Climate Comfort Score
58/100
Moderate
NOAA 1991–2020 normals 51°F annual avg Public-domain federal data
Friday Harbor, WA Climate
Temperature, precipitation, and comfort score from NOAA NCEI 1991–2020 normals →
- 51°F
- Avg annual temp
- 58/100
- Comfort score
- 18.5"
- Annual precip
- 229d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Friday Harbor
Friday Harbor, Washington averages 51°F a year and scores 58/100 on the comfort index - moderate, milder than 38% of U.S. cities.
- 51°F
- average temperature, NOAA 1991-2020 normal
- 58/100
- comfort score, milder than 38% of U.S. cities
- 18.5"
- annual precipitation
- 229 days
- frost-free growing season
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
51°F (11°C)
Avg High
59°F
Avg Low
43°F
Annual Precip
18.5"
Comfort Score
58/100
Moderate
Avg Annual Temperature
51°F
30-year mean (NOAA NCEI)
Annual Precipitation
18.5"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Friday Harbor) 58.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Moderate for the Friday Harbor area.
How Friday Harbor compares to every U.S. city
Friday Harbor's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
58 Top 62% higher than 38% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for Friday Harbor
MethodologyFriday Harbor's NOAA 1991-2020 normal sits inside a longer story: U.S. land temperatures have been tracking (and drifting from) the global mean since 1900, and the chart below shows that spread, with the most recent decade running warmer than the 30-year mean.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 47°F (8°C) | 37°F (3°C) | 42°F (6°C) | 2.7" | 8.1 | 0.0 |
| February | 49°F (9°C) | 37°F (3°C) | 43°F (6°C) | 1.5" | 9.0 | 0.0 |
| March | 53°F (11°C) | 38°F (4°C) | 46°F (8°C) | 1.4" | 5.9 | 0.0 |
| April | 57°F (14°C) | 41°F (5°C) | 49°F (10°C) | 1.0" | 2.4 | 0.0 |
| May | 64°F (18°C) | 44°F (7°C) | 54°F (12°C) | 1.1" | 0.3 | 0.0 |
| June | 68°F (20°C) | 48°F (9°C) | 58°F (15°C) | 0.8" | 0.0 | 0.0 |
| July | 72°F (22°C) | 50°F (10°C) | 61°F (16°C) | 0.5" | 0.0 | 0.3 |
| August | 73°F (23°C) | 50°F (10°C) | 62°F (16°C) | 0.7" | 0.0 | 0.2 |
| September | 68°F (20°C) | 48°F (9°C) | 58°F (14°C) | 1.0" | 0.0 | 0.0 |
| October | 59°F (15°C) | 44°F (7°C) | 51°F (11°C) | 2.3" | 0.6 | 0.0 |
| November | 51°F (11°C) | 40°F (4°C) | 45°F (7°C) | 3.0" | 5.1 | 0.0 |
| December | 46°F (8°C) | 37°F (3°C) | 42°F (5°C) | 2.5" | 8.8 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January 2.7"
16.7 days with precipitation
February 1.5"
13.8 days with precipitation
March 1.4"
14.3 days with precipitation
April 1.0"
10.3 days with precipitation
May 1.1"
9.6 days with precipitation
June 0.8"
7.5 days with precipitation
July 0.5"
5.0 days with precipitation
August 0.7"
7.7 days with precipitation
September 1.0"
11.8 days with precipitation
October 2.3"
15.2 days with precipitation
November 3.0"
16.3 days with precipitation
December 2.5"
15.9 days with precipitation
Frost Dates & Growing Season
First Fall Freeze
November 10
50% probability date
Last Spring Freeze
March 26
50% probability date
Growing Season
229 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,171
Higher = more heating needed
Cooling Degree Days
32
Higher = more cooling needed
Warmest Month
August
Coldest Month
December
What Friday Harbor's climate means for you
Friday Harbor runs 51°F a year - peaking in August, coldest in December.
- Gardeners get about 229 frost-free days, with the last spring freeze near March 26 - plan the planting calendar around it, not the regional average.
- Energy bills track 5,171 heating and 32 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: Friday Harbor, WA
The NOAA 1991–2020 climate normals describe Friday Harbor, Washington as a location with an annual average temperature of 51°F, ranging from a mean daily high of 59°F to a mean daily low of 43°F. August is typically the warmest month of the year, while December is the coldest. These thirty-year averages, computed from station USW00094276, smooth out year-to-year variability and give a baseline expectation for typical conditions in any given month.
Beyond temperature, Friday Harbor averages 18.5 inches of precipitation annually, predominantly as rainfall - a real factor for anyone planning to live, garden, or travel here. The frost-free season averages 229 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near March 26 and the first fall freeze near November 10. Turning to energy use, 5,171 heating degree days and 32 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Friday Harbor scores 58/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Use the monthly tables above to plan around specific windows, shoulder seasons for mild highs and lows, peak summer for August-driven heat, or deep winter for December-driven cold. All figures here are thirty-year averages: any single year may run warmer, wetter, drier, or cooler than the normal, so treat them as planning guidance rather than forecasts.
Frequently Asked Questions
What is the average temperature in Friday Harbor, WA? ▼
The average annual temperature in Friday Harbor, Washington is 51°F. The warmest month averages 73°F (23°C) and the coldest averages 37°F (3°C).
How much rain does Friday Harbor get? ▼
Friday Harbor receives 18.5 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Friday Harbor? ▼
Friday Harbor has a climate comfort score of 58/100 (Moderate), milder than 38% of U.S. cities in the PlainClimate database.
When is the growing season in Friday Harbor? ▼
Friday Harbor has approximately 229 frost-free days per year, with the last spring freeze around March 26 and the first fall freeze around November 10.
How much energy does heating and cooling require in Friday Harbor? ▼
Friday Harbor has 5,171 heating degree days and 32 cooling degree days annually, a heating-dominated climate. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this Friday Harbor climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USW00094276 near Friday Harbor.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USW00094276. For informational purposes only.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.