Historical Climate Data

Precipitation Summary

Station: 115515 MCLEANSBORO, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 3.15 2.76 4.46 4.59 4.67 3.86 3.47 2.97 2.89 2.95 4.54 3.59 43.90

Precipitation Extremes

Period of Record: 1892-2002


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 14.20 1950 0.00 1893 4.40 01-14-1937
Feb 7.55 1908 0.06 1947 3.64 02-26-1945
Mar 11.29 1897 0.00 1895 5.32 03-25-1904
Apr 12.33 1996 0.71 1930 7.33 04-29-1996
May 11.70 1981 0.34 1914 4.47 05-12-1918
Jun 9.82 2000 0.00 1933 4.20 06-17-2000
Jul 10.12 1958 0.32 1918 6.40 07-27-1917
Aug 11.56 1946 0.25 1969 4.85 08-11-1945
Sep 10.11 1904 0.24 1963 4.81 09-02-1931
Oct 10.73 1919 0.00 1908 4.52 10-04-1910
Nov 9.91 1985 0.28 1914 3.44 11-20-1991
Dec 12.16 1982 0.38 1955 3.70 12-13-1918
             
Annual 63.38 1945 19.48 1914 7.33 04-29-1996
Winter 25.80 1950 3.08 1893 4.40 01-14-1937
Spring 26.10 1927 4.11 1914 7.33 04-29-1996
Summer 20.32 1946 3.73 1944 6.40 07-27-1917
Fall 19.52 1984 3.12 1953 4.81 09-02-1931

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 9.9 5.8 2.0 0.6
Feb 9.1 5.7 1.8 0.5
Mar 12.6 8.0 3.2 0.7
Apr 12.8 8.0 2.8 1.0
May 11.8 8.0 3.2 1.1
Jun 9.7 6.3 2.6 0.9
Jul 8.5 5.5 2.4 1.0
Aug 8.6 5.6 2.0 0.8
Sep 7.8 4.9 2.1 0.8
Oct 9.1 5.3 2.0 0.6
Nov 10.7 6.7 3.0 1.1
Dec 10.6 6.9 2.5 0.8
         
Annual 121.2 76.5 29.6 10.1
Winter 29.6 18.3 6.3 2.0
Spring 37.2 24.0 9.2 2.9
Summer 26.9 17.4 7.0 2.8
Fall 27.6 16.8 7.1 2.5

Temperature Summary

Station 115515 MCLEANSBORO, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 38.9 44.9 55.1 66.0 75.9 85.1 89.2 88.0 81.4 69.9 55.8 43.7 66.2
Low °F 20.3 24.1 33.7 43.4 53.0 62.0 65.8 63.0 55.1 43.4 34.8 24.7 43.6
Mean °F 29.6 34.5 44.4 54.7 64.5 73.6 77.5 75.5 68.3 56.7 45.3 34.2 54.9
HDD 1098 854 639 321 124 6 0 5 52 287 592 954 4932
CDD 0 0 0 11 107 262 388 330 150 27 0 0 1275

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 43.1 1933 13.1 1977 76 01-24-1943 -23 01-18-1930
Feb 45.9 1938 20.3 1978 79 02-13-1962 -19 02-09-1899
Mar 59.4 1910 31.8 1960 90 03-24-1929 -5 03-06-1960
Apr 62.3 1925 46.9 1907 93 04-11-1930 20 04-01-1923
May 74.0 1962 58.9 1907 100 05-29-1911 31 05-04-1926
Jun 81.3 1952 68.5 1974 106 06-29-1936 40 06-01-1972
Jul 86.7 1936 73.6 1967 113 07-13-1936 45 07-31-1971
Aug 85.6 1936 70.6 1992 111 08-27-1936 43 08-31-1915
Sep 77.5 1939 61.8 1974 108 09-05-1925 29 09-30-1899
Oct 65.9 1963 50.1 1988 97 10-06-1941 19 10-24-1981
Nov 55.2 1909 37.2 1976 85 11-01-1915 -7 11-30-1929
Dec 45.4 1923 20.2 1989 75 12-03-1982 -20 12-22-1989
                 
