Mazama, Washington climate: Climate normals at a NOAA weather station
Mazama's normal year runs from 16°F December nights to 85°F July afternoons, with 23.1 inches of precipitation and 123 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.4°C, December lows of −9°C, July highs of 29°C, 586 mm of precipitation a year.
- NOAA stationMazama
- Station IDUSC00455133
- Location48.60°N 120.43°W
- Elevation2,141 ft (653 m)
On October 23, the normal high in Mazama is 51°F and the normal low 31°F, and the chance of measurable rain or snow is 37%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Mazama.
- Jan 29° 16°
- Feb 37° 19°
- Mar 46° 26°
- Apr 58° 33°
- May 68° 41°
- Jun 75° 48°
- Jul 85° 55°
- Aug 84° 53°
- Sep 74° 45°
- Oct 57° 34°
- Nov 39° 25°
- Dec 28° 16°
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 Mazama each month?
July is the warmest month, with normal highs of 85°F; December the coldest, with normal lows of 16°F. The most precipitation falls in December (4.05 in), the least in August (0.54 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 29°F | 16°F | 22.5°F | 3.61 | 34.3 | 15 | <1 | 31 | 8 h 40 min |
| February | 37°F | 19°F | 28.0°F | 2.35 | 19.6 | 11 | <1 | 28 | 10 h 10 min |
| March | 46°F | 26°F | 35.9°F | 1.99 | 11.2 | 11 | <1 | 28 | 11 h 50 min |
| April | 58°F | 33°F | 45.0°F | 1.05 | 0.2 | 7 | <1 | 16 | 13 h 40 min |
| May | 68°F | 41°F | 54.8°F | 1.13 | 0.0 | 8 | <1 | 4 | 15 h 10 min |
| June | 75°F | 48°F | 61.5°F | 1.04 | 0.0 | 7 | 2 | <1 | 16 h 10 min |
| July | 85°F | 55°F | 69.6°F | 0.61 | 0.0 | 5 | 10 | <1 | 15 h 50 min |
| August | 84°F | 53°F | 68.7°F | 0.54 | 0.0 | 4 | 9 | <1 | 14 h 30 min |
| September | 74°F | 45°F | 59.4°F | 0.76 | 0.0 | 6 | 2 | 1 | 12 h 40 min |
| October | 57°F | 34°F | 45.0°F | 2.09 | 2.3 | 10 | <1 | 14 | 10 h 50 min |
| November | 39°F | 25°F | 31.7°F | 3.84 | 17.6 | 14 | <1 | 26 | 9 h 20 min |
| December | 28°F | 16°F | 22.3°F | 4.05 | 37.9 | 15 | <1 | 31 | 8 h 20 min |
| Year (annual) | 57°F | 34°F | 45.4°F | 23.06 | 123.1 | 113 | 22 | 180 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −2°C | −9°C | −5.3°C | 92 mm | 87 cm |
| February | 3°C | −7°C | −2.2°C | 60 mm | 50 cm |
| March | 8°C | −3°C | 2.2°C | 51 mm | 28 cm |
| April | 14°C | 0°C | 7.2°C | 27 mm | 1 cm |
| May | 20°C | 5°C | 12.7°C | 29 mm | 0 cm |
| June | 24°C | 9°C | 16.4°C | 26 mm | 0 cm |
| July | 29°C | 13°C | 20.9°C | 15 mm | 0 cm |
| August | 29°C | 12°C | 20.4°C | 14 mm | 0 cm |
| September | 24°C | 7°C | 15.2°C | 19 mm | 0 cm |
| October | 14°C | 1°C | 7.2°C | 53 mm | 6 cm |
| November | 4°C | −4°C | −0.2°C | 98 mm | 45 cm |
| December | −2°C | −9°C | −5.4°C | 103 mm | 96 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00455133; 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 Mazama?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, August has the fewest days with rain (4).
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 USC00455133.
When is the last frost at Mazama?
In Mazama, the last spring frost (32°F) comes after May 9 in half of years and after May 24 in one year in ten; the first autumn frost comes before September 29 in half of years and before September 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
- May 91 year in 10 after May 24; 9 in 10 after April 28
- First autumn frost, half of years before
- September 291 year in 10 before September 15; 9 in 10 before October 10
NOAA puts the median frost-free season at 142 days, and the season without a hard freeze (28°F) at 170 days.
