Historical Climate Data

Precipitation Summary

Station: 117150 RANTOUL, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Prec. (in) 1.72 1.78 3.06 3.64 4.21 3.88 4.39 4.35 2.95 2.91 3.17 2.69 38.75

Precipitation Extremes

Period of Record: 1893-2006


Month
High (in)
Year
Low (in)
Year 		1-Day
Max (in)
Date
Jan 6.80 2005 0.02 1986 2.61 01-21-1959
Feb 5.34 1909 0.08 1907 2.00 02-25-2001
Mar 7.50 1963 0.43 1910 3.15 03-11-1990
Apr 9.85 1994 0.67 1976 4.50 04-12-1994
May 10.66 1908 0.20 1964 6.01 05-27-1956
Jun 13.54 1902 0.23 1988 5.09 06-21-1900
Jul 12.44 1962 0.38 1893 5.05 07-30-1987
Aug 12.82 1977 0.20 1893 6.15 08-06-1977
Sep 9.72 1970 0.00 1979 3.87 09-22-1970
Oct 9.90 1949 0.01 1964 3.50 10-22-1983
Nov 7.99 1985 0.10 1904 2.40 11-23-1982
Dec 7.49 1895 0.02 1976 2.86 12-07-1966
             
Annual 54.43 1993 13.14 1964 6.15 08-06-1977
Winter 16.38 1950 0.96 1977 2.86 12-07-1966
Spring 18.49 1908 4.83 1992 6.01 05-27-1956
Summer 25.32 1902 1.69 1893 6.15 08-06-1977
Fall 16.24 1993 0.60 1964 3.87 09-22-1970

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 7.2 4.6 1.0 0.3
Feb 6.2 4.3 1.2 0.5
Mar 8.7 6.0 2.3 0.7
Apr 10.4 7.7 2.5 0.7
May 10.4 7.8 3.1 1.2
Jun 8.3 6.3 3.0 1.2
Jul 7.9 5.9 3.1 1.6
Aug 8.6 6.2 2.9 1.2
Sep 6.9 5.1 2.0 0.9
Oct 7.2 5.5 2.3 0.9
Nov 8.3 6.0 1.8 0.9
Dec 7.7 5.6 2.0 0.6
         
Annual 97.8 71.2 27.4 10.6
Winter 21.0 14.5 4.2 1.3
Spring 29.5 21.5 7.9 2.6
Summer 24.8 18.5 9.0 4.0
Fall 22.4 16.7 6.2 2.6

Temperature Summary

Station 117150 RANTOUL, IL

1971-2000 NCDC Normals

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
High °F 32.6 38.2 49.9 62.7 74.5 84.3 87.4 85.3 79.2 66.5 50.7 37.8 62.4
Low °F 13.7 18.5 29.0 38.7 50.2 60.2 63.5 61.1 52.7 41.1 30.8 20.3 40.0
Mean °F 23.2 28.4 39.5 50.7 62.4 72.3 75.5 73.2 66.0 53.8 40.8 29.1 51.2
HDD 1298 1026 792 434 183 18 2 14 76 360 728 1115 6046
CDD 0 0 0 5 102 234 326 269 104 14 0 0 1054

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 36.2 2006 7.7 1977 70 01-23-1909 -27 01-20-1985
Feb 39.1 1954 14.5 1978 72 02-27-1996 -24 02-13-1905
Mar 51.3 1910 23.4 1960 87 03-21-1907 -13 03-02-1980
Apr 58.1 1955 42.2 1907 91 04-29-1899 10 04-07-1982
May 70.6 1991 55.8 1907 97 05-01-1965 26 05-01-1903
Jun 78.0 1971 65.1 1958 104 06-20-1953 36 06-03-1910
Jul 80.6 1901 71.5 2000 109 07-14-1954 42 07-02-1904
Aug 79.9 1995 67.9 2004 102 08-02-1901 38 08-29-1986
Sep 74.2 1978 60.4 1975 103 09-05-1899 24 09-30-1899
Oct 63.4 1971 47.2 1987 92 10-04-1897 20 10-29-1910
Nov 50.5 1909 32.7 1996 81 11-01-1968 -5 11-24-1950
Dec 38.4 1965 15.5 1989 70 12-15-1948 -22 12-23-1989
                 
