Average Weather in May in Siloam Springs Arkansas, United States
Daily high temperatures increase by 7°F, from 73°F to 80°F, rarely falling below 63°F or exceeding 87°F.
Daily low temperatures increase by 9°F, from 53°F to 61°F, rarely falling below 41°F or exceeding 70°F.
For reference, on July 25, the hottest day of the year, temperatures in Siloam Springs typically range from 70°F to 90°F, while on January 6, the coldest day of the year, they range from 28°F to 47°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 Siloam Springs experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 43% throughout the month. The highest chance of overcast or mostly cloudy conditions is 44% on May 15.
The clearest day of the month is May 1, with clear, mostly clear, or partly cloudy conditions 58% of the time.
For reference, on February 12, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 49%, while on July 24, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 71%.
Cloud Cover Categories in May
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Siloam Springs, the chance of a wet day over the course of May is increasing, starting the month at 38% and ending it at 42%.
For reference, the year's highest daily chance of a wet day is 43% on May 21, and its lowest chance is 14% on January 13.
Probability of Precipitation in May
The average sliding 31-day rainfall during May in Siloam Springs is essentially constant, remaining about 4.9 inches throughout, and rarely exceeding 8.1 inches or falling below 2.0 inches.
The highest average 31-day accumulation is 5.0 inches on May 15.
Average Monthly Rainfall in May
Over the course of May in Siloam Springs, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 46 minutes, implying an average daily increase of 1 minute, 33 seconds, and weekly increase of 10 minutes, 48 seconds.
The shortest day of the month is May 1, with 13 hours, 41 minutes of daylight and the longest day is May 31, with 14 hours, 27 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Siloam Springs is 6:25 AM on May 1 and the earliest sunrise is 23 minutes earlier at 6:02 AM on May 31.
The earliest sunset is 8:05 PM on May 1 and the latest sunset is 24 minutes later at 8:29 PM on May 31.
Daylight saving time is observed in Siloam 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 6:01 AM and sets 14 hours, 38 minutes later, at 8:38 PM, while on December 21, the shortest day of the year, it rises at 7:25 AM and sets 9 hours, 42 minutes later, at 5:07 PM.
Sunrise & Sunset with Twilight in May
The chance that a given day will be muggy in Siloam Springs is very rapidly increasing during May, rising from 4% to 26% over the course of the month.
For reference, on July 17, the muggiest day of the year, there are muggy conditions 66% of the time, while on November 20, 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 Siloam Springs is gradually decreasing during May, decreasing from 7.0 miles per hour to 6.0 miles per hour over the course of the month.
For reference, on March 12, the windiest day of the year, the daily average wind speed is 8.0 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 4.7 miles per hour.
Average Wind Speed in May
Wind Direction in May
The growing season in Siloam Springs typically lasts for 6.7 months (205 days), from around April 6 to around October 29, rarely starting before March 17 or after April 25, and rarely ending before October 11 or after November 16.
The month of May in Siloam Springs is very likely fully within the growing season, with the chance that a given day is in the growing season gradually increasing from 96% to 100% 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 Siloam Springs are rapidly increasing during May, increasing by 487°F, from 545°F to 1,032°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in Siloam Springs is essentially constant during May, remaining within 0.2 kWh of 6.3 kWh throughout.
Average Daily Incident Shortwave Solar Energy in May
For the purposes of this report, the geographical coordinates of Siloam Springs are 36.188 deg latitude, -94.540 deg longitude, and 1,135 ft elevation.
The topography within 2 miles of Siloam Springs contains only modest variations in elevation, with a maximum elevation change of 177 feet and an average elevation above sea level of 1,133 feet. Within 10 miles contains only modest variations in elevation (600 feet). Within 50 miles contains significant variations in elevation (2,034 feet).
The area within 2 miles of Siloam Springs is covered by cropland (59%) and artificial surfaces (38%), within 10 miles by cropland (62%) and trees (36%), and within 50 miles by trees (52%) and cropland (43%).
This report illustrates the typical weather in Siloam 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Siloam Springs.
For each station, the records are corrected for the elevation difference between that station and Siloam 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 Siloam Springs is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Siloam Springs and a given station.
The stations contributing to this reconstruction are: Smith Field (95%, 4.5 kilometers, east); Grove Municipal Airport (2.7%, 50 kilometers, north); and Tahlequah Municipal Airport (2.7%, 51 kilometers, southwest).
Time zones for aiports and weather stations are provided by AskGeo.com .