Historical Climate Data

Precipitation Summary

Station: 114442 JACKSONVILLE 2E, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.35 1.69 3.18 3.77 4.86 4.36 3.85 3.35 3.46 2.61 3.45 2.54 38.47

Precipitation Extremes

Period of Record: 1895-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 6.05 1897 0.03 1986 3.11 01-02-1897
Feb 4.88 1951 0.00 2006 1.81 02-14-1909
Mar 6.46 1976 0.04 1910 4.58 03-13-1917
Apr 9.96 1994 0.58 1971 4.79 04-12-1994
May 12.26 1935 0.28 1934 4.75 05-01-1970
Jun 11.67 1998 0.00 1959 4.19 06-19-1973
Jul 10.64 1973 0.38 1933 3.65 07-21-1973
Aug 8.53 1956 0.39 1935 3.41 08-26-1912
Sep 15.98 1993 0.00 1979 5.02 09-23-1993
Oct 12.20 1941 0.22 1908 3.82 10-12-1969
Nov 10.92 1985 0.05 1904 2.94 11-06-1994
Dec 9.65 1982 0.12 1958 4.80 12-03-1982
             
Annual 60.05 1993 21.64 1901 5.02 09-23-1993
Winter 11.15 1983 1.40 1920 4.80 12-03-1982
Spring 18.21 1927 4.00 1934 4.79 04-12-1994
Summer 22.50 1973 3.43 1936 4.19 06-19-1973
Fall 26.06 1926 3.37 1979 5.02 09-23-1993

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 6.8 3.7 0.6 0.1
Feb 6.8 3.4 1.2 0.4
Mar 9.9 6.6 2.2 0.6
Apr 11.4 7.2 2.6 0.9
May 11.1 7.7 3.1 1.3
Jun 9.3 6.3 2.9 1.5
Jul 8.4 6.0 2.7 1.0
Aug 8.4 5.5 2.7 1.0
Sep 7.7 5.6 2.3 0.9
Oct 8.7 5.6 1.8 0.6
Nov 9.8 6.3 2.3 0.9
Dec 8.2 4.8 1.6 0.6
         
Annual 106.5 68.8 25.9 9.8
Winter 21.8 12.0 3.4 1.2
Spring 32.4 21.5 7.8 2.8
Summer 26.1 17.7 8.3 3.5
Fall 26.3 17.5 6.4 2.3

Temperature Summary

Station 114442 JACKSONVILLE 2E, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 34.4 40.3 52.1 64.2 74.4 83.3 87.0 85.0 79.3 67.6 52.4 39.4 63.3
Low °F 15.0 19.2 28.6 38.7 49.1 58.5 62.7 60.1 51.8 40.7 30.7 20.3 39.6
Mean °F 24.7 29.8 40.4 51.5 61.8 70.9 74.9 72.6 65.6 54.2 41.6 29.9 51.5
HDD 1251 988 765 413 181 19 1 18 78 345 704 1090 5853
CDD 0 0 0 5 80 196 306 253 95 10 0 0 945

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

Temperature Extremes

Period of Record: 1895-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 39.4 1933 10.1 1977 75 01-24-1950 -24 01-07-1912
Feb 42.4 1954 15.2 1979 80 02-24-1930 -28 02-27-1934
Mar 55.0 1946 26.4 1960 91 03-21-1907 -14 03-12-1948
Apr 60.9 1955 45.0 1907 94 04-10-1930 10 04-05-1920
May 70.9 1962 57.0 1924 103 05-31-1934 26 05-10-1966
Jun 79.3 1952 66.5 1982 107 06-30-1931 36 06-05-1993
Jul 84.1 1936 71.4 1967 114 07-14-1954 43 07-26-1911
Aug 82.4 1947 67.2 2004 112 08-09-1934 39 08-31-1915
Sep 74.5 1897 60.3 1974 106 09-06-1899 23 09-30-1899
Oct 66.5 1963 46.7 1925 98 10-02-1897 9 10-30-1925
Nov 51.3 1931 34.3 1976 84 11-01-1937 -5 11-30-1929
Dec 40.9 1923 16.3 1983 74 12-05-1998 -24 12-26-1944
                 
