Historical Climate Data

Precipitation Summary

Station: 111265 CARBONDALE SEWAGE PLANT, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 2.91 3.01 4.25 4.45 4.78 4.77 3.35 3.94 3.13 2.93 4.62 3.71 45.85

Precipitation Extremes

Period of Record: 1894-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 17.13 1950 0.10 1943 4.78 01-14-1937
Feb 7.61 1945 0.46 1947 3.30 02-26-1945
Mar 12.00 1945 0.09 1910 5.67 03-28-1977
Apr 11.83 1996 0.77 1915 4.96 04-29-1996
May 12.59 1957 1.00 1951 5.77 05-22-1957
Jun 15.95 1935 0.23 1933 6.90 06-17-2000
Jul 13.53 1958 0.07 1901 3.96 07-13-2006
Aug 11.18 1932 0.35 1936 5.04 08-17-1959
Sep 9.52 1993 0.09 1928 4.22 09-12-1988
Oct 10.27 1910 0.00 1964 4.42 10-04-1910
Nov 9.56 1921 0.25 1910 5.35 11-20-1991
Dec 12.23 1982 0.27 1955 3.57 12-03-1982
             
Annual 74.50 1945 21.58 1901 6.90 06-17-2000
Winter 27.85 1950 2.91 1943 4.78 01-14-1937
Spring 26.81 1996 4.99 1930 5.77 05-22-1957
Summer 24.30 1928 3.95 1930 6.90 06-17-2000
Fall 21.20 1993 3.62 1939 5.35 11-20-1991

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 9.7 6.0 1.9 0.5
Feb 8.3 5.1 2.1 0.7
Mar 11.6 7.5 3.3 1.0
Apr 11.7 8.0 2.7 1.0
May 11.4 7.8 3.2 1.1
Jun 9.6 6.7 3.3 1.5
Jul 8.4 5.5 2.3 0.8
Aug 8.0 5.6 2.6 1.3
Sep 7.7 5.1 2.1 0.7
Oct 7.4 4.7 2.0 0.6
Nov 9.8 6.8 2.9 1.2
Dec 10.0 6.6 2.6 0.9
         
Annual 113.6 75.6 31.1 11.4
Winter 28.0 17.8 6.6 2.1
Spring 34.7 23.4 9.1 3.1
Summer 26.0 17.8 8.2 3.6
Fall 25.0 16.7 7.1 2.5

Temperature Summary

Station 111265 CARBONDALE SEWAGE PLANT, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 39.3 45.3 55.3 66.2 75.5 84.0 87.8 86.8 79.9 69.2 55.4 43.8 65.7
Low °F 20.8 24.2 33.5 42.4 52.1 61.4 65.9 63.1 55.1 43.3 35.0 25.6 43.5
Mean °F 30.1 34.8 44.4 54.3 63.8 72.7 76.9 75.0 67.5 56.3 45.2 34.7 54.6
HDD 1085 847 639 329 134 10 0 8 57 288 594 939 4930
CDD 0 0 0 9 96 241 368 315 132 18 0 0 1179

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

Temperature Extremes

Period of Record: 1898-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 43.4 1933 14.2 1977 76 01-24-1943 -25 01-11-1977
Feb 46.9 1932 20.8 1978 79 02-24-1982 -22 02-02-1951
Mar 59.6 1910 32.3 1960 93 03-23-1910 -11 03-05-1978
Apr 63.9 1925 49.0 1983 92 04-28-1915 20 04-01-1954
May 74.6 1962 60.2 1981 101 05-28-1911 29 05-01-1903
Jun 81.5 1952 68.3 1904 106 06-29-1931 39 06-16-1917
Jul 84.6 1901 70.3 1904 112 07-22-1901 42 07-06-1972
Aug 84.9 1936 68.4 1904 113 08-09-1930 41 08-12-1902
Sep 78.1 1925 62.6 1974 108 09-04-1925 20 09-30-1899
Oct 65.7 1963 50.3 1976 96 10-03-1922 16 10-29-1952
Nov 55.5 1931 36.4 1976 88 11-01-1933 -1 11-30-1929
Dec 46.3 1923 22.4 1989 77 12-03-1982 -14 12-22-1989
                 
