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Snow covers much of the park mid October through early June. The Lassen Park Road (the main road that connects Highway 89) is usually closed late October through early June. Many of the main park attractions are snow covered and inaccessible by car and foot. July, August, and September may bring mostly sunny skies with warm daytime temperatures and cold nighttime temperatures.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual | |
| Avg High - �F | 41.0 | 42.8 | 44.8 | 51.3 | 60.4 | 69.6 | 78.7 | 77.4 | 71.2 | 60.5 | 47.6 | 42.0 | 57.3 |
| Avg Low - �F | 20.1 | 21.1 | 22.8 | 27.7 | 34.4 | 41.0 | 45.5 | 44.2 | 40.2 | 34.0 | 26.9 | 22.0 | 31.7 |
| Avg Precip (in) | 6.60 | 5.59 | 5.49 | 3.44 | 2.89 | 1.67 | 0.39 | 0.65 | 1.37 | 3.12 | 5.33 | 5.94 | 42.48 |
| Avg Snowfall (in) | 27.4 | 33.9 | 35.7 | 21.1 | 8.2 | 1.3 | 0.0 | 0.0 | 0.4 | 3.2 | 18.3 | 31.5 | 191.0 |
| Avg Snow Depth (in) | 19.0 | 24.0 | 23.0 | 12.0 | 2.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 3.0 | 10.0 | 8.0 |
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This site is in no way associated with the United States Government, the Department of the Interior or the National Park Service
