What is the hottest month in Superior?

July is the warmest month in Superior, with an average high of 76.1°F.

What is the coldest month in Superior?

January is the coldest month in Superior, with an average low of 5.8°F.

What month does Superior get the most rain?

June is typically the wettest month in Superior, with about 4.56 inches of precipitation.

What plant hardiness zone is Superior in?

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

Has the climate in Superior changed recently?

12.8% of Superior'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.

Superior, WI

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

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

Year-round temperatures (°F)

Avg high Avg low

Climate summary

Superior has an annual average temperature of 41.4°F with about 31.5 inches of precipitation per year and 56 inches of snow. The warmest month is July (average high 76.1°F), and the coldest is January (average low 5.8°F). June is typically the wettest month (4.56 in) and January the driest (0.81 in). Snow typically falls from October through April.

Pleasant months

3 / 12

avg high 65–80°F, low ≥ 50°F

Annual swing

53°F

warmest to coldest month

Heating need

8,592

HDD/yr

Cooling need

105

CDD/yr

Best time to visit Superior

Full guide →

Climate change signal

All-time records →

47 of 366 (12.8%) of Superior'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.

1900s		0
1910s		24
1920s		20
1930s		29
1940s		38
1950s		46
1960s		44
1970s		22
1980s		31
1990s		28
2000s		24
2010s		30
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	22.5°F	5.8°F	14.1°F	0.81 in	14.5 in	7
February	26.9°F	9.1°F	18.0°F	0.89 in	12.4 in	6
March	36.1°F	21.0°F	28.5°F	1.41 in	9.1 in	7
April	46.0°F	31.8°F	38.9°F	2.64 in	1.7 in	9
May	57.4°F	40.9°F	49.1°F	3.37 in	—	12
June	67.0°F	49.5°F	58.2°F	4.56 in	—	12
July	76.1°F	58.0°F	67.1°F	3.88 in	—	10
August	74.8°F	58.0°F	66.4°F	3.92 in	—	10
September	66.6°F	50.1°F	58.4°F	3.39 in	—	10
October	53.0°F	38.6°F	45.8°F	3.17 in	0.2 in	10
November	39.1°F	25.6°F	32.4°F	2.12 in	5.8 in	8
December	27.3°F	13.1°F	20.2°F	1.29 in	12.3 in	7