Historical Climate Data

Precipitation Summary

Station: 115712 MINONK, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.75 1.83 3.23 3.53 4.20 3.71 3.76 3.41 3.34 2.81 3.28 2.39 37.24

Precipitation Extremes

Period of Record: 1895-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 6.30 1965 0.14 1919 2.30 01-02-1897
Feb 5.66 1997 0.04 1987 3.53 02-06-1942
Mar 6.75 1979 0.00 1923 2.30 03-31-1933
Apr 7.95 1957 0.56 1971 3.05 04-05-1947
May 11.09 1995 0.19 1992 3.71 05-31-2004
Jun 9.86 1924 0.52 1936 4.73 06-27-2002
Jul 9.12 1915 0.18 1916 4.68 07-09-1951
Aug 8.89 1924 0.55 1984 5.01 08-03-1943
Sep 13.05 1961 0.31 2004 4.64 09-25-1911
Oct 9.31 1991 0.07 1964 3.84 10-23-1957
Nov 9.07 1985 0.00 1904 3.60 11-28-1990
Dec 7.93 1982 0.00 1896 4.38 12-03-1982
             
Annual 54.26 1982 20.39 1901 5.01 08-03-1943
Winter 14.33 1950 1.17 1916 4.38 12-03-1982
Spring 20.08 1944 2.78 1934 3.71 05-31-2004
Summer 25.73 1902 3.00 1936 5.01 08-03-1943
Fall 20.43 1926 2.58 1956 4.64 09-25-1911

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 9.3 4.8 0.9 0.2
Feb 7.7 4.2 1.5 0.3
Mar 10.4 6.9 2.0 0.8
Apr 11.5 7.7 2.3 0.8
May 12.1 7.6 3.2 1.0
Jun 10.2 6.9 2.7 1.0
Jul 9.0 6.3 2.8 1.1
Aug 9.4 6.1 2.1 0.8
Sep 8.6 5.2 2.2 0.8
Oct 9.2 5.7 2.0 0.4
Nov 10.4 6.8 2.2 0.8
Dec 10.1 5.7 1.2 0.5
         
Annual 118.0 74.3 25.3 8.7
Winter 27.1 14.8 3.6 1.1
Spring 34.0 22.1 7.5 2.6
Summer 28.6 19.4 7.6 2.9
Fall 28.1 17.7 6.4 2.1

Temperature Summary

Station 115712 MINONK, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 30.1 35.9 48.1 61.6 73.4 83.2 86.3 84.2 78.2 65.6 48.9 35.4 60.9
Low °F 12.6 18.2 28.6 38.3 48.8 58.4 62.2 59.7 51.8 40.5 30.0 18.8 39.0
Mean °F 21.4 27.1 38.4 50.0 61.1 70.8 74.3 72.0 65.0 53.1 39.5 27.1 50.0
HDD 1353 1063 826 457 202 18 6 21 89 381 767 1174 6357
CDD 0 0 0 5 80 192 293 237 89 10 0 0 906

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

Temperature Extremes

Period of Record: 1896-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 36.5 1933 7.5 1977 69 01-23-1909 -25 01-01-1979
Feb 38.0 1998 14.2 1936 74 02-27-1996 -28 02-13-1905
Mar 50.5 1910 23.4 1960 88 03-23-1910 -14 03-08-1943
Apr 58.0 1955 42.9 1907 93 04-11-1930 7 04-07-1982
May 69.6 1911 55.2 1945 103 05-31-1934 24 05-10-1966
Jun 78.1 1934 64.6 1903 105 06-01-1934 36 06-09-1901
Jul 82.6 1936 70.4 1971 111 07-14-1936 42 07-08-1901
Aug 81.6 1947 66.9 1915 105 08-18-1936 38 08-20-1950
Sep 72.3 1933 58.8 1918 104 09-05-1899 22 09-30-1899
Oct 63.2 1963 43.8 1925 93 10-06-1963 10 10-29-1925
Nov 49.4 2001 31.5 1976 82 11-07-1915 -9 11-28-1930
Dec 38.4 1923 12.2 1983 70 12-03-1982 -24 12-28-1924
                 
