ILLINOIS CLIMATE
Probability of last spring freeze (32° or lower) after date shown by
districts
| Probability
|
NW |
NE* |
W |
C |
E |
WSW |
ESE |
SW |
SE |
| 3 years in 4 |
Apr. 21 |
Apr. 19 |
Apr. 13 |
Apr. 16 |
Apr. 16 |
Apr. 10 |
Apr. 11 |
Apr. 2 |
Apr. 3 |
| 1 year in 2 |
Apr. 30 |
Apr. 28 |
Apr. 22 |
Apr. 25 |
Apr. 25 |
Apr. 19 |
Apr. 20 |
Apr. 11 |
Apr. 12 |
| 1 year in 4 |
May 9 |
May 7 |
May 1 |
May 4 |
May 4 |
Apr. 28 |
Apr. 29 |
Apr. 20 |
Apr. 21 |
| 1 year in 10 |
May 17 |
May 15 |
May 9 |
May 12 |
May 12 |
May 6 |
May 7 |
Apr. 28 |
Apr. 29 |
| 1 year in 20 |
May 22 |
May 20 |
May 14 |
May 17 |
May 17 |
May 11 |
May 12 |
May 3 |
May 4 |
* Last spring freeze averages approximately ten days earlier in Cook
County near Lake Michigan.
Source: Illinois State Water Survey.
Probability of first fall freeze (32° or lower) before date shown by
districts
| Probability |
NW |
NE* |
W |
C |
E |
WSW |
ESE |
SW |
SE |
| 3 years in 4 |
Oct. 17 |
Oct. 18 |
Oct. 25 |
Oct. 26 |
Oct. 25 |
Oct. 28 |
Oct. 28 |
Nov. 3 |
Nov. 4 |
| 1 year in 2 |
Oct. 8 |
Oct. 9 |
Oct. 16 |
Oct. 17 |
Oct. 16 |
Oct. 19 |
Oct. 19 |
Oct. 25 |
Oct. 26 |
| 1 year in 4 |
Sep. 29 |
Sep. 30 |
Oct. 7 |
Oct. 8 |
Oct. 7 |
Oct. 10 |
Oct. 10 |
Oct. 16 |
Oct. 17 |
| 1 year in 10 |
Sep. 22 |
Sep. 23 |
Sep. 30 |
Oct. 1 |
Sep. 30 |
Oct. 3 |
Oct. 3 |
Oct. 9 |
Oct. 10 |
| 1 year in 20 |
Sep. 17 |
Sep. 18 |
Sep. 25 |
Sep. 26 |
Sep. 25 |
Sep. 28 |
Sep. 28 |
Oct. 4 |
Oct. 5 |
*First fall freeze averages approximately ten days later in Cook County
near Lake Michigan. Source: Illinois State Water Survey
MONTHLY PRECIPITATION: Avg. number of inches and departures from long
term means by districts, 1997
Month |
NW |
NE |
W |
C |
E |
WSW |
ESE |
SW |
SE |
| Prec. |
Dep. |
Prec. |
Dep. |
Prec. |
Dep. |
Prec. |
Dep. |
Prec. |
Dep. |
Prec. |
Dep. |
Prec. |
Dep. |
Prec. |
Dep. |
Prec. |
Dep. |
| Jan. |
1.52 |
0.19 |
1.89 |
0.32 |
1.60 |
0.15 |
2.02 |
0.45 |
2.20 |
0.55 |
2.23 |
0.56 |
3.81 |
1.78 |
