Historical Climate Data

Precipitation Summary

Station: 112348 DIXON 1 NW, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.60 1.43 2.55 3.61 4.32 4.88 3.45 4.47 3.31 2.71 2.82 2.13 37.28

Precipitation Extremes

Period of Record: 1893-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 4.04 1974 0.04 1894 1.87 01-24-1938
Feb 3.69 2001 0.00 1969 1.79 02-20-1994
Mar 5.57 1920 0.20 1910 2.22 03-05-1976
Apr 8.78 1973 0.34 1901 2.64 04-17-2006
May 11.20 1996 0.48 1934 4.88 05-17-1974
Jun 11.36 1993 0.25 1988 4.69 06-26-1978
Jul 10.34 1915 0.15 1894 5.08 07-10-1922
Aug 12.43 1987 0.30 2003 4.10 08-11-1916
Sep 11.65 1970 0.04 1979 4.95 09-01-1989
Oct 9.48 1954 0.04 1952 4.67 10-11-1931
Nov 7.54 1935 0.03 1904 2.90 11-03-1935
Dec 4.79 1971 0.21 1962 3.12 12-10-2003
             
Annual 47.53 1965 18.49 1894 5.08 07-10-1922
Winter 9.72 1974 1.20 1923 3.12 12-10-2003
Spring 20.38 1973 2.59 1934 4.88 05-17-1974
Summer 22.10 1993 3.55 1988 5.08 07-10-1922
Fall 19.90 1941 2.89 1956 4.95 09-01-1989

Precipitation Threshold Climatology

Derived from 1971-2000 Averages:

*Annual/seasonal totals may differ from the sum of the monthly totals due to rounding.


Month 		# Days
Total ≥ 0.01" 		# Days
Total ≥ 0.10" 		# Days
Total ≥ 0.50" 		# Days
Total ≥ 1.00"
Jan 7.7 4.2 0.8 0.2
Feb 6.1 3.8 0.9 0.2
Mar 8.5 5.7 1.6 0.5
Apr 10.3 6.9 2.5 0.9
May 10.2 7.4 2.9 1.1
Jun 9.1 7.3 3.2 1.3
Jul 8.3 5.9 2.2 0.9
Aug 9.2 6.5 2.9 1.4
Sep 7.9 5.3 2.3 0.7
Oct 8.0 5.3 1.8 0.6
Nov 8.6 5.7 2.1 0.5
Dec 8.2 4.9 1.1 0.4
         
Annual 102.1 68.9 24.3 8.7
Winter 22.0 12.9 2.8 0.8
Spring 29.0 19.9 7.0 2.5
Summer 26.7 19.7 8.4 3.6
Fall 24.5 16.4 6.2 1.8

Temperature Summary

Station 112348 DIXON 1 NW, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 26.0 31.7 44.2 58.0 69.7 78.8 82.0 80.3 73.3 61.8 45.4 31.4 56.9
Low °F 9.5 15.0 26.7 37.4 48.5 58.0 62.3 60.0 51.2 39.4 28.4 16.5 37.7
Mean °F 17.8 23.4 35.5 47.7 59.1 68.4 72.2 70.2 62.3 50.6 36.9 24.0 47.3
HDD 1465 1166 916 522 240 37 11 38 134 452 844 1274 7099
CDD 0 0 0 3 58 138 234 197 52 6 0 0 688

HDD - heating degree days (base 65F); CDD - cooling degree days (base 65F)

Temperature Extremes

Period of Record: 1893-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 34.5 1933 6.0 1912 65 01-03-2004 -27 01-21-1985
Feb 37.1 1954 10.4 1936 71 02-26-2000 -27 02-13-1905
Mar 49.0 1945 23.4 1960 87 03-30-1986 -13 03-04-2002
Apr 57.3 1915 39.7 1907 93 04-26-1986 8 04-07-1982
May 68.2 1934 51.6 1907 105 05-31-1934 24 05-03-2005
Jun 77.6 1934 62.7 1916 106 06-01-1934 34 06-06-1894
Jul 81.0 1901 66.4 1996 110 07-14-1936 43 07-23-1904
Aug 80.7 1947 64.6 1915 103 08-03-1930 37 08-29-1934
Sep 71.9 1931 56.1 1918 102 09-07-1939 22 09-28-1942
Oct 63.6 1963 41.7 1917 95 10-01-1897 7 10-28-1925
Nov 47.9 1931 28.7 1996 81 11-01-1933 -8 11-24-1950
Dec 35.9 1923 12.7 2000 68 12-03-1970 -25 12-28-1924
                 
Annual 54.7 1896 44.0 1917 110 07-14-1936 -27 01-21-1985
Winter 33.6 1932 13.6 1979 71 02-26-1900 -27 01-21-1985
Spring 55.3 1977 43.0 1996 105 05-31-1934 -13 03-04-1902
Summer 76.0 1901 65.9 1915 110 07-14-1936 34 06-06-1994
Fall 59.3 1931 45.9 1996 102 09-07-1939 -8 11-24-1950

Temperature Threshold Climatology

Derived from 1971-2000 Averages:

*Annual/seasonal values may differ from the sum of the monthly values due to rounding.


