Updated October 2026
Lassen Volcanic National Park Weather by Month
Lassen Volcanic National Park is warmest in July, when the nearest NOAA climate station averages a high of 79°F and a low of 46°F, and coldest in February, with an average high of 42°F and an average low of 22°F. January and December are the wettest months, with about 6.5 inches of precipitation each.
These figures are NOAA's 1991–2020 climate normals, the 30-year average for each calendar month, from the nearest long-record weather station, 9.5 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Lassen Volcanic National Park can differ from these, particularly with elevation.
Warmest month
Jul
79°F avg high
Coldest month
Feb
22°F avg low
Longest days
Jun
14.9 h of daylight
Average weather at Lassen Volcanic by month
| Month | Avg high | Avg low | Precipitation | Daylight |
|---|---|---|---|---|
| January | 41°F | 22°F | 6.5 in | 9.4 h |
| February | 42°F | 22°F | 5.5 in | 10.4 h |
| March | 46°F | 24°F | 6.4 in | 11.7 h |
| April | 50°F | 28°F | 4.3 in | 13.1 h |
| May | 61°F | 35°F | 2.9 in | 14.3 h |
| June | 70°F | 41°F | 1.3 in | 14.9 h |
| July | 79°F | 46°F | 0.3 in | 14.6 h |
| August | 78°F | 45°F | 0.3 in | 13.6 h |
| September | 72°F | 41°F | 0.7 in | 12.3 h |
| October | 59°F | 33°F | 2.7 in | 10.9 h |
| November | 47°F | 26°F | 4.7 in | 9.7 h |
| December | 40°F | 22°F | 6.5 in | 9.1 h |
| Year total | 42.1 in |
NOAA 1991–2020 climate normals from station USC00045311, 9.5 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Lassen Volcanic is at that time of year.
Lassen Volcanic weather by season
Winter: December to February
Average highs hold near 41°F in all three months, with average lows near 22°F. The average low is at or below freezing in all three months. Together the three months average 18.5 inches of precipitation, about 44% of the yearly total and more than in any other season. Daylight is at its shortest, about 9.1 hours in December.
Spring: March to May
Average highs climb from 46°F in March to 61°F in May, with average lows between 24°F and 35°F. The average low is at or below freezing in March and April. Together the three months average 13.6 inches of precipitation, about 32% of the yearly total. Daylight lengthens from about 11.7 hours in March to 14.3 in May.
Summer: June to August
Average highs peak at 79°F in July, between 70°F in June and 78°F in August, with average lows between 41°F and 46°F. Together the three months average 1.9 inches of precipitation, about 5% of the yearly total and less than in any other season. Daylight is at its longest, about 14.9 hours in June.
Fall: September to November
Average highs fall from 72°F in September to 47°F in November, with average lows between 26°F and 41°F. The average low is at or below freezing in November. Together the three months average 8.1 inches of precipitation, about 19% of the yearly total. Daylight shortens from about 12.3 hours in September to 9.7 in November.
What the National Park Service says about the weather
Weather at Lassen can vary dramatically throughout the year. Average January temperatures are a high of 40.4 °F (4.7 °C) and a low of 20.8 °F (-6.2 °C). Average July temperatures are a high of 88.4 °F and a low of 49.8 °F. Temperatures reach 90 °F or higher on an average of 36.9 days, and drop to 32 ° or lower on an average of 164 days days annually.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Lassen Volcanic
Averages describe a typical month, not this week. For current conditions and the seven-day outlook, the National Weather Service issues a forecast for the park's reference point at 40.49°N, 121.41°W. It covers that one spot, so other elevations in the park can differ from it, as they do from the averages above.
National Weather Service forecast for Lassen Volcanic National Park →
Weather and crowds together
July is both the warmest month and the busiest, with about 2.8× the visitors of the park's average month. February is the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit Lassen Volcanic National Park. For hotels, cabins and rentals close to the park, see where to stay near Lassen Volcanic.
Where to stay near Lassen Volcanic
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Frequently Asked Questions
July is the warmest month at Lassen Volcanic National Park, with an average high of 79°F and an average low of 46°F. That is the 1991–2020 average at the nearest long-record NOAA station, 9.5 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
February is the coldest month at Lassen Volcanic National Park, with an average low of 22°F and an average high of 42°F, based on NOAA 1991–2020 climate normals.
January and December are the wettest months, with about 6.5 inches of precipitation each. July and August are the driest, at about 0.3 inches each. The station records about 42.1 inches of precipitation in an average year.
Daylight at Lassen Volcanic National Park runs from about 9.1 hours a day in December to about 14.9 hours in June, computed from the park's latitude.
Weather at nearby parks
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Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00045311), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (1979–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.