Historical Climate Data

Precipitation Summary

Station: 112140 DANVILLE, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 2.05 1.99 3.17 3.86 4.47 4.70 4.39 3.94 3.03 3.04 3.53 2.79 40.96

Precipitation Extremes

Period of Record: 1895-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 8.88 1950 0.08 1986 2.28 01-12-1916
Feb 6.29 1990 0.00 1924 2.45 02-22-1990
Mar 7.93 1898 0.77 1960 3.10 03-13-1917
Apr 10.86 1994 0.59 1976 4.06 04-19-1970
May 12.94 1943 0.18 1964 3.92 05-17-1943
Jun 12.44 1998 0.25 1936 3.76 06-25-1995
Jul 13.95 1962 0.00 1901 5.08 07-21-1949
Aug 9.84 1979 0.56 1953 5.40 08-04-1968
Sep 12.01 1926 0.04 1979 3.70 09-01-2003
Oct 8.62 1941 0.35 1964 4.62 10-12-1969
Nov 10.25 1985 0.07 1904 3.71 11-01-1992
Dec 7.65 1967 0.11 1900 2.11 12-18-1924
             
Annual 54.24 1990 18.86 1901 5.40 08-04-1968
Winter 17.75 1950 0.71 1931 2.45 02-22-1990
Spring 18.76 1922 4.23 1934 4.06 04-19-1970
Summer 22.17 1958 3.34 1959 5.40 08-04-1968
Fall 17.45 1955 3.51 1963 4.62 10-12-1969

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 10.1 5.2 1.2 0.3
Feb 8.2 4.6 1.1 0.4
Mar 10.7 7.4 2.2 0.5
Apr 12.4 8.0 2.5 0.8
May 12.0 8.1 2.7 1.0
Jun 10.6 7.4 3.0 1.4
Jul 9.4 7.1 3.2 1.2
Aug 9.4 6.0 2.7 1.4
Sep 8.4 5.1 2.0 0.8
Oct 9.0 5.7 1.9 0.6
Nov 9.9 6.9 2.4 0.9
Dec 10.8 6.2 1.9 0.5
         
Annual 120.8 77.8 27.0 9.9
Winter 29.1 16.0 4.3 1.2
Spring 35.1 23.5 7.5 2.3
Summer 29.4 20.5 8.9 4.1
Fall 27.2 17.7 6.3 2.2

Temperature Summary

Station 112140 DANVILLE, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 34.2 40.0 52.0 64.5 75.2 83.5 86.2 84.1 78.4 66.6 51.6 38.7 62.9
Low °F 17.3 21.9 31.7 41.0 50.7 60.0 64.3 62.6 54.7 43.3 33.8 23.0 42.0
Mean °F 25.8 31.0 41.9 52.8 63.0 71.8 75.3 73.4 66.6 55.0 42.7 30.9 52.5
HDD 1217 954 718 373 155 14 0 9 63 325 669 1058 5555
CDD 0 0 0 6 92 217 319 269 110 14 0 0 1027

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 40.0 2006 10.2 1977 70 01-25-1950 -26 01-17-1982
Feb 40.2 1954 16.9 1978 74 02-25-2000 -22 02-27-1934
Mar 52.4 1946 26.1 1960 84 03-24-1929 -13 03-08-1943
Apr 58.9 2001 45.9 1926 94 04-27-1896 12 04-07-1982
May 71.7 1902 55.7 1924 103 05-22-1925 25 05-10-1966
Jun 78.6 1901 65.8 1928 105 06-26-1954 36 06-16-1917
Jul 82.1 1936 71.2 1947 112 07-14-1936 41 07-23-1947
Aug 80.2 1947 67.3 1927 107 08-05-1918 37 08-30-1946
Sep 73.3 1925 59.5 1918 102 09-05-1899 22 09-29-1899
Oct 62.6 1963 46.0 1925 98 10-13-1940 13 10-30-1895
Nov 50.6 1931 34.1 1976 82 11-06-1915 -6 11-28-1930
Dec 40.3 1923 18.0 1989 72 12-02-1982 -25 12-22-1989
                 
