Frost Dates for Oconomowoc Wwtp, WI

Elevation: 262 m

Frost Dates

Last Spring Frost (50%) A 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. April 30
First Fall Frost (50%) A 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. October 12

30% Probability

Only a 30% chance of frost remaining by this date. Use these dates for a safer planting window, especially for tender plants sensitive to cold.
Last Spring Frost May 6
First Fall Frost October 6

Hard Freeze (28°F)

Last Spring Hard Freeze April 19
First Fall Hard Freeze October 24
43.10°N, 88.50°W © OpenStreetMap

Growing Season

165 Days April 30 to October 12

USDA Hardiness Zone

Hardiness zones indicate which perennial plants can survive winter in your area. For annual vegetables, frost dates and growing season length matter more than hardiness zone.
Zone 5b

Avg. annual minimum: −15 to −10°F

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Dfa Hot-Summer Continental

Hot summers and cold winters with year-round precipitation. Moderate growing season supports warm-season crops like tomatoes, peppers, and corn. Winter protection extends the harvest.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low Light Frost (32°F) Hard Frost (28°F)
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January28°20°11°
February32°23°14°
March44°34°25°
April56°46°36°
May69°58°47°
June78°68°57°
July82°72°61°
August81°70°60°
September74°63°52°
October61°50°40°
November46°37°29°
December34°26°18°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January2.2
February2.1
March3.1
April4.2
May4.9
June5.2
July5.5
August5.8
September5.3
October3.9
November3.0
December2.5

Sunrise / Sunset

Daylight Central Time (CT) Longest: 15h 12m · Shortest: 8h 48m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Central Time (CT))
Month Sunrise Sunset Daylight
January7:29 AM4:38 PM9h 09m
February6:60 AM5:18 PM10h 18m
March7:14 AM6:53 PM11h 39m
April6:19 AM7:30 PM13h 11m
May5:36 AM8:05 PM14h 29m
June5:19 AM8:29 PM15h 10m
July5:33 AM8:26 PM14h 53m
August6:05 AM7:51 PM13h 46m
September6:40 AM6:57 PM12h 17m
October7:16 AM6:03 PM10h 47m
November6:55 AM4:23 PM9h 28m
December7:25 AM4:15 PM8h 50m

Nearby Stations

Sullivan 3se, WIMay 3 - October 9 Watertown Wwtp, WI April 28 - October 12 Waukesha Wwtp, WI May 1 - October 13 Hartford Wwtp, WI May 8 - October 3 Richfield 3 Ssw, WI April 30 - October 16 Brookfield Wwtp, WI April 30 - October 14

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