A hard freeze (28°F) comes after April 25 in half of springs and before October 10 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Mazama in zone 6a in ZIP code 98833, 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 6a: the coldest night of a typical year reaches −10°F (28 complete years).
Frost dates for every NOAA station in Washington · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00455133; 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 Mazama?
In a normal year in Mazama, 22 days a year reach 90°F (1 of them 100°F or more), 180 nights fall to 32°F or colder and 113 days bring measurable precipitation.
- Days at 90°F or more
- 22a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 180a normal year
- Days that stay below freezing
- 56high of 32°F or less
- Days with 0.01 inch of precipitation
- 113a normal year
- Days with 1 inch of snow or more
- 31a normal year
The highest temperature in this station's record (since 1965) is 112°F, on June 30, 2021; the lowest is −48°F, on December 30, 1968.
The wettest calendar year on that record is 1995, with 31.99 in; the snowiest season is 1996–97, with 223.9 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00455133; records: ACIS (NOAA Regional Climate Centers), station USC00455133. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Mazama?
Over a year 68% of the sunlight that would reach the ground under clear skies gets through the clouds at Mazama, 3.5 kWh per square metre a day. August is the sunniest month (81%) and December the cloudiest (53%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 55% | 1.1 |
| February | 62% | 2.0 |
| March | 59% | 2.9 |
| April | 63% | 4.3 |
| May | 66% | 5.3 |
| June | 67% | 5.8 |
| July | 81% | 6.7 |
| August | 81% | 5.7 |
| September | 75% | 4.0 |
| October | 64% | 2.3 |
| November | 55% | 1.2 |
| December | 53% | 0.9 |
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 Mazama record?
A normal year at Mazama brings 7,528 heating degree days, 40% more than the median U.S. place (5,373), and 401 cooling degree days, 56% 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 2,072 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,318 | 0 |
| February | 1,037 | 0 |
| March | 902 | 0 |
| April | 599 | 0 |
| May | 324 | 8 |
| June | 145 | 40 |
| July | 29 | 172 |
| August | 36 | 151 |
| September | 198 | 31 |
| October | 619 | 0 |
| November | 999 | 0 |
| December | 1,324 | 0 |
| Year (annual) | 7,528 | 401 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00455133. 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 Mazama been warmer than normal?
2025 averaged 47.6°F, 2.2°F above the 1991-2020 normal of 45.4°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 46.1°F | +0.7°F | 22.15 | – |
| 2022 | 44.1°F | −1.3°F | 22.70 | 157.7 |
| 2023 | 46.6°F | +1.2°F | 19.06 | 65.0 |
| 2024 | 47.1°F | +1.7°F | 21.52 | 115.6 |
| 2025 | 47.6°F | +2.2°F | 26.11 | 49.6 |
Over 43 complete years from 1970 to 2025, the station's annual mean temperature rose at a fitted 7.4°F per century (+0.41°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00455133; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Mazama's climate compare?
Mazama is warmer than 4 of the 96 places with their own NOAA record in Washington, and wetter than 47. Across the 7,247 U.S. stations with normals, its annual mean of 45.4°F is warmer than 21%.
In the Köppen classification computed from these normals, Mazama is Dsb: continental, dry-summer, 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 Mazama's climate
What is the coldest month at Mazama?
December, with a normal high of 28°F and a normal low of 16°F. The warmest is July (85°F by day, 55°F at night).
Does it snow at Mazama?
Yes: 123 inches in a normal year, falling on 50 days with 0.1 inch or more, the most in December (37.9 inches).
What is the rainiest month at Mazama?
December, with 4.05 in of precipitation in a normal year; the driest is August with 0.54 in.
What plant hardiness zone is Mazama in?
The USDA's 2023 map puts Mazama in zone 6a in ZIP code 98833, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −10°F (28 years, 1991-2020): zone 6a.
How late can frost come at Mazama?
In half of years the last 32°F night comes after May 9; in one year in ten it comes after May 24. Waiting until May 24 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Washington climateThe statewide normals and every place in the state
- Winthrop, WA14 miles from this station, 45.7°F a year
- Stehekin (4 mi NW), WA22 miles from this station, 47.8°F a year
- Ross Dam, WA30 miles from this station, 49.1°F a year
- Holden Village, WA32 miles from this station, 40.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made