Historical Climate Data

Precipitation Summary

Station: 115833 MORRISON, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.52 1.51 2.79 3.72 4.41 4.58 3.70 4.69 2.87 2.82 2.90 2.14 37.65

Precipitation Extremes

Period of Record: 1895-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 4.95 1916 0.13 1981 2.23 01-12-1960
Feb 4.39 1981 0.06 1987 1.77 02-27-1948
Mar 6.26 1991 0.40 1958 2.49 03-05-1976
Apr 8.96 1973 0.42 1915 4.00 04-21-1973
May 12.78 1974 0.77 1992 4.20 05-17-1974
Jun 11.66 2000 0.40 1910 6.06 06-04-2002
Jul 11.27 1992 0.11 1991 4.05 07-08-1951
Aug 13.29 1987 0.29 1901 4.60 08-18-1979
Sep 10.25 1970 0.04 1979 3.95 09-08-1941
Oct 8.64 1954 0.00 1952 6.10 10-10-1954
Nov 8.55 1985 0.02 1904 2.68 11-17-1952
Dec 5.57 1971 0.18 1976 2.75 12-15-1971
             
Annual 51.38 1973 20.39 1910 6.10 10-10-1954
Winter 9.01 1974 1.45 1977 2.75 12-15-1971
Spring 22.53 1973 3.60 1934 4.20 05-17-1974
Summer 23.58 1902 3.92 1910 6.06 06-04-2002
Fall 18.67 1985 2.94 1939 6.10 10-10-1954

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 8.8 3.9 0.8 0.2
Feb 7.0 4.2 0.8 0.3
Mar 10.0 6.3 1.9 0.4
Apr 11.2 6.9 2.5 0.8
May 11.7 7.9 3.2 1.1
Jun 9.9 6.8 3.1 1.3
Jul 9.7 6.2 2.5 1.1
Aug 9.6 7.0 3.4 1.4
Sep 8.4 5.2 2.1 0.7
Oct 8.8 5.2 1.9 0.6
Nov 10.0 5.8 2.0 0.6
Dec 8.9 4.8 1.4 0.4
         
Annual 113.9 70.1 25.5 9.0
Winter 24.7 12.9 3.0 0.9
Spring 32.8 21.0 7.6 2.4
Summer 29.2 20.1 9.0 3.8
Fall 27.2 16.2 6.0 1.9

Temperature Summary

Station 115833 MORRISON, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 28.8 34.3 46.6 60.1 72.1 81.6 85.0 82.9 75.8 64.0 47.4 33.8 59.4
Low °F 9.9 15.3 26.9 37.2 48.5 57.7 61.8 59.4 50.5 39.0 28.4 16.4 37.6
Mean °F 19.4 24.8 36.8 48.7 60.3 69.7 73.4 71.2 63.2 51.5 37.9 25.1 48.5
HDD 1417 1126 877 493 205 23 4 25 113 424 814 1238 6759
CDD 0 0 0 2 60 162 264 215 57 5 0 0 765

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

Temperature Extremes

Period of Record: 1895-2006


Month 		High
Mean °F
Year 		Low
Mean °F
Year 		1-Day
Max °F
Date 		1-Day
Min °F
Date
Jan 34.3 1933 5.7 1977 65 01-02-1897 -28 01-07-1910
Feb 36.6 1954 10.6 1936 72 02-15-1921 -30 02-13-1905
Mar 48.9 1945 22.9 1960 86 03-30-1986 -13 03-08-1943
Apr 56.9 1915 42.5 1907 99 04-29-1926 8 04-07-1982
May 68.4 1934 53.9 1907 105 05-31-1934 23 05-03-2005
Jun 78.2 1934 63.5 1903 106 06-01-1934 35 06-11-1972
Jul 81.1 1936 69.5 1992 112 07-14-1936 41 07-02-1904
Aug 80.5 1947 65.9 1915 105 08-18-1936 34 08-30-1920
Sep 71.2 1897 57.8 1949 103 09-05-1899 19 09-30-1899
Oct 63.7 1963 42.9 1917 93 10-06-1963 9 10-29-1925
Nov 47.1 2001 29.7 1976 80 11-01-1933 -7 11-29-1976
Dec 35.9 1923 12.7 1983 70 12-05-1998 -28 12-26-1914
                 
