Monday, November 23, 2009

November 17: ORD

Today is November 17th. It's the 321st day of the year. 44 days remain. It's week 46 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 46 and the normal low is 31. I've calculated the 31-year averages at 48 and 30.


On the warm side, in 2004 the high was 63 with a low of 54. In 1979 the high was 69 with a low of 41. In 2001 the high was 66 with a low of 38. Another warm high was 64 in 1987.
The record high of 74 was set in 1975. The record warmest low of 60 occurred in 1952. Over the last 31 years, 20 highs have been: 40s (11) and 50s (9). Four highs were in the warmer 60s. Seven highs were in the cooler: 20s (1) and 30s (6).

In looking back through the years to the first November at O'Hare in 1958, the following instances were notable: in 1975 the high was 69 with a low of 49, a warm day and year of the record high. In 1972 the high was 36 with a low of 31, a five degree spread. In 1971 the high was 71 with a low of 50, a warm day. In 1969 the high was 51 with a low of 46, a mere five degree spread. In 1968 the high was 42 with a low of 39, a mere three degree spread. In 1966 the high was 66 with a low of 45, a warm day. In 1963 the high was 69 with a low of 45, a warm day. In 1961 the high was 36 with a low of 31, a mere five degree spread. In 1959 the high was 13 with a low of 2, a cold day and year of both the record low and record coolest highs.
In 1958 the high was 71 with a low of 54, a warm day.

More recently, there were
no large spreads. There were small spreads of five degrees in 2000 (32/27), six degrees in 1995 (38/32) and six degrees in 2006 (40/34).

On the cool side, in 2005 the high was 28 with a low of 15. In 1989 the high was 34 with a low of 15. In 1997 the high was 34 with a low of 17. Another cool low was 32 in 2000. The record low of 3 and record coolest high of 14 were set on the same cold day in 1959. 26 of the last 31 lows were: 20s (10) and 30s (16). Three lows were in the cooler 10s. Two lows were in the warmer: 40s (1) and 50s (1).

The following astronomical data is provided by the United States Naval Observatory. In Crystal Lake, twilight begins at 6:xx and sunrise is at 6:xx. Sunset is at 16:xx and twilight ends at 17:xx. Tomorrow twilight begins at 6:xx and sunrise is at 6:xx. There's a total of 10 hours, x minutes of daylight today (xxxx minutes less than yesterday) and 11 hours, x minutes between twilights. The moon is xxxxxxxx, heading towards xxxxx xxxxxx tomorrow. Illumination was xx% at midnight, will be xx% at noon and xx% at midnight tonight. Moonset is at 12:16. Moonrise is at 22:30. Moonlight time is xx hours, xx minutes which is xx minutes shorter than yesterday.

Thanksgiving is in nine days. -Bernie-

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