Altamont (IL) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Altamont.
Climate overview of Altamont
Temperatures in Altamont, Illinois, United States of America, vary greatly throughout the year. July is the hottest month at 30°C (86°F), while January is the coldest at 3°C (37°F).
The city receives considerable rain/snowfall, with around 1167 mm (46 in) annually. June is the wettest month. It has very warm summers and cold winters.
Altamont Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Altamont - and find the best time to visit.
Monthly Temperature in Altamont
The climate in Altamont is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a very warm 30°C (86°F) in July to a chilly 3°C (37°F) in the coolest month, January.
Nights vary from 19°C (66°F) in July to around -7°C (19°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Altamont
Altamont has a notably wet climate with abundant precipitation, recording 1167 mm (46 in) of rain/snowfall per year. The climate in Altamont shows significant variation throughout the year. Expect high rainfall in June, the wettest month, with an average of 158 mm (6.2 in) of precipitation over 12 rainy days.
In contrast, the driest month January offers drier and sunnier days, with around 57 mm (2.2 in) of snow/rainfall over 8 snowy/rainy days. For more details, please visit our Altamont Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Altamont
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: September and October
- Warmest weather: June, July and August
- Seasonal pattern: Very warm summers and cold winters
- Coldest conditions: January, with freezing nights around -7°C (19°F).
Frequently asked questions about the climate in Altamont
What is the best time to visit Altamont?
September and October typically offer the most optimal weather in Altamont. In contrast, January, February and December tend to have less optimal conditions. Altamont has very warm summers and cold winters.
What temperatures can I expect in Altamont?
Daytime highs range from 3°C (37°F) in January to 30°C (86°F) in July. Nighttime lows range from -7°C (19°F) to 19°C (66°F). Temperatures vary considerably through the year.
How much rain does Altamont get?
Annual rainfall is around 1167 mm (46 in). June is the wettest month with 158 mm (6.2 in), while January is the driest with 57 mm (2.2 in).
Altamont 3-Day Forecast
Altamont on the map
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