Ash Mountain, California climate: Climate normals at a NOAA weather station
Ash Mountain's normal year runs from 38°F December nights to 97°F July afternoons, with 25.0 inches of precipitation and less than an inch of snow (0.2 in) a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 17.5°C, December lows of 3°C, July highs of 36°C, 635 mm of precipitation a year.
- NOAA stationAsh Mountain
- Station IDUSC00040343
- Location36.49°N 118.83°W
- Elevation1,708 ft (521 m)
On October 23, the normal high in Ash Mountain is 76°F and the normal low 51°F, and the chance of measurable rain or snow is 13%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Ash Mountain.
- Jan 58° 38°
- Feb 60° 41°
- Mar 64° 43°
- Apr 69° 45°
- May 79° 54°
- Jun 90° 62°
- Jul 97° 69°
- Aug 97° 68°
- Sep 91° 63°
- Oct 79° 53°
- Nov 66° 44°
- Dec 57° 38°
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 Ash Mountain each month?
July is the warmest month, with normal highs of 97°F; December the coldest, with normal lows of 38°F. The most precipitation falls in January (4.89 in), the least in August (0.02 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 58°F | 38°F | 47.9°F | 4.89 | 9 | <1 | 6 | 10 h |
| February | 60°F | 41°F | 50.4°F | 4.29 | 11 | <1 | 4 | 10 h 50 min |
| March | 64°F | 43°F | 53.5°F | 4.02 | 10 | <1 | 2 | 11 h 50 min |
| April | 69°F | 45°F | 57.2°F | 2.48 | 7 | 1 | 1 | 13 h 10 min |
| May | 79°F | 54°F | 66.3°F | 1.23 | 5 | 6 | <1 | 14 h |
| June | 90°F | 62°F | 75.9°F | 0.37 | 1 | 19 | <1 | 14 h 40 min |
| July | 97°F | 69°F | 83.0°F | 0.14 | 1 | 29 | <1 | 14 h 30 min |
| August | 97°F | 68°F | 82.3°F | 0.02 | <1 | 29 | <1 | 13 h 40 min |
| September | 91°F | 63°F | 76.9°F | 0.18 | 2 | 21 | <1 | 12 h 30 min |
| October | 79°F | 53°F | 66.2°F | 1.24 | 4 | 6 | <1 | 11 h 20 min |
| November | 66°F | 44°F | 54.7°F | 2.41 | 6 | <1 | 2 | 10 h 20 min |
| December | 57°F | 38°F | 47.4°F | 3.72 | 8 | <1 | 7 | 9 h 40 min |
| Year (annual) | 76°F | 52°F | 63.5°F | 24.99 | 63 | 112 | 23 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 14°C | 3°C | 8.8°C | 124 mm |
| February | 16°C | 5°C | 10.2°C | 109 mm |
| March | 18°C | 6°C | 11.9°C | 102 mm |
| April | 21°C | 7°C | 14.0°C | 63 mm |
| May | 26°C | 12°C | 19.1°C | 31 mm |
| June | 32°C | 17°C | 24.4°C | 9 mm |
| July | 36°C | 21°C | 28.3°C | 4 mm |
| August | 36°C | 20°C | 27.9°C | 1 mm |
| September | 33°C | 17°C | 24.9°C | 5 mm |
| October | 26°C | 12°C | 19.0°C | 31 mm |
| November | 19°C | 7°C | 12.6°C | 61 mm |
| December | 14°C | 3°C | 8.6°C | 94 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00040343; 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 Ash Mountain?
Normal highs sit between 65°F and 85°F in April, May, October and November. Of those, October 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 USC00040343.
When is the last frost at Ash Mountain?
In Ash Mountain, the last spring frost (32°F) comes after March 12 in half of years and after April 16 in one year in ten; the first autumn frost comes before December 9 in half of years and before November 17 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
- March 121 year in 10 after April 16; 9 in 10 after January 20
- First autumn frost, half of years before
- December 91 year in 10 before November 17; 9 in 10 before January 2
NOAA puts the median frost-free season at 273 days, and the season without a hard freeze (28°F) at 343 days.
