Climate Overview
The climate in Iron Mountain is cool. The average annual temperature is 6°C and approximately 947mm of precipitation falls per year. Iron Mountain receives a notable amount of rainfall throughout the year, including during its driest month. Iron Mountain is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, February, December, when temperatures can drop to -12°C. Iron Mountain experiences heavy snowfall, typically from January through December.
Temperature
Iron Mountain has a wide annual temperature range, spanning 39°C from the coldest to warmest months. The warmest month is July, when average highs reach 27°C and the mean temperature sits around 21°C. The coldest month is January, 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 9°C shift in average temperatures.
Precipitation
Iron Mountain is a moderately rainy area, receiving approximately 947mm of precipitation annually, which averages out to around 79mm per month. The wettest month is October, averaging 114mm of rainfall. July and June also tend to see above-average precipitation. The driest month is January, with just 45mm. That's 69mm less than October, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Iron Mountain receives heavy snowfall, accumulating around 202cm annually from January through December. The snowiest month is February, with approximately 41cm. Winter travel should account for significant snow cover.
Wind
Iron Mountain is relatively calm, with an average annual wind speed of 3km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 0km/h between the calmest and windiest months.
Seasons
1 day until Summer
It is currently spring in Iron Mountain, which began on March 20, 2026. Iron Mountain 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 27°C, while the coldest stretch bottoms out in January near -12°C. Summer is next, beginning on June 21, 2026 — 1 days from now.
Spring
Temperatures range from -7 to 20°C. Precipitation is moderate at around 227mm for the season, averaging 76mm per month. Winds are generally light, averaging 3km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 12 to 27°C. Rainfall is heavy, totalling around 309mm across the season with a monthly average of 103mm. Winds are generally light, averaging 3km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from -3 to 21°C. Precipitation is moderate at around 271mm for the season, averaging 90mm per month. Expect around 27cm of snow accumulation during this period. Winds are generally light, averaging 3km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from -12 to -2°C. Rainfall is relatively light, with around 141mm over the season and a monthly average of 47mm. Expect around 119cm of snow accumulation during this period. Winds are generally light, averaging 3km/h. Heavy layering and insulated outerwear are essential — exposed skin should be minimised outdoors.
Monthly Climate Data
The table below shows monthly climate averages for Iron Mountain 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.
