Average Weather in March in Marietta-Alderwood Washington, United States
Daily high temperatures increase by 4°F, from 50°F to 55°F, rarely falling below 43°F or exceeding 62°F.
Daily low temperatures increase by 3°F, from 38°F to 41°F, rarely falling below 29°F or exceeding 47°F.
For reference, on August 3, the hottest day of the year, temperatures in Marietta-Alderwood typically range from 56°F to 74°F, while on January 1, the coldest day of the year, they range from 35°F to 44°F.
Average High and Low Temperature in March
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on March. 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 March
The month of March in Marietta-Alderwood experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 66% throughout the month.
The clearest day of the month is March 31, with clear, mostly clear, or partly cloudy conditions 35% of the time.
For reference, on January 14, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 72%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 73%.
Cloud Cover Categories in March
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 Marietta-Alderwood, the chance of a wet day over the course of March is gradually decreasing, starting the month at 45% and ending it at 42%.
For reference, the year's highest daily chance of a wet day is 58% on November 18, and its lowest chance is 9% on August 1.
Probability of Precipitation in March
The average sliding 31-day rainfall during March in Marietta-Alderwood is decreasing, starting the month at 4.2 inches, when it rarely exceeds 7.1 inches or falls below 1.7 inches, and ending the month at 3.4 inches, when it rarely exceeds 5.4 inches or falls below 1.7 inches.
Average Monthly Rainfall in March
Over the course of March in Marietta-Alderwood, 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, 48 minutes, implying an average daily increase of 3 minutes, 36 seconds, and weekly increase of 25 minutes, 10 seconds.
The shortest day of the month is March 1, with 11 hours, 2 minutes of daylight and the longest day is March 31, with 12 hours, 50 minutes of daylight.
Hours of Daylight and Twilight in March
The earliest sunrise of the month in Marietta-Alderwood is 6:33 AM on March 10 and the latest sunrise is 58 minutes later at 7:31 AM on March 11.
The earliest sunset is 5:54 PM on March 1 and the latest sunset is 1 hour, 46 minutes later at 7:39 PM on March 31.
Daylight saving time (DST) starts at 3:00 AM on March 11, 2018, shifting sunrise and sunset to be an hour later.
For reference, on June 21, the longest day of the year, the Sun rises at 5:06 AM and sets 16 hours, 10 minutes later, at 9:17 PM, while on December 21, the shortest day of the year, it rises at 8:00 AM and sets 8 hours, 15 minutes later, at 4:16 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in March
The chance that a given day will be muggy in Marietta-Alderwood is essentially constant during March, remaining around 0% throughout.
For reference, on August 4, the muggiest day of the year, there are muggy conditions 1% of the time, while on September 4, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in March
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Marietta-Alderwood is gradually decreasing during March, decreasing from 5.4 miles per hour to 4.9 miles per hour over the course of the month.
For reference, on December 4, the windiest day of the year, the daily average wind speed is 6.2 miles per hour, while on August 9, the calmest day of the year, the daily average wind speed is 2.8 miles per hour.
Average Wind Speed in March
Wind Direction in March
Marietta-Alderwood 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 Marietta-Alderwood is essentially constant during March, remaining within 1°F of 46°F throughout.
Average Water Temperature in March
The growing season in Marietta-Alderwood typically lasts for 7.3 months (224 days), from around March 26 to around November 4, rarely starting before February 25 or after April 19, and rarely ending before October 15 or after November 26.
During March in Marietta-Alderwood, the chance that a given day is within the growing season is rapidly increasing rising from 14% to 59% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in March
The average accumulated growing degree days in Marietta-Alderwood are essentially constant during March, remaining within 12°F of 29°F throughout.
Growing Degree Days in March
The average daily incident shortwave solar energy in Marietta-Alderwood is increasing during March, rising by 1.3 kWh, from 2.3 kWh to 3.6 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in March
For the purposes of this report, the geographical coordinates of Marietta-Alderwood are 48.790 deg latitude, -122.554 deg longitude, and 39 ft elevation.
The topography within 2 miles of Marietta-Alderwood contains only modest variations in elevation, with a maximum elevation change of 240 feet and an average elevation above sea level of 76 feet. Within 10 miles contains only modest variations in elevation (1,850 feet). Within 50 miles contains very significant variations in elevation (10,771 feet).
The area within 2 miles of Marietta-Alderwood is covered by cropland (31%), trees (25%), artificial surfaces (20%), and water (12%), within 10 miles by cropland (34%) and water (29%), and within 50 miles by trees (39%) and water (32%).
This report illustrates the typical weather in Marietta-Alderwood 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Marietta-Alderwood.
For each station, the records are corrected for the elevation difference between that station and Marietta-Alderwood 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 Marietta-Alderwood is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Marietta-Alderwood and a given station.
The stations contributing to this reconstruction are: Bellingham International Airport (90%, 1.3 kilometers, east); Orcas Island Airport (4.1%, 28 kilometers, west); White Rock Automatic Weather Reporting System (3.7%, 30 kilometers, northwest); and Bay View Airport (2.6%, 37 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .