Jess Valley, California climate: Climate normals at a NOAA weather station
Jess Valley's normal year runs from 20°F December nights to 84°F July afternoons, with 18.9 inches of precipitation and 82 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.8°C, December lows of −7°C, July highs of 29°C, 479 mm of precipitation a year.
- NOAA stationJess Valley
- Station IDUSC00044374
- Location41.27°N 120.29°W
- Elevation5,400 ft (1,646 m)
On October 24, the normal high in Jess Valley is 61°F and the normal low 29°F, and the chance of measurable rain or snow is 19%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Jess Valley.
- Jan 43° 21°
- Feb 45° 21°
- Mar 50° 24°
- Apr 55° 27°
- May 64° 34°
- Jun 74° 40°
- Jul 84° 47°
- Aug 84° 46°
- Sep 77° 39°
- Oct 65° 31°
- Nov 51° 25°
- Dec 42° 20°
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 Jess Valley each month?
July is the warmest month, with normal highs of 84°F; December the coldest, with normal lows of 20°F. The most precipitation falls in May (2.77 in), the least in August (0.38 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 43°F | 21°F | 31.7°F | 1.93 | 12.5 | 9 | <1 | 29 | 9 h 30 min |
| February | 45°F | 21°F | 33.0°F | 1.56 | 8.7 | 9 | <1 | 26 | 10 h 40 min |
| March | 50°F | 24°F | 36.6°F | 1.85 | 14.5 | 10 | <1 | 27 | 11 h 50 min |
| April | 55°F | 27°F | 41.1°F | 2.38 | 14.4 | 10 | <1 | 23 | 13 h 20 min |
| May | 64°F | 34°F | 49.2°F | 2.77 | 4.2 | 8 | <1 | 12 | 14 h 30 min |
| June | 74°F | 40°F | 56.6°F | 1.53 | 0.4 | 5 | 1 | 4 | 15 h 10 min |
| July | 84°F | 47°F | 65.3°F | 0.43 | 0.0 | 2 | 7 | <1 | 14 h 50 min |
| August | 84°F | 46°F | 64.6°F | 0.38 | 0.0 | 2 | 5 | <1 | 13 h 50 min |
| September | 77°F | 39°F | 58.3°F | 0.58 | 0.1 | 3 | 2 | 4 | 12 h 30 min |
| October | 65°F | 31°F | 47.7°F | 1.15 | 2.9 | 5 | <1 | 16 | 11 h 10 min |
| November | 51°F | 25°F | 38.1°F | 1.90 | 8.1 | 8 | <1 | 25 | 9 h 50 min |
| December | 42°F | 20°F | 30.7°F | 2.41 | 16.2 | 9 | <1 | 28 | 9 h 10 min |
| Year (annual) | 61°F | 31°F | 46.1°F | 18.87 | 82.0 | 79 | 15 | 195 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 6°C | −6°C | −0.2°C | 49 mm | 32 cm |
| February | 7°C | −6°C | 0.6°C | 40 mm | 22 cm |
| March | 10°C | −5°C | 2.6°C | 47 mm | 37 cm |
| April | 13°C | −3°C | 5.1°C | 60 mm | 37 cm |
| May | 18°C | 1°C | 9.6°C | 70 mm | 11 cm |
| June | 23°C | 4°C | 13.7°C | 39 mm | 1 cm |
| July | 29°C | 8°C | 18.5°C | 11 mm | 0 cm |
| August | 29°C | 8°C | 18.1°C | 10 mm | 0 cm |
| September | 25°C | 4°C | 14.6°C | 15 mm | 0 cm |
| October | 18°C | −1°C | 8.7°C | 29 mm | 7 cm |
| November | 11°C | −4°C | 3.4°C | 48 mm | 21 cm |
| December | 6°C | −7°C | −0.7°C | 61 mm | 41 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00044374; 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 Jess Valley?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, July has the fewest days with rain (2).
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 USC00044374.
When is the last frost at Jess Valley?
