Park climate1991–2020 climate normals102 m source elevationNASA POWER

Analyzing long-term atmospheric patterns and daylight cycles at a representative coordinate.

Tongass National Forest Monthly Climate Normals: Temperature, Precipitation, and Wind Data

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

Examine the twelve-month climatology for Tongass National Forest, based on NASA POWER records from 1991 to 2020 at a fixed 102 meter elevation point. These datasets provide structured averages for minimum, mean, and maximum temperatures alongside daily precipitation rates, relative humidity, wind speed, and daylight hours. Consistent metrics reveal the annual progression of regional atmospheric conditions across every month of the calendar year.

View park overview Browse climate zones

An illustration in a flat, vector-art style showing a waterfall flowing down a rocky cliff into a lake, framed by tall evergreen trees in the foreground.

Annual climate pattern

Long term monthly averages tracking twelve month thermal ranges alongside average daily precipitation rates

Tongass National Forest Annual Climate Normals: Monthly Average Temperatures and Precipitation Patterns

Average monthly temperatures across Tongass National Forest move from sub-zero winter minimums to peak summer maximums in August, establishing a clear annual thermal progression for this representative coordinate. Long term climatology records also track average daily precipitation rates through each month, providing a baseline of environmental normals without reflecting live weather conditions.

Mean temperatureAverage minimum–maximum rangePrecipitation

Annual mean: 6.6 °C
Warmest month: August
Coolest month: January
Wettest month: October

Twelve-month climate

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

Tongass National Forest Weather by Month: Complete Twelve-Month Climate Comparison

Examine long-term climate normals across all twelve months at a representative coordinate within Tongass National Forest. Compare temperature variations, average daily precipitation, wind speeds, and calculated daylight hours to understand annual meteorological patterns.

	Mean temperature	Precipitation	Humidity	Wind speed	Daylight
January	1 °C-9° to 6.4°	7.4 mm/day	88.5%	6.8 m/s	7.1 hours
February	1.4 °C-6.5° to 6°	6.2 mm/day	86%	6.3 m/s	9.1 hours
March	2 °C-5.8° to 6.8°	5.3 mm/day	83.1%	6.2 m/s	11.5 hours
April	4.9 °C0.1° to 10.7°	4.6 mm/day	83.2%	5.2 m/s	14 hours
May	7.9 °C3.6° to 14.2°	3.9 mm/day	84.5%	4.5 m/s	16.3 hours
June	10.7 °C6.9° to 17°	3.5 mm/day	86.3%	3.9 m/s	17.6 hours
July	12.8 °C9.7° to 17.7°	4.4 mm/day	88.8%	3.8 m/s	16.9 hours
August	13.4 °C10.5° to 18.1°	6.1 mm/day	88.6%	4.2 m/s	14.9 hours
September	11.3 °C7.4° to 15.5°	9.1 mm/day	86.7%	5.2 m/s	12.4 hours
October	7.7 °C3° to 12°	9.9 mm/day	85.1%	6.1 m/s	9.9 hours
November	3.9 °C-3.6° to 8.5°	8.8 mm/day	86%	6.8 m/s	7.6 hours
December	2.3 °C-6° to 7°	8.8 mm/day	87.1%	7 m/s	6.4 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: January: 1 °C; August: 13.4 °C; Change from January to August: +12.4 °C
Precipitation: January: 7.4 mm/day; August: 6.1 mm/day; Change from January to August: -1.3 mm/day
Daylight: January: 7.1 hours; August: 14.9 hours; Change from January to August: +7.8 hours

Calculated climate highlights

Comparative monthly averages for temperature, precipitation, wind, and daylight duration across the park.

Tongass National Forest Calculated Monthly Climate Highlights and Extremes

Calculated monthly normals identify the warmest, coolest, wettest, and driest periods derived from long term station records at a representative coordinate. These comparative metrics summarize annual patterns across multiple measured variables without representing historical weather extremes.

Warmest month: August13.4 °C
Coolest month: January1 °C
Wettest month: October9.9 mm/day
Driest month: June3.5 mm/day
Most humid month: July88.8%
Windiest month: December7 m/s
Longest daylight: June17.6 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 daylight patterns across distinct geographic settings.

Comparing Tongass National Forest Climate Profiles with Other Protected Areas

Standardized monthly climate normals allow researchers to examine long-term temperature rhythms and precipitation totals across diverse protected landscapes. Reviewing multiple park profiles provides broader context for atmospheric variation, regional terrain differences, and annual meteorological patterns.