Clear Sky, Alaska climate: Climate normals at a NOAA weather station
Clear Sky's normal year runs from −17°F January nights to 73°F July afternoons, with 14.1 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of −2.7°C, January lows of −27°C, July highs of 23°C, 359 mm of precipitation a year.
- NOAA stationClear Sky
- Station IDUSC00502015
- Location64.25°N 149.18°W
- Elevation646 ft (197 m)
On October 23, the normal high in Clear Sky is 26°F and the normal low 11°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Clear Sky.
- Jan 1° -17°
- Feb 13° -10°
- Mar 25° -2°
- Apr 45° 18°
- May 62° 35°
- Jun 72° 46°
- Jul 73° 50°
- Aug 66° 45°
- Sep 54° 35°
- Oct 33° 17°
- Nov 11° -6°
- Dec 6° -14°
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 Clear Sky each month?
July is the warmest month, with normal highs of 73°F; January the coldest, with normal lows of −17°F. The most precipitation falls in August (2.94 in), the least in March (0.42 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 1°F | −17°F | -7.9°F | 0.64 | – | <1 | 31 | 5 h 20 min |
| February | 13°F | −10°F | 1.2°F | 0.50 | – | <1 | 28 | 8 h 30 min |
| March | 25°F | −2°F | 11.0°F | 0.42 | – | <1 | 31 | 11 h 30 min |
| April | 45°F | 18°F | 31.8°F | 0.42 | – | <1 | 27 | 15 h |
| May | 62°F | 35°F | 48.4°F | 0.73 | – | <1 | 12 | 18 h 20 min |
| June | 72°F | 46°F | 58.7°F | 1.87 | – | <1 | 1 | 21 h 10 min |
| July | 73°F | 50°F | 61.5°F | 2.62 | – | <1 | <1 | 19 h 50 min |
| August | 66°F | 45°F | 55.5°F | 2.94 | – | <1 | 2 | 16 h 30 min |
| September | 54°F | 35°F | 44.1°F | 1.52 | – | <1 | 13 | 13 h 10 min |
| October | 33°F | 17°F | 24.6°F | 1.03 | – | <1 | 28 | 10 h |
| November | 11°F | −6°F | 2.3°F | 0.86 | – | <1 | 30 | 6 h 40 min |
| December | 6°F | −14°F | -4.2°F | 0.58 | – | <1 | 31 | 4 h 10 min |
| Year (annual) | 38°F | 16°F | 27.2°F | 14.13 | – | <1 | 234 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −17°C | −27°C | −22.2°C | 16 mm |
| February | −11°C | −23°C | −17.1°C | 13 mm |
| March | −4°C | −19°C | −11.7°C | 11 mm |
| April | 7°C | −8°C | −0.1°C | 11 mm |
| May | 16°C | 2°C | 9.1°C | 19 mm |
| June | 22°C | 8°C | 14.8°C | 47 mm |
| July | 23°C | 10°C | 16.4°C | 67 mm |
| August | 19°C | 7°C | 13.1°C | 75 mm |
| September | 12°C | 1°C | 6.7°C | 39 mm |
| October | 0°C | −8°C | −4.1°C | 26 mm |
| November | −12°C | −21°C | −16.5°C | 22 mm |
| December | −15°C | −26°C | −20.1°C | 15 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 USC00502015; 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 Clear Sky?
Normal highs sit between 65°F and 85°F in June, July and August.
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 USC00502015.
When is the last frost at Clear Sky?
In Clear Sky, the last spring frost (32°F) comes after May 24 in half of years and after June 12 in one year in ten; the first autumn frost comes before September 4 in half of years and before August 19 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 241 year in 10 after June 12; 9 in 10 after May 11
- First autumn frost, half of years before
- September 41 year in 10 before August 19; 9 in 10 before September 18
NOAA puts the median frost-free season at 100 days, and the season without a hard freeze (28°F) at 124 days.
A hard freeze (28°F) comes after May 11 in half of springs and before September 15 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Clear Sky in zone 2a in ZIP code 99704, the nearest ZIP area.
Frost dates for every NOAA station in Alaska · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00502015; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Clear Sky?
In a normal year in Clear Sky, a 90°F day is rare and 234 nights fall to 32°F or colder.
- 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
- 234a normal year
- Days that stay below freezing
- 149high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00502015.
How sunny is it at Clear Sky?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds at Clear Sky, 2.6 kWh per square metre a day. March is the sunniest month (85%) and October the cloudiest (61%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 75% | 0.2 |
| February | 76% | 0.9 |
| March | 85% | 2.6 |
| April | 84% | 4.5 |
| May | 75% | 5.3 |
| June | 71% | 5.6 |
| July | 67% | 4.8 |
| August | 68% | 3.7 |
| September | 68% | 2.4 |
| October | 61% | 0.9 |
| November | 63% | 0.3 |
| December | 78% | 0.1 |
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 Clear Sky record?
A normal year at Clear Sky brings 13,762 heating degree days, 2.6 times the median U.S. place (5,373), and 37 cooling degree days, 96% fewer than the median (908). Nine months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 894 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 2,261 | 0 |
| February | 1,787 | 0 |
| March | 1,672 | 0 |
| April | 996 | 0 |
| May | 516 | 0 |
| June | 198 | 11 |
| July | 131 | 23 |
| August | 300 | 3 |
| September | 626 | 0 |
| October | 1,251 | 0 |
| November | 1,879 | 0 |
| December | 2,145 | 0 |
| Year (annual) | 13,762 | 37 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00502015. 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 Clear Sky's climate compare?
Clear Sky is warmer than 20 of the 85 places with their own NOAA record in Alaska, and wetter than 20. Across the 7,247 U.S. stations with normals, its annual mean of 27.2°F is warmer than 1%.
In the Köppen classification computed from these normals, Clear Sky is Dfc: continental, no dry season, cool 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 Clear Sky share this climate record?
Anderson 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.
- Anderson, AK177 people · 4 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 Clear Sky's climate
What is the coldest month at Clear Sky?
January, with a normal high of 1°F and a normal low of −17°F. The warmest is July (73°F by day, 50°F at night).
What is the rainiest month at Clear Sky?
August, with 2.94 in of precipitation in a normal year; the driest is March with 0.42 in.
What plant hardiness zone is Clear Sky in?
The USDA's 2023 map puts Clear Sky in zone 2a in ZIP code 99704, the nearest ZIP area.
How late can frost come at Clear Sky?
In half of years the last 32°F night comes after May 24; in one year in ten it comes after June 12. Waiting until June 12 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Alaska climateThe statewide normals and every place in the state
- Kobe Hill, AK8 miles from this station, 28.2°F a year
- Nenana, AK21 miles from this station, 30.1°F a year
- Healy, AK27 miles from this station, 28.6°F a year
- McKinley Park, AK37 miles from this station, 28.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made