Annual 54.1 1991 49.0 1996 109 07-14-1954 -27 01-20-1985
Winter 33.7 1998 17.4 1978 72 02-27-1996 -27 01-20-1985
Spring 56.8 1977 44.7 1960 97 05-01-1965 -13 03-02-1980
Summer 77.5 1995 69.9 1992 109 07-14-1954 36 06-03-1910
Fall 59.4 1971 49.6 1976 103 09-05-1999 -5 11-24-1950

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 15.0 29.5 5.9
Feb 0.0 9.9 24.5 3.4
Mar 0.0 2.2 20.4 0.2
Apr 0.0 0.1 7.3 0.0
May 2.0 0.0 0.3 0.0
Jun 7.7 0.0 0.0 0.0
Jul 10.2 0.0 0.0 0.0
Aug 6.2 0.0 0.0 0.0
Sep 2.9 0.0 0.1 0.0
Oct 0.0 0.0 5.7 0.0
Nov 0.0 1.5 18.3 0.0
Dec 0.0 9.5 27.3 2.6
         
Annual 29.8 37.4 131.6 11.8
Winter 0.0 34.3 81.3 11.8
Spring 2.0 2.3 27.9 0.2
Summer 24.2 0.0 0.0 0.0
Fall 3.0 1.5 24.2 0.0

Snowfall Summary

Station: 117150 RANTOUL, IL

1971-2000 Averages

Element Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann
Snow (in) 3.5 3.2 1.7 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.5 2.6 11.9

Snowfall Extremes

Period of Record: 1893-2006

Month High (in) Year 1-Day Max (in) Date
Jan 19.0 1982 9.0 01-23-1894
Feb 24.0 1982 16.0 02-01-1982
Mar 15.4 1960 7.0 03-28-1894
Apr 6.0 1982 4.3 04-08-1957
May 0.0 - - -
Jun 0.0 - - -
Jul 0.0 - - -
Aug 0.0 - - -
Sep 0.0 - - -
Oct 0.0 - - -
Nov 14.8 1951 9.4 11-06-1951
Dec 17.7 1973 8.5 12-02-1893
Season (Jul-Jun) 58.0 1981-1982 16.0 02-01-1982

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 1.4 1.0 0.7 0.2
Feb 1.4 1.0 0.7 0.2
Mar 0.7 0.5 0.4 0.1
Apr 0.2 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 0.0 0.0 0.0 0.0
Nov 0.3 0.2 0.1 0.0
Dec 1.2 0.9 0.6 0.2
Annual 5.0 3.8 2.4 0.5

Growing Season Summary

Station: 117150 RANTOUL, 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 10 26 121 335 676 954 1083 1011 757 435 130 26 5554
45 2 9 67 216 525 805 929 857 611 299 68 11 4396
50 0 2 34 124 379 656 775 704 466 185 33 4 3363
55 0 0 13 62 247 508 622 551 329 99 12 1 2447
60 0 0 4 28 141 364 468 398 209 43 2 0 1659
50** 6 18 80 207 419 631 733 680 488 273 79 16 3625

**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 4/23 4/08 4/10 5/08 5/20 10/11 9/22 9/30 11/04 11/04
30 4/13 3/25 4/01 5/01 5/07 10/20 10/02 10/07 11/04 11/20
28 4/10 3/23 3/31 4/30 5/06 10/23 10/02 10/09 11/08 11/20
24 4/03 3/03 3/17 4/12 4/14 11/07 10/09 10/21 11/23 11/29
20 3/21 2/16 3/05 4/08 4/10 11/16 11/03 11/03 12/05 12/11
16 3/12 2/08 2/15 4/03 4/10 11/30 11/03 11/08 12/13 12/27

Length of Growing Season (Days)

Derived from 1971-2000 Averages

Temp °F Median Shortest 10% 90% Longest
32 174 139 158 189 204
30 193 149 166 210 224
28 198 151 176 214 224
24 218 180 194 246 254
20 242 207 218 265 289
16 258 216 231 295 307

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