Lassen County climate

Lassen County Weather in May

NOAA 1991-2020 normals for Susanville 2SW, 29.2 km from Lassen County

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 daily high and low temperature at Lassen County, in °F, with the record for each date.020406080100151015202530
  • 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.

DateNormal highNormal lowRecord highRecord lowChance wet
May 165°F37°F89°F 194721°F 196711%
May 266°F37°F86°F 191423°F 195311%
May 366°F37°F86°F 191423°F 196511%
May 466°F37°F85°F 191420°F 195911%
May 566°F38°F86°F 193124°F 196011%
May 667°F38°F87°F 199020°F 196811%
May 767°F38°F86°F 197425°F 197711%
May 867°F38°F86°F 196923°F 195011%
May 968°F39°F87°F 196920°F 194811%
May 1068°F39°F88°F 193423°F 195311%
May 1168°F39°F86°F 193422°F 195311%
May 1268°F39°F88°F 195925°F 190911%
May 1369°F40°F90°F 192724°F 194711%
May 1469°F40°F91°F 192724°F 191111%
May 1569°F40°F92°F 192724°F 195911%
May 1669°F40°F89°F 198724°F 191711%
May 1770°F41°F93°F 200828°F 196011%
May 1870°F41°F96°F 195425°F 197711%
May 1970°F41°F91°F 191426°F 196011%
May 2070°F41°F90°F 191420°F 202511%
May 2171°F41°F92°F 196727°F 190511%
May 2271°F42°F92°F 196724°F 196011%
May 2371°F42°F90°F 193629°F 195511%
May 2471°F42°F91°F 192829°F 196811%
May 2572°F42°F90°F 193624°F 195511%
May 2672°F43°F91°F 195129°F 190810%
May 2772°F43°F91°F 198325°F 195310%
May 2872°F43°F92°F 198328°F 194810%
May 2973°F43°F93°F 198329°F 197610%
May 3073°F43°F96°F 191430°F 197910%
May 3173°F44°F96°F 198632°F 192910%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Lassen County, in percent.02.557.51012.51102030
  • 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

Every day of May: sun and moon

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.