Historical Climate Data

Precipitation Summary

Station: 110187 ANNA 2 NNE, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 3.59 3.42 4.73 4.70 5.22 4.23 3.26 3.58 3.13 3.38 4.76 4.30 48.30

Precipitation Extremes

Period of Record: 1887-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 16.55 1950 0.00 1888 6.70 01-22-1999
Feb 8.59 1989 0.28 1947 4.04 02-26-1945
Mar 14.16 1898 0.75 1918 5.40 03-09-1964
Apr 12.01 1983 0.73 1915 3.63 04-12-1948
May 13.80 1957 0.30 1925 4.76 05-31-1997
Jun 18.21 1928 0.25 1933 4.86 06-28-1983
Jul 13.57 1958 0.18 1974 4.49 07-18-1958
Aug 12.77 1985 0.34 1936 4.45 08-17-1959
Sep 11.65 1965 0.00 1928 4.45 09-23-1993
Oct 10.50 1919 0.00 1924 3.76 10-16-1928
Nov 9.28 1934 0.40 1949 6.24 11-15-2005
Dec 13.01 1982 0.18 1925 5.15 12-13-1918
             
Annual 71.73 1945 27.46 1914 6.70 01-22-1999
Winter 28.87 1950 1.54 1888 6.70 01-22-1999
Spring 28.72 1945 5.36 1930 5.40 03-09-1964
Summer 26.15 1958 3.39 1930 4.86 06-28-1983
Fall 22.18 1934 3.26 1953 6.24 11-15-2005

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 8.7 6.2 2.0 0.9
Feb 8.2 5.6 2.5 0.9
Mar 10.2 7.7 3.4 1.2
Apr 10.5 8.0 3.3 1.3
May 10.2 7.9 3.5 1.5
Jun 9.3 6.5 2.9 1.0
Jul 7.2 5.3 2.4 1.0
Aug 7.0 4.8 2.6 1.1
Sep 6.7 4.9 2.1 1.0
Oct 7.2 5.4 2.5 0.9
Nov 9.4 6.9 3.1 1.5
Dec 9.6 6.7 3.0 1.0
         
Annual 104.1 75.9 33.1 13.2
Winter 26.4 18.5 7.4 2.8
Spring 30.9 23.5 10.2 4.0
Summer 23.5 16.6 7.8 3.1
Fall 23.3 17.2 7.6 3.3

Temperature Summary

Station 110187 ANNA 2 NNE, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 42.4 49.1 59.5 69.8 78.1 86.1 89.5 88.5 81.6 71.6 57.9 46.2 68.4
Low °F 22.5 26.5 35.0 44.4 53.4 61.7 65.9 63.7 56.2 44.7 35.9 26.7 44.7
Mean °F 32.5 37.8 47.3 57.1 65.8 73.9 77.7 76.1 68.9 58.2 46.9 36.5 56.6
HDD 1009 763 552 255 90 3 0 3 40 238 544 886 4383
CDD 0 0 1 18 114 272 394 346 157 27 1 0 1330

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

Temperature Extremes

Period of Record: 1887-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 44.0 1933 19.4 1977 76 01-23-1909 -20 01-12-1918
Feb 46.8 1932 24.6 1978 78 02-26-1917 -13 02-13-1905
Mar 59.3 1910 32.8 1960 91 03-23-1910 0 03-05-1960
Apr 64.6 1925 49.6 1907 92 04-28-1915 21 04-09-1996
May 74.3 1962 60.8 1997 98 05-26-1911 31 05-01-1903
Jun 81.3 1952 68.7 1903 105 06-20-1936 42 06-13-1903
Jul 85.2 1901 73.6 1947 112 07-22-1901 46 07-23-1947
Aug 85.2 1936 71.0 1927 110 08-09-1930 45 08-31-1915
Sep 78.0 1933 63.3 1974 107 09-06-1925 32 09-30-1899
Oct 67.4 1924 52.3 1976 95 10-05-1897 20 10-24-1981
Nov 57.7 1909 39.8 1951 83 11-10-1902 -5 11-25-1950
Dec 47.7 1923 25.0 1983 76 12-02-1982 -14 12-22-1989
                 
