Climateby Month

Friday Harbor, WA climate by month

NOAA 1991-2020 normals · 58 ft elevation

Friday Harbor has mild summers and chilly winters. Highs peak at 73°F in August and fall to 46°F in December. The wettest month is January (about 17 wet days) and the driest is July (about 5). Normal snowfall is about 5.8 in a year. By our comfort score the best months are July and August.

Warmest month
73°F
August normal high
Coldest month
37°F
February normal low
Wet days a year
143
18.5 in of precipitation
Snow a year
5.8 in
normal snowfall

How warm is Friday Harbor?

Normal highs range from 46°F in December to 73°F in August.

30°40°50°60°70°80° January: normal high 47°F (8°C), low 37°F (3°C) February: normal high 49°F (9°C), low 37°F (3°C) March: normal high 53°F (12°C), low 38°F (3°C) April: normal high 57°F (14°C), low 41°F (5°C) May: normal high 64°F (18°C), low 44°F (7°C) June: normal high 68°F (20°C), low 48°F (9°C) July: normal high 72°F (22°C), low 50°F (10°C) August: normal high 73°F (23°C), low 50°F (10°C) 73° 50° September: normal high 68°F (20°C), low 48°F (9°C) October: normal high 59°F (15°C), low 44°F (7°C) November: normal high 51°F (11°C), low 40°F (4°C) December: normal high 46°F (8°C), low 37°F (3°C) 46° 37° JFMAMJJASOND

Bars run from the normal low to the normal high for each month.

How rainy is Friday Harbor?

January has the most wet days (about 17); the year brings about 18 in of precipitation.

January: 17 wet days 17 February: 14 wet days March: 14 wet days April: 10 wet days May: 10 wet days June: 8 wet days July: 5 wet days 5 August: 7 wet days September: 12 wet days October: 15 wet days November: 16 wet days December: 16 wet days JFMAMJJASOND

Wet day: at least 0.01 in of rain or melted snow, counted from daily records 1991-2020.

How much does it snow?

Normal snowfall is 5.8 in a year, most of it in December.

January: 1.8 in of snow February: 0.4 in of snow March: 0.1 in of snow April: 0.0 in of snow 0.0 May: 0.0 in of snow June: 0.0 in of snow July: 0.0 in of snow August: 0.0 in of snow September: 0.0 in of snow October: 0.1 in of snow November: 0.6 in of snow December: 2.8 in of snow 2.8 JFMAMJJASOND

How humid is Friday Harbor?

Muggy days (dew point 65°F or higher) are rare in any month.

January: 0 muggy days 0 February: 0 muggy days March: 0 muggy days April: 0 muggy days May: 0 muggy days June: 0 muggy days July: 0 muggy days August: 0 muggy days September: 0 muggy days October: 0 muggy days November: 0 muggy days December: 0 muggy days JFMAMJJASOND

Muggy day: daily mean dew point of 65°F or higher, from hourly observations 1991-2020 at Bellingham Intl Airport, 28 mi NE of the city center (the nearest airport with complete hourly records).

How much daylight?

Daylight ranges from about 8.4 hours in December to 16.1 hours in June.

January: 8.8 hours of daylight February: 10.2 hours of daylight March: 11.9 hours of daylight April: 13.7 hours of daylight May: 15.3 hours of daylight June: 16.1 hours of daylight 16.1 July: 15.7 hours of daylight August: 14.3 hours of daylight September: 12.6 hours of daylight October: 10.8 hours of daylight November: 9.2 hours of daylight December: 8.4 hours of daylight 8.4 JFMAMJJASOND
See all numbers
Monthly climate normals and day counts for Friday Harbor, 1991-2020
MonthHighLowPrecip.Wet daysSnowMuggy daysDaylight
January 47°F37°F 2.7 in17 1.8 in 0 8.8 h
February 49°F37°F 1.5 in14 0.4 in 0 10.2 h
March 53°F38°F 1.4 in14 0.1 in 0 11.9 h
April 57°F41°F 1.0 in10 0.0 in 0 13.7 h
May 64°F44°F 1.1 in10 0.0 in 0 15.3 h
June 68°F48°F 0.8 in8 0.0 in 0 16.1 h
July 72°F50°F 0.5 in5 0.0 in 0 15.7 h
August 73°F50°F 0.7 in7 0.0 in 0 14.3 h
September 68°F48°F 1.0 in12 0.0 in 0 12.6 h
October 59°F44°F 2.3 in15 0.1 in 0 10.8 h
November 51°F40°F 3.0 in16 0.6 in 0 9.2 h
December 46°F37°F 2.5 in16 2.8 in 0 8.4 h

High and low: NOAA 1991-2020 normal daily high and low. Wet days: at least 0.01 in of rain or melted snow. Muggy days: daily mean dew point 65°F or higher.

Best months to visit Friday Harbor

By our comfort score, the best months are July and August.

Comfort score by month (0-100) and its parts, in days per month
MonthScoreComfortableNotable rainHot or cold
Jan 36084
Feb 43042
Mar 49051
Apr 57330
May 701030
Jun 831820
Jul 912510
Aug 902620
Sep 782030
Oct 48360
Nov 39071
Dec 37074

Score = 40 × share of comfortable days + 25 × share of days without notable rain + 20 × share of days neither hot (90°F+) nor cold (high 40°F or below) + 15 × daylight. How the score works.

Frost dates in Friday Harbor

The last spring frost typically comes around Mar 26, and the first fall frost around Nov 10, leaving 230 frost-free days in a typical year.

Frost and freeze dates for Friday Harbor
Typical date1 year in 10
Last spring frost (32°F)Mar 26after Apr 21
First fall frost (32°F)Nov 10before Oct 21
Last hard freeze (28°F)Feb 22after Mar 18
First hard freeze (28°F)Dec 1before Nov 7
Frost-free season230 daysunder 197 days

"Typical" is the date with a 50% chance of a later spring frost (or earlier fall frost). Planting after the "1 year in 10" spring date gives a 90% chance of no further frost. The Old Farmer's Almanac publishes 30% dates, which fall between our typical and 1-in-10 dates.

Station: Friday Harbor Airport (USW00094276), NOAA 1991-2020 freeze probabilities. Frost dates for every city in Washington.

Hottest and coldest readings, 1991-2020

The highest reading was 97°F (July 29, 2009); the lowest was 8°F (December 20, 2008).

From the temperature station's daily records with NOAA quality flags removed. Not an all-time record.

Near Friday Harbor

Similar climates elsewhere

Where the numbers come from

  • Temperature, rain and frost dates: Friday Harbor Airport (USW00094276), 0.9 mi SSW of the city center, 109 ft (51 ft higher than the city). NOAA normals and daily records, 1991-2020.
  • Snowfall and snow depth: Olga 2 Se (USC00456096), 11 mi ENE of the city center, 80 ft . NOAA normals and daily records, 1991-2020.
  • Humidity and wind by hour: Bellingham Intl Airport (USW00024217), 28 mi NE of the city center, 149 ft (91 ft higher than the city). NOAA normals and daily records, 1991-2020.
  • Daily humidity and wind: Bellingham Intl Airport (727976-24217), 28 mi NE of the city center, 151 ft (93 ft higher than the city). Hourly observations, 1991-2020.
  • Not available for this location: cloud cover (no station close enough or similar enough in elevation).

Distances from the city center (USGS). Methodology · Report an error