Annual 57.1 1896 43.3 1979 112 07-14-1936 -30 02-13-1905
Winter 32.8 1932 13.5 1979 72 02-15-1921 -30 02-13-1905
Spring 54.6 1921 44.1 1996 105 05-31-1934 -13 03-08-1943
Summer 77.2 1934 67.1 1915 112 07-14-1936 34 08-30-1920
Fall 57.6 1963 45.2 1976 103 09-05-1999 -7 11-29-1976

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 18.1 30.1 8.3
Feb 0.0 11.4 26.1 4.8
Mar 0.0 3.3 22.3 0.3
Apr 0.1 0.2 8.6 0.0
May 1.0 0.0 0.6 0.0
Jun 4.7 0.0 0.0 0.0
Jul 7.2 0.0 0.0 0.0
Aug 5.2 0.0 0.0 0.0
Sep 1.8 0.0 0.7 0.0
Oct 0.1 0.0 8.0 0.0
Nov 0.0 2.4 20.3 0.2
Dec 0.0 11.8 28.7 4.5
         
Annual 20.1 47.4 145.8 18.3
Winter 0.0 41.4 84.9 17.7
Spring 1.1 3.4 31.5 0.3
Summer 17.1 0.0 0.0 0.0
Fall 2.0 2.3 28.6 0.2

Snowfall Summary

Station: 115833 MORRISON, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 10.9 7.0 4.3 1.3 0.0 0.0 0.0 0.0 0.0 0.1 2.2 9.0 34.8

Snowfall Extremes

Period of Record: 1895-2006

Month High (in) Year 1-Day Max (in) Date
Jan 32.5 1979 13.5 01-03-1971
Feb 24.0 1905 10.0 02-15-1990
Mar 20.8 1923 10.0 03-13-1991
Apr 11.3 1910 9.0 04-17-1912
May 0.1 1909 0.1 05-01-1909
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.5 1942 0.5 09-25-1942
Oct 5.5 1967 5.5 10-27-1967
Nov 11.5 1947 6.0 11-30-1974
Dec 26.0 1951 10.0 12-14-1951
Season (Jul-Jun) 69.0 1978-1979 13.5 01-03-1971

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 4.1 2.8 1.5 0.3
Feb 4.1 2.8 1.5 0.3
Mar 2.1 1.5 0.9 0.3
Apr 0.7 0.4 0.2 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 0.1 0.0 0.0
Nov 1.4 1.1 0.5 0.1
Dec 4.8 3.8 2.0 0.4
Annual 18.6 13.6 7.2 1.7

Growing Season Summary

Station: 115833 MORRISON, 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 3 12 93 300 645 897 1053 981 710 380 96 12 5061
45 0 2 48 187 492 748 898 826 560 249 45 4 3967
50 0 0 22 102 347 600 744 671 414 147 19 2 2994
55 0 0 8 50 219 452 589 516 277 75 6 0 2138
60 0 0 3 21 120 309 434 362 165 29 1 0 1408
50** 2 9 63 187 396 588 712 652 450 242 58 8 3290

**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 4/02 4/11 5/12 5/28 10/07 9/20 9/22 10/16 11/03
30 4/22 4/01 4/06 5/09 5/16 10/12 9/20 9/23 10/22 11/04
28 4/13 3/24 3/29 4/26 5/06 10/17 9/23 10/03 11/10 12/01
24 4/05 3/14 3/24 4/13 4/19 11/03 10/02 10/16 11/20 12/01
20 3/23 2/21 3/10 4/09 4/10 11/11 10/20 10/26 11/29 12/08
16 3/13 2/10 2/23 4/01 4/09 11/22 10/30 11/08 12/09 1/01

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 162 125 141 179 203
30 171 140 152 197 205
28 188 150 167 219 235
24 211 187 193 235 242
20 229 194 213 259 268
16 255 219 234 283 304

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