Friday, November 6, 2009

November 6: ORD

Today is November 6th. It's the 310th day of the year. 55 days remain. It's week 45 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 52 and the normal low is 35. I've calculated the 31-year averages at 51 and 34.


On the warm side, last year the high was 65 with a low of 45. Other warm highs were 68 in 1980 and 65 in 2004. The record high of 75 was set in 1975. The record warmest low of 63 occurred in 1924.
21 of the last 31 highs have been: 40s (10) and 50s (11). Six highs were in the warmer 60s. Four highs were in the cooler 30s.

In looking back through the years to the first November at O'Hare in 1958, the following instances were notable: in 1977 the high was 59 with a low of 52, a spread of seven degrees and a warm day. In 1975 the high was 75 with a low of 57, a warm day and year of the record high. In 1973 the high was 41 with a low of 20, a cool day. In 1969 the high was 60 with a low of 30, a 30 degree spread. In 1968 the high was 48 with a low of 45, a three degree spread. In 1965 the high was 64 with a low of 55, a warm day. In 1961 the high was a warm 40 with a low of 23, a cool day. In 1959 the high was 30 with a low of 24, a six degree spread and cool day.


More recently, there was a
large spread of 40 degrees in 1980 (68/28). There were small spreads of four degrees in 1997 (47/43), six degrees in 1992 (37/31), seven degrees in 1989 (49/42) and seven degrees in 2002 (43/36).

On the cool side, in 1993 the high was 32 with a low of 20. A couple of years earlier, in 1991, the high was 36 with the record low of 19. Another cool low was 23 in 1984. Other cool highs were 36 in 1988 and 37 in 1992. The record coolest high of 33 was set in 1930. 17 of the last 31 lows were 30s. Six lows were in the cooler: 10s (1) and 20s (5). Eight lows were in the warmer 40s.

The following astronomical data is provided by the United States Naval Observatory. In Crystal Lake, twilight begins at 6:03 and sunrise is at 6:33. Sunset is at 16:41 and twilight ends at 17:10. Chicago's sunset is at 16:39 and twilight ends at 17:08. Tomorrow twilight begins at 6:05 and sunrise is at 6:34. There's a total of 10 hours, 8 minutes of daylight today (two minutes less than yesterday) and 11 hours, 7 minutes between twilights. The moon is waning gibbous, heading towards last quarter in three days. Illumination was 85% at midnight, will be 83% at 6:00, 81% at noon, 79% at 18:00 and 76% at midnight tonight. Moonset is at 10:52. Moonrise is at 20:00. Moonlight time is 14 hours, 52 minutes which is 12 minutes shorter than yesterday. Moonlight time is near it's peak today.

Veterans Day is in five days. My sister-in-law, Sharon, celebrates a birthday in eight days. -Bernie-

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