Average Weather in May in Rockville Minnesota, United States
Daily high temperatures increase by 10°F, from 63°F to 73°F, rarely falling below 49°F or exceeding 84°F.
Daily low temperatures increase by 11°F, from 41°F to 52°F, rarely falling below 31°F or exceeding 62°F.
For reference, on July 18, the hottest day of the year, temperatures in Rockville typically range from 61°F to 82°F, while on January 20, the coldest day of the year, they range from 5°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 Rockville experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 51% to 45%.
The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 55% of the time.
For reference, on February 6, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 61%, while on July 28, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 72%.
Cloud Cover Categories in May
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Rockville, the chance of a wet day over the course of May is rapidly increasing, starting the month at 28% and ending it at 35%.
For reference, the year's highest daily chance of a wet day is 40% on June 13, and its lowest chance is 7% on January 28.
Over the course of May in Rockville, the chance of a day with only rain increases from 26% to 35%, 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 Rockville is increasing, starting the month at 2.6 inches, when it rarely exceeds 4.7 inches or falls below 0.8 inches, and ending the month at 3.5 inches, when it rarely exceeds 6.4 inches or falls below 1.4 inches.
Average Monthly Rainfall in May
Over the course of May in Rockville, 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, 7 minutes, implying an average daily increase of 2 minutes, 13 seconds, and weekly increase of 15 minutes, 31 seconds.
The shortest day of the month is May 1, with 14 hours, 19 minutes of daylight and the longest day is May 31, with 15 hours, 25 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Rockville is 6:05 AM on May 1 and the earliest sunrise is 33 minutes earlier at 5:32 AM on May 31.
The earliest sunset is 8:24 PM on May 1 and the latest sunset is 34 minutes later at 8:57 PM on May 31.
Daylight saving time is observed in Rockville 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 5:28 AM and sets 15 hours, 41 minutes later, at 9:09 PM, while on December 21, the shortest day of the year, it rises at 7:54 AM and sets 8 hours, 42 minutes later, at 4:36 PM.
Sunrise & Sunset with Twilight in May
The chance that a given day will be muggy in Rockville is gradually increasing during May, rising from 0% to 3% over the course of the month.
For reference, on July 20, the muggiest day of the year, there are muggy conditions 29% of the time, while on November 15, 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 Rockville is decreasing during May, decreasing from 12.0 miles per hour to 10.5 miles per hour over the course of the month.
For reference, on April 2, the windiest day of the year, the daily average wind speed is 12.6 miles per hour, while on August 1, the calmest day of the year, the daily average wind speed is 8.7 miles per hour.
Average Wind Speed in May
Wind Direction in May
The growing season in Rockville typically lasts for 5.0 months (151 days), from around May 3 to around October 2, rarely starting before April 15 or after May 23, and rarely ending before September 14 or after October 19.
During May in Rockville, the chance that a given day is within the growing season is very rapidly increasing rising from 44% to 97% 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 Rockville are increasing during May, increasing by 257°F, from 105°F to 362°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in Rockville is gradually increasing during May, rising by 0.8 kWh, from 5.8 kWh to 6.6 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 Rockville are 45.472 deg latitude, -94.341 deg longitude, and 1,122 ft elevation.
The topography within 2 miles of Rockville contains only modest variations in elevation, with a maximum elevation change of 184 feet and an average elevation above sea level of 1,116 feet. Within 10 miles contains only modest variations in elevation (499 feet). Within 50 miles also contains significant variations in elevation (659 feet).
The area within 2 miles of Rockville is covered by cropland (67%) and trees (33%), within 10 miles by cropland (69%) and trees (20%), and within 50 miles by cropland (77%) and trees (15%).
This report illustrates the typical weather in Rockville 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Rockville.
For each station, the records are corrected for the elevation difference between that station and Rockville 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 Rockville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Rockville and a given station.
The stations contributing to this reconstruction are: St. Cloud Regional Airport (34%, 24 kilometers, east); Paynesville Municipal Airport (21%, 34 kilometers, west); Maple Lake Municipal Airport (17%, 38 kilometers, southeast); Litchfield Municipal Airport (17%, 38 kilometers, south); and Little Falls, Little Falls/Morrison County Airport-Lindbergh Field (11%, 53 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .