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Climate Data for Washington County, Wisconsin
Climate Normals and Growing Season Summary
Chart courtesy of the Midwestern Regional Climate Center.
Growing Season Summary:
- Median date of last frost in the spring: May 10. Last Spring Frost Zones.
- (The last frost occurs on or after May 25 in 10 percent of the years.)
- Median date of first frost in the fall: October 5. First Fall Frost Zones.
- (The first frost occurs on or before September 23 in 10 percent of the years.)
- Median growing season: 155 days. Range: 134 to 165 days.
- For perennials, landscape plantings and fruit trees, see our Map of USDA Plant Hardiness Zones for Wisconsin.
| Climate Normals |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sept |
Oct |
Nov |
Dec |
| Ave Daily High (F°) |
25.3 |
29.7 |
40.7 |
54.8 |
67.6 |
77.1 |
81.6 |
79.2 |
71.4 |
59.4 |
44.6 |
30.4 |
| Ave Daily Low (F°) |
9.1 |
13.3 |
24.1 |
34.5 |
43.9 |
53.3 |
59.2 |
57.6 |
50.1 |
40.0 |
28.9 |
15.6 |
| Growing Degree Days |
0 |
1 |
26 |
115 |
297 |
472 |
619 |
570 |
370 |
170 |
33 |
3 |
| Heating Degree Days |
1482 |
1218 |
1011 |
609 |
313 |
78 |
13 |
32 |
145 |
481 |
846 |
1302 |
| Cooling Degree Days |
0 |
0 |
0 |
0 |
28 |
84 |
180 |
137 |
19 |
6 |
0 |
0 |
| Ave Precipitation (") |
1.21 |
0.93 |
1.95 |
2.93 |
2.92 |
3.51 |
3.79 |
3.80 |
4.13 |
2.66 |
2.44 |
1.72 |
| Ave Snowfall (") |
12.1 |
9.6 |
8.8 |
2.5 |
0.1 |
0.0 |
0.0 |
0.0 |
0.0 |
0.2 |
3.5 |
13.1 |
Data from the weather station at West Bend, latitude 43°42' N, longitude 88°11' W, elevation 940 ft.
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