Annual 60.9 1914 52.4 1979 113 07-13-1936 -23 01-18-1930
Winter 42.8 1932 24.0 1978 79 02-13-1962 -23 01-18-1930
Spring 61.1 1946 50.5 1984 100 05-29-1911 -5 03-06-1960
Summer 83.0 1936 72.6 1992 113 07-13-1936 40 06-01-1972
Fall 63.1 1931 50.9 1976 108 09-05-1925 -7 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 26.5 2.0
Feb 0.0 5.8 21.3 1.1
Mar 0.0 1.1 15.1 0.0
Apr 0.0 0.0 3.9 0.0
May 0.7 0.0 0.2 0.0
Jun 7.9 0.0 0.0 0.0
Jul 15.1 0.0 0.0 0.0
Aug 12.1 0.0 0.0 0.0
Sep 5.2 0.0 0.0 0.0
Oct 0.2 0.0 4.2 0.0
Nov 0.0 0.4 13.3 0.0
Dec 0.0 5.7 23.7 0.9
         
Annual 41.2 23.1 108.2 4.0
Winter 0.0 21.6 71.5 3.9
Spring 0.7 1.1 19.2 0.0
Summer 35.1 0.0 0.0 0.0
Fall 5.4 0.4 17.5 0.0

Snowfall Summary

Station: 115515 MCLEANSBORO, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 4.9 3.9 2.2 0.4 0.0 0.0 0.0 0.0 0.0 0.2 0.7 3.6 15.9

Snowfall Extremes

Period of Record: 1892-2002

Month High (in) Year 1-Day Max (in) Date
Jan 25.0 1918 10.0 01-17-1978
Feb 19.0 1993 8.0 02-26-1906
Mar 14.1 1960 11.0 03-27-1947
Apr 8.5 1971 8.5 04-06-1971
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 6.5 1925 3.5 10-28-1925
Nov 6.0 1980 5.8 11-28-1929
Dec 13.7 2000 7.5 12-28-1990
Season (Jul-Jun) 38.4 1917-1918 11.0 03-27-1947

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 2.4 1.4 0.9 0.2
Feb 2.4 1.4 0.9 0.2
Mar 1.4 0.7 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 0.1 0.0
Nov 0.4 0.2 0.2 0.0
Dec 2.1 1.1 0.7 0.2
Annual 10.2 5.3 3.2 0.7

Growing Season Summary

Station: 115515 MCLEANSBORO, 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 34 72 215 448 760 1008 1163 1099 850 521 221 63 6460
45 14 34 128 314 606 858 1008 945 700 375 134 29 5150
50 5 13 69 199 453 708 853 790 550 247 73 11 3976
55 1 3 31 112 308 558 698 635 405 144 34 4 2939
60 0 0 12 53 184 409 543 480 273 70 12 0 2041
50** 21 48 133 269 480 679 792 739 553 334 132 38 4223

**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 3/27 5/02 5/10 10/19 9/22 10/05 11/06 11/13
30 4/07 3/19 3/20 4/16 4/23 10/23 10/03 10/08 11/10 11/20
28 4/06 3/07 3/19 4/12 4/19 10/28 10/03 10/14 11/14 11/21
24 3/24 3/01 3/11 4/10 4/18 11/14 10/20 10/24 12/03 12/09
20 3/12 2/08 2/12 3/23 4/07 11/27 10/24 11/04 12/14 12/22
16 2/20 1/15 2/01 3/14 3/26 12/10 11/03 11/13 12/22 12/25

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 190 150 168 213 215
30 203 177 185 224 228
28 209 183 192 235 250
24 229 206 212 259 269
20 260 228 237 284 311
16 289 237 257 311 340

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