Sitka Airport, AK Climate: Temperature & Rain by Month
Explore NOAA NCEI's 1991–2020 climate normals → and a clearly labeled PlainClimate comfort calculation
30-year climate normals (1991-2020) from Sitka Airport's primary NOAA station, SITKA AIRPORT.
The climate verdict for Sitka Airport
Water is the standout signal in Sitka Airport, Alaska: 84.5 inches of precipitation in a normal year. Against that wet profile, NOAA records an annual average of 45°F. At 45/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 16% of scores.
- 45°F
- yearly average temperature, NOAA normal
- 45/100
- comfort score, above 16% of station-mapped location scores
- 84.5"
- yearly precipitation total
- 203 days
- frost-free days per growing season
Sitka Airport: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00025333 · Sitka Airport, AK 45°F mean · 84.5" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-WET · SWING-NARROW · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 45°F
- RANK-COOL #1,372
- PHOTO-FINISH ≈ Klawock
- PRCP-WET 84.5"
- SWING-NARROW 21°F
- COMF-LOW 45/100
- LOAD-HEAT 7,124 HDD
- STN-1 USW00025333
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Klawock, AK ( -0.2 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every AK station list.
- Hot Cloudcroft, NM 46°F
- Near Gascon, NM 46°F
- Near Port Alexander, AK 46°F
- Sitka Airport (this station) 45°F
- Cold Klawock, AK 45°F
Sitka Airport sits in Alaska, the #1 coldest U.S. state at 33.5°F statewide annual average - see all 50 coldest states ranked by NOAA normals
Climate Living Index · Sitka Airport
Sitka Airport: 56/100 · grade C
Sitka Airport publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals · NOAA hourly normals); 1 missing weight rescale to 100.
PlainClimate-derived for Sitka Airport, not an official NOAA rating. Rankings still use Comfort Score 45/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 26 calendar days | 97/100 · A |
| Summer moisture balance | 51.2°F mean dew point | 94/100 · A |
| Frost-free season | 203 days/year | 66/100 · C |
| Annual temperature balance | 45.4°F · 22.1° from 67.5°F | 21/100 · F |
| Precipitation balance | 84.5 in · 49.5 from 35 in | 0/100 · F |
Sitka Airport · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Sitka Airport is a temperate Köppen climate: Cfb
Coldest-month mean 36.5°F and warmest-month mean 57.3°F place this station in temperate, no dry season, warm summer climates (Cfb). Class Cfb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, no dry season, warm summer.
- Köppen code
- Cfb
- Group
- Temperate
- Warmest month
- 57.3°F
- Coldest month
- 36.5°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Sitka Airport sits across the climate record
Three NOAA fields for Sitka Airport's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 80%
- Among 6,861 stations, Sitka Airport sits in the cooler third of annual means.
- Annual precipitation
- Top 1% wettest
- Sitka Airport's annual total ranks in the wetter third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 96%
- Warmest-to-coldest month gap for Sitka Airport is compact versus 6,861 complete station-years.
How Sitka Airport compares across U.S. station-mapped locations
Sitka Airport's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
45 16th percentile score exceeds 16% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). This entry sits in this band.
- 50–60: 1,329 station-mapped locations (21%). Above this entry.
- 60–70: 1,236 station-mapped locations (20%). Above this entry.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Sitka Airport's measured station temperature trend
MethodologyAcross 73 complete annual observations from 1948 to 2024, SITKA AIRPORT warmed at a fitted rate of 0.17°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Sitka Airport primary station fitted change +0.17 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 41°F (5°C) | 32°F (0°C) | 37°F (3°C) | 8.2" | 13.7 | 0.0 |
| February | 41°F (5°C) | 32°F (0°C) | 37°F (3°C) | 5.9" | 14.0 | 0.0 |
| March | 43°F (6°C) | 33°F (0°C) | 38°F (3°C) | 5.6" | 14.4 | 0.0 |
| April | 48°F (9°C) | 37°F (3°C) | 43°F (6°C) | 4.3" | 4.6 | 0.0 |
| May | 53°F (12°C) | 43°F (6°C) | 48°F (9°C) | 3.8" | 0.2 | 0.0 |
| June | 58°F (14°C) | 48°F (9°C) | 53°F (12°C) | 2.9" | 0.0 | 0.0 |
| July | 60°F (16°C) | 53°F (11°C) | 57°F (14°C) | 4.6" | 0.0 | 0.0 |
| August | 62°F (17°C) | 53°F (12°C) | 57°F (14°C) | 7.3" | 0.0 | 0.0 |
| September | 58°F (14°C) | 49°F (9°C) | 53°F (12°C) | 11.7" | 0.0 | 0.0 |
| October | 51°F (10°C) | 42°F (5°C) | 46°F (8°C) | 11.8" | 1.9 | 0.0 |
| November | 44°F (7°C) | 36°F (2°C) | 40°F (4°C) | 9.9" | 8.3 | 0.0 |
| December | 42°F (5°C) | 33°F (1°C) | 38°F (3°C) | 8.4" | 12.4 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 62°F around August 8, short of 90°F on every date, while 26 dates carry a normal low at or below freezing, the coldest 32°F near February 28.
