What is the hottest month in Port Washington?

July is the warmest month in Port Washington, with an average high of 78.7°F.

What is the coldest month in Port Washington?

January is the coldest month in Port Washington, with an average low of 14.6°F.

What month does Port Washington get the most rain?

June is typically the wettest month in Port Washington, with about 4.17 inches of precipitation.

What plant hardiness zone is Port Washington in?

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

Port Washington, WI

Climate overview — based on NOAA 1991-2020 normals from PORT WASHINGTON, WI US.

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

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Port Washington has an annual average temperature of 46.7°F with about 33.9 inches of precipitation per year and 42.3 inches of snow. The warmest month is July (average high 78.7°F), and the coldest is January (average low 14.6°F). June is typically the wettest month (4.17 in) and February the driest (1.48 in). Snow typically falls from November through April.

Pleasant months

4 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

47.4°F

warmest to coldest month

Heating need

6,900

HDD/yr

Cooling need

303

CDD/yr

Best time to visit Port Washington

Full guide →

Climate change signal

All-time records →

0 of 366 (0%) of Port Washington'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		47
1900s		32
1910s		41
1920s		48
1930s		0
1940s		0
1950s		0
1960s		27
1970s		39
1980s		50
1990s		38
2000s		42
2010s		2

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	30.8°F	14.6°F	22.7°F	1.76 in	13.2 in	8
February	33.5°F	15.7°F	24.6°F	1.48 in	10.7 in	7
March	41.9°F	25.4°F	33.7°F	1.91 in	6.0 in	8
April	51.0°F	35.4°F	43.2°F	3.78 in	0.8 in	10
May	61.3°F	44.8°F	53.0°F	3.90 in	—	11
June	71.5°F	54.8°F	63.2°F	4.17 in	—	10
July	78.7°F	61.5°F	70.1°F	3.61 in	—	9
August	78.4°F	61.6°F	70.0°F	3.68 in	—	8
September	71.3°F	53.7°F	62.5°F	3.08 in	—	8
October	59.2°F	41.6°F	50.4°F	2.56 in	—	9
November	46.4°F	30.6°F	38.5°F	2.13 in	0.9 in	8
December	35.8°F	20.5°F	28.2°F	1.82 in	10.7 in	8