Klawock, Alaska climate: Normal weather by month, frost dates and records
Klawock's normal year runs from 31°F January nights to 64°F August afternoons, with 89.2 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.3°C, January lows of 0°C, August highs of 18°C, 2,266 mm of precipitation a year.
- NOAA stationKlawock Airport
- Station IDUSW00025367
- Location55.58°N 133.07°W
- Elevation12 ft (4 m)
- Population717
On October 23, the normal high in Klawock is 50°F and the normal low 38°F, and the chance of measurable rain or snow is 77%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Klawock.
- Jan 40° 31°
- Feb 41° 30°
- Mar 44° 31°
- Apr 51° 35°
- May 57° 41°
- Jun 61° 46°
- Jul 63° 51°
- Aug 64° 51°
- Sep 60° 47°
- Oct 52° 40°
- Nov 44° 34°
- Dec 40° 31°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Klawock each month?
August is the warmest month, with normal highs of 64°F; January the coldest, with normal lows of 31°F. The most precipitation falls in October (12.33 in), the least in June (3.41 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 40°F | 31°F | 35.3°F | 8.65 | 22 | <1 | 14 | 7 h 40 min |
| February | 41°F | 30°F | 35.9°F | 6.33 | 18 | <1 | 18 | 9 h 40 min |
| March | 44°F | 31°F | 37.8°F | 6.82 | 21 | <1 | 18 | 11 h 40 min |
| April | 51°F | 35°F | 42.9°F | 5.51 | 20 | <1 | 10 | 14 h 10 min |
| May | 57°F | 41°F | 49.0°F | 4.10 | 18 | <1 | 1 | 16 h 10 min |
| June | 61°F | 46°F | 53.4°F | 3.41 | 18 | <1 | <1 | 17 h 30 min |
| July | 63°F | 51°F | 56.9°F | 4.27 | 19 | <1 | <1 | 17 h |
| August | 64°F | 51°F | 57.5°F | 6.79 | 19 | <1 | <1 | 15 h 10 min |
| September | 60°F | 47°F | 53.3°F | 10.72 | 22 | <1 | <1 | 12 h 50 min |
| October | 52°F | 40°F | 45.7°F | 12.33 | 24 | <1 | 4 | 10 h 30 min |
| November | 44°F | 34°F | 38.9°F | 10.17 | 23 | <1 | 12 | 8 h 20 min |
| December | 40°F | 31°F | 35.7°F | 10.10 | 22 | <1 | 16 | 7 h 10 min |
| Year (annual) | 51°F | 39°F | 45.2°F | 89.20 | 245 | <1 | 94 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 4°C | 0°C | 1.8°C | 220 mm |
| February | 5°C | −1°C | 2.2°C | 161 mm |
| March | 7°C | 0°C | 3.2°C | 173 mm |
| April | 10°C | 2°C | 6.1°C | 140 mm |
| May | 14°C | 5°C | 9.4°C | 104 mm |
| June | 16°C | 8°C | 11.9°C | 87 mm |
| July | 17°C | 10°C | 13.8°C | 108 mm |
| August | 18°C | 10°C | 14.2°C | 172 mm |
| September | 15°C | 8°C | 11.8°C | 272 mm |
| October | 11°C | 4°C | 7.6°C | 313 mm |
| November | 6°C | 1°C | 3.8°C | 258 mm |
| December | 5°C | 0°C | 2.1°C | 257 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 USW00025367; 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.
When is the best weather to visit Klawock?
No month's normal high reaches 65°F in Klawock: the warmest is August at 64°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 USW00025367.
When is the last frost in Klawock?
In Klawock, the last spring frost (32°F) comes after April 29 in half of years and after May 14 in one year in ten; the first autumn frost comes before October 16 in half of years and before October 1 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 291 year in 10 after May 14; 9 in 10 after April 13
- First autumn frost, half of years before
- October 161 year in 10 before October 1; 9 in 10 before November 5
NOAA puts the median frost-free season at 169 days, and the season without a hard freeze (28°F) at 209 days.
A hard freeze (28°F) comes after April 9 in half of springs and before November 5 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Klawock in zone 7b in ZIP code 99925, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Klawock's NOAA station is in zone 8a: the coldest night of a typical year reaches 12°F (19 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Alaska · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00025367; 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 in Klawock?
In a normal year in Klawock, a 90°F day is rare, 94 nights fall to 32°F or colder and 245 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
- 94a normal year
- Days that stay below freezing
- 13high of 32°F or less
- Days with 0.01 inch of precipitation
- 245a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USW00025367.
How sunny is Klawock?
Over a year 57% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Klawock, 2.5 kWh per square metre a day. May is the sunniest month (61%) and January the cloudiest (46%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 46% | 0.5 |
| February | 56% | 1.2 |
| March | 56% | 2.3 |
| April | 60% | 3.6 |
| May | 61% | 4.6 |
| June | 57% | 4.6 |
| July | 55% | 4.2 |
| August | 59% | 3.7 |
| September | 56% | 2.5 |
| October | 52% | 1.4 |
| November | 48% | 0.6 |
| December | 47% | 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 much heating and cooling does Klawock need?
A normal year in Klawock brings 7,216 heating degree days, 34% more than the median U.S. place (5,373), and 6 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 728 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 921 | 0 |
| February | 816 | 0 |
| March | 842 | 0 |
| April | 662 | 0 |
| May | 498 | 0 |
| June | 348 | 1 |
| July | 256 | 4 |
| August | 235 | 1 |
| September | 351 | 0 |
| October | 598 | 0 |
| November | 783 | 0 |
| December | 907 | 0 |
| Year (annual) | 7,216 | 6 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00025367. 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.
How does Klawock's climate compare?
Klawock is warmer than 80 of the other 84 places with their own NOAA record in Alaska, and wetter than 63. Across the 7,247 U.S. stations with normals, its annual mean of 45.2°F is warmer than 20%.
In the Köppen classification computed from these normals, Klawock 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.
Which places near Klawock share this climate record?
Naukati Bay has no NOAA station with 1991-2020 normals of its own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Naukati Bay, AK97 people · 21 mi N
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Klawock's climate
What is the coldest month in Klawock?
January, with a normal high of 40°F and a normal low of 31°F. The warmest is August (64°F by day, 51°F at night).
What is the rainiest month in Klawock?
October, with 12.33 in of precipitation in a normal year; the driest is June with 3.41 in.
What plant hardiness zone is Klawock in?
The USDA's 2023 map puts Klawock in zone 7b in ZIP code 99925, the nearest ZIP area. By the same method at Klawock's NOAA station, the coldest night of a typical year reaches 12°F (19 years, 1991-2020): zone 8a.
How late can frost come in Klawock?
In half of years the last 32°F night comes after April 29; in one year in ten it comes after May 14. Waiting until May 14 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Alaska climateThe statewide normals and every place in the state
- Craig, AK7 miles from this station, 44.9°F a year
- Thorne Bay, AK23 miles from this station, 44.2°F a year
- Ketchikan, AK55 miles from this station, 46.0°F a year
- Point Baker, AK57 miles from this station, 43.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made