The freezing stretch
Freezing normal lows persist into March 13, covering 26 dates.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
Where the wet dates fall
The likeliest wet date is October 5, when 78% of years recorded at least a hundredth of an inch. The driest is May 15 at 54%. Summed across the calendar, that is about 236 wet dates a year.
The widest day
April 10 carries the biggest normal gap between afternoon and dawn, 11°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Sitka Airport.
Where Sitka Airport Stands Nationally
This is one of the wettest normals climates ranked: about 85 inches of precipitation in a normal year, a total fewer than one station in ten surpasses.
Among the steadiest day-night climates ranked: even the widest normal daily swing holds to roughly 11°F.
Sitka Airport earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall
21.2 days with precipitation
16.9 days with precipitation
18.4 days with precipitation
17.5 days with precipitation
16.4 days with precipitation
16.7 days with precipitation
18.9 days with precipitation
19.4 days with precipitation
22.4 days with precipitation
23.7 days with precipitation
22.0 days with precipitation
21.6 days with precipitation
Sitka Airport spreads its precipitation across the year
Neither half of the year dominates here: June through August take 18% of the annual total and December through February 27%, with neither reaching the 35% that would mark a distinct wet season. Sitka Airport has no dry season to plan around, though it does carry an unusually narrow 20.8°F seasonal spread.
The gap between the wettest and driest month still matters: October averages 11.8" and June 2.9". The three wettest months together take 40% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
When it rains in Sitka Airport, it arrives in quantity
84.5" of precipitation falls across only about 235 wet days here, averaging 0.36 inches each. Fewer days carry more water: the year's total is delivered in comparatively heavy events rather than persistent damp.
- Days with measurable precipitation
- about 235 a year, 64% of all days
- Average depth per wet day
- 0.36 inches
- Most wet days
- October, about 24
- Fewest wet days
- May, about 16
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, and a per-day average is not a forecast of any individual storm.
Frost Dates & Growing Season
First Fall Freeze
November 1
50% probability date
Last Spring Freeze
April 12
50% probability date
Growing Season
203 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
7,124
Higher = more heating needed
Cooling Degree Days
1
Higher = more cooling needed
Warmest Month
August
Coldest Month
January
Humidity & Wind
Monthly averages from hourly observations
| Month | Humidity | Wind (mph) | Clear Sky % | Overcast % |
|---|---|---|---|---|
| January | 77% | 8.8 | 21% | 61% |
| February | 71% | 8.1 | 33% | 49% |
| March | 74% | 7.9 | 22% | 51% |
| April | 74% | 7.7 | 26% | 53% |
| May | 81% | 6.8 | 21% | 59% |
| June | 84% | 6.2 | N/A | N/A |
| July | 86% | 5.9 | N/A | N/A |
| August | 85% | 6.1 | N/A | N/A |
| September | 83% | 7.4 | 18% | 60% |
| October | 78% | 8.9 | 16% | 55% |
| November | 77% | 9.6 | N/A | N/A |
| December | 75% | 9.4 | 27% | 53% |
Nationwide similar cities
Other rankable U.S. places outside AK closest to Sitka Airport on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (45°F here).
- Alberton, MT 45°F · 0.0°F off
- Augusta, MT 45°F · 0.0°F off
- Beloit, WI 45°F · 0.0°F off
- Deadwood, SD 45°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (84.5" here), excluding temperature-peer places.
- Aberdeen, WA 84.9" · 0.5" off
- Mapleton, OR 84.0" · 0.5" off
- Raymond, WA 83.7" · 0.8" off
- Darrington, WA 83.0" · 1.5" off
Data-derived climate profile
How Sitka Airport's climate pattern fits together
heating led · wet · low swing
Heating is the larger measured load in Sitka Airport, at 7,124 degree days versus 1 for cooling. Unlike a strongly continental record, however, its 20.8°F month-to-month range is compact; persistent cool-season demand matters more than a dramatic summer-to-winter reversal.
Sitka Airport's frost-free season lasts about 203 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
Sitka Airport's 20.8°F seasonal spread is compact even though precipitation is abundant. August and January mark the typical warm and cold ends of the calendar. The annual average is 45°F. Temperature is relatively steady; the monthly rows show how rain and snow observations vary across the calendar.
Alongside its heating load, Sitka Airport carries 84.5 inches of precipitation in a normal year, inside PlainClimate's wet range. Snowfall is not added to the interpretation because its annual value is missing. That distinction matters because a wet annual total can arrive as rain, snow, or a mixture at different times.
These labels group NOAA 1991-2020 normals from Sitka Airport's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for Sitka Airport, not an official NOAA class or a year-ahead forecast.
Questions about Sitka Airport's climate
How much rain does Sitka Airport get? ▼
How much energy does heating and cooling require in Sitka Airport? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Sitka Airport's primary station: SITKA AIRPORT (USW00025333). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Sitka Airport; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Sitka Airport comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.