Today is December 16th. It's the 350th day of the year. 15 days remain. It's week 50 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 34 and the normal low is 20. I've calculated the 31-year averages at 35 and 21.
On the warm side, in 1984 the high was the record high of 60 with a low of 37. Three years ago the high was 55 with a low of 32. In 2001 the high was 45 with a low of 39, a six degree spread. In 1997 the high was 45 with a low of 32. Other warm lows were 35 in 1986, 34 in 1994, 33 in 1990, 33 in 1993 and 32 in 1998. The record warmest low of 43 was set back in 1928. Over the last 31 years, 21 highs were in the: 30s (13) and 40s (8). Two highs were in the warmer: 50s (1) and 60s (1). Eight highs were in the cooler: 0s (aka single digits)(1), 10s (aka teens)(1) and 20s (6).
In looking back through the years to the first December at O'Hare in 1958, the following instances were notable: in 1977 the high was a warm 54 with a low of 30, a warm day. In 1974 the high was 36 with a low of 30, a six degree spread. In 1972 the high was 9 with a low of -2, a cold day. In 1971 the high was 39 with a low of 33, a six degree spread. In 1970 the high was 39 with a low of 36, a mere three degree spread. In 1966 the high was 34 with a low of 32, a mere two degree spread. In 1965 the high was 30 with a low of 24, a six degree spread. In 1963 the high was 15 with a low of -6, a cold day. In 1959 the high was 51 with a low of 35, a warm day. In 1958 the high was 36 with a cold low of 0, a 36 degree spread.
More recently, there was a large spread of 32 degrees in 1979 (37/5). There were small spreads of three degrees in 1980 (33/30), three degrees in 1990 (36/33), three degrees in 2002 (33/30), five degrees in 1986 (40/35), five degrees in 1994 (39/34), six degrees in 1996 (32/26), six degrees in 2005 (24/18) and seven degrees in 1993 (40/33).
On the cold side, in 1989 the high was 9 with a low of -5. A year earlier, in 1988, the high was 17 with a low of 4. In 1985 the high was 23 with a low of 3. In 1983 the high was 23 with a low of 3. Last year the high was 22 with a low of 6. In 1981 the high was 22 with a low of 9. Other cold lows were 5 in 1979 and 6 in 1991. The record low of -12 and record coolest high of 2 were set on the same day back in 1951. 19 of the last 31 lows were: 20s (7) and 30s (12). Twelve lows were in the cooler: negative 0s (1), 0s (aka single digits)(7) and 10s (aka teens)(4).
In 1973, O'Hare had 4.5 inches of snow today. This was the fourth day of a string of days through the 20th which produced 17.6 inches, or 94% of the month's total of 18.8 inches.
The following astronomical data is provided by the United States Naval Observatory. In Crystal Lake, twilight begins at 6:44 and sunrise is at 7:16. Sunset is at 16:22 and twilight ends at 16:54. Chicago's sunset is at 16:21 and twilight ends at 16:53. Tomorrow twilight begins at 6:45 and sunrise is at 7:17. There's a total of 9 hours, 6 minutes of daylight today and 10 hours, 10 minutes between twilights. The moon is new today at 6:02. Illumination was 0% at midnight, will be 0% at noon and 1% at midnight tonight. Moonrise is at 7:36 this morning. Moonset is at 16:28. Moonrise is at 8:21 tomorrow morning. Moonlight time is 8 hours, 52 minutes which is two minutes longer than yesterday.
Christmas Eve is in eight days and Christmas Day is in nine days. New Year's Eve is in 15 days and New Year's Day is in 16 days. -Bernie-
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 34 and the normal low is 20. I've calculated the 31-year averages at 35 and 21.
On the warm side, in 1984 the high was the record high of 60 with a low of 37. Three years ago the high was 55 with a low of 32. In 2001 the high was 45 with a low of 39, a six degree spread. In 1997 the high was 45 with a low of 32. Other warm lows were 35 in 1986, 34 in 1994, 33 in 1990, 33 in 1993 and 32 in 1998. The record warmest low of 43 was set back in 1928. Over the last 31 years, 21 highs were in the: 30s (13) and 40s (8). Two highs were in the warmer: 50s (1) and 60s (1). Eight highs were in the cooler: 0s (aka single digits)(1), 10s (aka teens)(1) and 20s (6).
In looking back through the years to the first December at O'Hare in 1958, the following instances were notable: in 1977 the high was a warm 54 with a low of 30, a warm day. In 1974 the high was 36 with a low of 30, a six degree spread. In 1972 the high was 9 with a low of -2, a cold day. In 1971 the high was 39 with a low of 33, a six degree spread. In 1970 the high was 39 with a low of 36, a mere three degree spread. In 1966 the high was 34 with a low of 32, a mere two degree spread. In 1965 the high was 30 with a low of 24, a six degree spread. In 1963 the high was 15 with a low of -6, a cold day. In 1959 the high was 51 with a low of 35, a warm day. In 1958 the high was 36 with a cold low of 0, a 36 degree spread.
More recently, there was a large spread of 32 degrees in 1979 (37/5). There were small spreads of three degrees in 1980 (33/30), three degrees in 1990 (36/33), three degrees in 2002 (33/30), five degrees in 1986 (40/35), five degrees in 1994 (39/34), six degrees in 1996 (32/26), six degrees in 2005 (24/18) and seven degrees in 1993 (40/33).
On the cold side, in 1989 the high was 9 with a low of -5. A year earlier, in 1988, the high was 17 with a low of 4. In 1985 the high was 23 with a low of 3. In 1983 the high was 23 with a low of 3. Last year the high was 22 with a low of 6. In 1981 the high was 22 with a low of 9. Other cold lows were 5 in 1979 and 6 in 1991. The record low of -12 and record coolest high of 2 were set on the same day back in 1951. 19 of the last 31 lows were: 20s (7) and 30s (12). Twelve lows were in the cooler: negative 0s (1), 0s (aka single digits)(7) and 10s (aka teens)(4).
In 1973, O'Hare had 4.5 inches of snow today. This was the fourth day of a string of days through the 20th which produced 17.6 inches, or 94% of the month's total of 18.8 inches.
The following astronomical data is provided by the United States Naval Observatory. In Crystal Lake, twilight begins at 6:44 and sunrise is at 7:16. Sunset is at 16:22 and twilight ends at 16:54. Chicago's sunset is at 16:21 and twilight ends at 16:53. Tomorrow twilight begins at 6:45 and sunrise is at 7:17. There's a total of 9 hours, 6 minutes of daylight today and 10 hours, 10 minutes between twilights. The moon is new today at 6:02. Illumination was 0% at midnight, will be 0% at noon and 1% at midnight tonight. Moonrise is at 7:36 this morning. Moonset is at 16:28. Moonrise is at 8:21 tomorrow morning. Moonlight time is 8 hours, 52 minutes which is two minutes longer than yesterday.
Christmas Eve is in eight days and Christmas Day is in nine days. New Year's Eve is in 15 days and New Year's Day is in 16 days. -Bernie-
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