What is the hottest month in Portage?

July is the warmest month in Portage, with an average high of 81.6°F.

What is the coldest month in Portage?

January is the coldest month in Portage, with an average low of 9.9°F.

What month does Portage get the most rain?

June is typically the wettest month in Portage, with about 5.61 inches of precipitation.

What plant hardiness zone is Portage in?

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

Has the climate in Portage changed recently?

9.8% of Portage'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.

Portage, WI

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

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

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Portage has an annual average temperature of 46.5°F with about 38.3 inches of precipitation per year and 39.3 inches of snow. The warmest month is July (average high 81.6°F), and the coldest is January (average low 9.9°F). June is typically the wettest month (5.61 in) and February the driest (1.41 in). Snow typically falls from October through April.

Pleasant months

3 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

53.6°F

warmest to coldest month

Heating need

7,098

HDD/yr

Cooling need

423

CDD/yr

Best time to visit Portage

Full guide →

Climate change signal

All-time records →

36 of 366 (9.8%) of Portage'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.

1880s		0
1890s		4
1900s		18
1910s		38
1920s		28
1930s		72
1940s		13
1950s		31
1960s		15
1970s		14
1980s		31
1990s		21
2000s		27
2010s		30
2020s		24

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	26.1°F	9.9°F	18.0°F	1.44 in	10.2 in	9
February	30.6°F	13.2°F	21.9°F	1.41 in	10.0 in	8
March	42.4°F	24.0°F	33.2°F	2.18 in	5.5 in	9
April	55.7°F	35.8°F	45.8°F	4.15 in	2.2 in	12
May	68.2°F	47.8°F	58.0°F	4.58 in	—	13
June	77.9°F	57.9°F	67.9°F	5.61 in	—	12
July	81.6°F	61.6°F	71.6°F	4.51 in	—	10
August	79.9°F	59.4°F	69.6°F	4.12 in	—	10
September	72.6°F	50.7°F	61.6°F	3.56 in	—	10
October	59.3°F	39.0°F	49.2°F	2.86 in	0.5 in	10
November	44.2°F	28.3°F	36.3°F	2.22 in	2.0 in	8
December	31.8°F	17.1°F	24.4°F	1.68 in	8.9 in	10