Annual 59.9 1949 47.8 1904 111 07-14-1936 -28 02-13-1905
Winter 35.3 1932 16.8 1977 74 02-27-1996 -28 02-13-1905
Spring 55.8 1977 44.8 1960 103 05-31-1934 -14 03-08-1943
Summer 77.9 1936 68.8 1915 111 07-14-1936 36 06-09-1901
Fall 59.6 1931 47.9 1976 104 09-05-1999 -9 11-28-1930

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 16.6 29.5 6.7
Feb 0.0 10.2 25.0 3.4
Mar 0.0 3.4 20.8 0.1
Apr 0.2 0.2 7.8 0.0
May 1.4 0.0 0.8 0.0
Jun 6.6 0.0 0.0 0.0
Jul 9.7 0.0 0.0 0.0
Aug 6.0 0.0 0.0 0.0
Sep 2.7 0.0 0.4 0.0
Oct 0.0 0.0 6.0 0.0
Nov 0.0 2.0 18.3 0.1
Dec 0.0 10.8 28.1 3.6
         
Annual 26.5 43.1 136.8 14.0
Winter 0.0 37.6 82.6 13.8
Spring 1.6 3.6 29.8 0.1
Summer 22.3 0.0 0.0 0.0
Fall 2.8 2.0 24.7 0.1

Snowfall Summary

Station: 115712 MINONK, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 8.9 6.3 3.5 0.9 0.0 0.0 0.0 0.0 0.0 0.1 1.6 6.8 28.1

Snowfall Extremes

Period of Record: 1895-2006

Month High (in) Year 1-Day Max (in) Date
Jan 21.1 1999 12.0 01-30-1939
Feb 19.0 1908 12.0 02-07-1933
Mar 19.0 1960 10.0 03-25-1930
Apr 13.0 1997 12.0 04-04-1920
May 0.8 1907 0.8 05-03-1907
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 2.0 1942 2.0 09-25-1942
Oct 2.1 1967 2.1 10-27-1967
Nov 13.8 1895 10.0 11-26-1895
Dec 22.0 1969 10.0 12-25-1909
Season (Jul-Jun) 61.5 1969-1970 12.0 04-04-1920

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 3.8 2.4 1.3 0.2
Feb 3.8 2.4 1.3 0.2
Mar 1.9 1.3 0.8 0.1
Apr 0.3 0.2 0.1 0.1
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 0.0 0.0 0.0
Nov 1.7 0.8 0.1 0.0
Dec 4.5 2.4 1.4 0.2
Annual 17.6 10.5 5.5 0.9

Growing Season Summary

Station: 115712 MINONK, 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 6 22 115 332 666 940 1076 995 765 426 123 18 5468
45 1 7 63 214 513 790 921 841 615 291 66 8 4317
50 0 2 32 123 366 640 766 688 468 181 31 3 3288
55 0 0 13 63 237 491 611 535 328 99 11 1 2380
60 0 0 5 28 136 345 456 383 207 45 2 0 1600
50** 4 15 76 209 417 620 724 665 494 270 72 11 3568

**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 4/25 3/31 4/08 5/13 5/28 10/11 9/23 9/23 10/20 11/03
30 4/21 3/27 4/06 5/06 5/09 10/16 9/23 9/26 11/03 11/10
28 4/12 3/27 4/02 4/29 5/07 10/20 9/23 10/05 11/09 11/20
24 4/05 3/14 3/18 4/14 4/22 11/03 10/08 10/20 11/18 11/28
20 3/21 2/22 3/14 4/10 4/11 11/11 10/08 10/22 11/27 12/11
16 3/13 2/13 2/23 4/05 4/10 11/21 10/24 11/05 12/09 12/22

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 171 134 139 188 199
30 178 137 164 204 216
28 188 152 170 216 225
24 212 182 194 234 254
20 232 187 209 253 261
16 253 216 220 283 284

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