Lewiston CDP, California

Official LSAD Designation: Lewiston CDP • Census GEOID: 0641278 • Trinity County

Climate Normals & Weather Observations

30-year climate normals (1991–2020) and weather observations for Lewiston CDP.

Reference Weather Station: TRINITY RVR HATCHERY, CA US (ID: USC00049026) • Located 2.5 miles from community center • Elevation: 567.2 m

Month	Average High (°F)	Average Low (°F)	Mean Temp (°F)	Precipitation (in)
January	50.0°	32.7°	41.4°	5.95"
February	56.0°	32.9°	44.5°	4.71"
March	61.5°	35.4°	48.4°	4.07"
April	67.7°	37.7°	52.7°	2.57"
May	77.3°	44.0°	60.6°	1.69"
June	86.5°	48.6°	67.6°	0.86"
July	95.6°	54.0°	74.8°	0.19"
August	94.4°	51.9°	73.1°	0.14"
September	88.8°	45.6°	67.2°	0.33"
October	75.6°	38.6°	57.1°	1.94"
November	58.4°	35.6°	47.0°	3.50"
December	48.2°	32.3°	40.2°	6.45"

2010–2025, completed calendar years only.

NOAA station TRINITY RVR HATCHERY, CA US (ID: USC00049026) • 2.5 miles from community center .

This is the same reference station used for monthly normals.

Show annual mean of daily highs and lows

Annual mean Annual mean of daily highs Annual mean of daily lows

Annual temperature data table (°F)

Annual station temperatures, 2010–2025. Unavailable means no reported value.
Year	Annual mean (°F)	Annual mean of daily highs (°F)	Annual mean of daily lows (°F)
2010	54.7	68.2	41.1
2011	53.7	68.1	39.3
2012	55.2	70.3	40.2
2013	Unavailable	Unavailable	Unavailable
2014	Unavailable	Unavailable	43.7
2015	Unavailable	Unavailable	42.5
2016	56.7	71.3	42.1
2017	56.3	71.5	41.2
2018	Unavailable	Unavailable	Unavailable
2019	56.1	71.7	40.4
2020	57.1	73.9	40.3
2021	58.0	73.8	42.2
2022	57.9	75.0	40.7
2023	56.4	70.7	42.2
2024	57.8	72.9	42.7
2025	58.9	74.0	43.8

Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.