3.90 |
1.54 |
4.08 |
1.39 |
| Feb. |
3.70 |
2.56 |
4.87 |
3.54 |
4.76 |
3.35 |
4.48 |
2.97 |
3.82 |
2.19 |
3.60 |
1.73 |
3.56 |
1.35 |
3.27 |
0.48 |
2.71 |
-0.34 |
| March |
1.31 |
-1.29 |
1.59 |
-1.09 |
2.10 |
-0.99 |
2.29 |
-0.79 |
2.45 |
-0.54 |
2.68 |
-0.70 |
4.15 |
0.41 |
5.10 |
0.77 |
7.06 |
2.31 |
| April |
1.85 |
-1.83 |
1.84 |
-1.89 |
2.70 |
-1.06 |
2.23 |
-1.52 |
1.84 |
-1.94 |
1.93 |
-1.77 |
1.92 |
-1.91 |
3.78 |
-0.15 |
3.75 |
-0.64 |
| May |
4.27 |
0.39 |
3.75 |
0.11 |
3.93 |
-0.17 |
3.19 |
-0.79 |
4.20 |
0.20 |
3.24 |
-1.04 |
3.38 |
-0.85 |
5.22 |
0.78 |
5.91 |
1.02 |
| June |
3.37 |
-0.81 |
3.08 |
-0.97 |
2.85 |
-1.13 |
2.73 |
-1.09 |
3.80 |
-0.05 |
2.21 |
-1.51 |
4.17 |
0.36 |
4.97 |
1.23 |
5.83 |
1.97 |
| July |
1.83 |
-2.16 |
2.53 |
-1.45 |
2.04 |
-2.35 |
2.26 |
-1.69 |
2.89 |
-1.32 |
1.25 |
-2.66 |
2.48 |
-1.75 |
2.76 |
-1.09 |
2.27 |
-1.78 |
| August |
5.59 |
1.51 |
4.74 |
0.78 |
6.16 |
2.42 |
6.56 |
3.14 |
5.42 |
1.79 |
3.74 |
0.37 |
3.95 |
0.59 |
4.10 |
0.59 |
2.97 |
-0.40 |
| Sept. |
3.02 |
-0.85 |
2.06 |
-1.73 |
2.09 |
-2.19 |
3.14 |
-0.61 |
2.14 |
-1.27 |
2.60 |
-0.90 |
1.95 |
-1.20 |
2.14 |
-1.14 |
1.63 |
-1.45 |
| Oct. |
1.72 |
-1.03 |
2.26 |
-0.24 |
2.31 |
-0.70 |
1.83 |
-0.89 |
1.69 |
-0.95 |
1.68 |
-1.14 |
1.88 |
-0.98 |
2.53 |
-0.43 |
1.84 |
-1.17 |
| Nov. |
1.82 |
-0.67 |
1.75 |
-1.08 |
2.23 |
-0.40 |
2.81 |
0.04 |
2.34 |
-0.57 |
3.62 |
0.56 |
2.47 |
-1.03 |
2.36 |
-1.48 |
2.69 |
-1.32 |
| Dec. |
1.69 |
-0.35 |
1.67 |
-0.71 |
1.71 |
-0.57 |
1.69 |
-0.99 |
1.61 |
-1.17 |
1.95 |
-1.00 |
2.18 |
-1.24 |
2.41 |
-1.36 |
2.85 |
-1.20 |
| Annual |
31.69 |
-4.34 |
32.03 |
-4.41 |
34.48 |
-3.64 |
35.23 |
-1.80 |
34.40 |
-3.08 |
30.73 |
-7.50 |
35.90 |
-4.47 |
42.54 |
-0.26 |
43.59 |
-1.61 |
Source: National Weather Service
MONTHLY TEMPERATURES: Average temperature and departures from long term
means by district, 1997
Month |
NW |
NE |
W |
C |
E |
WSW |
ESE |
SW |
SE |
| Temp. |
Dep. |
Temp. |
Dep. |
Temp. |
Dep. |
