East Park Reservoir, California climate: Climate normals at a NOAA weather station
East Park Reservoir's normal year runs from 32°F January nights to 94°F July afternoons, with 21.8 inches of precipitation and 1 inch of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 15.2°C, January lows of 0°C, July highs of 35°C, 553 mm of precipitation a year.
- NOAA stationEast Park Reservoir
- Station IDUSC00042640
- Location39.36°N 122.52°W
- Elevation1,205 ft (367 m)
On October 24, the normal high in East Park Reservoir is 75°F and the normal low 43°F, and the chance of measurable rain or snow is 11%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for East Park Reservoir.
- Jan 57° 32°
- Feb 59° 35°
- Mar 63° 38°
- Apr 69° 41°
- May 78° 48°
- Jun 88° 54°
- Jul 94° 60°
- Aug 93° 57°
- Sep 89° 52°
- Oct 79° 45°
- Nov 65° 37°
- Dec 57° 32°
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 East Park Reservoir each month?
July is the warmest month, with normal highs of 94°F; January the coldest, with normal lows of 32°F. The most precipitation falls in January (4.98 in), the least in July (0.02 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 57°F | 32°F | 44.4°F | 4.98 | 0.7 | 12 | <1 | 16 | 9 h 40 min |
| February | 59°F | 35°F | 47.0°F | 4.49 | 0.7 | 10 | <1 | 10 | 10 h 40 min |
| March | 63°F | 38°F | 50.7°F | 2.84 | 0.0 | 8 | <1 | 7 | 11 h 50 min |
| April | 69°F | 41°F | 55.2°F | 1.18 | 0.0 | 4 | <1 | 3 | 13 h 10 min |
| May | 78°F | 48°F | 63.0°F | 0.93 | 0.0 | 4 | 5 | <1 | 14 h 20 min |
| June | 88°F | 54°F | 70.9°F | 0.33 | 0.0 | 2 | 11 | <1 | 15 h |
| July | 94°F | 60°F | 77.0°F | 0.02 | 0.0 | <1 | 23 | <1 | 14 h 40 min |
| August | 93°F | 57°F | 75.1°F | 0.05 | 0.0 | 1 | 22 | <1 | 13 h 50 min |
| September | 89°F | 52°F | 70.7°F | 0.15 | 0.0 | 1 | 16 | <1 | 12 h 30 min |
| October | 79°F | 45°F | 62.1°F | 0.87 | 0.0 | 2 | 5 | 1 | 11 h 10 min |
| November | 65°F | 37°F | 50.9°F | 2.13 | 0.0 | 7 | <1 | 7 | 10 h |
| December | 57°F | 32°F | 44.6°F | 3.79 | 0.0 | 9 | <1 | 17 | 9 h 30 min |
| Year (annual) | 74°F | 44°F | 59.3°F | 21.76 | 1.4 | 58 | 81 | 60 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 14°C | 0°C | 6.9°C | 126 mm | 2 cm |
| February | 15°C | 1°C | 8.3°C | 114 mm | 2 cm |
| March | 17°C | 3°C | 10.4°C | 72 mm | 0 cm |
| April | 21°C | 5°C | 12.9°C | 30 mm | 0 cm |
| May | 26°C | 9°C | 17.2°C | 24 mm | 0 cm |
| June | 31°C | 12°C | 21.6°C | 8 mm | 0 cm |
| July | 35°C | 15°C | 25.0°C | 1 mm | 0 cm |
| August | 34°C | 14°C | 23.9°C | 1 mm | 0 cm |
| September | 32°C | 11°C | 21.5°C | 4 mm | 0 cm |
| October | 26°C | 7°C | 16.7°C | 22 mm | 0 cm |
| November | 18°C | 3°C | 10.5°C | 54 mm | 0 cm |
| December | 14°C | 0°C | 7.0°C | 96 mm | 0 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00042640; 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 East Park Reservoir?
Normal highs sit between 65°F and 85°F in April, May and October. Of those, October 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 USC00042640.
When is the last frost at East Park Reservoir?
