What is the hottest month in Deerfield?

July is the warmest month in Deerfield, with an average high of 83.5°F.

What is the coldest month in Deerfield?

January is the coldest month in Deerfield, with an average low of 11.4°F.

What month does Deerfield get the most rain?

June is typically the wettest month in Deerfield, with about 5.11 inches of precipitation.

What plant hardiness zone is Deerfield in?

Deerfield is approximately in USDA plant hardiness Zone 6b, based on the average annual extreme minimum temperature.

Has the climate in Deerfield changed recently?

14.5% of Deerfield's all-time daily heat records were set in the last decade (since 2015), compared to roughly 5% if records were evenly distributed over time.

Deerfield, WI

Climate overview — based on NOAA 1991-2020 normals from LAKE MILLS WWTP, WI US.

Dfa Hot-summer humid continental climate 6b USDA hardiness Zone 6b

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Deerfield has an annual average temperature of 47.4°F with about 37 inches of precipitation per year and 42.3 inches of snow. The warmest month is July (average high 83.5°F), and the coldest is January (average low 11.4°F). June is typically the wettest month (5.11 in) and January the driest (1.41 in). Snow typically falls from October through April.

Pleasant months

2 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

53.9°F

warmest to coldest month

Heating need

6,870

HDD/yr

Cooling need

537

CDD/yr

Best time to visit Deerfield

Full guide →

Climate change signal

All-time records →

53 of 366 (14.5%) of Deerfield's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.

1890s		26
1900s		19
1910s		29
1920s		19
1930s		57
1940s		16
1950s		20
1960s		10
1970s		12
1980s		36
1990s		20
2000s		23
2010s		49
2020s		30

Bars: number of all-time daily heat records still standing that were set in each decade.

Monthly averages

Month	Avg High	Avg Low	Avg Temp	Precipitation	Snow	Rainy days
January	26.8°F	11.4°F	19.1°F	1.41 in	10.7 in	8
February	31.1°F	14.1°F	22.6°F	1.52 in	11.4 in	7
March	43.2°F	24.6°F	33.9°F	2.03 in	4.9 in	7
April	57.0°F	35.9°F	46.4°F	3.59 in	2.1 in	10
May	69.5°F	47.7°F	58.6°F	4.39 in	0.1 in	12
June	79.8°F	58.4°F	69.1°F	5.11 in	—	12
July	83.5°F	62.4°F	73.0°F	4.37 in	—	9
August	81.0°F	60.6°F	70.8°F	4.50 in	—	9
September	74.0°F	51.7°F	62.9°F	3.47 in	—	9
October	60.8°F	40.2°F	50.5°F	2.82 in	0.2 in	10
November	45.2°F	28.5°F	36.9°F	2.12 in	2.0 in	8
December	32.3°F	18.0°F	25.1°F	1.65 in	10.9 in	9