Climate Overview
The climate in Grantsburg Municipal Airport is cool. The average annual temperature is 8°C and approximately 859mm of precipitation falls per year. August is the wettest month, receiving around 122mm of rainfall. Grantsburg Municipal Airport is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, June, August. The coldest months are February, January, December, when temperatures can drop to -12°C. Snowfall occurs from January to December, with around 93cm accumulating over the season.
Temperature
Grantsburg Municipal Airport has a wide annual temperature range, spanning 40°C from the coldest to warmest months. The warmest month is July, when average highs reach 28°C and the mean temperature sits around 22°C. The coldest month is February, when overnight lows fall to -12°C and the daily average is -8°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between April and May, with a 8°C shift in average temperatures.
Precipitation
Grantsburg Municipal Airport is a moderately rainy area, receiving approximately 859mm of precipitation annually, which averages out to around 72mm per month. The wettest month is August, averaging 122mm of rainfall. May and July also tend to see above-average precipitation. The driest month is January, with just 19mm. That's 103mm less than August, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Snowfall is a regular feature from January to December, with around 93cm accumulating over the season. December typically sees the most snow at around 23cm.
Wind
Grantsburg Municipal Airport is mildly breezy, with an average annual wind speed of 18km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 20km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in July, with average winds dropping to 16km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 4km/h between the calmest and windiest months.
Seasons
83 days until Summer
It is currently spring in Grantsburg Municipal Airport, which began on March 20, 2026. Grantsburg Municipal Airport is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 28°C, while the coldest stretch bottoms out in February near -12°C. Summer is next, beginning on June 21, 2026 — 83 days from now.
Spring
Temperatures range from -4 to 21°C. Precipitation is moderate at around 241mm for the season, averaging 80mm per month. Winds are moderate at around 19km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 16 to 28°C. Rainfall is heavy, totalling around 309mm across the season with a monthly average of 103mm. Winds are moderate at around 16km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from -2 to 23°C. Precipitation is moderate at around 213mm for the season, averaging 71mm per month. Expect around 14cm of snow accumulation during this period. Winds are moderate at around 19km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from -12 to -1°C. Rainfall is relatively light, with around 95mm over the season and a monthly average of 32mm. Expect around 51cm of snow accumulation during this period. Winds are moderate at around 18km/h. Heavy layering and insulated outerwear are essential — exposed skin should be minimised outdoors.
Best Time to Visit
The best time to visit Grantsburg Municipal Airport is during June, July and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 92mm per month. By contrast, February can be quite cold with temperatures dropping to -12°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.
Monthly Climate Data
The table below shows monthly climate averages for Grantsburg Municipal Airport based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