Annual 57.2 1921 48.9 1979 114 07-14-1954 -28 02-27-1934
Winter 38.1 1932 19.1 1978 80 02-24-1930 -28 02-27-1934
Spring 57.5 1921 47.0 1984 103 05-31-1934 -14 03-12-1948
Summer 80.1 1936 69.3 2004 114 07-14-1954 36 06-05-1993
Fall 61.5 1931 48.7 1976 106 09-06-1999 -5 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 14.3 29.0 4.3
Feb 0.0 8.7 23.8 3.1
Mar 0.0 2.5 19.9 0.1
Apr 0.0 0.0 6.4 0.0
May 0.5 0.0 0.3 0.0
Jun 5.0 0.0 0.0 0.0
Jul 9.6 0.0 0.0 0.0
Aug 6.6 0.0 0.0 0.0
Sep 2.9 0.0 0.4 0.0
Oct 0.0 0.0 6.4 0.0
Nov 0.0 1.4 17.6 0.1
Dec 0.0 8.9 27.0 2.2
         
Annual 24.6 35.8 130.8 9.8
Winter 0.0 31.8 79.8 9.6
Spring 0.5 2.5 26.5 0.1
Summer 21.2 0.0 0.0 0.0
Fall 2.9 1.4 24.4 0.1

Snowfall Summary

Station: 114442 JACKSONVILLE 2E, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 7.4 5.5 3.0 0.5 0.0 0.0 0.0 0.0 0.0 0.0 1.4 5.5 23.3

Snowfall Extremes

Period of Record: 1895-2006

Month High (in) Year 1-Day Max (in) Date
Jan 23.8 1977 11.5 01-12-1964
Feb 15.5 1993 11.0 02-24-1965
Mar 26.0 1960 10.5 03-09-1960
Apr 11.3 1920 6.5 04-04-1920
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 3.1 1925 3.0 10-23-1929
Nov 10.5 1975 9.0 11-27-1975
Dec 23.5 1973 8.5 12-23-1981
Season (Jul-Jun) 54.0 1977-1978 11.5 01-12-1964

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 2.8 2.1 1.2 0.2
Feb 2.8 2.1 1.2 0.2
Mar 1.4 1.1 0.7 0.2
Apr 0.3 0.3 0.1 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 0.7 0.5 0.3 0.1
Dec 2.9 2.0 1.1 0.3
Annual 12.2 8.7 5.0 0.9

Growing Season Summary

Station: 114442 JACKSONVILLE 2E, 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 13 39 143 365 687 940 1092 1020 776 454 157 33 5725
45 4 15 80 242 533 790 937 865 626 315 88 14 4514
50 0 4 41 143 383 640 782 710 479 198 44 5 3435
55 0 1 18 75 248 491 627 555 339 110 18 2 2488
60 0 0 6 33 140 344 472 401 216 52 5 0 1673
50** 10 30 100 227 429 625 742 684 505 292 97 23 3769

**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 4/22 3/29 4/07 5/09 5/17 10/08 9/20 9/24 10/22 11/04
30 4/10 3/28 3/31 4/22 5/13 10/13 9/23 9/28 11/05 11/12
28 4/07 3/24 3/28 4/18 4/19 10/20 10/02 10/08 11/10 11/20
24 4/02 3/02 3/16 4/13 4/18 11/05 10/08 10/20 11/25 12/01
20 3/18 2/08 2/25 4/07 4/11 11/16 10/20 11/04 12/07 12/11
16 3/10 2/03 2/12 3/19 3/28 11/28 11/02 11/11 12/15 12/22

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 173 145 152 189 203
30 187 153 165 207 219
28 199 176 184 221 224
24 215 187 193 247 255
20 249 207 218 273 295
16 264 236 246 294 305

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