Today is November 20th. It's the 325th day of the year. 41 days remain. It's week 47 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. Before
this, the official site was on the
south side of Chicago at Midway
International Airport (MDW), beginning on Wednesday,
July 1, 1942. From
Friday, January 1, 1926 through Tuesday, June 30, 1942, the
official site was at the University of Chicago. Before that, the
official site was at various locations in Chicago going back to Monday,
October 16, 1871. Observations taken from October 15, 1870 to
October 8, 1871
were lost in the Great Chicago Fire.
According
to the National Climatic Data Center (NCDC), the normal high is 46
and the normal low is 31. I've calculated the 34-year averages at 47
and 31.
On
the warm side, in 1982 (O'Hare's warmest November 20th) the high was 66 (O'Hare's warmest high of the date) with a low of 42. A decade
later, in 1992, the high was 63 with a low of 40. Two years later, in
1994, the high was 59 with a low of 44 (with 1963, O'Hare's second warmest low of the date). 1992 and 1994 are O'Hare's second warmest November 20ths. In 2007 the high was 55 with a
low of 45 (O'Hare's warmest low of the date). In 2003 the high was 65 (O'Hare's second warmest high of the date) with a
low of 34, a 31 degree spread. The other warm highs were 60 degrees in 1975, 60 degrees in 1977, 60 degrees in 1979 and
58 degrees in: 1983 and the back-to-back years of 1989 and 1990. The other
warm lows were 44 degrees in 1963 (with 1994, O'Hare's second warmest low of the date) and 43 degrees in 2004. The record high of 68 degrees was originally set back in 1913 adjacent to Lake Michigan
and then again in 1930 at the University of Chicago. The record warmest low of 62 degrees occurred back in
1913 adjacent to Lake Michigan. 28 of the past
34 highs (82%) were in the: 30s (8), 40s (10) and 50s (10). Four highs were in
the warm 60s. Two highs were in the cold 20s. The other warm 11/20 day was in 1973 as the high was 58 with a low of 42.
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 a warm
60 degrees. In 1975 the high was a warm 60 degrees. In 1973 the high
was a warm 58 with a low of 42, a warm day. In 1969 the high was 28
with a low of 15, a cold day. In 1968 the high was a cold 30 degrees
with a low of 22, a cold day. In 1967 the high was a cold 34 with a
low of 32, a mere two degree spread. In 1964 the high was 32 with a low
of 13, a cold day. In 1963 low was a warm 44 degrees.
More recently, there were no other large
spreads. There were small spreads of four degrees in 1986 (37/33),
seven degrees in 1978 (32/25), and seven degrees in 1998 (34/27).
On the cool side,
in 1985 (O'Hare's second coolest November 20th) the high was 27 with a low of 17 (O'Hare's third coldest low of the date). In 2000 the high was 29
(O'Hare's third coolest high of the date) with a low of 18 (tied with 1984 as O'Hare's fourth coldest low of the date). The other cool highs were 32 degrees in 1978, 33
degrees in 1987, 34 degrees in 1967, 34 degrees in 1996 and 34 degrees in 1998. The other cold low, as just mentioned, was 18 degrees in 1984. Note that back-to-back 10s (a.k.a. teens) lows occurred in 1984 and 1985. The record low of 8 degrees was set way back in 1873. The record coolest high of 20 degrees occurred way back in 1887. Both records occurred at a time when the official readings were taken adjacent to Lake Michigan. 24 of the
last 34 lows (71%) were in the: 20s (12) and 30s (12). Six consecutive
20s and 30s lows occurred from 1986 through 1991. Three lows (9%)
were in the cold 10s (a.k.a. teens). Seven lows (20%) were in the warm 40s. O'Hare's coolest November 20th was in 1969 as the high was 28 (O'Hare's second coolest high of the date) with a low of 15 (O'Hare's second coldest low of the date). The other cool 11/20 days were in: 1964 (high of 32, low of 13 (O'Hare's coldest low of the date)) and 1968 (high of 30, low of 22).
The
following astronomical data is provided by the United States Naval
Observatory. In Crystal Lake, twilight begins at 6:20 and sunrise is at
6:51. Sunset is at 16:27 and twilight ends at 16:58. There's a total of
9 hours, 36 minutes of daylight today and 10 hours, 38 minutes between
twilights. We lost three minutes of daylight from yesterday. Tomorrow
twilight begins at 6:21 and sunrise is at 6:52. The moon reaches first quarter today at 8:31. Illumination was 46% at midnight, will be 52% at noon and 57%
at midnight tonight. Moonrise is at 12:20 this afternoon. Moonset is at 0:03 tomorrow. Moonrise is at 12:48 tomorrow afternoon. Moonlight time is
11 hours, 40 minutes which is 31 minutes longer than yesterday.
Cool
Fall began on November 2nd and runs for 29 days through November 30th.
High temperatures in this period are usually in the 30s, 40s and 50s.
Highs in the 20s, 60s and 70s occur infrequently. Thanksgiving is in two days. Pearl Harbor Day is in 17 days.
Monday, November 26, 2012
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