Annual 61.5 1899 54.4 1979 112 07-22-1901 -20 01-12-1918
Winter 45.1 1932 27.6 1978 78 02-26-1917 -20 01-12-1918
Spring 61.3 1977 52.1 1960 98 05-26-1911 0 03-05-1960
Summer 82.5 1936 72.3 1927 112 07-22-1901 42 06-13-1903
Fall 65.4 1931 53.5 1976 107 09-06-1925 -5 11-25-1950

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 7.4 24.3 1.3
Feb 0.0 3.5 18.0 0.4
Mar 0.0 0.5 11.7 0.0
Apr 0.1 0.0 2.7 0.0
May 0.6 0.0 0.0 0.0
Jun 7.5 0.0 0.0 0.0
Jul 15.6 0.0 0.0 0.0
Aug 11.7 0.0 0.0 0.0
Sep 3.8 0.0 0.1 0.0
Oct 0.0 0.0 1.9 0.0
Nov 0.0 0.2 10.8 0.0
Dec 0.0 4.2 20.2 0.6
         
Annual 39.4 15.9 89.9 2.3
Winter 0.0 15.2 62.5 2.3
Spring 0.7 0.5 14.5 0.0
Summer 34.8 0.0 0.0 0.0
Fall 3.9 0.2 12.8 0.0

Snowfall Summary

Station: 110187 ANNA 2 NNE, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 4.8 4.2 1.9 0.1 0.0 0.0 0.0 0.0 0.0 0.1 0.5 2.5 14.1

Snowfall Extremes

Period of Record: 1887-2006

Month High (in) Year 1-Day Max (in) Date
Jan 22.1 1978 15.0 01-11-1912
Feb 23.6 1979 20.0 02-25-1979
Mar 18.7 1960 11.3 03-17-1970
Apr 2.0 1971 2.0 04-20-1904
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 4.0 1993 2.5 10-31-1993
Nov 7.0 1958 7.0 11-28-1958
Dec 16.7 1917 12.0 12-08-1917
Season (Jul-Jun) 45.3 1978-1979 20.0 02-25-1979

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 2.2 1.2 0.7 0.2
Feb 2.2 1.2 0.7 0.2
Mar 1.2 0.6 0.3 0.1
Apr 0.1 0.1 0.0 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 0.1 0.1 0.0 0.0
Nov 0.5 0.2 0.1 0.0
Dec 1.6 0.9 0.4 0.1
Annual 8.8 4.8 2.5 0.5

Growing Season Summary

Station: 110187 ANNA 2 NNE, 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 50 104 274 518 807 1034 1189 1139 883 578 255 85 6904
45 22 52 168 377 653 885 1034 984 734 427 157 40 5525
50 8 22 91 250 500 735 880 830 585 288 86 17 4284
55 2 6 41 146 350 585 725 676 439 171 39 6 3181
60 0 1 14 72 215 436 571 521 301 83 13 1 2223
50** 28 63 165 317 519 707 819 780 582 359 143 44 4521

**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 4/10 3/23 3/27 4/23 5/16 10/22 9/22 10/07 11/07 11/12
30 4/05 3/18 3/21 4/12 4/19 11/01 10/09 10/20 11/17 11/29
28 3/31 3/02 3/16 4/11 4/18 11/07 10/10 10/22 11/24 11/30
24 3/18 2/14 3/03 4/11 4/18 11/17 10/24 11/02 12/03 12/09
20 3/09 2/07 2/12 3/23 3/25 11/27 10/24 11/04 12/18 12/22
16 2/16 12/25 1/29 3/13 3/24 12/15 11/03 11/20 12/29 1/12

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 196 159 174 214 215
30 212 182 192 232 256
28 225 183 198 248 268
24 246 206 220 266 278
20 263 226 237 295 311
16 294 237 276 330 362

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