Historical Climate Data

Precipitation Summary

Station: 113109 FLORA 5 NW, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 2.74 2.49 4.02 4.14 4.31 4.34 3.88 3.34 3.20 3.03 4.09 3.36 42.94

Precipitation Extremes

Period of Record: 1893-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 10.36 1949 0.00 1986 3.25 01-13-2005
Feb 5.51 1951 0.00 1916 2.45 02-26-1945
Mar 13.01 1931 0.24 1910 11.00 03-07-1931
Apr 12.94 1893 0.27 1915 4.51 04-22-1944
May 14.90 1961 0.21 1914 5.30 05-07-1961
Jun 9.35 1942 0.54 1944 5.10 06-18-1964
Jul 11.99 1979 0.00 1930 5.33 07-04-1912
Aug 9.92 1985 0.09 1909 7.00 08-09-2006
Sep 9.82 1911 0.15 1940 3.55 09-01-1931
Oct 13.95 1919 0.00 1895 3.80 10-26-1919
Nov 13.07 1985 0.00 1916 4.94 11-14-1993
Dec 9.03 1982 0.31 1896 3.46 12-03-1982
             
Annual 60.48 1993 22.23 1958 11.00 03-07-1931
Winter 20.13 1950 2.39 1963 3.46 12-03-1982
Spring 24.85 1961 4.83 1930 11.00 03-07-1931
Summer 21.80 2000 4.15 2002 7.00 08-09-2006
Fall 20.42 1919 2.82 1999 4.94 11-14-1993

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 7.9 5.1 1.9 0.4
Feb 6.5 4.9 1.8 0.6
Mar 9.2 7.7 2.9 0.9
Apr 10.3 8.1 3.0 0.9
May 9.8 7.6 3.0 1.1
Jun 9.2 7.1 2.9 1.2
Jul 7.4 6.0 2.8 1.0
Aug 7.1 5.3 2.4 1.1
Sep 6.9 5.3 2.1 0.9
Oct 7.6 5.2 2.1 0.8
Nov 8.9 6.5 2.9 1.3
Dec 8.2 6.3 2.6 0.8
         
Annual 99.0 75.3 30.6 11.0
Winter 22.6 16.4 6.3 1.9
Spring 29.3 23.4 8.9 2.9
Summer 23.7 18.4 8.2 3.2
Fall 23.3 17.1 7.1 3.0

Temperature Summary

Station 113109 FLORA 5 NW, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 38.1 44.2 55.4 66.8 76.4 85.0 88.6 86.9 80.3 69.3 54.7 42.5 65.7
Low °F 20.7 25.1 34.3 43.3 52.8 61.5 65.4 63.2 55.6 44.8 35.3 25.4 44.0
Mean °F 29.4 34.7 44.9 55.1 64.6 73.3 77.0 75.1 68.0 57.1 45.0 34.0 54.9
HDD 1103 850 626 309 121 8 0 5 48 272 600 964 4906
CDD 0 0 0 10 108 256 372 317 137 24 0 0 1224

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 42.4 2006 13.6 1977 75 01-24-1943 -25 01-27-1904
Feb 44.2 1938 19.5 1978 79 02-29-1972 -25 02-10-1982
Mar 55.4 1946 29.0 1960 89 03-24-1929 -14 03-05-1978
Apr 62.7 1925 46.5 1907 97 04-26-1989 18 04-07-1990
May 71.8 1962 58.2 1917 96 05-30-1913 29 05-01-1903
Jun 80.3 1934 67.1 1903 105 06-19-1913 38 06-06-1894
Jul 85.1 1936 72.6 1924 111 07-28-1930 44 07-02-1988
Aug 84.2 1936 69.5 1927 109 08-09-1930 39 08-29-1986
Sep 76.4 1933 60.3 1918 108 09-01-1953 25 09-30-1899
Oct 64.5 1963 49.5 1925 97 10-02-1910 6 10-19-1946
Nov 54.0 1909 36.5 1976 86 11-01-1950 -2 11-30-1929
Dec 43.6 1923 21.1 2000 73 12-07-1916 -21 12-22-1989
                 
