Average Weather in May in Bismarck North Dakota, United States
Daily high temperatures increase by 10°F, from 64°F to 73°F, rarely falling below 49°F or exceeding 84°F.
Daily low temperatures increase by 11°F, from 39°F to 50°F, rarely falling below 28°F or exceeding 59°F.
For reference, on July 24, the hottest day of the year, temperatures in Bismarck typically range from 60°F to 85°F, while on January 12, the coldest day of the year, they range from 5°F to 23°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
Bayzhansay, Kazakhstan (6,201 miles away); Jiayuguan, China (6,345 miles); and Shitanjing, China (6,268 miles) are the far-away foreign places with temperatures most similar to Bismarck (view comparison).
The month of May in Bismarck experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 47% throughout the month.
The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 55% of the time.
For reference, on January 10, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 60%, while on July 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 76%.
Cloud Cover Categories in May
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Bismarck, the chance of a wet day over the course of May is very rapidly increasing, starting the month at 22% and ending it at 31%.
For reference, the year's highest daily chance of a wet day is 34% on June 13, and its lowest chance is 4% on February 2.
Probability of Precipitation in May
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during May in Bismarck is increasing, starting the month at 1.6 inches, when it rarely exceeds 3.3 inches or falls below 0.5 inches, and ending the month at 2.6 inches, when it rarely exceeds 4.4 inches or falls below 0.9 inches.
Average Monthly Rainfall in May
Over the course of May in Bismarck, 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, 10 minutes, implying an average daily increase of 2 minutes, 21 seconds, and weekly increase of 16 minutes, 24 seconds.
The shortest day of the month is May 1, with 14 hours, 25 minutes of daylight and the longest day is May 31, with 15 hours, 36 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Bismarck is 6:27 AM on May 1 and the earliest sunrise is 35 minutes earlier at 5:53 AM on May 31.
The earliest sunset is 8:53 PM on May 1 and the latest sunset is 36 minutes later at 9:28 PM on May 31.
Daylight saving time is observed in Bismarck 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 5:48 AM and sets 15 hours, 52 minutes later, at 9:41 PM, while on December 21, the shortest day of the year, it rises at 8:25 AM and sets 8 hours, 32 minutes later, at 4:57 PM.
Sunrise & Sunset with Twilight in May
The chance that a given day will be muggy in Bismarck is essentially constant during May, remaining around 0% throughout.
For reference, on July 18, the muggiest day of the year, there are muggy conditions 14% 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 May
The average hourly wind speed in Bismarck is gradually decreasing during May, decreasing from 11.9 miles per hour to 11.2 miles per hour over the course of the month.
For reference, on March 31, the windiest day of the year, the daily average wind speed is 12.3 miles per hour, while on July 26, the calmest day of the year, the daily average wind speed is 9.5 miles per hour.
Average Wind Speed in May
Wind Direction in May
The growing season in Bismarck typically lasts for 4.5 months (139 days), from around May 12 to around September 28, rarely starting before April 23 or after May 29, and rarely ending before September 10 or after October 16.
During May in Bismarck, the chance that a given day is within the growing season is very rapidly increasing rising from 22% to 93% 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 Bismarck are increasing during May, increasing by 247°F, from 114°F to 361°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in Bismarck is gradually increasing during May, rising by 0.7 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 Bismarck are 46.808 deg latitude, -100.784 deg longitude, and 1,670 ft elevation.
The topography within 2 miles of Bismarck contains only modest variations in elevation, with a maximum elevation change of 276 feet and an average elevation above sea level of 1,709 feet. Within 10 miles contains only modest variations in elevation (499 feet). Within 50 miles contains significant variations in elevation (938 feet).
The area within 2 miles of Bismarck is covered by artificial surfaces (80%) and grassland (11%), within 10 miles by grassland (78%) and cropland (12%), and within 50 miles by grassland (73%) and cropland (24%).
This report illustrates the typical weather in Bismarck 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 Bismarck.
For each station, the records are corrected for the elevation difference between that station and Bismarck 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 Bismarck is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Bismarck and a given station.
The stations contributing to this reconstruction are: Bismarck Municipal Airport (98%, 3.5 kilometers, southeast); Mercer County Regional Airport (0.9%, 81 kilometers, northwest); and Glen Ullin Regional (0.9%, 82 kilometers, west).
Time zones for aiports and weather stations are provided by AskGeo.com .