Old Mammoth Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Old Mammoth.
Climate overview of Old Mammoth
Old Mammoth, United States of America, sees big temperature differences between seasons, with July peaking at 25°C (77°F) and December dropping to 5°C (41°F).
Old Mammoth sees a moderate amount of rain/snowfall, totalling around 543 mm (21 in) per year. It experiences a distinct dry season from May to October, with warm summers and cold winters, creating some seasonal variation.
Old Mammoth Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Old Mammoth - and find the best time to visit.
Monthly Temperature in Old Mammoth
Visitors to Old Mammoth can expect significant temperature changes throughout the year. Average maximum daytime temperatures range from a comfortable 25°C (77°F) in July, the warmest time of the year, to a chilly 5°C (41°F) during cooler months like December.
At night, you can expect temperatures ranging from 8°C (46°F) in July to around -9°C (16°F) during December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Old Mammoth
Generally, Old Mammoth experiences moderate precipitation patterns, averaging 543 mm (21 in) yearly. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, December it receives high snowfall, averaging 111 mm (4.4 in) of precipitation, recorded across 9 snowy days. In contrast, the driest month September brings less rainfall, with 6.1 mm (0.2 in) over 2 rainy days. For more details, please visit our Old Mammoth 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 Old Mammoth
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: June, July, August and September
- Warmest weather: July and August
- Fewest rainy days: June, August and September
- Wettest months: January, February, March and December, when rainfall is highest.
- Seasonal pattern: A distinct dry season from May to October, with warm summers and cold winters
- Coldest conditions: December, with freezing nights around -9°C (16°F).
Frequently asked questions about the climate in Old Mammoth
What is the best time to visit Old Mammoth?
June, July, August and September typically offer the most optimal weather in Old Mammoth. In contrast, January, February, March, November and December tend to have less optimal conditions. Old Mammoth has a distinct dry season from May to October, with warm summers and cold winters.
What temperatures can I expect in Old Mammoth?
Daytime highs range from 5°C (41°F) in December to 25°C (77°F) in July. Nighttime lows range from -9°C (16°F) to 8°C (46°F). Temperatures vary considerably through the year.
How much rain does Old Mammoth get?
Annual rainfall is around 543 mm (21 in). December is the wettest month with 111 mm (4.4 in), while September is the driest with 6.1 mm (0.2 in). In the coldest months, precipitation may fall as snow.
Old Mammoth 3-Day Forecast
Old Mammoth on the map
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