Annette Island Airport, Alaska climate: Climate normals at a NOAA weather station
Annette Island Airport's normal year runs from 33°F January nights to 66°F August afternoons, with 103.5 inches of precipitation and 35 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.7°C, January lows of 0°C, August highs of 19°C, 2,629 mm of precipitation a year.
- NOAA stationAnnette Island Airport
- Station IDUSW00025308
- Location55.04°N 131.58°W
- Elevation109 ft (33 m)
On October 8, the normal high in Annette Island Airport is 56°F and the normal low 44°F, and the chance of measurable rain or snow is 72%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Annette Island Airport.
- Jan 43° 33°
- Feb 44° 33°
- Mar 46° 34°
- Apr 52° 39°
- May 59° 45°
- Jun 63° 50°
- Jul 66° 54°
- Aug 66° 54°
- Sep 61° 49°
- Oct 54° 42°
- Nov 47° 37°
- Dec 43° 34°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Annette Island Airport each month?
August is the warmest month, with normal highs of 66°F; January the coldest, with normal lows of 33°F. The most precipitation falls in October (12.87 in), the least in June (5.09 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 43°F | 33°F | 37.7°F | 10.43 | 7.0 | 22 | <1 | 14 | 7 h 40 min |
| February | 44°F | 33°F | 38.3°F | 7.71 | 7.3 | 18 | <1 | 14 | 9 h 40 min |
| March | 46°F | 34°F | 40.1°F | 7.88 | 7.8 | 22 | <1 | 12 | 11 h 40 min |
| April | 52°F | 39°F | 45.4°F | 7.18 | 1.0 | 19 | <1 | 3 | 14 h |
| May | 59°F | 45°F | 51.7°F | 5.55 | 0.0 | 15 | <1 | <1 | 16 h 10 min |
| June | 63°F | 50°F | 56.4°F | 5.09 | 0.0 | 16 | <1 | <1 | 17 h 20 min |
| July | 66°F | 54°F | 59.7°F | 5.17 | 0.0 | 15 | <1 | <1 | 16 h 50 min |
| August | 66°F | 54°F | 60.0°F | 7.92 | 0.0 | 16 | <1 | <1 | 15 h |
| September | 61°F | 49°F | 55.1°F | 10.16 | 0.0 | 20 | <1 | <1 | 12 h 50 min |
| October | 54°F | 42°F | 47.9°F | 12.87 | 0.0 | 23 | <1 | 2 | 10 h 40 min |
| November | 47°F | 37°F | 41.7°F | 12.55 | 3.6 | 23 | <1 | 9 | 8 h 30 min |
| December | 43°F | 34°F | 38.3°F | 11.00 | 8.1 | 23 | <1 | 14 | 7 h 10 min |
| Year (annual) | 54°F | 42°F | 47.7°F | 103.51 | 34.8 | 231 | <1 | 68 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 6°C | 0°C | 3.2°C | 265 mm | 18 cm |
| February | 7°C | 0°C | 3.5°C | 196 mm | 19 cm |
| March | 8°C | 1°C | 4.5°C | 200 mm | 20 cm |
| April | 11°C | 4°C | 7.4°C | 182 mm | 3 cm |
| May | 15°C | 7°C | 10.9°C | 141 mm | 0 cm |
| June | 17°C | 10°C | 13.6°C | 129 mm | 0 cm |
| July | 19°C | 12°C | 15.4°C | 131 mm | 0 cm |
| August | 19°C | 12°C | 15.6°C | 201 mm | 0 cm |
| September | 16°C | 10°C | 12.8°C | 258 mm | 0 cm |
| October | 12°C | 6°C | 8.8°C | 327 mm | 0 cm |
| November | 8°C | 3°C | 5.4°C | 319 mm | 9 cm |
| December | 6°C | 1°C | 3.5°C | 279 mm | 21 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00025308; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
Which months are mildest at Annette Island Airport?
Normal highs sit between 65°F and 85°F in July and August. Of those, July has the fewest days with rain (15).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00025308.
When is the last frost at Annette Island Airport?
