Lassen County Weather in May
Average highs run from 65°F on May 1 to 73°F on May 31, and lows from 37°F to 44°F. Normal precipitation for the month is 0.82 in over about 3 wet days.
May day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
May at a glance
- Average high
- 69°F
- Average low
- 40°F
- Precipitation
- 0.82 in
- Record high
- 96°FMay 18, 1954
- Record low
- 20°FMay 4, 1959
- Chance of a freeze
- 84%
- Daylight
- 13 h 58 min to 14 h 53 min
- Cloud cover
- 51%
- Humidity
- 62%
- Dew point
- 36°F
- Wind
- 6.3 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| May 1 | 65°F | 37°F | 89°F 1947 | 21°F 1967 | 11% |
| May 2 | 66°F | 37°F | 86°F 1914 | 23°F 1953 | 11% |
| May 3 | 66°F | 37°F | 86°F 1914 | 23°F 1965 | 11% |
| May 4 | 66°F | 37°F | 85°F 1914 | 20°F 1959 | 11% |
| May 5 | 66°F | 38°F | 86°F 1931 | 24°F 1960 | 11% |
| May 6 | 67°F | 38°F | 87°F 1990 | 20°F 1968 | 11% |
| May 7 | 67°F | 38°F | 86°F 1974 | 25°F 1977 | 11% |
| May 8 | 67°F | 38°F | 86°F 1969 | 23°F 1950 | 11% |
| May 9 | 68°F | 39°F | 87°F 1969 | 20°F 1948 | 11% |
| May 10 | 68°F | 39°F | 88°F 1934 | 23°F 1953 | 11% |
| May 11 | 68°F | 39°F | 86°F 1934 | 22°F 1953 | 11% |
| May 12 | 68°F | 39°F | 88°F 1959 | 25°F 1909 | 11% |
| May 13 | 69°F | 40°F | 90°F 1927 | 24°F 1947 | 11% |
| May 14 | 69°F | 40°F | 91°F 1927 | 24°F 1911 | 11% |
| May 15 | 69°F | 40°F | 92°F 1927 | 24°F 1959 | 11% |
| May 16 | 69°F | 40°F | 89°F 1987 | 24°F 1917 | 11% |
| May 17 | 70°F | 41°F | 93°F 2008 | 28°F 1960 | 11% |
| May 18 | 70°F | 41°F | 96°F 1954 | 25°F 1977 | 11% |
| May 19 | 70°F | 41°F | 91°F 1914 | 26°F 1960 | 11% |
| May 20 | 70°F | 41°F | 90°F 1914 | 20°F 2025 | 11% |
| May 21 | 71°F | 41°F | 92°F 1967 | 27°F 1905 | 11% |
| May 22 | 71°F | 42°F | 92°F 1967 | 24°F 1960 | 11% |
| May 23 | 71°F | 42°F | 90°F 1936 | 29°F 1955 | 11% |
| May 24 | 71°F | 42°F | 91°F 1928 | 29°F 1968 | 11% |
| May 25 | 72°F | 42°F | 90°F 1936 | 24°F 1955 | 11% |
| May 26 | 72°F | 43°F | 91°F 1951 | 29°F 1908 | 10% |
| May 27 | 72°F | 43°F | 91°F 1983 | 25°F 1953 | 10% |
| May 28 | 72°F | 43°F | 92°F 1983 | 28°F 1948 | 10% |
| May 29 | 73°F | 43°F | 93°F 1983 | 29°F 1976 | 10% |
| May 30 | 73°F | 43°F | 96°F 1914 | 30°F 1979 | 10% |
| May 31 | 73°F | 44°F | 96°F 1986 | 32°F 1929 | 10% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- May 1
- sunrise 6:01 AM, sunset 7:59 PM
- May 31
- sunrise 5:34 AM, sunset 8:27 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00048702 (Susanville 2SW), public domain. Records: NOAA GHCN-Daily, station USC00048702, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.