Historical Climate Data

Precipitation Summary

Station: 114489 JERSEYVILLE 2 SW, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.92 2.01 3.51 4.14 3.95 3.68 3.51 2.91 3.23 2.86 3.77 2.82 38.31

Precipitation Extremes

Period of Record: 1940-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 7.74 2005 0.03 1986 2.21 01-04-1993
Feb 6.49 1951 0.26 2006 2.13 02-26-1957
Mar 7.09 1948 0.55 1971 2.82 03-12-1977
Apr 12.36 1994 1.12 1976 3.22 04-24-1975
May 12.10 2002 0.67 1986 3.73 05-02-1983
Jun 9.70 1957 0.17 1959 3.57 06-12-2002
Jul 8.44 1942 0.66 1997 2.67 07-14-1955
Aug 10.19 1961 0.12 1984 5.81 08-11-1961
Sep 10.71 1993 0.00 1940 3.78 09-09-1989
Oct 9.66 1941 0.32 1964 3.74 10-12-1969
Nov 10.28 1985 0.09 1949 3.52 11-18-2003
Dec 9.31 1982 0.06 1958 5.12 12-03-1982
             
Annual 53.22 1993 24.43 1980 5.81 08-11-1961
Winter 12.47 1950 2.24 1981 5.12 12-03-1982
Spring 20.98 2002 2.80 1986 3.73 05-02-1983
Summer 19.25 1942 3.45 1984 5.81 08-11-1961
Fall 18.01 1993 3.32 1940 3.78 09-09-1989

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 7.4 4.2 1.2 0.3
Feb 6.7 4.1 1.3 0.5
Mar 9.7 6.8 2.6 0.8
Apr 11.2 7.0 2.8 0.9
May 11.1 7.4 2.9 1.0
Jun 8.8 6.1 2.9 1.1
Jul 8.3 5.8 2.6 1.1
Aug 7.2 4.9 1.9 0.8
Sep 7.7 5.1 2.3 0.9
Oct 8.8 5.7 2.0 0.7
Nov 9.2 6.6 2.9 1.1
Dec 7.9 5.2 1.7 0.8
         
Annual 104.0 68.8 26.9 9.9
Winter 22.1 13.5 4.2 1.6
Spring 32.1 21.3 8.3 2.8
Summer 24.2 16.7 7.3 2.9
Fall 25.7 17.4 7.1 2.6

Temperature Summary

Station 114489 JERSEYVILLE 2 SW, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 35.3 41.3 52.5 64.2 74.3 83.1 87.5 85.9 78.8 67.6 52.5 40.0 63.6
Low °F 17.3 22.2 32.2 42.1 52.1 61.4 65.7 63.1 54.6 43.3 33.6 22.8 42.5
Mean °F 26.3 31.8 42.4 53.2 63.2 72.3 76.6 74.5 66.7 55.5 43.1 31.4 53.1
HDD 1200 932 702 364 150 12 0 9 71 310 658 1041 5449
CDD 0 0 0 8 93 228 360 302 121 13 0 0 1125

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

Temperature Extremes

Period of Record: 1940-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 39.0 2006 10.3 1977 74 01-24-1950 -25 01-17-1977
Feb 42.8 1954 17.1 1978 80 02-29-1972 -22 02-09-1979
Mar 50.4 1973 28.6 1960 86 03-29-1985 -11 03-05-1960
Apr 61.9 1954 47.8 1983 92 04-28-1951 18 04-02-1961
May 71.4 1962 57.9 1981 96 05-26-1953 28 05-04-1976
Jun 80.9 1952 67.6 1982 104 06-26-1954 37 06-01-1972
Jul 82.6 1954 72.2 1967 112 07-14-1954 43 07-27-1962
Aug 79.9 1983 68.4 1992 105 08-03-1964 38 08-29-1986
Sep 72.1 1960 61.4 1974 102 09-04-1954 27 09-23-1983
Oct 67.4 1963 49.7 1976 93 10-02-1953 17 10-21-1952
Nov 50.3 2001 35.5 1976 84 11-01-1950 -2 11-30-1964
Dec 41.0 1965 17.3 1983 74 12-15-1948 -19 12-30-1983
                 
