Historical Climate Data

Precipitation Summary

Station: 115430 MATTOON, IL


1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 2.03 2.08 3.06 3.84 3.95 4.21 4.16 3.25 3.06 3.02 3.71 2.84 39.21

Precipitation Extremes

Period of Record: 1893-2006


Month

High (in)

Year

Low (in)

Year
1-Day
Max (in)

Date
Jan 9.91 1950 0.02 1986 3.34 01-03-1950
Feb 5.30 1950 0.33 1963 2.88 02-14-1949
Mar 7.88 1904 0.52 1999 3.31 03-25-1904
Apr 9.71 1984 0.49 1971 3.50 04-21-1984
May 11.00 1902 0.73 1895 3.22 05-31-1902
Jun 14.83 1902 0.52 1988 3.95 06-28-1957
Jul 10.07 1896 0.79 1999 3.85 07-20-1973
Aug 8.29 1981 0.14 1971 4.86 08-26-1992
Sep 9.64 1969 0.33 1985 5.03 09-01-2003
Oct 8.83 2001 0.17 1904 3.40 10-13-2001
Nov 10.02 1985 0.08 1904 3.43 11-01-1992
Dec 7.98 1967 0.16 1955 3.04 12-07-1966
             
Annual 53.79 1950 18.54 1895 5.03 09-01-2003
Winter 19.64 1950 1.89 1963 3.34 01-03-1950
Spring 22.62 2002 4.24 1895 3.50 04-21-1984
Summer 19.40 1973 3.94 1984 4.86 08-26-1992
Fall 18.47 1993 3.58 1953 5.03 09-01-2003


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 4.9 1.4 0.3
Feb 7.9 4.6 1.1 0.4
Mar 11.0 7.0 2.2 0.6
Apr 11.8 7.5 2.4 0.7
May 10.8 7.3 2.6 1.1
Jun 10.2 6.8 3.0 1.2
Jul 8.8 6.5 3.3 1.0
Aug 8.1 5.5 2.0 1.1
Sep 7.3 5.0 2.0 1.0
Oct 8.3 5.5 2.2 0.8
Nov 10.3 6.3 2.5 1.1
Dec 9.3 5.2 1.6 0.6
         
Annual 112.5 72.2 26.4 10.1
Winter 25.8 14.8 4.2 1.3
Spring 33.6 21.8 7.2 2.5
Summer 27.1 18.8 8.3 3.4
Fall 25.9 16.7 6.7 2.9


Temperature Summary

Station 115430 MATTOON, IL


1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 33.0 38.6 50.2 62.4 73.3 82.8 86.0 84.2 78.2 66.0 50.6 38.0 61.9
Low °F 16.6 21.1 31.7 42.2 53.2 62.7 66.3 64.2 55.9 44.7 33.2 22.5 42.9
Mean °F 24.8 29.9 41.0 52.3 63.3 72.8 76.2 74.2 67.1 55.4 41.9 30.3 52.4
HDD 1245 985 745 385 156 12 0 9 61 318 694 1077 5687
CDD 0 0 0 5 103 244 345 295 123 19 0 0 1134

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


Temperature Extremes

Period of Record: 1893-2002


Month
High
Mean °F

Year
Low
Mean °F

Year
1-Day
Max °F

Date
1-Day
Min °F

Date
Jan 38.0 1990 11.5 1977 70 01-25-1950 -23 01-20-1985
Feb 40.6 1998 18.3 1979 74 02-24-2000 -20 02-13-1905
Mar 52.0 1905 25.5 1960 85 03-31-1981 -8 03-06-1960
Apr 60.6 2001 46.6 1950 90 04-29-1895 17 04-03-1987
May 70.6 1977 57.5 1961 95 05-20-1987 28 05-10-1966
Jun 78.1 1952 65.0 1903 105 06-26-1954 36 06-12-1903
Jul 83.8 1901 72.1 1971 111 07-14-1954 46 07-11-1898
Aug 81.5 1900 68.8 1967 104 08-02-1901 40 08-29-1986
Sep 72.7 1998 61.1 1949 103 09-05-1954 28 09-30-1899
Oct 67.0 1900 48.9 1976 92 10-02-1953 19 10-26-1962
Nov 50.8 2001 34.8 1959 82 11-01-1950 -2 11-24-1950
Dec 38.6 1965 18.2 1983 71 12-15-1948 -20 12-22-1989
                 