Annual 57.1 1921 47.5 1922 112 07-14-1936 -26 01-17-1982
Winter 38.2 1932 20.7 1977 74 02-25-1900 -26 01-17-1982
Spring 57.9 1977 45.6 1960 103 05-22-1925 -13 03-08-1943
Summer 78.0 1901 69.1 1927 112 07-14-1936 36 06-16-1917
Fall 60.4 1931 48.7 1976 102 09-05-1999 -6 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 13.7 27.3 4.2
Feb 0.0 8.0 22.5 2.5
Mar 0.0 1.6 17.3 0.1
Apr 0.1 0.0 6.2 0.0
May 0.9 0.0 0.4 0.0
Jun 5.8 0.0 0.0 0.0
Jul 8.4 0.0 0.0 0.0
Aug 5.1 0.0 0.0 0.0
Sep 2.0 0.0 0.1 0.0
Oct 0.0 0.0 4.9 0.0
Nov 0.0 1.0 14.9 0.0
Dec 0.0 7.6 24.6 1.7
         
Annual 22.3 32.0 118.2 8.6
Winter 0.0 29.3 74.5 8.5
Spring 1.0 1.6 23.8 0.1
Summer 19.3 0.0 0.0 0.0
Fall 2.0 1.0 20.0 0.0

Snowfall Summary

Station: 112140 DANVILLE, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 6.3 4.4 3.0 0.2 0.0 0.0 0.0 0.0 0.0 0.1 1.0 5.8 20.8

Snowfall Extremes

Period of Record: 1895-2006

Month High (in) Year 1-Day Max (in) Date
Jan 23.0 1979 12.0 01-13-1927
Feb 18.9 1914 14.0 02-21-1912
Mar 14.5 1960 8.0 03-07-1931
Apr 5.4 1982 4.6 04-05-1982
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 4.4 1989 3.2 10-20-1989
Nov 11.0 1932 8.3 11-27-1980
Dec 23.3 1973 13.0 12-19-1973
Season (Jul-Jun) 45.4 1942-1943 14.0 02-21-1912

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 2.6 1.6 1.0 0.1
Feb 2.6 1.6 1.0 0.1
Mar 1.6 1.0 0.6 0.2
Apr 0.2 0.0 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 0.1 0.1 0.0 0.0
Nov 0.7 0.4 0.1 0.0
Dec 3.6 1.9 1.0 0.3
Annual 12.9 6.8 3.8 0.8

Growing Season Summary

Station: 112140 DANVILLE, 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 42 168 397 718 958 1101 1039 803 475 173 39 5930
45 6 17 97 268 563 808 946 884 653 332 99 18 4695
50 2 5 51 163 411 658 791 730 505 209 49 8 3586
55 0 1 23 89 272 509 636 575 361 115 21 2 2609
60 0 0 7 40 156 362 481 421 231 52 6 0 1759
50** 9 25 105 246 456 640 755 710 523 293 96 19 3878

**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 3/30 4/10 5/11 5/17 10/11 9/22 10/01 10/21 10/29
30 4/21 3/28 4/05 5/07 5/12 10/19 9/22 10/03 11/03 11/04
28 4/10 3/24 4/02 4/28 5/05 10/26 10/03 10/09 11/08 11/20
24 4/05 3/07 3/19 4/13 4/23 11/05 10/14 10/21 11/28 12/11
20 3/18 2/22 3/08 4/07 4/09 11/18 10/24 11/02 12/06 12/11
16 3/11 2/09 2/18 3/26 4/07 11/30 11/02 11/10 12/22 1/02

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 169 137 146 190 201
30 180 144 163 202 209
28 196 165 177 217 226
24 215 194 202 248 257
20 241 220 222 265 276
16 264 222 242 293 311

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