1998. Another interesting phenomenon is that the two instances of very hot highs were followed the next year by cool highs. In 1983 the high was 100, followed by a high of only 75 in 1984, 25 degrees cooler. In 1988 the high was 98 followed by a high of only 74 in 1989, 24 degrees cooler. There was such a contrast in between 1983 and 1984 that in 1984 the record low occurred, the year following the record high!
In looking back through the years to the first July at O'Hare in 1959, the following instances were notable: In 1973 the high was a cool 70 degrees. In 1962 the high was a cool 67 with a low of 63, a four degree spread.
More recently, there were no small spreads (diurnals of seven degrees or less) or large spreads (diurnals of 30 degrees or more).
On the cool side, in 1981 the high was the record coolest high of 66 with a low of 52. This (along with 1962's high of 67) were the only 60s highs at O'Hare. Three years later, in 1984, the high was 75 with the record low of 51. Another cool low was 53 in 2005. 25 of the last 32 lows (78%) were in the: 50s (11) and 60s (14). Seven lows (22%) were in the warm 70s.
The following astronomical data is provided by the United States Naval Observatory. In Crystal Lake, twilight begins at 5:10 and sunrise is at 5:42. Sunset is at 20:17 and twilight ends at 20:49. There's a total of 14 hours, 35 minutes of daylight today and 15 hours, 39 minutes between twilights. We lost two minutes of daylight from yesterday. Tomorrow twilight begins at 5:11 and sunrise is at 5:43. The moon is waning crescent, heading towards new in two days. Illumination was 8% at midnight, will be 5% at noon and 3% at midnight tonight. Moonrise is at 3:21 this morning. Moonset is at 18:43 this afternoon. Moonrise is at 4:27 tomorrow morning. Moonlight time is 15 hours, 22 minutes which is 13 minutes shorter than yesterday.
Summer began June 4 and runs for 110 days through September 21. High temperatures in this period are usually in the 70s and 80s. Highs in the 60s, 90s and 100s occur infrequently. Labor Day is in 39 days.
Unless noted, the following data is based upon observations collected by the National Weather Service, Chicago, at O'Hare International Airport (ORD) between November 1978 and last year. ORD has been the official site of record for Chicago since Thursday, January 17, 1980.
According to the National Climatic Data Center (NCDC), the normal high is 84 and the normal low is 64. I've calculated the 32-year averages at 84 and 64.
On the hot side, in 1983 the high was the record high of 100 with a low of 78. In 1988 the high was 98 with a low of 70. The other 90s highs were 93 in 2006, 91 in 1999 and 90 in 1985. Another warm low was 74 in 2002. The record warmest low of 84 occurred back in 1916. 18 of the past 32 highs (56%) were in the 80s. Five highs (16%) were in the hot: 90s (4) and 100s (1). Nine highs (28%) were in the cool: 60s (1) and 70s (8). There was a 10 year sub-90 degree period that started in 1989 and went through 1998. Another interesting phenomenon is that the two instances of very hot highs were followed the next year by cool highs. In 1983 the high was 100, followed by a high of only 75 in 1984, 25 degrees cooler. In 1988 the high was 98 followed by a high of only 74 in 1989, 24 degrees cooler. There was such a contrast in between 1983 and 1984 that in 1984 the record low occurred, the year following the record high!
In looking back through the years to the first July at O'Hare in 1959, the following instances were notable: In 1973 the high was a cool 70 degrees. In 1962 the high was a cool 67 with a low of 63, a four degree spread.
More recently, there were no small spreads (diurnals of seven degrees or less) or large spreads (diurnals of 30 degrees or more).
On the cool side, in 1981 the high was the record coolest high of 66 with a low of 52. This (along with 1962's high of 67) were the only 60s highs at O'Hare. Three years later, in 1984, the high was 75 with the record low of 51. Another cool low was 53 in 2005. 25 of the last 32 lows (78%) were in the: 50s (11) and 60s (14). Seven lows (22%) were in the warm 70s.
The following astronomical data is provided by the United States Naval Observatory. In Crystal Lake, twilight begins at 5:10 and sunrise is at 5:42. Sunset is at 20:17 and twilight ends at 20:49. There's a total of 14 hours, 35 minutes of daylight today and 15 hours, 39 minutes between twilights. We lost two minutes of daylight from yesterday. Tomorrow twilight begins at 5:11 and sunrise is at 5:43. The moon is waning crescent, heading towards new in two days. Illumination was 8% at midnight, will be 5% at noon and 3% at midnight tonight. Moonrise is at 3:21 this morning. Moonset is at 18:43 this afternoon. Moonrise is at 4:27 tomorrow morning. Moonlight time is 15 hours, 22 minutes which is 13 minutes shorter than yesterday.
Summer began June 4 and runs for 110 days through September 21. High temperatures in this period are usually in the 70s and 80s. Highs in the 60s, 90s and 100s occur infrequently. Labor Day is in 39 days.
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