Annual 59.2 1898 50.3 1979 111 07-14-1954 -23 01-20-1985
Winter 36.7 1906 20.9 1978 74 02-24-1900 -23 01-20-1985
Spring 58.7 1905 46.8 1960 95 05-20-1987 -8 03-06-1960
Summer 78.4 1901 70.7 1950 111 07-14-1954 36 06-12-1903
Fall 61.4 1900 49.6 1976 103 09-05-1954 -2 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 14.0 28.2 3.4
Feb 0.0 8.5 22.3 1.9
Mar 0.0 1.9 17.1 0.1
Apr 0.0 0.0 5.0 0.0
May 0.9 0.0 0.1 0.0
Jun 6.2 0.0 0.0 0.0
Jul 9.9 0.0 0.0 0.0
Aug 7.0 0.0 0.0 0.0
Sep 2.7 0.0 0.0 0.0
Oct 0.0 0.0 3.0 0.0
Nov 0.0 1.3 14.6 0.0
Dec 0.0 8.4 25.7 1.6
         
Annual 26.8 33.9 115.5 6.9
Winter 0.0 31.0 76.2 6.9
Spring 0.9 1.9 22.2 0.1
Summer 23.1 0.0 0.0 0.0
Fall 2.7 1.3 17.6 0.0


Snowfall Summary

Station: 115430 MATTOON, IL


1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 6.8 3.4 2.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 1.0 4.7 18.0

Snowfall Extremes

Period of Record: 1893-2006

Month High (in) Year 1-Day Max (in) Date
Jan 22.6 1997 11.0 01-09-1997
Feb 13.5 1993 8.0 02-24-1974
Mar 19.0 1978 10.0 03-07-1978
Apr 1.0 1977 1.0 04-08-1989
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 0.0 - - -
Nov 9.5 1980 7.5 11-27-1980
Dec 21.5 1973 10.0 12-19-1973
Season (Jul-Jun) 49.7 1977-1978 11.0 01-09-1997

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 1.7 1.3 0.8 0.1
Feb 1.7 1.3 0.8 0.1
Mar 1.0 0.8 0.4 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 0.0 0.0 0.0 0.0
Nov 0.6 0.3 0.2 0.1
Dec 2.2 1.7 1.0 0.3
Annual 8.8 6.9 3.9 0.7


Growing Season Summary

Station: 115430 MATTOON, 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 17 43 161 393 732 988 1127 1067 821 487 165 31 6037
45 6 17 91 264 578 838 972 912 671 344 93 12 4803
50 1 5 47 158 426 688 817 757 522 219 46 4 3698
55 0 1 21 84 287 538 662 602 378 125 19 1 2723
60 0 0 7 37 169 389 507 447 247 58 5 0 1872
50** 10 25 97 231 455 664 777 729 530 289 89 17 3918

**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 4/14 3/24 3/31 5/05 5/12 10/19 10/02 10/07 11/03 11/04
30 4/10 3/18 3/28 4/22 5/12 10/24 10/02 10/07 11/12 11/22
28 4/08 3/14 3/21 4/14 4/22 11/03 10/03 10/11 11/21 11/28
24 3/27 2/22 3/12 4/10 4/18 11/11 10/21 10/27 11/30 12/10
20 3/18 2/22 3/05 4/06 4/09 11/21 10/24 11/07 12/10 12/21
16 3/07 1/15 2/07 3/20 3/27 12/07 11/02 11/12 12/22 1/12

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 183 158 164 208 225
30 198 164 176 220 229
28 207 177 190 235 255
24 227 195 208 258 263
20 251 220 225 276 288
16 274 236 251 308 339

Back to the Station List


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