Average Weather in March in Helena Valley Northwest Montana, United States
Daily high temperatures increase by 9°F, from 42°F to 51°F, rarely falling below 26°F or exceeding 65°F.
Daily low temperatures increase by 7°F, from 22°F to 29°F, rarely falling below 5°F or exceeding 39°F.
For reference, on July 27, the hottest day of the year, temperatures in Helena Valley Northwest typically range from 55°F to 85°F, while on January 1, the coldest day of the year, they range from 13°F to 30°F.
Average High and Low Temperature in March
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on March. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in March
Refahiye, Turkey (6,194 miles away); Brrnakot’, Armenia (6,334 miles); and Tagob, Tajikistan (6,532 miles) are the far-away foreign places with temperatures most similar to Helena Valley Northwest (view comparison).
The month of March in Helena Valley Northwest experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 63% throughout the month. The highest chance of overcast or mostly cloudy conditions is 64% on March 19.
The clearest day of the month is March 5, with clear, mostly clear, or partly cloudy conditions 38% of the time.
For reference, on March 18, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 64%, while on July 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 77%.
Cloud Cover Categories in March
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Helena Valley Northwest, the chance of a wet day over the course of March is increasing, starting the month at 10% and ending it at 16%.
For reference, the year's highest daily chance of a wet day is 36% on June 3, and its lowest chance is 8% on January 22.
Over the course of March in Helena Valley Northwest, the chance of a day with only rain increases from 5% to 10%, the chance of a day with mixed snow and rain remains an essentially constant 3% throughout, and the chance of a day with only snow remains an essentially constant 3% throughout.
Probability of Precipitation in March
The average sliding 31-day rainfall during March in Helena Valley Northwest is gradually increasing, starting the month at 0.2 inches, when it rarely exceeds 0.4 inches, and ending the month at 0.6 inches, when it rarely exceeds 1.1 inches or falls below 0.2 inches.
Average Monthly Rainfall in March
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during March in Helena Valley Northwest is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.5 inches or falling to 0.0 inches.
The highest average 31-day liquid-equivalent accumulation is 0.2 inches on March 2.
Average Monthly Liquid-Equivalent Snowfall in March
Over the course of March in Helena Valley Northwest, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 40 minutes, implying an average daily increase of 3 minutes, 21 seconds, and weekly increase of 23 minutes, 25 seconds.
The shortest day of the month is March 1, with 11 hours, 7 minutes of daylight and the longest day is March 31, with 12 hours, 47 minutes of daylight.
Hours of Daylight and Twilight in March
The earliest sunrise of the month in Helena Valley Northwest is 6:50 AM on March 10 and the latest sunrise is 58 minutes later at 7:48 AM on March 11.
The earliest sunset is 6:14 PM on March 1 and the latest sunset is 1 hour, 42 minutes later at 7:56 PM on March 31.
Daylight saving time (DST) starts at 3:00 AM on March 11, 2018, shifting sunrise and sunset to be an hour later.
For reference, on June 21, the longest day of the year, the Sun rises at 5:34 AM and sets 15 hours, 52 minutes later, at 9:25 PM, while on December 21, the shortest day of the year, it rises at 8:10 AM and sets 8 hours, 33 minutes later, at 4:42 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in March
The chance that a given day will be muggy in Helena Valley Northwest is essentially constant during March, remaining around 0% throughout.
For reference, on June 12, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in March
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Helena Valley Northwest is essentially constant during March, remaining within 0.1 miles per hour of 7.3 miles per hour throughout.
For reference, on January 17, the windiest day of the year, the daily average wind speed is 7.9 miles per hour, while on August 5, the calmest day of the year, the daily average wind speed is 5.0 miles per hour.
Average Wind Speed in March
Wind Direction in March
The growing season in Helena Valley Northwest typically lasts for 4.5 months (137 days), from around May 12 to around September 27, rarely starting before April 24 or after June 2, and rarely ending before September 8 or after October 14.
The month of March in Helena Valley Northwest is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in March
The average accumulated growing degree days in Helena Valley Northwest are essentially constant during March, remaining within 8°F of 12°F throughout.
Growing Degree Days in March
The average daily incident shortwave solar energy in Helena Valley Northwest is increasing during March, rising by 1.3 kWh, from 3.2 kWh to 4.6 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in March
For the purposes of this report, the geographical coordinates of Helena Valley Northwest are 46.729 deg latitude, -112.063 deg longitude, and 4,072 ft elevation.
The topography within 2 miles of Helena Valley Northwest contains significant variations in elevation, with a maximum elevation change of 715 feet and an average elevation above sea level of 4,016 feet. Within 10 miles contains significant variations in elevation (3,041 feet). Within 50 miles contains large variations in elevation (6,368 feet).
The area within 2 miles of Helena Valley Northwest is covered by grassland (81%) and shrubs (18%), within 10 miles by shrubs (42%) and grassland (39%), and within 50 miles by grassland (29%) and trees (27%).
This report illustrates the typical weather in Helena Valley Northwest year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Helena Valley Northwest.
For each station, the records are corrected for the elevation difference between that station and Helena Valley Northwest according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Helena Valley Northwest is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Helena Valley Northwest and a given station.
The stations contributing to this reconstruction are: Helena Regional Airport (90%, 16 kilometers, southeast); Great Falls International Airport (7%, 98 kilometers, northeast); and Missoula International Airport (3.3%, 156 kilometers, west).
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Time zones for aiports and weather stations are provided by AskGeo.com .