A hard freeze (28°F) comes after January 15 in half of springs and before December 23 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Ash Mountain in zone 9b in ZIP code 93271, 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 9b: the coldest night of a typical year reaches 25°F (17 complete years).
Frost dates for every NOAA station in California · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00040343; 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 Ash Mountain?
In a normal year in Ash Mountain, 112 days a year reach 90°F (42 of them 100°F or more), 23 nights fall to 32°F or colder and 63 days bring measurable precipitation.
- Days at 90°F or more
- 112a normal year
- Days at 100°F or more
- 42a normal year
- Nights at 32°F or colder
- 23a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 63a normal year
The highest temperature in this station's record (since 1927) is 118°F, on July 6, 2007; the lowest is 17°F, on December 23, 1990.
The wettest calendar year on that record is 1982, with 51.05 in; the snowiest season is 1975–76, with 12.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00040343; records: ACIS (NOAA Regional Climate Centers), station USC00040343. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Ash Mountain?
Over a year 85% of the sunlight that would reach the ground under clear skies gets through the clouds at Ash Mountain, 5.4 kWh per square metre a day. August is the sunniest month (93%) and February the cloudiest (74%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 76% | 2.8 |
| February | 74% | 3.6 |
| March | 76% | 4.9 |
| April | 78% | 6.1 |
| May | 83% | 7.2 |
| June | 92% | 8.4 |
| July | 91% | 7.9 |
| August | 93% | 7.4 |
| September | 92% | 6.2 |
| October | 88% | 4.6 |
| November | 82% | 3.3 |
| December | 74% | 2.5 |
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 Ash Mountain record?
A normal year at Ash Mountain brings 2,606 heating degree days, 51% fewer than the median U.S. place (5,373), and 2,083 cooling degree days, 2.3 times the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 5,360 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 529 | 0 |
| February | 408 | 0 |
| March | 359 | 2 |
| April | 253 | 18 |
| May | 94 | 133 |
| June | 13 | 341 |
| July | 0 | 560 |
| August | 0 | 538 |
| September | 6 | 362 |
| October | 82 | 121 |
| November | 317 | 9 |
| December | 545 | 0 |
| Year (annual) | 2,606 | 2,083 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00040343. 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 Ash Mountain been warmer than normal?
Over 72 complete years from 1928 to 2019, the station's annual mean temperature rose at a fitted 1.6°F per century (+0.09°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Ash Mountain's climate compare?
Ash Mountain is warmer than 161 of the 219 places with their own NOAA record in California, and wetter than 157. Across the 7,247 U.S. stations with normals, its annual mean of 63.5°F is warmer than 84%.
In the Köppen classification computed from these normals, Ash Mountain is Csa: temperate, dry-summer, hot 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 Ash Mountain share this climate record?
Silver City 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.
- Silver City, CA0 people · 10 mi E
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 Ash Mountain's climate
What is the coldest month at Ash Mountain?
December, with a normal high of 57°F and a normal low of 38°F. The warmest is July (97°F by day, 69°F at night).
Does it snow at Ash Mountain?
Rarely: NOAA's normal is 0.2 inch a year.
What is the rainiest month at Ash Mountain?
January, with 4.89 in of precipitation in a normal year; the driest is August with 0.02 in.
What plant hardiness zone is Ash Mountain in?
The USDA's 2023 map puts Ash Mountain in zone 9b in ZIP code 93271, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 25°F (17 years, 1991-2020): zone 9b.
How late can frost come at Ash Mountain?
In half of years the last 32°F night comes after March 12; in one year in ten it comes after April 16. Waiting until April 16 leaves about a one-in-ten chance of a later frost.
Nearby and next
- California climateThe statewide normals and every place in the state
- Three Rivers, CA2 miles from this station, 62.5°F a year
- Lodgepole, CA9 miles from this station, 42.7°F a year
- Lemon Cove, CA14 miles from this station, 65.0°F a year
- Grant Grove, CA19 miles from this station, 48.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made