In Annette Island Airport, the last spring frost (32°F) comes after April 4 in half of years and after April 22 in one year in ten; the first autumn frost comes before October 31 in half of years and before October 15 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 41 year in 10 after April 22; 9 in 10 after March 20
- First autumn frost, half of years before
- October 311 year in 10 before October 15; 9 in 10 before November 20
NOAA puts the median frost-free season at 208 days, and the season without a hard freeze (28°F) at 246 days.
A hard freeze (28°F) comes after March 16 in half of springs and before November 18 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Annette Island Airport in zone 8a in ZIP code 99926, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 8a: the coldest night of a typical year reaches 11°F (26 complete years).
Frost dates for every NOAA station in Alaska · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00025308; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get at Annette Island Airport?
In a normal year in Annette Island Airport, a 90°F day is rare, 68 nights fall to 32°F or colder and 231 days bring measurable precipitation.
- Days at 90°F or more
- fewer than 1a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 68a normal year
- Days that stay below freezing
- 9high of 32°F or less
- Days with 0.01 inch of precipitation
- 231a normal year
- Days with 1 inch of snow or more
- 11a normal year
The highest temperature in this station's record (since 1941) is 93°F, on June 19, 2004; the lowest is −4°F, on January 30, 1947.
The wettest calendar year on that record is 1959, with 189.90 in; the snowiest season is 1971–72, with 136.7 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USW00025308; records: ACIS (NOAA Regional Climate Centers), station USW00025308. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Annette Island Airport?
Over a year 55% of the sunlight that would reach the ground under clear skies gets through the clouds at Annette Island Airport, 2.4 kWh per square metre a day. May is the sunniest month (59%) and November the cloudiest (44%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 45% | 0.5 |
| February | 56% | 1.3 |
| March | 54% | 2.2 |
| April | 58% | 3.6 |
| May | 59% | 4.5 |
| June | 55% | 4.6 |
| July | 54% | 4.2 |
| August | 57% | 3.6 |
| September | 54% | 2.4 |
| October | 50% | 1.3 |
| November | 44% | 0.6 |
| December | 45% | 0.3 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How many heating and cooling degree days does Annette Island Airport record?
A normal year at Annette Island Airport brings 6,325 heating degree days, 18% more than the median U.S. place (5,373), and 28 cooling degree days, 97% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 1,101 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 846 | 0 |
| February | 746 | 0 |
| March | 773 | 0 |
| April | 590 | 0 |
| May | 413 | 1 |
| June | 263 | 5 |
| July | 175 | 11 |
| August | 164 | 11 |
| September | 297 | 0 |
| October | 529 | 0 |
| November | 701 | 0 |
| December | 828 | 0 |
| Year (annual) | 6,325 | 28 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00025308. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Have recent years at Annette Island Airport been warmer than normal?
Over 62 complete years from 1942 to 2017, the station's annual mean temperature rose at a fitted 2.9°F per century (+0.16°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Annette Island Airport's climate compare?
Annette Island Airport is warmer than 85 of the 85 places with their own NOAA record in Alaska, and wetter than 66. Across the 7,247 U.S. stations with normals, its annual mean of 47.7°F is warmer than 31%.
In the Köppen classification computed from these normals, Annette Island Airport is Cfb: temperate, no dry season, warm summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Questions about Annette Island Airport's climate
What is the coldest month at Annette Island Airport?
January, with a normal high of 43°F and a normal low of 33°F. The warmest is August (66°F by day, 54°F at night).
Does it snow at Annette Island Airport?
Yes: 35 inches in a normal year, falling on 24 days with 0.1 inch or more, the most in December (8.1 inches).
What is the rainiest month at Annette Island Airport?
October, with 12.87 in of precipitation in a normal year; the driest is June with 5.09 in.
What plant hardiness zone is Annette Island Airport in?
The USDA's 2023 map puts Annette Island Airport in zone 8a in ZIP code 99926, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 11°F (26 years, 1991-2020): zone 8a.
How late can frost come at Annette Island Airport?
In half of years the last 32°F night comes after April 4; in one year in ten it comes after April 22. Waiting until April 22 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Alaska climateThe statewide normals and every place in the state
- Metlakatla, AK1 miles from this station, 45.7°F a year
- Ketchikan, AK22 miles from this station, 46.0°F a year
- Thorne Bay, AK58 miles from this station, 44.2°F a year
- Craig, AK68 miles from this station, 44.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made