Average Weather in April in Sultan Washington, United States
Daily low temperatures increase by 4°F, from 41°F to 45°F, rarely falling below 35°F or exceeding 52°F.
For reference, on August 3, the hottest day of the year, temperatures in Sultan typically range from 58°F to 78°F, while on December 23, the coldest day of the year, they range from 35°F to 43°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 Sultan experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 72% to 63%.
The clearest day of the month is April 30, with clear, mostly clear, or partly cloudy conditions 37% of the time.
For reference, on November 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 79%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 70%.
Cloud Cover Categories in April
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Sultan, the chance of a wet day over the course of April is very rapidly decreasing, starting the month at 50% and ending it at 39%.
For reference, the year's highest daily chance of a wet day is 62% on November 18, and its lowest chance is 10% on August 6.
Probability of Precipitation in April
The average sliding 31-day rainfall during April in Sultan is rapidly decreasing, starting the month at 5.5 inches, when it rarely exceeds 8.6 inches or falls below 2.7 inches, and ending the month at 3.6 inches, when it rarely exceeds 6.0 inches or falls below 1.4 inches.
Average Monthly Rainfall in April
Over the course of April in Sultan, 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, 36 minutes, implying an average daily increase of 3 minutes, 18 seconds, and weekly increase of 23 minutes, 6 seconds.
The shortest day of the month is April 1, with 12 hours, 53 minutes of daylight and the longest day is April 30, with 14 hours, 29 minutes of daylight.
Hours of Daylight and Twilight in April
The latest sunrise of the month in Sultan is 6:44 AM on April 1 and the earliest sunrise is 54 minutes earlier at 5:50 AM on April 30.
The earliest sunset is 7:37 PM on April 1 and the latest sunset is 41 minutes later at 8:19 PM on April 30.
Daylight saving time is observed in Sultan during 2017, 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 5:08 AM and sets 16 hours, 2 minutes later, at 9:09 PM, while on December 21, the shortest day of the year, it rises at 7:53 AM and sets 8 hours, 23 minutes later, at 4:17 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in April
The chance that a given day will be muggy in Sultan is essentially constant during April, remaining around 0% throughout.
For reference, on July 29, the muggiest day of the year, there are muggy conditions 0% 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 April
The average hourly wind speed in Sultan is essentially constant during April, remaining within 0.2 miles per hour of 3.7 miles per hour throughout.
For reference, on December 29, the windiest day of the year, the daily average wind speed is 5.1 miles per hour, while on August 9, the calmest day of the year, the daily average wind speed is 2.6 miles per hour.
Average Wind Speed in April
Wind Direction in April
Sultan is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average surface water temperature in Sultan is gradually increasing during April, rising by 2°F, from 48°F to 50°F, over the course of the month.
Average Water Temperature in April
The growing season in Sultan typically lasts for 7.8 months (237 days), from around March 20 to around November 12, rarely starting before February 21 or after April 14, and rarely ending before October 26 or after December 8.
The month of April in Sultan 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 72% to 99% 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 Sultan are gradually increasing during April, increasing by 79°F, from 46°F to 125°F, over the course of the month.
Growing Degree Days in April
The average daily incident shortwave solar energy in Sultan is increasing during April, rising by 1.4 kWh, from 3.6 kWh to 5.0 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 Sultan are 47.863 deg latitude, -121.817 deg longitude, and 338 ft elevation.
The topography within 2 miles of Sultan contains only modest variations in elevation, with a maximum elevation change of 472 feet and an average elevation above sea level of 229 feet. Within 10 miles contains only modest variations in elevation (5,108 feet). Within 50 miles also contains extreme variations in elevation (10,531 feet).
The area within 2 miles of Sultan is covered by trees (47%), cropland (33%), and artificial surfaces (19%), within 10 miles by trees (78%), and within 50 miles by trees (54%) and shrubs (14%).
This report illustrates the typical weather in Sultan 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 Sultan.
For each station, the records are corrected for the elevation difference between that station and Sultan 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 Sultan is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Sultan and a given station.
The stations contributing to this reconstruction are: Snohomish County Airport (Paine Field) (39%, 35 kilometers, west); Arlington Municipal Airport (30%, 42 kilometers, northwest); Renton Municipal Airport (22%, 51 kilometers, southwest); Stampede Pass (5%, 74 kilometers, southeast); and Omak Airport (3.3%, 183 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .