Park climate1991–2020 climate normals983 m source elevationNASA POWER

Twelve-month statistical analysis of temperature, precipitation, and wind patterns.

San Bernardino National Forest Climate Normals: Long-term Monthly Atmospheric Patterns

Name: San Bernardino National Forest monthly climate normals
Creator: NASA POWER

The climate profile for San Bernardino National Forest presents long-term monthly averages based on NASA POWER data from 1991 to 2020. Measurements include mean, minimum, and maximum temperatures alongside daily precipitation, relative humidity, wind speed, and daylight hours at a single representative location at 983.24 meters of elevation. These records provide a consistent look at annual environmental patterns while reflecting point-specific conditions rather than broad regional weather forecasts.

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A graphic illustration featuring steep mountains, a waterfall cascading into a winding river, and surrounding evergreen pine trees in a soft, pastel color palette.

Annual climate pattern

Long-term monthly temperature averages and average daily precipitation rates recorded across twelve calendar months

San Bernardino National Forest Annual Climate Normals, Temperature Range, and Monthly Precipitation Patterns

Average monthly temperatures span from winter lows in December to peak warmth in July and August, charting the thermal rhythm across the year. The records reflect long-term monthly climate normals for one representative coordinate and track concurrent average daily precipitation rates.

Mean temperatureAverage minimum–maximum rangePrecipitation

Annual mean: 16.4 °C
Warmest month: August
Coolest month: December
Wettest month: February

Twelve-month climate

Track average temperature bounds, precipitation rates, humidity, wind speed, and calculated daylight across the calendar year.

San Bernardino National Forest Weather by Month: Complete Twelve Month Climate Comparison

Examine the twelve month climate record for San Bernardino National Forest to evaluate long term temperature bounds, average daily precipitation rates, and atmospheric humidity. Compare monthly wind speeds and calculated daylight hours across the calendar year to understand baseline climatological patterns at a representative coordinate.

	Mean temperature	Precipitation	Humidity	Wind speed	Daylight
January	8.4 °C-2.4° to 22.7°	1.4 mm/day	53.6%	3 m/s	10 hours
February	9.1 °C-1.8° to 23.4°	1.6 mm/day	56.7%	3.1 m/s	10.8 hours
March	11.5 °C-0.9° to 27.1°	0.9 mm/day	54.9%	3.2 m/s	11.8 hours
April	13.8 °C0.9° to 31.2°	0.4 mm/day	51.2%	3.4 m/s	12.9 hours
May	17.7 °C4.8° to 34.7°	0.2 mm/day	48.5%	3.3 m/s	13.8 hours
June	22.3 °C7.5° to 38.5°	0.1 mm/day	38.6%	3.1 m/s	14.2 hours
July	26.1 °C12.2° to 40.8°	0.3 mm/day	34.4%	2.7 m/s	14 hours
August	26.3 °C12.3° to 40.2°	0.3 mm/day	32.6%	2.6 m/s	13.2 hours
September	23.5 °C9.3° to 37.9°	0.3 mm/day	36.4%	2.5 m/s	12.2 hours
October	17.8 °C4.7° to 33.4°	0.3 mm/day	40.1%	2.7 m/s	11.1 hours
November	12.1 °C0.2° to 27.7°	0.5 mm/day	43.8%	2.9 m/s	10.2 hours
December	7.9 °C-2.8° to 23°	1 mm/day	51.3%	3 m/s	9.8 hours

Compare two months

See two months side by side and how much they differ. Both use the same 1991–2020 climate normals and NASA POWER data point as the table above, so they show typical conditions, not a forecast.

First month

Second month

Mean temperature: December: 7.9 °C; August: 26.3 °C; Change from December to August: +18.4 °C
Precipitation: December: 1 mm/day; August: 0.3 mm/day; Change from December to August: -0.7 mm/day
Daylight: December: 9.8 hours; August: 13.2 hours; Change from December to August: +3.5 hours

Calculated climate highlights

Comparing long term monthly averages for temperature, precipitation, humidity, wind, and daylight duration.

San Bernardino National Forest Monthly Climate Highlights and Calculated Annual Contrasts

Calculated monthly highlights summarize the high and low points across twelve stored climatology records for San Bernardino National Forest. These comparative figures reflect long term monthly averages rather than observed weather extremes or uniform parkwide conditions.

Warmest month: August26.3 °C
Coolest month: December7.9 °C
Wettest month: February1.6 mm/day
Driest month: June0.1 mm/day
Most humid month: February56.7%
Windiest month: April3.4 m/s
Longest daylight: June14.2 hours

Interactive climate map

National park climate map

Open the climate map to compare monthly temperature, precipitation, and other averages.

Global National Park Climate Map

Other park climates

Explore long-term monthly climate normals and atmospheric patterns across diverse protected landscapes.

Compare San Bernardino National Forest Climate Profiles with Other Protected Areas

Examine standardized monthly temperature, precipitation, humidity, wind, and daylight statistics to evaluate distinct atmospheric rhythms across varied regional settings. Comparing these multi-year environmental records highlights structural variations in regional weather patterns without implying direct climatic equivalence.