Johnson Valley, California climate: Climate normals at a NOAA weather station
Johnson Valley's normal year runs from 35°F December nights to 97°F July afternoons, with 5.6 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 17.4°C, December lows of 2°C, July highs of 36°C, 141 mm of precipitation a year.
- NOAA stationJohnson Valley
- Station IDUSC00044394
- Location34.36°N 116.54°W
- Elevation3,167 ft (965 m)
On October 23, the normal high in Johnson Valley is 76°F and the normal low 50°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Johnson Valley.
- Jan 57° 38°
- Feb 60° 39°
- Mar 67° 42°
- Apr 74° 47°
- May 82° 54°
- Jun 92° 63°
- Jul 97° 69°
- Aug 97° 69°
- Sep 90° 62°
- Oct 78° 52°
- Nov 65° 42°
- Dec 55° 35°
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 Johnson Valley each month?
July is the warmest month, with normal highs of 97°F; December the coldest, with normal lows of 35°F. The most precipitation falls in January (1.36 in), the least in June (0.03 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 57°F | 38°F | 47.3°F | 1.36 | – | <1 | 6 | 10 h 10 min |
| February | 60°F | 39°F | 49.0°F | 1.28 | – | <1 | 7 | 11 h |
| March | 67°F | 42°F | 54.2°F | 0.51 | – | <1 | 2 | 11 h 50 min |
| April | 74°F | 47°F | 60.4°F | 0.30 | – | 1 | <1 | 13 h |
| May | 82°F | 54°F | 68.2°F | 0.16 | – | 7 | <1 | 14 h |
| June | 92°F | 63°F | 77.5°F | 0.03 | – | 23 | <1 | 14 h 30 min |
| July | 97°F | 69°F | 83.2°F | 0.30 | – | 30 | <1 | 14 h 20 min |
| August | 97°F | 69°F | 82.7°F | 0.27 | – | 29 | <1 | 13 h 30 min |
| September | 90°F | 62°F | 75.7°F | 0.24 | – | 19 | <1 | 12 h 30 min |
| October | 78°F | 52°F | 65.1°F | 0.38 | – | 2 | <1 | 11 h 20 min |
| November | 65°F | 42°F | 53.3°F | 0.24 | – | <1 | 2 | 10 h 20 min |
| December | 55°F | 35°F | 44.8°F | 0.49 | – | <1 | 11 | 9 h 50 min |
| Year (annual) | 76°F | 51°F | 63.4°F | 5.56 | – | 110 | 28 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 14°C | 3°C | 8.5°C | 35 mm |
| February | 15°C | 4°C | 9.4°C | 33 mm |
| March | 19°C | 6°C | 12.3°C | 13 mm |
| April | 23°C | 8°C | 15.8°C | 8 mm |
| May | 28°C | 12°C | 20.1°C | 4 mm |
| June | 34°C | 17°C | 25.3°C | 1 mm |
| July | 36°C | 21°C | 28.4°C | 8 mm |
| August | 36°C | 20°C | 28.2°C | 7 mm |
| September | 32°C | 17°C | 24.3°C | 6 mm |
| October | 26°C | 11°C | 18.4°C | 10 mm |
| November | 18°C | 5°C | 11.8°C | 6 mm |
| December | 13°C | 2°C | 7.1°C | 12 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Yucca Valley (18 miles away), gets 2 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00044394; 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 Johnson Valley?
Normal highs sit between 65°F and 85°F in March, April, May and October.
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 USC00044394.
When is the last frost at Johnson Valley?
In Johnson Valley, the last spring frost (32°F) comes after March 1 in half of years and after March 29 in one year in ten; the first autumn frost comes before November 29 in half of years and before November 11 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 11 year in 10 after March 29; 9 in 10 after January 24
- First autumn frost, half of years before
- November 291 year in 10 before November 11; 9 in 10 before December 14
NOAA puts the median frost-free season at 271 days, and the season without a hard freeze (28°F) at 318 days.
A hard freeze (28°F) comes after January 30 in half of springs and before December 10 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Johnson Valley in zone 9a in ZIP code 92285, the nearest ZIP area.
Frost dates for every NOAA station in California · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00044394; 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 Johnson Valley?
In a normal year in Johnson Valley, 110 days a year reach 90°F (31 of them 100°F or more) and 28 nights fall to 32°F or colder.
- Days at 90°F or more
- 110a normal year
- Days at 100°F or more
- 31a normal year
- Nights at 32°F or colder
- 28a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00044394.
How sunny is it at Johnson Valley?
Over a year 93% of the sunlight that would reach the ground under clear skies gets through the clouds at Johnson Valley, 5.9 kWh per square metre a day. June is the sunniest month (97%) and December the cloudiest (86%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 87% | 3.4 |
| February | 87% | 4.4 |
| March | 90% | 5.8 |
| April | 93% | 7.2 |
| May | 95% | 8.1 |
| June | 97% | 8.6 |
| July | 93% | 7.8 |
| August | 94% | 7.3 |
| September | 95% | 6.3 |
| October | 94% | 5.0 |
| November | 91% | 3.7 |
| December | 86% | 3.0 |
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 Johnson Valley record?
A normal year at Johnson Valley brings 2,643 heating degree days, 51% fewer than the median U.S. place (5,373), and 2,107 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 5,445 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 547 | 0 |
| February | 447 | 0 |
| March | 336 | 3 |
| April | 171 | 32 |
| May | 56 | 155 |
| June | 4 | 378 |
| July | 0 | 566 |
| August | 0 | 549 |
| September | 9 | 328 |
| October | 89 | 92 |
| November | 358 | 6 |
| December | 626 | 0 |
| Year (annual) | 2,643 | 2,107 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00044394. 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 Johnson Valley's climate compare?
Johnson Valley is warmer than 158 of the 219 places with their own NOAA record in California, and wetter than 16. Across the 7,247 U.S. stations with normals, its annual mean of 63.4°F is warmer than 84%.
In the Köppen classification computed from these normals, Johnson Valley is BWk: cold desert. 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 Johnson Valley's climate
What is the coldest month at Johnson Valley?
December, with a normal high of 55°F and a normal low of 35°F. The warmest is July (97°F by day, 69°F at night).
Does it snow at Johnson Valley?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Yucca Valley (18 miles away), records 2 inches of snow in a normal year.
What is the rainiest month at Johnson Valley?
January, with 1.36 in of precipitation in a normal year; the driest is June with 0.03 in.
What plant hardiness zone is Johnson Valley in?
The USDA's 2023 map puts Johnson Valley in zone 9a in ZIP code 92285, the nearest ZIP area.
How late can frost come at Johnson Valley?
In half of years the last 32°F night comes after March 1; in one year in ten it comes after March 29. Waiting until March 29 leaves about a one-in-ten chance of a later frost.
Nearby and next
- California climateThe statewide normals and every place in the state
- Yucca Mesa, CA12 miles from this station, 64.9°F a year
- Yucca Valley, CA18 miles from this station, 62.9°F a year
- Morongo Valley, CA19 miles from this station, 64.5°F a year
- Joshua Tree, CA21 miles from this station, 65.5°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made