Average Weather in May in Napoleon North Dakota, United States
Daily high temperatures increase by 10°F, from 62°F to 72°F, rarely falling below 47°F or exceeding 82°F.
Daily low temperatures increase by 12°F, from 37°F to 49°F, rarely falling below 26°F or exceeding 58°F.
For reference, on July 24, the hottest day of the year, temperatures in Napoleon typically range from 58°F to 83°F, while on January 15, the coldest day of the year, they range from 4°F to 21°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 Napoleon experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 50% to 46%.
The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 54% of the time.
For reference, on February 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 62%, while on July 24, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 75%.
Cloud Cover Categories in May
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 Napoleon, the chance of a wet day over the course of May is very rapidly increasing, starting the month at 22% and ending it at 34%.
For reference, the year's highest daily chance of a wet day is 36% on June 7, and its lowest chance is 4% on February 2.
Over the course of May in Napoleon, the chance of a day with only rain increases from 21% to 34%, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 0% throughout.
Probability of Precipitation in May
The average sliding 31-day rainfall during May in Napoleon is rapidly increasing, starting the month at 1.7 inches, when it rarely exceeds 3.4 inches or falls below 0.5 inches, and ending the month at 2.7 inches, when it rarely exceeds 4.6 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 Napoleon is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.5 inches or falling below -0.0 inches.
Average Monthly Liquid-Equivalent Snowfall in May
Over the course of May in Napoleon, 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, 18 seconds, and weekly increase of 16 minutes, 6 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, 34 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Napoleon is 6:24 AM on May 1 and the earliest sunrise is 34 minutes earlier at 5:50 AM on May 31.
The earliest sunset is 8:48 PM on May 1 and the latest sunset is 35 minutes later at 9:23 PM on May 31.
Daylight saving time is observed in Napoleon during 2021, 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 5:46 AM and sets 15 hours, 50 minutes later, at 9:35 PM, while on December 21, the shortest day of the year, it rises at 8:20 AM and sets 8 hours, 34 minutes later, at 4:54 PM.
Sunrise & Sunset with Twilight in May
The figure below presents a compact representation of key lunar data for May 2021. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
Moon Rise, Set & Phases in May
The chance that a given day will be muggy in Napoleon is essentially constant during May, remaining within 1% of 1% throughout.
For reference, on July 18, the muggiest day of the year, there are muggy conditions 20% of the time, while on October 27, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in May
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Napoleon is gradually decreasing during May, decreasing from 12.3 miles per hour to 11.5 miles per hour over the course of the month.
For reference, on April 1, the windiest day of the year, the daily average wind speed is 12.8 miles per hour, while on July 27, the calmest day of the year, the daily average wind speed is 9.7 miles per hour.
Average Wind Speed in May
The wind direction in Napoleon during May is predominantly out of the north from May 1 to May 6 and the south from May 6 to May 31.
Wind Direction in May
The growing season in Napoleon typically lasts for 4.4 months (137 days), from around May 13 to around September 27, rarely starting before April 26 or after May 29, and rarely ending before September 10 or after October 14.
During May in Napoleon, the chance that a given day is within the growing season is very rapidly increasing rising from 18% to 94% 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 Napoleon are increasing during May, increasing by 216°F, from 89°F to 306°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in Napoleon 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 Napoleon are 46.508 deg latitude, -99.771 deg longitude, and 1,955 ft elevation.
The topography within 2 miles of Napoleon contains only modest variations in elevation, with a maximum elevation change of 115 feet and an average elevation above sea level of 1,964 feet. Within 10 miles also contains only modest variations in elevation (328 feet). Within 50 miles contains only modest variations in elevation (846 feet).
The area within 2 miles of Napoleon is covered by cropland (61%), water (25%), and grassland (14%), within 10 miles by cropland (48%) and grassland (48%), and within 50 miles by grassland (58%) and cropland (38%).
This report illustrates the typical weather in Napoleon, 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Napoleon.
For each station, the records are corrected for the elevation difference between that station and Napoleon 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 Napoleon is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Napoleon and a given station.
The stations contributing to this reconstruction are: Ashley Municipal Airport (44%, 49 kilometers, southwest); Bismarck Municipal Airport (20%, 81 kilometers, west); Jamestown Municipal Airport (16%, 96 kilometers, northeast); Carrington Municipal Airport (12%, 115 kilometers, northeast); and Aberdeen Regional Airport (7%, 158 kilometers, southeast).
Time zones for airports and weather stations are provided by AskGeo.com .