This report describes the typical weather at the Skagit Regional Airport (Burlington/Mount Vernon, Washington, United States) weather station over the course of an average year. It is based on the historical records from 2003 to 2012. Earlier records are either unavailable or unreliable.
Burlington/Mount Vernon, Washington has a mediterranean climate with dry warm summers and mild winters. The area within 25 mi of this station is covered by forests (65%) and oceans and seas (32%).
Over the course of a year, the temperature typically varies from 35°F to 74°F and is rarely below 27°F or above 81°F.
The warm season lasts from June 25 to September 10 with an average daily high temperature above 68°F. The hottest day of the year is July 26, with an average high of 74°F and low of 53°F.
The cold season lasts from November 12 to March 7 with an average daily high temperature below 50°F. The coldest day of the year is December 7, with an average low of 35°F and high of 44°F.
The length of the day varies significantly over the course of the year. The shortest day is December 21 with 8:18 hours of daylight; the longest day is June 20 with 16:08 hours of daylight.
The earliest sunrise is at 5:07am on June 16 and the latest sunset is at 9:16pm on June 24. The latest sunrise is at 8:02am on December 30 and the earliest sunset is at 4:14pm on December 12.
Daylight savings time (DST) is observed in this location during 2012, starting in the spring on March 11 and ending in the fall on November 4.
The median cloud cover ranges from 33% (mostly clear) to 93% (mostly cloudy). The sky is cloudiest on December 21 and clearest on August 13. The clearer part of the year begins around June 10. The cloudier part of the year begins around September 25.
On August 13, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 60% of the time, and overcast or mostly cloudy 39% of the time.
On December 21, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 72% of the time, and clear or mostly clear 24% of the time.
There is either very little precipitation at this location, or the weather station does not reliably report the conditions.
Either snow is exceptionally unlikely to fall at any time during the year at this location or this station does not reliably report precipitation types.
The relative humidity typically ranges from 52% (mildly humid) to 100% (very humid) over the course of the year, rarely dropping below 41% (comfortable) and reaching as high as 100% (very humid).
The air is driest around July 26, at which time the relative humidity drops below 59% (mildly humid) three days out of four; it is most humid around September 1, exceeding 100% (very humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a year, the dew point typically varies from 32°F (dry) to 60°F (comfortable) and is rarely below 23°F (dry) or above 64°F (mildy humid).
The time of the year between May 10 and October 24 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of the year typical wind speeds vary from 0 mph to 14 mph (calm to moderate breeze), rarely exceeding 20 mph (fresh breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around March 19, at which time the average daily maximum wind speed is 14 mph (moderate breeze).
The lowest average wind speed of 5 mph (light breeze) occurs around September 12, at which time the average daily maximum wind speed is 11 mph (gentle breeze).