In Jess Valley, the last spring frost (32°F) comes after June 14 in half of years and after July 3 in one year in ten; the first autumn frost comes before September 18 in half of years and before August 31 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
- June 141 year in 10 after July 3; 9 in 10 after May 26
- First autumn frost, half of years before
- September 181 year in 10 before August 31; 9 in 10 before October 3
NOAA puts the median frost-free season at 94 days, and the season without a hard freeze (28°F) at 124 days.
A hard freeze (28°F) comes after May 30 in half of springs and before October 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Jess Valley in zone 6b in ZIP code 96116, 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 USC00044374; 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 Jess Valley?
In a normal year in Jess Valley, 15 days a year reach 90°F, 195 nights fall to 32°F or colder and 79 days bring measurable precipitation.
- Days at 90°F or more
- 15a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 195a normal year
- Days that stay below freezing
- 14high of 32°F or less
- Days with 0.01 inch of precipitation
- 79a normal year
- Days with 1 inch of snow or more
- 30a normal year
The highest temperature in this station's record (since 1948) is 105°F, on August 5, 1972; the lowest is −33°F, on January 22, 1962.
The wettest calendar year on that record is 1964, with 23.91 in; the snowiest season is 1983–84, with 115.1 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00044374; records: ACIS (NOAA Regional Climate Centers), station USC00044374. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Jess Valley?
Over a year 82% of the sunlight that would reach the ground under clear skies gets through the clouds at Jess Valley, 4.8 kWh per square metre a day. July is the sunniest month (93%) and December the cloudiest (64%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 69% | 2.0 |
| February | 71% | 3.0 |
| March | 70% | 4.1 |
| April | 74% | 5.5 |
| May | 80% | 6.8 |
| June | 88% | 7.9 |
| July | 93% | 8.0 |
| August | 93% | 7.1 |
| September | 90% | 5.6 |
| October | 83% | 3.8 |
| November | 71% | 2.3 |
| December | 64% | 1.6 |
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 Jess Valley record?
A normal year at Jess Valley brings 7,019 heating degree days, 31% more than the median U.S. place (5,373), and 147 cooling degree days, 84% 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 1,591 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,032 | 0 |
| February | 896 | 0 |
| March | 879 | 0 |
| April | 717 | 0 |
| May | 489 | 1 |
| June | 259 | 9 |
| July | 64 | 74 |
| August | 67 | 53 |
| September | 211 | 10 |
| October | 535 | 1 |
| November | 807 | 0 |
| December | 1,062 | 0 |
| Year (annual) | 7,019 | 147 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00044374. 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 Jess Valley's climate compare?
Jess Valley is warmer than 5 of the 219 places with their own NOAA record in California, and wetter than 127. Across the 7,247 U.S. stations with normals, its annual mean of 46.1°F is warmer than 24%.
In the Köppen classification computed from these normals, Jess Valley 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.
Which places near Jess Valley share this climate record?
3 places have no NOAA station with 1991-2020 normals of their 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.
- Eagleville, CA40 people · 10 mi E
- Madeline, CA28 people · 18 mi SW
- Likely, CA0 people · 11 mi W
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 Jess Valley's climate
What is the coldest month at Jess Valley?
December, with a normal high of 42°F and a normal low of 20°F. The warmest is July (84°F by day, 47°F at night).
Does it snow at Jess Valley?
Yes: 82 inches in a normal year, falling on 32 days with 0.1 inch or more, the most in December (16.2 inches).
What is the rainiest month at Jess Valley?
May, with 2.77 in of precipitation in a normal year; the driest is August with 0.38 in.
What plant hardiness zone is Jess Valley in?
The USDA's 2023 map puts Jess Valley in zone 6b in ZIP code 96116, the nearest ZIP area.
How late can frost come at Jess Valley?
In half of years the last 32°F night comes after June 14; in one year in ten it comes after July 3. Waiting until July 3 leaves about a one-in-ten chance of a later frost.
Nearby and next
- California climateThe statewide normals and every place in the state
- Cedarville, CA19 miles from this station, 50.1°F a year
- Alturas, CA21 miles from this station, 47.6°F a year
- Canby, CA33 miles from this station, 47.7°F a year
- Adin, CA34 miles from this station, 50.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made