Snettisham Power Plant, Alaska climate: Climate normals at a NOAA weather station
Snettisham Power Plant's normal year runs from 22°F January nights to 63°F July afternoons, with 189.7 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 5.0°C, January lows of −6°C, July highs of 17°C, 4,818 mm of precipitation a year.
- NOAA stationSnettisham Power Plant
- Station IDUSC00508584
- Location58.14°N 133.74°W
- Elevation29 ft (9 m)
On October 23, the normal high in Snettisham Power Plant is 44°F and the normal low 35°F, and the chance of measurable rain or snow is 75%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Snettisham Power Plant.
- Jan 30° 22°
- Feb 33° 23°
- Mar 38° 26°
- Apr 48° 32°
- May 58° 38°
- Jun 63° 46°
- Jul 63° 50°
- Aug 63° 49°
- Sep 56° 45°
- Oct 46° 37°
- Nov 36° 29°
- Dec 31° 24°
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 Snettisham Power Plant each month?
July is the warmest month, with normal highs of 63°F; January the coldest, with normal lows of 22°F. The most precipitation falls in October (28.90 in), the least in June (6.85 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 30°F | 22°F | 26.1°F | 18.56 | 21 | <1 | 30 | 7 h 10 min |
| February | 33°F | 23°F | 28.0°F | 14.88 | 17 | <1 | 27 | 9 h 20 min |
| March | 38°F | 26°F | 31.7°F | 10.90 | 16 | <1 | 29 | 11 h 40 min |
| April | 48°F | 32°F | 40.1°F | 8.99 | 18 | <1 | 20 | 14 h 20 min |
| May | 58°F | 38°F | 47.7°F | 8.31 | 15 | <1 | 2 | 16 h 40 min |
| June | 63°F | 46°F | 54.4°F | 6.85 | 18 | <1 | <1 | 18 h 10 min |
| July | 63°F | 50°F | 56.5°F | 10.24 | 19 | <1 | <1 | 17 h 40 min |
| August | 63°F | 49°F | 56.0°F | 13.99 | 20 | <1 | <1 | 15 h 30 min |
| September | 56°F | 45°F | 50.4°F | 27.01 | 22 | <1 | <1 | 13 h |
| October | 46°F | 37°F | 41.7°F | 28.90 | 24 | <1 | 6 | 10 h 30 min |
| November | 36°F | 29°F | 32.4°F | 21.08 | 20 | <1 | 24 | 8 h |
| December | 31°F | 24°F | 27.3°F | 19.98 | 21 | <1 | 30 | 6 h 30 min |
| Year (annual) | 47°F | 35°F | 41.0°F | 189.69 | 231 | <1 | 168 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −1°C | −6°C | −3.3°C | 471 mm |
| February | 1°C | −5°C | −2.2°C | 378 mm |
| March | 3°C | −4°C | −0.2°C | 277 mm |
| April | 9°C | 0°C | 4.5°C | 228 mm |
| May | 14°C | 3°C | 8.7°C | 211 mm |
| June | 17°C | 8°C | 12.4°C | 174 mm |
| July | 17°C | 10°C | 13.6°C | 260 mm |
| August | 17°C | 10°C | 13.3°C | 355 mm |
| September | 13°C | 7°C | 10.2°C | 686 mm |
| October | 8°C | 3°C | 5.4°C | 734 mm |
| November | 2°C | −2°C | 0.2°C | 535 mm |
| December | −1°C | −5°C | −2.6°C | 507 mm |
NOAA publishes no 1991-2020 snowfall normal for this station, and no record within 25 miles keeps one, so snow is left out here rather than estimated.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00508584; 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 Snettisham Power Plant?
No month's normal high reaches 65°F in Snettisham Power Plant: the warmest is July at 63°F.
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 USC00508584.
When is the last frost at Snettisham Power Plant?
In Snettisham Power Plant, the last spring frost (32°F) comes after May 5 in half of years and after May 22 in one year in ten; the first autumn frost comes before October 15 in half of years and before September 30 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
- May 51 year in 10 after May 22; 9 in 10 after April 19
- First autumn frost, half of years before
- October 151 year in 10 before September 30; 9 in 10 before October 31
NOAA puts the median frost-free season at 162 days, and the season without a hard freeze (28°F) at 190 days.
A hard freeze (28°F) comes after April 18 in half of springs and before October 28 in half of autumns.
Frost dates for every NOAA station in Alaska · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00508584. 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 Snettisham Power Plant?
In a normal year in Snettisham Power Plant, a 90°F day is rare, 168 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
- 168a normal year
- Days that stay below freezing
- 59high of 32°F or less
- Days with 0.01 inch of precipitation
- 231a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00508584.
How sunny is it at Snettisham Power Plant?
Over a year 60% of the sunlight that would reach the ground under clear skies gets through the clouds at Snettisham Power Plant, 2.6 kWh per square metre a day. May is the sunniest month (68%) and November the cloudiest (47%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 50% | 0.4 |
| February | 58% | 1.1 |
| March | 62% | 2.4 |
| April | 68% | 4.1 |
| May | 68% | 5.3 |
| June | 60% | 5.1 |
| July | 58% | 4.6 |
| August | 58% | 3.7 |
| September | 56% | 2.4 |
| October | 51% | 1.2 |
| November | 47% | 0.5 |
| December | 50% | 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 Snettisham Power Plant record?
A normal year at Snettisham Power Plant brings 8,731 heating degree days, 62% more than the median U.S. place (5,373), and 5 cooling degree days, 99% fewer than the median (908). Ten months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 636 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,206 | 0 |
| February | 1,035 | 0 |
| March | 1,031 | 0 |
| April | 747 | 0 |
| May | 536 | 0 |
| June | 320 | 2 |
| July | 265 | 2 |
| August | 280 | 1 |
| September | 440 | 0 |
| October | 722 | 0 |
| November | 978 | 0 |
| December | 1,170 | 0 |
| Year (annual) | 8,731 | 5 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00508584. 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 Snettisham Power Plant been warmer than normal?
2025 averaged 40.8°F, 0.2°F below the 1991-2020 normal of 41.0°F. 3 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 39.9°F | −1.1°F | 218.08 |
| 2022 | 41.4°F | +0.4°F | 236.01 |
| 2023 | 42.6°F | +1.6°F | 204.09 |
| 2024 | 41.4°F | +0.4°F | 186.28 |
| 2025 | 40.8°F | −0.2°F | 208.08 |
Source: observed years: ACIS, station USC00508584. A year counts only with all twelve months complete.
How does Snettisham Power Plant's climate compare?
Snettisham Power Plant is warmer than 65 of the 85 places with their own NOAA record in Alaska, and wetter than 73. Across the 7,247 U.S. stations with normals, its annual mean of 41.0°F is warmer than 7%.
In the Köppen classification computed from these normals, Snettisham Power Plant is Dfb: continental, 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 Snettisham Power Plant's climate
What is the coldest month at Snettisham Power Plant?
January, with a normal high of 30°F and a normal low of 22°F. The warmest is July (63°F by day, 50°F at night).
What is the rainiest month at Snettisham Power Plant?
October, with 28.90 in of precipitation in a normal year; the driest is June with 6.85 in.
How late can frost come at Snettisham Power Plant?
In half of years the last 32°F night comes after May 5; in one year in ten it comes after May 22. Waiting until May 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
- Annex Creek, AK18 miles from this station, 39.4°F a year
- Juneau Downtown, AK27 miles from this station, 43.5°F a year
- Eaglecrest Base, AK30 miles from this station, 38.0°F a year
- Juneau, AK34 miles from this station, 42.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made