Cooper Lake Project, Alaska climate: Climate normals at a NOAA weather station
Cooper Lake Project's normal year runs from 15°F January nights to 65°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 3.6°C, January lows of −9°C, July highs of 18°C.
- NOAA stationCooper Lake Project
- Station IDUSC00502144
- Location60.39°N 149.67°W
- Elevation505 ft (154 m)
On October 23, the normal high in Cooper Lake Project is 43°F and the normal low 29°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Cooper Lake Project.
- Jan 28° 15°
- Feb 32° 17°
- Mar 36° 19°
- Apr 46° 27°
- May 55° 35°
- Jun 63° 43°
- Jul 65° 48°
- Aug 65° 47°
- Sep 55° 40°
- Oct 45° 31°
- Nov 36° 23°
- Dec 32° 19°
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 Cooper Lake Project each month?
July is the warmest month, with normal highs of 65°F; January the coldest, with normal lows of 15°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 28°F | 15°F | 21.3°F | – | <1 | 28 | 6 h 30 min |
| February | 32°F | 17°F | 24.8°F | – | <1 | 25 | 9 h |
| March | 36°F | 19°F | 27.3°F | – | <1 | 27 | 11 h 40 min |
| April | 46°F | 27°F | 36.6°F | – | <1 | 20 | 14 h 30 min |
| May | 55°F | 35°F | 45.0°F | – | <1 | 8 | 17 h 10 min |
| June | 63°F | 43°F | 52.8°F | – | <1 | <1 | 19 h |
| July | 65°F | 48°F | 56.2°F | – | <1 | <1 | 18 h 20 min |
| August | 65°F | 47°F | 55.8°F | – | <1 | <1 | 15 h 50 min |
| September | 55°F | 40°F | 47.5°F | – | <1 | 4 | 13 h |
| October | 45°F | 31°F | 38.4°F | – | <1 | 19 | 10 h 20 min |
| November | 36°F | 23°F | 29.5°F | – | <1 | 25 | 7 h 30 min |
| December | 32°F | 19°F | 25.4°F | – | <1 | 29 | 5 h 50 min |
| Year (annual) | 46°F | 30°F | 38.4°F | – | <1 | 186 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | −2°C | −9°C | −5.9°C |
| February | 0°C | −8°C | −4.0°C |
| March | 2°C | −7°C | −2.6°C |
| April | 8°C | −3°C | 2.6°C |
| May | 13°C | 2°C | 7.2°C |
| June | 17°C | 6°C | 11.6°C |
| July | 18°C | 9°C | 13.4°C |
| August | 18°C | 8°C | 13.2°C |
| September | 13°C | 4°C | 8.6°C |
| October | 7°C | 0°C | 3.6°C |
| November | 2°C | −5°C | −1.4°C |
| December | 0°C | −7°C | −3.7°C |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Seward (19 mi N) (11 miles away), gets 90 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00502144; 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 Cooper Lake Project?
No month's normal high reaches 65°F in Cooper Lake Project: the warmest is July at 65°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 USC00502144.
When is the last frost at Cooper Lake Project?
In Cooper Lake Project, the last spring frost (32°F) comes after May 18 in half of years and after May 31 in one year in ten; the first autumn frost comes before September 27 in half of years and before September 12 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 181 year in 10 after May 31; 9 in 10 after May 6
- First autumn frost, half of years before
- September 271 year in 10 before September 12; 9 in 10 before October 14
NOAA puts the median frost-free season at 130 days, and the season without a hard freeze (28°F) at 158 days.
A hard freeze (28°F) comes after May 4 in half of springs and before October 10 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Cooper Lake Project in zone 5a in ZIP code 99631, 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 USC00502144; 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 Cooper Lake Project?
In a normal year in Cooper Lake Project, a 90°F day is rare and 186 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
- 186a normal year
- Days that stay below freezing
- 60high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00502144.
How sunny is it at Cooper Lake Project?
Over a year 59% of the sunlight that would reach the ground under clear skies gets through the clouds at Cooper Lake Project, 2.4 kWh per square metre a day. March is the sunniest month (64%) and November the cloudiest (52%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 53% | 0.3 |
| February | 55% | 0.9 |
| March | 64% | 2.3 |
| April | 61% | 3.6 |
| May | 61% | 4.6 |
| June | 59% | 4.9 |
| July | 60% | 4.6 |
| August | 58% | 3.5 |
| September | 57% | 2.3 |
| October | 53% | 1.1 |
| November | 52% | 0.4 |
| December | 53% | 0.2 |
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 Cooper Lake Project record?
A normal year at Cooper Lake Project brings 9,689 heating degree days, 80% more than the median U.S. place (5,373), and 2 cooling degree days, 100% 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 521 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,355 | 0 |
| February | 1,126 | 0 |
| March | 1,169 | 0 |
| April | 854 | 0 |
| May | 618 | 0 |
| June | 368 | 0 |
| July | 273 | 1 |
| August | 286 | 0 |
| September | 525 | 0 |
| October | 825 | 0 |
| November | 1,064 | 0 |
| December | 1,229 | 0 |
| Year (annual) | 9,689 | 2 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00502144. 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 Cooper Lake Project's climate compare?
Cooper Lake Project is warmer than 56 of the 85 places with their own NOAA record in Alaska. Across the 7,247 U.S. stations with normals, its annual mean of 38.4°F is warmer than 4%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Questions about Cooper Lake Project's climate
What is the coldest month at Cooper Lake Project?
January, with a normal high of 28°F and a normal low of 15°F. The warmest is July (65°F by day, 48°F at night).
Does it snow at Cooper Lake Project?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Seward (19 mi N) (11 miles away), records 90 inches of snow in a normal year.
What plant hardiness zone is Cooper Lake Project in?
The USDA's 2023 map puts Cooper Lake Project in zone 5a in ZIP code 99631, the nearest ZIP area.
How late can frost come at Cooper Lake Project?
In half of years the last 32°F night comes after May 18; in one year in ten it comes after May 31. Waiting until May 31 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Alaska climateThe statewide normals and every place in the state
- Moose Pass, AK11 miles from this station, 35.7°F a year
- Cooper Landing, AK12 miles from this station, 36.7°F a year
- Seward, AK20 miles from this station, 40.4°F a year
- Hope, AK35 miles from this station, 36.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made