February 6: ORD

Today is February 6th. It's the 37th day of the year. 328 days remain. It's week 6 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. Observations have been official at O'Hare since Thursday, January 17, 1980.

According to the National Climatic Data Center (NCDC), the normal high is 32 and the normal low is 17. I've calculated the 32-year averages at 30 and 16.

On the warm side, in 2005 the high was 47 with a low of 39. In 1999 the high was 46 with a low of 33. In 1990 the high was 46 with a low of 30. Three years earlier, in 1987, the high was 48 with a low of 26. In 1998 the high was 42 with a low of 29. Other warm lows were 32 in 1991 and 29 in 1992. The record high of 57 was set way back in 1882 and the record warmest low of 42 was set way back in 1904. 14 of the last 32 highs (44%) were in the 30s. On the warmer side, seven highs (22%) were in the 40s. On the cold side, 11 highs (34%) were in the: single digits (3), 10s (a.k.a. teens) (4) and 20s (4). The most recent high in the 20s was 28 in 1997.

In looking back through the years to the first February at O'Hare in 1959, the following instances were notable: in 1978 the high was 17 with a low of 2, a cold day. In 1977 the high was 15 with a low of -7, a cold day. In 1976 the high was a cold 17 with a low of 11, a six degree spread. In 1975 the low was a cold 4 above zero. In 1974 the high was 27 with a low of 22, a five degree spread. In 1973 the high was 42 with a warm low of 31, a warm day. In 1972 the low was a cold 2 degrees above zero. In 1970 the high was 39 with a warm low of 33, a six degree spread. In 1969 the high was 31 with a warm low of 30, a tiny one degree spread. In 1968 the high was a warm 46 with a low of 26, a warm day. In 1967 the high was a cold 20 with a low of 16, a four degree spread. In 1965 the high was 49 with a low of 38, a warm day. In 1964 the high was 53 with a low of 30, a warm day. In 1963 the high was a warm 46 with a low of 27, a warm day. In 1962 the high was 7 with a low of -5, a cold day. In 1960 the high was 33 with a warm low of 30, a three degree spread. In 1959 the high was 25 with a cold low of -4, a cold day.

More recently, there were small spreads of four degrees in 1997 (28/24), four degrees in 2004 (30/26), five degrees in 1991 (37/32), six degrees in 1993 (32/26) and six degrees last year (31/25). There were large spreads of 33 degrees in 1996 (34/1) and 34 degrees two years ago (42/8).

On the cold side, in 1982 the high was the record coldest high of 4 with the record low of -14. In 1989 the high was 8 with a low of -4. In 2007 the high was 10 with a low of -5. In 1988 the high was 8 with a low of -2. Four years before, in 1984, the high was 12 with a low of 3. A year later, in 1985, the high was 19 with a low of -1. A decade after that, in 1995, the high was 19 with a low of 3. In 1979 the high was 25 with a low of -3. Except for the recent low of -5 in 2007, the lows below zero occurred between 1979 and 1989. Another cold low was 1 in 1996. 18 of the last 32 lows (56%) were in the: 10s (a.k.a. teens) (6) and 20s (12). Even colder, ten lows (31%) were in the: single digits (4), negative single digits (5) and negative 10s (a.k.a. negative teens) (1). On the warmer side, four lows (13%) were in the 30s.

Today is not a major day in Chicago's snow history but it was in Rockford! Back in 1911, 11.5 inches fell. On the temperature front, the National Weather Service/Chicago reports that January 2009 was just the tenth January (in 137 years of record-keeping) that no temperature reached 40 degrees. The last time this happened was in 1985. This also occurred in 1982, 1979, 1977, 1976, 1920, 1918, 1912 and 1904. January 1977 was a bit worse, since the temperatures that year never got to the freezing mark (32 degrees).

The following astronomical data is provided by the United States Naval Observatory. In Crystal Lake, twilight begins at 6:32 and sunrise is at 7:01. Sunset is at 17:14 and twilight ends at 17:43. There's a total of 10 hours, 13 minutes of daylight today and 11 hours, 11 minutes between twilights. We gained three minutes of daylight from yesterday. Tomorrow twilight begins at 6:31 and sunrise is at 7:00. The moon is waxing crescent. Illumination was 9% at midnight, will be 12% at noon and 15% at midnight tonight. Moonrise is at 8:14 this morning. Moonset is at 21:05 tonight. Moonrise is at 8:36 tomorrow morning. Moonlight time is 12 hours, 51 minutes which is 37 minutes longer than yesterday.

Lincoln's Birthday is in six days. Valentine's Day is in eight days. Susan B. Anthony Day is in nine days. -Bernie-