Average Weather in May in Salem Ohio, United States
Daily high temperatures increase by 8°F, from 66°F to 74°F, rarely falling below 52°F or exceeding 84°F.
Daily low temperatures increase by 9°F, from 45°F to 54°F, rarely falling below 34°F or exceeding 65°F.
For reference, on July 20, the hottest day of the year, temperatures in Salem typically range from 63°F to 82°F, while on January 29, the coldest day of the year, they range from 20°F to 33°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 Salem experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 52% throughout the month.
The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 49% of the time.
For reference, on January 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 70%, while on August 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 66%.
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 Salem, the chance of a wet day over the course of May is increasing, starting the month at 33% and ending it at 38%.
For reference, the year's highest daily chance of a wet day is 39% on June 8, and its lowest chance is 19% on January 29.
Probability of Precipitation in May
The average sliding 31-day rainfall during May in Salem is increasing, starting the month at 2.8 inches, when it rarely exceeds 4.8 inches or falls below 1.3 inches, and ending the month at 3.3 inches, when it rarely exceeds 5.3 inches or falls below 1.4 inches.
Average Monthly Rainfall in May
Over the course of May in Salem, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 55 minutes, implying an average daily increase of 1 minute, 51 seconds, and weekly increase of 12 minutes, 54 seconds.
The shortest day of the month is May 1, with 13 hours, 59 minutes of daylight and the longest day is May 31, with 14 hours, 54 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Salem is 6:21 AM on May 1 and the earliest sunrise is 27 minutes earlier at 5:54 AM on May 31.
The earliest sunset is 8:20 PM on May 1 and the latest sunset is 28 minutes later at 8:48 PM on May 31.
Daylight saving time is observed in Salem 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 5:51 AM and sets 15 hours, 7 minutes later, at 8:58 PM, while on December 21, the shortest day of the year, it rises at 7:44 AM and sets 9 hours, 14 minutes later, at 4:58 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 Salem is increasing during May, rising from 0% to 10% over the course of the month.
For reference, on July 29, the muggiest day of the year, there are muggy conditions 38% 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
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Salem is gradually decreasing during May, decreasing from 5.3 miles per hour to 4.5 miles per hour over the course of the month.
For reference, on January 31, the windiest day of the year, the daily average wind speed is 7.2 miles per hour, while on August 5, the calmest day of the year, the daily average wind speed is 3.7 miles per hour.
Average Wind Speed in May
The hourly average wind direction in Salem throughout May is predominantly from the west, with a peak proportion of 33% on May 1.
Wind Direction in May
The growing season in Salem typically lasts for 5.8 months (176 days), from around April 26 to around October 19, rarely starting before April 9 or after May 15, and rarely ending before October 3 or after November 6.
The month of May in Salem is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly increasing from 62% to 99% 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 Salem are increasing during May, increasing by 315°F, from 214°F to 529°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in Salem is gradually increasing during May, rising by 0.7 kWh, from 5.7 kWh to 6.4 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 Salem are 40.901 deg latitude, -80.857 deg longitude, and 1,224 ft elevation.
The topography within 2 miles of Salem contains only modest variations in elevation, with a maximum elevation change of 266 feet and an average elevation above sea level of 1,235 feet. Within 10 miles also contains only modest variations in elevation (456 feet). Within 50 miles contains only modest variations in elevation (994 feet).
The area within 2 miles of Salem is covered by artificial surfaces (67%), cropland (20%), and trees (14%), within 10 miles by cropland (74%) and trees (17%), and within 50 miles by trees (47%) and cropland (36%).
This report illustrates the typical weather in Salem, 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 Salem.
For each station, the records are corrected for the elevation difference between that station and Salem 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 Salem is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Salem and a given station.
The stations contributing to this reconstruction are: New Castle Municipal Airport (22%, 40 kilometers, east); Youngstown–Warren Regional Airport (20%, 42 kilometers, north); Portage County Airport (16%, 48 kilometers, northwest); Akron-Canton Regional Airport (16%, 49 kilometers, west); Harry Clever Field Airport (10%, 68 kilometers, southwest); Pittsburgh International Airport (9%, 71 kilometers, southeast); and Wheeling Ohio County Airport (7%, 83 kilometers, south).
Time zones for airports and weather stations are provided by AskGeo.com .