Average Weather in Sedro-Woolley Washington, United States
In Sedro-Woolley, the summers are short, comfortable, and partly cloudy and the winters are very cold, wet, and overcast. Over the course of the year, the temperature typically varies from 35°F to 76°F and is rarely below 23°F or above 85°F.
Based on the tourism score, the best time of year to visit Sedro-Woolley for warm-weather activities is from mid July to late August.
The warm season lasts for 2.8 months, from June 23 to September 16, with an average daily high temperature above 70°F. The hottest day of the year is August 3, with an average high of 76°F and low of 55°F.
The cool season lasts for 3.5 months, from November 14 to February 28, with an average daily high temperature below 51°F. The coldest day of the year is December 23, with an average low of 35°F and high of 44°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, 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 Sedro-Woolley, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Sedro-Woolley begins around June 21 and lasts for 3.5 months, ending around October 3. On August 3, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 71% of the time, and overcast or mostly cloudy 29% of the time.
The cloudier part of the year begins around October 3 and lasts for 8.6 months, ending around June 21. On November 30, the cloudiest day of the year, the sky is overcast or mostly cloudy 75% of the time, and clear, mostly clear, or partly cloudy 25% of the time.
Cloud Cover Categories
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. The chance of wet days in Sedro-Woolley varies very significantly throughout the year.
The wetter season lasts 6.5 months, from October 9 to April 24, with a greater than 35% chance of a given day being a wet day. The chance of a wet day peaks at 61% on November 18.
The drier season lasts 5.5 months, from April 24 to October 9. The smallest chance of a wet day is 10% on August 1.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 60% on November 18.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Sedro-Woolley experiences extreme seasonal variation in monthly rainfall.
Rain falls throughout the year in Sedro-Woolley. The most rain falls during the 31 days centered around November 20, with an average total accumulation of 9.2 inches.
The least rain falls around July 31, with an average total accumulation of 0.9 inches.
Average Monthly Rainfall
The sliding 31-day liquid-equivalent quantity of snowfall in Sedro-Woolley does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Sedro-Woolley varies extremely over the course of the year. In 2018, the shortest day is December 21, with 8 hours, 18 minutes of daylight; the longest day is June 21, with 16 hours, 8 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:06 AM on June 16, and the latest sunrise is 2 hours, 54 minutes later at 8:00 AM on December 31. The earliest sunset is at 4:13 PM on December 11, and the latest sunset is 5 hours, 1 minute later at 9:14 PM on June 25.
Daylight saving time (DST) is observed in Sedro-Woolley during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.
Sunrise & Sunset with Twilight and Daylight Saving Time
The perceived humidity level in Sedro-Woolley, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Sedro-Woolley experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 6.0 months, from October 14 to April 14, with average wind speeds of more than 4.1 miles per hour. The windiest day of the year is December 4, with an average hourly wind speed of 5.6 miles per hour.
The calmer time of year lasts for 6.0 months, from April 14 to October 14. The calmest day of the year is August 6, with an average hourly wind speed of 2.7 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Sedro-Woolley varies throughout the year.
The wind is most often from the south for 1.3 months, from March 14 to April 23, with a peak percentage of 39% on March 24. The wind is most often from the west for 5.0 months, from April 23 to September 22, with a peak percentage of 56% on June 23. The wind is most often from the east for 5.7 months, from September 22 to March 14, with a peak percentage of 56% on January 1.
Sedro-Woolley 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 water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 3.0 months, from June 21 to September 19, with an average temperature above 54°F. The day of the year with the warmest water is August 2, with an average temperature of 56°F.
The time of year with cooler water lasts for 4.2 months, from December 1 to April 8, with an average temperature below 48°F. The day of the year with the coolest water is January 29, with an average temperature of 46°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Sedro-Woolley throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Sedro-Woolley for general outdoor tourist activities is from mid July to late August, with a peak score in the first week of August.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Sedro-Woolley for hot-weather activities is from mid July to mid August, with a peak score in the first week of August.
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
The growing season in Sedro-Woolley typically lasts for 7.5 months (231 days), from around March 24 to around November 10, rarely starting before February 27 or after April 22, and rarely ending before October 21 or after December 1.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Sedro-Woolley should appear around April 23, only rarely appearing before April 6 or after May 14.
Growing Degree Days
The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.2 months, from May 15 to August 21, with an average daily incident shortwave energy per square meter above 5.4 kWh. The brightest day of the year is July 21, with an average of 6.6 kWh.
The darker period of the year lasts for 3.9 months, from October 23 to February 19, with an average daily incident shortwave energy per square meter below 2.0 kWh. The darkest day of the year is December 25, with an average of 0.8 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Sedro-Woolley are 48.504 deg latitude, -122.236 deg longitude, and 56 ft elevation.
The topography within 2 miles of Sedro-Woolley contains very significant variations in elevation, with a maximum elevation change of 1,109 feet and an average elevation above sea level of 102 feet. Within 10 miles contains very significant variations in elevation (4,268 feet). Within 50 miles also contains extreme variations in elevation (10,771 feet).
The area within 2 miles of Sedro-Woolley is covered by cropland (59%), artificial surfaces (21%), and herbaceous vegetation (13%), within 10 miles by trees (43%) and cropland (28%), and within 50 miles by trees (44%) and water (25%).
This report illustrates the typical weather in Sedro-Woolley, 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 Sedro-Woolley.
For each station, the records are corrected for the elevation difference between that station and Sedro-Woolley 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 Sedro-Woolley is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Sedro-Woolley and a given station.
The stations contributing to this reconstruction are: Bay View Airport (69%, 14 kilometers, west); Arlington Municipal Airport (15%, 39 kilometers, south); and Bellingham International Airport (15%, 39 kilometers, northwest).
Time zones for aiports and weather stations are provided by AskGeo.com .