Annual 57.2 1953 47.0 1979 112 07-14-1954 -25 01-17-1977
Winter 37.2 1950 20.9 1978 80 02-29-1972 -25 01-17-1977
Spring 58.2 1977 48.6 2001 96 05-26-1953 -11 03-05-1960
Summer 79.5 1954 71.0 2004 112 07-14-1954 37 06-01-1972
Fall 61.5 1963 49.8 1976 102 09-04-1954 -2 11-30-1964

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 12.3 28.1 3.7
Feb 0.0 7.1 22.6 2.2
Mar 0.0 1.7 16.5 0.1
Apr 0.1 0.0 4.9 0.0
May 0.6 0.0 0.3 0.0
Jun 5.5 0.0 0.0 0.0
Jul 12.5 0.0 0.0 0.0
Aug 9.3 0.0 0.0 0.0
Sep 3.3 0.0 0.3 0.0
Oct 0.0 0.0 5.0 0.0
Nov 0.0 1.2 15.1 0.0
Dec 0.0 7.4 25.6 1.7
         
Annual 31.4 30.0 118.6 7.9
Winter 0.0 26.8 76.4 7.7
Spring 0.7 1.7 21.9 0.1
Summer 27.5 0.0 0.0 0.0
Fall 3.4 1.2 20.0 0.0

Snowfall Summary

Station: 114489 JERSEYVILLE 2 SW, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 5.1 3.6 2.9 0.5 0.0 0.0 0.0 0.0 0.0 0.0 1.2 3.7 17.0

Snowfall Extremes

Period of Record: 1940-2006

Month High (in) Year 1-Day Max (in) Date
Jan 18.0 1979 7.5 01-02-1999
Feb 18.0 1993 8.0 02-16-1993
Mar 24.8 1960 11.0 03-24-1990
Apr 5.0 1971 5.0 04-06-1971
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 0.0 - - -
Nov 8.0 1951 8.0 11-06-1951
Dec 26.0 1973 12.0 12-31-1973
Season (Jul-Jun) 45.7 1977-1978 12.0 12-31-1973

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 1.8 1.4 0.9 0.1
Feb 1.8 1.4 0.9 0.1
Mar 0.9 0.8 0.5 0.2
Apr 0.2 0.2 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 0.5 0.4 0.2 0.1
Dec 1.7 1.3 0.7 0.2
Annual 7.9 6.4 3.6 0.9

Growing Season Summary

Station: 114489 JERSEYVILLE 2 SW, 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 22 57 188 419 733 972 1138 1073 806 486 183 44 6060
45 7 25 110 289 579 822 984 918 656 345 107 18 4816
50 2 9 60 181 428 673 829 763 508 223 56 7 3704
55 0 2 29 101 287 524 675 608 366 127 23 2 2720
60 0 0 10 48 168 378 520 453 239 59 7 0 1869
50** 15 39 117 250 461 654 777 725 526 306 108 28 3969

**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 4/17 3/28 4/06 5/09 5/17 10/10 9/21 9/23 10/21 11/03
30 4/10 3/24 3/27 4/26 5/09 10/17 9/23 10/01 11/05 11/10
28 4/05 3/07 3/25 4/15 5/05 10/22 9/23 10/04 11/05 11/10
24 3/23 3/06 3/12 4/11 4/19 11/04 10/07 10/16 11/30 12/05
20 3/14 2/16 2/28 3/26 4/07 11/17 10/20 10/23 12/10 12/22
16 3/07 1/15 2/08 3/23 3/26 12/03 11/02 11/10 12/19 12/22

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 174 149 158 196 204
30 187 149 165 210 228
28 201 156 178 218 228
24 226 191 200 260 264
20 250 220 225 273 284
16 273 237 246 308 340

Back to the Station List

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