Annual 61.6 1915 51.1 1916 111 07-28-1930 -25 01-27-1904
Winter 41.4 1932 23.8 1978 79 02-29-1972 -25 01-27-1904
Spring 59.7 1991 49.0 1960 97 04-26-1989 -14 03-05-1978
Summer 81.6 1936 71.3 1927 111 07-28-1930 38 06-06-1994
Fall 62.9 1931 51.0 1976 108 09-01-1953 -2 11-30-1929

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 10.1 25.4 2.4
Feb 0.0 5.6 19.9 1.5
Mar 0.0 0.9 14.5 0.1
Apr 0.1 0.0 4.4 0.0
May 1.1 0.0 0.4 0.0
Jun 8.3 0.0 0.0 0.0
Jul 14.5 0.0 0.0 0.0
Aug 10.8 0.0 0.0 0.0
Sep 4.3 0.0 0.2 0.0
Oct 0.1 0.0 4.5 0.0
Nov 0.0 0.4 12.6 0.0
Dec 0.0 5.6 22.6 1.4
         
Annual 39.5 22.4 104.2 5.3
Winter 0.0 21.2 67.9 5.2
Spring 1.2 0.9 19.3 0.1
Summer 33.6 0.0 0.0 0.0
Fall 4.5 0.4 17.3 0.0

Snowfall Summary

Station: 113109 FLORA 5 NW, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 2.5 1.9 1.2 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.7 1.9 8.4

Snowfall Extremes

Period of Record: 1893-2006

Month High (in) Year 1-Day Max (in) Date
Jan 21.4 1918 12.0 01-15-1918
Feb 17.2 1914 10.0 02-21-1912
Mar 14.0 1912 11.0 03-13-1937
Apr 6.0 1971 6.0 04-06-1971
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 1.5 1913 1.5 10-29-1913
Nov 7.5 1906 7.5 11-14-1906
Dec 16.3 1969 6.3 12-24-1939
Season (Jul-Jun) 39.0 1911-1912 12.0 01-15-1918

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 1.1 0.6 0.3 0.1
Feb 1.1 0.6 0.3 0.1
Mar 0.7 0.3 0.2 0.1
Apr 0.1 0.0 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 0.0 0.0 0.0 0.0
Nov 0.4 0.3 0.2 0.0
Dec 1.0 0.6 0.4 0.2
Annual 4.7 2.5 1.6 0.4

Growing Season Summary

Station: 113109 FLORA 5 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 37 76 230 466 775 1011 1160 1100 853 545 222 64 6526
45 15 37 140 330 620 861 1005 946 703 399 135 30 5213
50 6 14 77 213 466 712 851 791 554 267 74 13 4034
55 1 4 38 122 321 562 696 636 408 159 33 4 2984
60 0 0 15 60 193 413 541 481 274 80 11 1 2072
50** 21 46 144 291 500 683 789 744 563 348 128 34 4283

**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 4/18 3/26 4/06 5/10 5/17 10/10 9/19 9/23 10/30 11/10
30 4/11 3/24 3/29 5/01 5/09 10/12 9/22 9/28 11/03 11/10
28 4/08 3/20 3/24 4/21 4/23 10/23 10/02 10/08 11/06 11/12
24 3/26 3/07 3/14 4/12 4/19 11/07 10/13 10/20 11/23 12/04
20 3/16 2/22 3/01 3/28 4/18 11/19 10/24 11/03 12/08 12/11
16 3/02 1/15 2/09 3/19 3/25 11/29 11/04 11/09 12/24 1/02

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 173 137 152 198 202
30 181 155 160 204 215
28 201 169 183 213 226
24 220 195 207 248 261
20 246 222 226 269 287
16 273 238 247 310 319

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