What is the hottest month in Watertown?

July is the warmest month in Watertown, with an average high of 81.3°F.

What is the coldest month in Watertown?

January is the coldest month in Watertown, with an average low of 10.5°F.

What month does Watertown get the most rain?

June is typically the wettest month in Watertown, with about 5.80 inches of precipitation.

What plant hardiness zone is Watertown in?

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

Has the climate in Watertown changed recently?

8.2% of Watertown'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.

Watertown, WI

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

Dfb Warm-summer humid continental climate 6b USDA hardiness Zone 6b

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Watertown has an annual average temperature of 46.4°F with about 37.3 inches of precipitation per year and 37 inches of snow. The warmest month is July (average high 81.3°F), and the coldest is January (average low 10.5°F). June is typically the wettest month (5.80 in) and February the driest (1.35 in). Snow typically falls from October through April.

Pleasant months

3 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

52.8°F

warmest to coldest month

Heating need

7,101

HDD/yr

Cooling need

387

CDD/yr

Best time to visit Watertown

Full guide →

Climate change signal

All-time records →

30 of 366 (8.2%) of Watertown'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		18
1900s		12
1910s		16
1920s		23
1930s		47
1940s		54
1950s		28
1960s		13
1970s		25
1980s		32
1990s		27
2000s		23
2010s		30
2020s		18

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	26.4°F	10.5°F	18.4°F	1.37 in	11.0 in	8
February	30.3°F	13.3°F	21.8°F	1.35 in	9.7 in	8
March	42.2°F	24.0°F	33.1°F	1.90 in	4.4 in	8
April	55.6°F	35.1°F	45.4°F	3.67 in	1.6 in	12
May	67.8°F	46.9°F	57.3°F	4.19 in	0.1 in	13
June	77.7°F	57.1°F	67.4°F	5.80 in	—	12
July	81.3°F	61.1°F	71.2°F	4.50 in	—	11
August	79.5°F	59.0°F	69.3°F	4.11 in	—	10
September	72.8°F	50.8°F	61.8°F	3.47 in	—	10
October	59.6°F	39.5°F	49.6°F	3.00 in	0.3 in	11
November	44.6°F	27.9°F	36.2°F	2.14 in	1.4 in	9
December	32.0°F	17.3°F	24.7°F	1.75 in	8.5 in	10