Annual 60.7 1921 52.4 1979 113 08-09-1930 -25 01-11-1977
Winter 45.2 1932 25.0 1978 79 02-24-1982 -25 01-11-1977
Spring 61.0 1938 51.8 1960 101 05-28-1911 -11 03-05-1978
Summer 82.1 1936 69.0 1904 113 08-09-1930 39 06-16-1917
Fall 65.1 1931 50.6 1976 108 09-04-1925 -1 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 8.8 25.6 1.9
Feb 0.0 4.7 21.0 1.3
Mar 0.0 0.8 14.8 0.1
Apr 0.1 0.0 4.4 0.0
May 0.8 0.0 0.2 0.0
Jun 7.3 0.0 0.0 0.0
Jul 14.0 0.0 0.0 0.0
Aug 11.6 0.0 0.0 0.0
Sep 3.8 0.0 0.2 0.0
Oct 0.0 0.0 6.2 0.0
Nov 0.0 0.4 14.0 0.0
Dec 0.0 4.4 23.0 0.6
         
Annual 38.6 18.8 108.6 3.9
Winter 0.0 18.0 69.7 3.9
Spring 0.8 0.9 20.0 0.1
Summer 32.8 0.0 0.0 0.0
Fall 3.9 0.4 20.7 0.0

Snowfall Summary

Station: 111265 CARBONDALE SEWAGE PLANT, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 4.6 3.5 1.8 0.3 0.0 0.0 0.0 0.0 0.0 0.1 0.5 2.6 13.4

Snowfall Extremes

Period of Record: 1894-2006

Month High (in) Year 1-Day Max (in) Date
Jan 25.3 1918 8.5 01-17-1978
Feb 19.8 1993 10.0 02-26-1979
Mar 19.2 1960 7.5 03-15-1999
Apr 9.0 1971 6.0 04-06-1971
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 4.0 1925 2.4 10-30-1925
Nov 7.8 1958 6.5 11-27-1980
Dec 13.0 2004 8.0 12-28-1990
Season (Jul-Jun) 50.4 1911-1912 10.0 02-26-1979

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 1.6 1.3 0.7 0.2
Feb 1.6 1.3 0.7 0.2
Mar 0.7 0.5 0.4 0.1
Apr 0.1 0.1 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 0.1 0.1 0.0 0.0
Nov 0.2 0.2 0.1 0.0
Dec 1.6 0.9 0.5 0.1
Annual 6.5 4.4 2.6 0.7

Growing Season Summary

Station: 111265 CARBONDALE SEWAGE PLANT, 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 39 78 228 462 768 1011 1161 1098 839 504 222 64 6454
45 16 38 138 328 613 861 1007 944 689 359 135 29 5145
50 6 14 75 210 460 711 853 790 540 235 74 11 3974
55 2 4 35 120 313 561 699 636 395 137 34 4 2940
60 0 1 13 58 186 412 545 482 262 64 11 0 2041
50** 25 55 144 287 489 686 797 743 553 336 135 40 4281

**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 4/13 3/25 4/02 5/01 5/10 10/09 9/21 9/23 10/25 11/06
30 4/10 3/22 3/30 4/27 5/05 10/19 9/22 10/03 11/04 11/06
28 4/04 3/08 3/19 4/13 4/19 10/22 10/03 10/07 11/07 11/15
24 3/25 3/01 3/12 4/10 4/11 11/12 10/16 10/23 11/30 12/08
20 3/11 1/31 2/14 3/22 3/25 11/19 10/19 11/03 12/13 12/31
16 2/24 1/14 1/31 3/14 3/25 12/13 11/04 11/18 1/02 1/13

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 178 149 159 202 211
30 187 155 168 209 228
28 203 184 191 221 228
24 230 196 206 257 271
20 254 229 237 286 308
16 291 239 277 317 343

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