Park climate1991–2020 climate normals1,533 m source elevationNASA POWER

Review long-term annual patterns for temperature, precipitation, humidity, wind, and daylight hours.

Helena-Lewis and Clark National Forest Monthly Climate Normals and Atmospheric Data Profiles

Name: Helena-Lewis and Clark National Forest monthly climate normals
Creator: NASA POWER

Analyze the twelve-month climate profile for Helena-Lewis and Clark National Forest, Montana, based on NASA POWER records from 1991 to 2020. This dataset provides standardized monthly averages for daily temperatures, precipitation rates, relative humidity, wind speed, and daylight duration at a representative coordinate. These measurements represent long-term regional climatology rather than real-time weather forecasts or current conditions.

View park overview Browse climate zones

A digital illustration of a mountainous landscape with a tall waterfall cascading into a river, surrounded by evergreen trees, with stylized cliffs and a setting sun in the background.

Annual climate pattern

Long-term monthly averages tracking temperature ranges and daily precipitation rates across the calendar year

Helena-Lewis and Clark National Forest Annual Climate Normals and Monthly Temperature Patterns

Helena-Lewis and Clark National Forest experiences an annual temperature rhythm where monthly averages range from sub-zero winter minimums to mid-summer maximums across the representative coordinate. Average daily precipitation rates shift across the twelve-month climatology period, providing a baseline comparison for long-term regional conditions.

Mean temperatureAverage minimum–maximum rangePrecipitation

Annual mean: 4.6 °C
Warmest month: July
Coolest month: January
Wettest month: June

Twelve-month climate

Compare average temperature bounds, daily precipitation rates, humidity, wind speed, and daylight hours across the calendar year.

Helena-Lewis and Clark National Forest Monthly Climate: Twelve-Month Temperature and Precipitation Records

Evaluating twelve months of long-term climate normals provides a precise look at how temperature bounds, precipitation rates, and wind shift across the calendar year at a representative Montana coordinate. Analyzing these multi-variable records alongside relative humidity and calculated daylight hours reveals distinct environmental patterns rather than isolated seasonal averages.

	Mean temperature	Precipitation	Humidity	Wind speed	Daylight
January	-6.9 °C-23.7° to 3.4°	1.1 mm/day	90.3%	4 m/s	8.8 hours
February	-5.8 °C-21.9° to 7°	1.1 mm/day	85.7%	3.7 m/s	10 hours
March	-1 °C-15.7° to 14.1°	1.3 mm/day	75.5%	3.5 m/s	11.7 hours
April	3.2 °C-8.6° to 20.2°	2.1 mm/day	69.7%	3.2 m/s	13.4 hours
May	8.8 °C-4.5° to 25.2°	2.5 mm/day	65.9%	2.8 m/s	14.9 hours
June	13.5 °C0.9° to 29.4°	3 mm/day	64.2%	2.7 m/s	15.7 hours
July	18.4 °C5.3° to 32.5°	1.5 mm/day	56.3%	2.4 m/s	15.3 hours
August	17.6 °C4.3° to 32.2°	1.3 mm/day	54.1%	2.4 m/s	14 hours
September	11.7 °C-2.2° to 28.7°	1.4 mm/day	59.9%	2.7 m/s	12.3 hours
October	4.2 °C-8.7° to 22.1°	1.3 mm/day	69.4%	3.3 m/s	10.6 hours
November	-2 °C-15.5° to 12.1°	1.2 mm/day	78.7%	3.7 m/s	9.1 hours
December	-6.6 °C-21.7° to 4.5°	1.1 mm/day	86.5%	3.9 m/s	8.4 hours

Calculated climate highlights

Comparing twelve monthly temperature, precipitation, humidity, wind, and daylight averages across regional coordinates

Helena-Lewis and Clark National Forest Monthly Climate Highlights and Calculated Seasonal Contrasts

Calculated monthly climate normals establish the warmest, coolest, wettest, and windiest calendar intervals derived from long-term regional climatology records. Comparing these modeled averages across multiple variables clarifies annual baseline patterns without referencing specific weather events or generalized park conditions.

Warmest month: July18.4 °C
Coolest month: January-6.9 °C
Wettest month: June3 mm/day
Driest month: December1.1 mm/day
Most humid month: January90.3%
Windiest month: January4 m/s
Longest daylight: June15.7 hours

Interactive climate map

Compare National Park Climate Data Through an Interactive Global Map

Visit the MoriAtlas climate map to compare long-term monthly temperature and precipitation metrics across national parks. This visual interface helps you understand seasonal variations at specific protected area coordinates to deepen your knowledge of global park geography and environmental characteristics.

Global National Park Climate Map

Other park climates

Examine monthly weather patterns and annual atmospheric data across diverse regional landscapes.

Comparing Helena-Lewis and Clark National Forest Climate Profiles With Other Protected Areas

Systematic month-by-month temperature and precipitation records reveal distinct atmospheric variations across various protected landscapes and geographic settings. Standardized meteorological data enables objective comparison of long-term climatic trends between multiple national parks.