Park climate1991–2020 climate normals211 m source elevationNASA POWER

Atmospheric data for a representative coordinate, covering annual cycles of wind, humidity, and daylight.

Siuslaw National Forest Monthly Climate Normals, Temperature, and Precipitation Averages

Name: Siuslaw National Forest monthly climate normals
Creator: NASA POWER

Annual climatology data for Siuslaw National Forest provides a twelve-month look at temperature shifts and precipitation patterns. Based on NASA POWER measurements from 1991 to 2020 at a specific representative point, these records detail average monthly minimums, maximums, and means. Discover the seasonal progression of daylight, relative humidity, and wind speed within this protected landscape in Oregon.

View park overview Browse climate zones

A flat, stylized digital illustration of a coastal landscape with rolling sand dunes, patches of green coastal grass, and a line of evergreen trees in the distance under a pale sky.

Annual climate pattern

Long-term monthly averages tracking thermal ranges and precipitation rates across twelve months

Siuslaw National Forest Annual Climate Normals and Monthly Temperature Patterns

Average monthly temperatures span from winter lows to peak summer maximums across the sampled coordinate within Siuslaw National Forest. Accompanying average daily precipitation rates shift alongside these thermal records based on NASA Power climatology data from 1991 to 2020.

Mean temperatureAverage minimum–maximum rangePrecipitation

Annual mean: 10.1 °C
Warmest month: August
Coolest month: December
Wettest month: December

Twelve-month climate

Track long-term monthly temperature bounds, daily precipitation rates, wind speeds, and calculated daylight hours.

Siuslaw National Forest Weather by Month: Complete Twelve-Month Climate Records

Analyze average minimum, mean, and maximum temperatures alongside average daily precipitation rates across the calendar year at a representative coordinate. Compare relative humidity, wind speed, and calculated daylight duration to understand the complete long-term monthly climate pattern.

	Mean temperature	Precipitation	Humidity	Wind speed	Daylight
January	5.6 °C-2.4° to 12.8°	7.7 mm/day	92.8%	2.9 m/s	9.1 hours
February	6 °C-2.1° to 14.8°	6.2 mm/day	90.3%	2.7 m/s	10.2 hours
March	7.1 °C-0.3° to 17.1°	5.8 mm/day	88.3%	2.6 m/s	11.7 hours
April	8.6 °C1.3° to 20.3°	4.3 mm/day	86.1%	2.5 m/s	13.3 hours
May	11.3 °C3.8° to 23.6°	2.6 mm/day	84.6%	2.3 m/s	14.6 hours
June	13.5 °C6.8° to 25°	1.6 mm/day	84.2%	2.3 m/s	15.3 hours
July	15.6 °C8.6° to 26.4°	0.4 mm/day	83.9%	2.3 m/s	15 hours
August	15.7 °C8.8° to 26.5°	0.6 mm/day	84.5%	2.1 m/s	13.8 hours
September	14.3 °C6.8° to 26.8°	1.7 mm/day	84.5%	2.1 m/s	12.3 hours
October	10.9 °C1.8° to 22.2°	4.2 mm/day	87.2%	2.4 m/s	10.7 hours
November	7.5 °C-1.1° to 16.1°	7.8 mm/day	91.5%	2.7 m/s	9.4 hours
December	5.3 °C-3.1° to 12.9°	8.8 mm/day	92.9%	2.9 m/s	8.7 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: 5.3 °C; August: 15.7 °C; Change from December to August: +10.4 °C
Precipitation: December: 8.8 mm/day; August: 0.6 mm/day; Change from December to August: -8.2 mm/day
Daylight: December: 8.7 hours; August: 13.8 hours; Change from December to August: +5.1 hours

Calculated climate highlights

Warmest, coolest, wettest, and driest periods derived from long-term monthly averages

Calculated Monthly Climate Highlights and Seasonal Contrasts in Siuslaw National Forest

Comparative monthly values across twelve baseline intervals identify high and low points for temperature, precipitation, humidity, wind, and daylight duration at a representative coordinate. Resulting metrics summarize baseline climatology patterns rather than documenting daily weather extremes or uniform conditions across all regional terrain.

Warmest month: August15.7 °C
Coolest month: December5.3 °C
Wettest month: December8.8 mm/day
Driest month: July0.4 mm/day
Most humid month: December92.9%
Windiest month: December2.9 m/s
Longest daylight: June15.3 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

Analyze monthly temperature, precipitation, and regional atmospheric patterns across diverse protected landscapes.

Comparing Siuslaw National Forest Climate Profiles With Other Protected Areas

Examine long-term monthly normals for temperature and precipitation alongside humidity, wind, and daylight metrics across different geographic settings. Systematic data comparison reveals atmospheric variation and environmental patterns without implying shared climatic conditions between protected areas.