Month 		# Days
High ≥ 90°F 		# Days
High ≤ 32°F 		# Days
Low ≤ 32°F 		# Days
Low ≤ 0°F
Jan 0.0 19.4 30.2 8.8
Feb 0.0 12.5 25.9 5.0
Mar 0.0 4.2 22.2 0.3
Apr 0.1 0.3 8.7 0.0
May 1.0 0.0 0.6 0.0
Jun 3.2 0.0 0.0 0.0
Jul 6.2 0.0 0.0 0.0
Aug 4.3 0.0 0.0 0.0
Sep 1.9 0.0 0.5 0.0
Oct 0.1 0.0 7.7 0.0
Nov 0.0 3.0 20.1 0.1
Dec 0.0 13.3 28.7 4.4
         
Annual 16.9 53.0 145.2 18.8
Winter 0.0 45.2 84.8 18.2
Spring 1.1 4.5 31.6 0.3
Summer 13.8 0.0 0.0 0.0
Fall 1.9 3.1 28.6 0.1

Snowfall Summary

Station: 112348 DIXON 1 NW, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 11.5 7.0 4.4 1.1 0.0 0.0 0.0 0.0 0.0 0.1 2.1 9.4 35.6

Snowfall Extremes

Period of Record: 1893-2006

Month High (in) Year 1-Day Max (in) Date
Jan 46.5 1979 12.1 01-01-1979
Feb 23.3 1994 14.0 02-07-1933
Mar 26.5 1926 13.0 03-31-1926
Apr 15.5 1926 8.0 04-18-1912
May 0.8 1966 0.8 05-11-1966
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 5.4 1967 5.4 10-27-1967
Nov 16.5 1947 8.1 11-18-1926
Dec 30.3 2000 10.2 12-23-1969
Season (Jul-Jun) 92.9 1978-1979 14.0 02-07-1933

Snowfall Threshold Climatology

Derived from 1971-2000 Averages

*Annual values may differ from the sum of the monthly values due to rounding.


Month 		# Days
Total ≥ 0.1" 		# Days
Total ≥ 1.0" 		# Days
Total ≥ 2.0" 		# Days
Total ≥ 5.0"
Jan 3.8 2.6 1.6 0.2
Feb 3.8 2.6 1.6 0.2
Mar 2.2 1.5 0.8 0.2
Apr 0.4 0.4 0.2 0.0
May 0.0 0.0 0.0 0.0
Jun 0.0 0.0 0.0 0.0
Jul 0.0 0.0 0.0 0.0
Aug 0.0 0.0 0.0 0.0
Sep 0.0 0.0 0.0 0.0
Oct 0.0 0.0 0.0 0.0
Nov 1.2 0.7 0.4 0.1
Dec 4.5 3.0 2.0 0.3
Annual 17.9 11.9 7.0 1.3

Growing Season Summary

Station: 112348 DIXON 1 NW, IL

Growing Degree Day Averages

Derived from 1971-2000 Data

Base Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
40 2 12 87 293 630 880 1032 966 693 369 93 12 5036
45 0 3 46 181 477 731 877 811 545 242 45 5 3941
50 0 0 22 98 333 582 722 656 400 143 20 2 2964
55 0 0 9 48 209 434 567 501 265 74 7 0 2106
60 0 0 3 21 115 291 413 348 157 30 1 0 1376
50** 1 8 57 179 384 576 699 640 433 228 54 7 3247

**Modified Growing Degree Days: Base 50, Ceiling 86.

Growing Season Summary

Derived from 1971-2000 Averages

Date of Last Spring Occurrence Date of First Fall Occurrence
Temp °F Median Early 90% 10% Late Median Early 90% 10% Late
32 4/28 3/28 4/10 5/13 5/28 10/10 9/22 9/24 10/20 11/03
30 4/18 3/28 4/04 5/08 5/16 10/13 9/22 10/02 10/29 11/04
28 4/13 3/26 4/01 5/03 5/16 10/19 9/30 10/04 11/10 11/16
24 4/06 3/23 3/25 4/14 4/22 11/03 10/20 10/23 11/18 11/20
20 3/27 2/22 3/14 4/10 4/18 11/10 10/20 10/27 11/27 12/08
16 3/14 2/18 2/22 4/07 4/09 11/24 11/02 11/08 12/11 12/22

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 161 137 143 188 200
30 175 144 155 203 207
28 187 161 166 210 222
24 213 194 197 231 238
20 227 194 207 250 260
16 253 219 229 283 287

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Copyright 2007 Illinois State Water Survey
Jim Angel, State Climatologist, jimangel@illinois.edu
Last Modified: September 11, 2007