Average Weather in April in Johnstonville California, United States
Daily high temperatures increase by 7°F, from 57°F to 64°F, rarely falling below 44°F or exceeding 77°F.
Daily low temperatures increase by 5°F, from 34°F to 40°F, rarely falling below 27°F or exceeding 48°F.
For reference, on August 3, the hottest day of the year, temperatures in Johnstonville typically range from 56°F to 87°F, while on January 1, the coldest day of the year, they range from 25°F to 41°F.
Average High and Low Temperature in April
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. 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 April
The month of April in Johnstonville experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 50% to 45%.
The clearest day of the month is April 28, with clear, mostly clear, or partly cloudy conditions 55% 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 April
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Johnstonville, the chance of a wet day over the course of April is gradually decreasing, starting the month at 20% and ending it at 16%.
For reference, the year's highest daily chance of a wet day is 32% on February 28, and its lowest chance is 2% on August 23.
Over the course of April in Johnstonville, the chance of a day with only rain remains an essentially constant 17% throughout, the chance of a day with mixed snow and rain decreases from 2% to 0%, and the chance of a day with only snow remains an essentially constant 0% throughout.
Probability of Precipitation in April
The average sliding 31-day rainfall during April in Johnstonville is decreasing, starting the month at 1.8 inches, when it rarely exceeds 4.0 inches or falls below 0.3 inches, and ending the month at 1.1 inches, when it rarely exceeds 2.2 inches or falls below 0.2 inches.
Average Monthly Rainfall in April
Over the course of April in Johnstonville, 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, 13 minutes, implying an average daily increase of 2 minutes, 31 seconds, and weekly increase of 17 minutes, 38 seconds.
The shortest day of the month is April 1, with 12 hours, 41 minutes of daylight and the longest day is April 30, with 13 hours, 54 minutes of daylight.
Hours of Daylight and Twilight in April
The latest sunrise of the month in Johnstonville is 6:45 AM on April 1 and the earliest sunrise is 43 minutes earlier at 6:02 AM on April 30.
The earliest sunset is 7:27 PM on April 1 and the latest sunset is 30 minutes later at 7:56 PM on April 30.
Daylight saving time is observed in Johnstonville during 2018, but it neither starts nor ends during April, 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, 4 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, 17 minutes later, at 4:39 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in April
The chance that a given day will be muggy in Johnstonville is essentially constant during April, remaining around 0% throughout.
Humidity Comfort Levels in April
The average hourly wind speed in Johnstonville is essentially constant during April, remaining within 0.1 miles per hour of 6.4 miles per hour throughout.
For reference, on April 5, the windiest day of the year, the daily average wind speed is 6.5 miles per hour, while on August 6, the calmest day of the year, the daily average wind speed is 5.1 miles per hour.
The highest daily average wind speed during April is 6.5 miles per hour on April 5.
Average Wind Speed in April
Wind Direction in April
The growing season in Johnstonville typically lasts for 5.5 months (170 days), from around May 3 to around October 20, rarely starting before April 14 or after May 25, and rarely ending before September 30 or after November 8.
The month of April in Johnstonville is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season rapidly increasing from 0% to 42% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in April
The average accumulated growing degree days in Johnstonville are gradually increasing during April, increasing by 100°F, from 54°F to 154°F, over the course of the month.
Growing Degree Days in April
The average daily incident shortwave solar energy in Johnstonville is increasing during April, rising by 1.2 kWh, from 5.6 kWh to 6.9 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in April
For the purposes of this report, the geographical coordinates of Johnstonville are 40.384 deg latitude, -120.587 deg longitude, and 4,160 ft elevation.
The topography within 2 miles of Johnstonville contains significant variations in elevation, with a maximum elevation change of 509 feet and an average elevation above sea level of 4,160 feet. Within 10 miles contains significant variations in elevation (3,753 feet). Within 50 miles also contains extreme variations in elevation (8,560 feet).
The area within 2 miles of Johnstonville is covered by shrubs (43%), cropland (42%), and grassland (15%), within 10 miles by shrubs (54%) and trees (31%), and within 50 miles by shrubs (52%) and trees (40%).
This report illustrates the typical weather in Johnstonville 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 Johnstonville.
For each station, the records are corrected for the elevation difference between that station and Johnstonville 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 Johnstonville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Johnstonville and a given station.
The stations contributing to this reconstruction are: Reno Stead Airport (29%, 100 kilometers, southeast); Alturas Municipal Airport (23%, 123 kilometers, north); Blue Canyon-Nyack Airport (21%, 124 kilometers, south); Chico Municipal Airport (14%, 126 kilometers, southwest); and Redding Municipal Airport (13%, 146 kilometers, west).
Time zones for aiports and weather stations are provided by AskGeo.com .