Average Weather in May in Janesville California, United States
In Janesville, the month of May is characterized by rising daily high temperatures, with daily highs increasing by 8°F, from 64°F to 72°F over the course of the month, and rarely exceeding 84°F or dropping below 51°F.
Daily low temperatures increase by 7°F, from 40°F to 46°F, rarely falling below 32°F or exceeding 54°F.
For reference, on July 29, the hottest day of the year, temperatures in Janesville typically range from 56°F to 86°F, while on December 31, the coldest day of the year, they range from 25°F to 40°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 Janesville experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 45% to 35%.
The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 65% of the time.
For reference, on January 10, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 57%, while on July 28, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 89%.
Cloud Cover Categories in May
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Janesville, the chance of a wet day over the course of May is gradually decreasing, starting the month at 16% and ending it at 13%.
For reference, the year's highest daily chance of a wet day is 32% on February 28, and its lowest chance is 2% on July 20.
Probability of Precipitation in May
The average sliding 31-day rainfall during May in Janesville is gradually decreasing, starting the month at 1.1 inches, when it rarely exceeds 2.3 inches or falls below 0.2 inches, and ending the month at 0.8 inches, when it rarely exceeds 2.0 inches.
Average Monthly Rainfall in May
Over the course of May in Janesville, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 54 minutes, implying an average daily increase of 1 minute, 48 seconds, and weekly increase of 12 minutes, 34 seconds.
The shortest day of the month is May 1, with 13 hours, 57 minutes of daylight and the longest day is May 31, with 14 hours, 51 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Janesville is 6:01 AM on May 1 and the earliest sunrise is 26 minutes earlier at 5:34 AM on May 31.
The earliest sunset is 7:57 PM on May 1 and the latest sunset is 28 minutes later at 8:25 PM on May 31.
Daylight saving time is observed in Janesville during 2017, 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 5:32 AM and sets 15 hours, 3 minutes later, at 8:35 PM, while on December 21, the shortest day of the year, it rises at 7:21 AM and sets 9 hours, 18 minutes later, at 4:39 PM.
Sunrise & Sunset with Twilight in May
The chance that a given day will be muggy in Janesville is essentially constant during May, remaining around 0% throughout.
Humidity Comfort Levels in May
The average hourly wind speed in Janesville is essentially constant during May, remaining within 0.2 miles per hour of 5.9 miles per hour throughout.
For reference, on April 5, the windiest day of the year, the daily average wind speed is 6.4 miles per hour, while on August 6, the calmest day of the year, the daily average wind speed is 5.0 miles per hour.
Average Wind Speed in May
Wind Direction in May
The growing season in Janesville typically lasts for 5.5 months (170 days), from around May 2 to around October 20, rarely starting before April 13 or after May 24, and rarely ending before September 28 or after November 8.
During May in Janesville, the chance that a given day is within the growing season is rapidly increasing rising from 47% to 95% 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 Janesville is increasing during May, increasing by 226°F, from 149°F to 375°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in Janesville is gradually increasing during May, rising by 1.0 kWh, from 6.9 kWh to 7.9 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 Janesville are 40.297 deg latitude, -120.524 deg longitude, and 4,344 ft elevation.
The topography within 2 miles of Janesville contains very significant variations in elevation, with a maximum elevation change of 1,542 feet and an average elevation above sea level of 4,389 feet. Within 10 miles contains very significant variations in elevation (3,770 feet). Within 50 miles also contains extreme variations in elevation (6,949 feet).
The area within 2 miles of Janesville is covered by shrubs (61%), grassland (24%), and trees (12%), within 10 miles by shrubs (39%) and trees (34%), and within 50 miles by shrubs (52%) and trees (40%).
This report illustrates the typical weather in Janesville 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 6 weather stations near enough to contribute to our estimation of the temperature and dew point in Janesville.
For each station, the records are corrected for the elevation difference between that station and Janesville 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 Janesville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Janesville and a given station.
The stations contributing to this reconstruction are: Reno Stead Airport (30%, 89 kilometers, southeast); Blue Canyon-Nyack Airport (21%, 115 kilometers, south); Chico Municipal Airport (11%, 126 kilometers, southwest); Oroville Municipal Airport (11%, 130 kilometers, southwest); Alturas Municipal Airport (17%, 133 kilometers, north); and Redding Municipal Airport (10%, 152 kilometers, west).
Time zones for aiports and weather stations are provided by AskGeo.com .