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.

Daily High and Low Temperature

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The daily average low (blue) and high (red) temperature with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

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.

Fraction of Time Spent in Various Temperature Bands

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The average fraction of time spent in various temperature bands: frigid (below 15°F), freezing (15°F to 32°F), cold (32°F to 50°F), cool (50°F to 65°F), comfortable (65°F to 75°F), warm (75°F to 85°F), hot (85°F to 100°F) and sweltering (above 100°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.

Daily Hours of Daylight and Twilight

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The number of hours during which the Sun is visible (black line), with various degrees of daylight, twilight, and night, indicated by the color bands. From bottom (most yellow) to top (most gray): full daylight, solar twilight (Sun is visible but less than 6° from the horizon), civil twilight (Sun is not visible but is less than 6° below the horizon), nautical twilight (Sun is between 6° and 12° below the horizon), astronomical twilight (Sun is between 12° and 18° below the horizon), and full night.

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.

Daily Sunrise & Sunset with Twilight and Daylight Savings Time

The solar day over the course of the year 2012 . From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (solar, civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight savings time are indicated by the "DST" labels.

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.

Median Cloud Cover

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The median daily cloud cover (black line) with percentile bands (inner band from 40th to 60th percentile, outer band from 25th to 75th percentile).

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.

Cloud Cover Types

The fraction of time spent in each of the five sky cover categories. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.

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.

Relative Humidity

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The average daily high (blue) and low (brown) relative humidity with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

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.

Dew Point

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The daily average low (blue) and high (red) dew point with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

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).

Wind Speed

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The average daily minimum (red), maximum (green), and average (black) wind speed with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

Wind Directions Over the Entire Year

The fraction of time spent with the wind blowing from the various directions over the entire year. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.

Fraction of Time Spent with Various Wind Directions

The fraction of time spent with the wind blowing from the various directions on a daily basis. Stacked values do not always sum to 100% because the wind direction is undefined when the wind speed is zero.