In East Park Reservoir, the last spring frost (32°F) comes after April 6 in half of years and after April 25 in one year in ten; the first autumn frost comes before November 10 in half of years and before October 27 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
- April 61 year in 10 after April 25; 9 in 10 after March 6
- First autumn frost, half of years before
- November 101 year in 10 before October 27; 9 in 10 before November 23
NOAA puts the median frost-free season at 219 days, and the season without a hard freeze (28°F) at 267 days.
A hard freeze (28°F) comes after March 2 in half of springs and before November 24 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts East Park Reservoir in zone 9a in ZIP code 95979, 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 USC00042640; 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 East Park Reservoir?
In a normal year in East Park Reservoir, 81 days a year reach 90°F (15 of them 100°F or more), 60 nights fall to 32°F or colder and 58 days bring measurable precipitation.
- Days at 90°F or more
- 81a normal year
- Days at 100°F or more
- 15a normal year
- Nights at 32°F or colder
- 60a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 58a normal year
- Days with 1 inch of snow or more
- fewer than 1a normal year
The highest temperature in this station's record (since 1910) is 115°F, on July 20, 1988; the lowest is 3°F, on December 11, 1932.
The wettest calendar year on that record is 1998, with 42.01 in; the snowiest season is 1948–49, with 76.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00042640; records: ACIS (NOAA Regional Climate Centers), station USC00042640. Records use complete months only; a month missing more than three days is left out.
How sunny is it at East Park Reservoir?
Over a year 88% of the sunlight that would reach the ground under clear skies gets through the clouds at East Park Reservoir, 5.2 kWh per square metre a day. July is the sunniest month (98%) and December the cloudiest (70%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 72% | 2.2 |
| February | 76% | 3.2 |
| March | 78% | 4.5 |
| April | 83% | 6.0 |
| May | 88% | 7.3 |
| June | 94% | 8.2 |
| July | 98% | 8.3 |
| August | 97% | 7.3 |
| September | 95% | 5.9 |
| October | 89% | 4.2 |
| November | 80% | 2.6 |
| December | 70% | 1.9 |
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 East Park Reservoir record?
A normal year at East Park Reservoir brings 3,258 heating degree days, 39% fewer than the median U.S. place (5,373), and 1,196 cooling degree days, 32% more than 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 4,039 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 640 | 0 |
| February | 505 | 0 |
| March | 443 | 0 |
| April | 297 | 5 |
| May | 132 | 70 |
| June | 23 | 198 |
| July | 1 | 371 |
| August | 2 | 313 |
| September | 16 | 187 |
| October | 142 | 52 |
| November | 423 | 0 |
| December | 634 | 0 |
| Year (annual) | 3,258 | 1,196 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00042640. 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 East Park Reservoir's climate compare?
East Park Reservoir is warmer than 79 of the 219 places with their own NOAA record in California, and wetter than 144. Across the 7,247 U.S. stations with normals, its annual mean of 59.3°F is warmer than 73%.
In the Köppen classification computed from these normals, East Park Reservoir 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 East Park Reservoir share this climate record?
2 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.
- Lodoga, CA274 people · 4 mi S
- Stonyford, CA98 people · 2 mi NW
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 East Park Reservoir's climate
What is the coldest month at East Park Reservoir?
January, with a normal high of 57°F and a normal low of 32°F. The warmest is July (94°F by day, 60°F at night).
Does it snow at East Park Reservoir?
Yes: 1 inch in a normal year, falling on 0 days with 0.1 inch or more, the most in January (0.7 inches).
What is the rainiest month at East Park Reservoir?
January, with 4.98 in of precipitation in a normal year; the driest is July with 0.02 in.
What plant hardiness zone is East Park Reservoir in?
The USDA's 2023 map puts East Park Reservoir in zone 9a in ZIP code 95979, the nearest ZIP area.
How late can frost come at East Park Reservoir?
In half of years the last 32°F night comes after April 6; in one year in ten it comes after April 25. Waiting until April 25 leaves about a one-in-ten chance of a later frost.
Nearby and next
- California climateThe statewide normals and every place in the state
- Stony Gorge Reservoir, CA16 miles from this station, 59.9°F a year
- Willows, CA16 miles from this station, 63.7°F a year
- Colusa, CA29 miles from this station, 61.5°F a year
- Clearlake, CA30 miles from this station, 56.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made