Temp. |
Dep. |
Temp. |
Dep. |
Temp. |
Dep. |
Temp. |
Dep. |
Temp. |
Dep. |
Temp. |
Dep. |
| Jan. |
16.0 |
-3.2 |
17.7 |
-3.0 |
18.8 |
-4.4 |
19.0 |
-4.0 |
19.1 |
-3.9 |
21.9 |
-4.0 |
24.0 |
-2.7 |
28.3 |
-2.0 |
28.6 |
-2.0 |
| Feb. |
27.4 |
3.4 |
28.2 |
3.0 |
31.4 |
3.4 |
31.9 |
4.3 |
31.6 |
4.3 |
34.9 |
4.5 |
36.7 |
5.5 |
39.8 |
5.1 |
39.7 |
4.7 |
| March |
38.1 |
1.7 |
37.9 |
1.2 |
41.6 |
1.6 |
41.9 |
2.1 |
41.1 |
1.7 |
44.0 |
1.9 |
45.1 |
2.3 |
48.6 |
2.9 |
48.1 |
2.1 |
| April |
45.1 |
-4.3 |
44.8 |
-3.9 |
47.0 |
-5.6 |
47.1 |
-5.1 |
46.2 |
-5.1 |
48.2 |
-6.0 |
49.6 |
-4.7 |
51.2 |
-5.5 |
50.8 |
-5.9 |
| May |
54.5 |
-6.1 |
53.6 |
-6.0 |
57.2 |
-5.6 |
57.4 |
-5.2 |
56.3 |
-5.8 |
59.1 |
-4.8 |
59.4 |
-4.7 |
61.6 |
-4.1 |
61.1 |
-4.6 |
| June |
69.9 |
0.0 |
68.5 |
-0.8 |
71.0 |
-1.0 |
70.6 |
-1.3 |
69.8 |
-1.7 |
70.9 |
-1.9 |
71.5 |
-1.5 |
72.3 |
-2.0 |
72.1 |
-2.1 |
| July |
72.9 |
-0.9 |
73.0 |
-0.5 |
75.2 |
-0.9 |
74.7 |
-0.6 |
73.7 |
-1.0 |
76.4 |
-0.2 |
76.4 |
-0.1 |
78.4 |
0.3 |
77.2 |
-0.7 |
| August |
68.8 |
-2.6 |
68.8 |
-2.8 |
71.6 |
-1.8 |
70.5 |
-2.5 |
69.1 |
-3.2 |
72.5 |
-1.6 |
72.4 |
-1.9 |
74.5 |
-1.5 |
74.2 |
-1.8 |
| Sept. |
64.1 |
0.3 |
64.3 |
-0.1 |
66.7 |
0.4 |
66.2 |
-0.1 |
65.1 |
-0.9 |
67.5 |
0.0 |
67.7 |
-0.2 |
68.9 |
-0.4 |
68.5 |
-1.0 |
| Oct. |
52.6 |
0.3 |
52.9 |
0.0 |
55.1 |
0.2 |
54.5 |
0.0 |
53.6 |
-0.4 |
56.1 |
0.1 |
56.2 |
0.1 |
57.9 |
-0.1 |
57.2 |
-0.7 |
| Nov. |
35.5 |
-3.4 |
36.3 |
-3.8 |
37.9 |
-3.9 |
38.1 |
-3.6 |
37.5 |
-4.1 |
39.6 |
-4.1 |
39.9 |
-4.3 |
42.6 |
-3.9 |
42.1 |
-4.8 |
| Dec. |
28.6 |
3.8 |
30.4 |
3.9 |
30.4 |
2.2 |
31.3 |
3.0 |
31.1 |
2.6 |
32.9 |
1.9 |
33.4 |
1.5 |
35.9 |
1.0 |
35.7 |
0.3 |
| Annual |
47.8 |
-0.8 |
48.0 |
-1.0 |
50.3 |
-1.2 |
50.3 |
-1.0 |
49.5 |
-1.4 |
52.0 |
-1.1 |
52.7 |
-0.8 |
55.0 |
-0.8 |
54.6 |
-1.3 |
Source: National Weather Service
Illinois Agricultural Statistics Service
Annual Summary - 1998 |
Page 17 |
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