Average Weather in May in White Sulphur Springs Montana, United States
Daily high temperatures increase by 8°F, from 56°F to 64°F, rarely falling below 42°F or exceeding 76°F.
Daily low temperatures increase by 8°F, from 34°F to 42°F, rarely falling below 25°F or exceeding 49°F.
For reference, on July 31, the hottest day of the year, temperatures in White Sulphur Springs typically range from 51°F to 81°F, while on January 1, the coldest day of the year, they range from 12°F to 28°F.
Average High and Low Temperature in May
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on May. 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 May
The month of May in White Sulphur Springs experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 53% throughout the month.
The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 48% of the time.
For reference, on March 18, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 63%, while on July 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 77%.
Cloud Cover Categories in May
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In White Sulphur Springs, the chance of a wet day over the course of May is very rapidly increasing, starting the month at 26% and ending it at 38%.
For reference, the year's highest daily chance of a wet day is 39% on June 2, and its lowest chance is 8% on January 27.
Over the course of May in White Sulphur Springs, the chance of a day with only rain increases from 21% to 37%, the chance of a day with mixed snow and rain decreases from 4% to 1%, and the chance of a day with only snow remains an essentially constant 1% throughout.
Probability of Precipitation in May
The average sliding 31-day rainfall during May in White Sulphur Springs is rapidly increasing, starting the month at 1.4 inches, when it rarely exceeds 2.5 inches or falls below 0.5 inches, and ending the month at 2.6 inches, when it rarely exceeds 4.7 inches or falls below 1.2 inches.
Average Monthly Rainfall in May
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 May in White Sulphur Springs is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.6 inches or falling below -0.0 inches.
Average Monthly Liquid-Equivalent Snowfall in May
Over the course of May in White Sulphur Springs, 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, 9 minutes, implying an average daily increase of 2 minutes, 19 seconds, and weekly increase of 16 minutes, 12 seconds.
The shortest day of the month is May 1, with 14 hours, 24 minutes of daylight and the longest day is May 31, with 15 hours, 34 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in White Sulphur Springs is 6:09 AM on May 1 and the earliest sunrise is 34 minutes earlier at 5:34 AM on May 31.
The earliest sunset is 8:33 PM on May 1 and the latest sunset is 35 minutes later at 9:08 PM on May 31.
Daylight saving time is observed in White Sulphur Springs during 2018, but it neither starts nor ends during May, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:30 AM and sets 15 hours, 50 minutes later, at 9:20 PM, while on December 21, the shortest day of the year, it rises at 8:04 AM and sets 8 hours, 34 minutes later, at 4:38 PM.
Sunrise & Sunset with Twilight in May
The chance that a given day will be muggy in White Sulphur Springs is essentially constant during May, remaining around 0% throughout.
Humidity Comfort Levels in May
The average hourly wind speed in White Sulphur Springs is gradually decreasing during May, decreasing from 6.7 miles per hour to 6.2 miles per hour over the course of the month.
For reference, on January 17, the windiest day of the year, the daily average wind speed is 8.3 miles per hour, while on August 5, the calmest day of the year, the daily average wind speed is 5.1 miles per hour.
Average Wind Speed in May
Wind Direction in May
The growing season in White Sulphur Springs typically lasts for 3.8 months (117 days), from around May 25 to around September 19, rarely starting before May 7 or after June 15, and rarely ending before September 1 or after October 7.
During May in White Sulphur Springs, the chance that a given day is within the growing season is very rapidly increasing rising from 3% to 64% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in May
The average accumulated growing degree days in White Sulphur Springs are gradually increasing during May, increasing by 106°F, from 53°F to 159°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in White Sulphur Springs is gradually increasing during May, rising by 0.8 kWh, from 6.0 kWh to 6.8 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in May
For the purposes of this report, the geographical coordinates of White Sulphur Springs are 46.548 deg latitude, -110.902 deg longitude, and 5,112 ft elevation.
The topography within 2 miles of White Sulphur Springs contains only modest variations in elevation, with a maximum elevation change of 446 feet and an average elevation above sea level of 5,085 feet. Within 10 miles contains only modest variations in elevation (3,835 feet). Within 50 miles also contains extreme variations in elevation (7,595 feet).
The area within 2 miles of White Sulphur Springs is covered by cropland (50%) and grassland (49%), within 10 miles by grassland (52%) and trees (17%), and within 50 miles by grassland (42%) and trees (29%).
This report illustrates the typical weather in White Sulphur Springs 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 7 weather stations near enough to contribute to our estimation of the temperature and dew point in White Sulphur Springs.
For each station, the records are corrected for the elevation difference between that station and White Sulphur Springs 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 White Sulphur Springs is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between White Sulphur Springs and a given station.
The stations contributing to this reconstruction are: Helena Regional Airport (17%, 82 kilometers, west); Gallatin Field Airport (18%, 87 kilometers, south); Bravo (16%, 91 kilometers, northeast); Mission Field (14%, 101 kilometers, south); Great Falls International Airport (12%, 109 kilometers, north); Mike (12%, 110 kilometers, northeast); and Malmstrom Air Force Base (11%, 110 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .