Winters, California climate: Normal weather by month, frost dates and records
Winters's normal year runs from 38°F January nights to 95°F July afternoons, with 23.8 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 17.0°C, January lows of 3°C, July highs of 35°C, 604 mm of precipitation a year.
- NOAA stationWinters
- Station IDUSC00049742
- Location38.53°N 121.98°W
- Elevation135 ft (41 m)
- Population7,825
On October 22, the normal high in Winters is 78°F and the normal low 49°F, and the chance of measurable rain or snow is 14%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Winters.
- Jan 57° 38°
- Feb 62° 41°
- Mar 68° 44°
- Apr 74° 48°
- May 83° 53°
- Jun 90° 58°
- Jul 95° 60°
- Aug 95° 59°
- Sep 91° 57°
- Oct 81° 50°
- Nov 66° 42°
- Dec 57° 37°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Winters each month?
July is the warmest month, with normal highs of 95°F; January the coldest, with normal lows of 38°F. The most precipitation falls in January (5.15 in), the least in July (0.01 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 57°F | 38°F | 47.0°F | 5.15 | 15 | <1 | 5 | 9 h 50 min |
| February | 62°F | 41°F | 51.3°F | 5.04 | 12 | <1 | 2 | 10 h 40 min |
| March | 68°F | 44°F | 56.0°F | 3.21 | 10 | <1 | <1 | 11 h 50 min |
| April | 74°F | 48°F | 60.8°F | 1.38 | 6 | 2 | <1 | 13 h 10 min |
| May | 83°F | 53°F | 67.7°F | 0.80 | 4 | 8 | <1 | 14 h 10 min |
| June | 90°F | 58°F | 74.0°F | 0.15 | 1 | 18 | <1 | 14 h 50 min |
| July | 95°F | 60°F | 77.4°F | 0.01 | <1 | 28 | <1 | 14 h 40 min |
| August | 95°F | 59°F | 76.7°F | 0.02 | <1 | 27 | <1 | 13 h 40 min |
| September | 91°F | 57°F | 73.7°F | 0.09 | 1 | 20 | <1 | 12 h 30 min |
| October | 81°F | 50°F | 65.4°F | 0.87 | 3 | 5 | <1 | 11 h 20 min |
| November | 66°F | 42°F | 54.3°F | 2.19 | 8 | <1 | 1 | 10 h 10 min |
| December | 57°F | 37°F | 47.0°F | 4.86 | 13 | <1 | 7 | 9 h 30 min |
| Year (annual) | 77°F | 49°F | 62.6°F | 23.77 | 74 | 107 | 15 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 14°C | 3°C | 8.3°C | 131 mm |
| February | 17°C | 5°C | 10.7°C | 128 mm |
| March | 20°C | 7°C | 13.3°C | 82 mm |
| April | 23°C | 9°C | 16.0°C | 35 mm |
| May | 28°C | 12°C | 19.8°C | 20 mm |
| June | 32°C | 14°C | 23.3°C | 4 mm |
| July | 35°C | 15°C | 25.2°C | 0 mm |
| August | 35°C | 15°C | 24.8°C | 1 mm |
| September | 33°C | 14°C | 23.2°C | 2 mm |
| October | 27°C | 10°C | 18.6°C | 22 mm |
| November | 19°C | 6°C | 12.4°C | 56 mm |
| December | 14°C | 3°C | 8.3°C | 123 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00049742; 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.
When is the best weather to visit Winters?
Normal highs sit between 65°F and 85°F in March, April, May, October and November. Of those, October has the fewest days with rain (3).
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 USC00049742.
When is the last frost in Winters?
In Winters, the last spring frost (32°F) comes after February 18 in half of years and after March 14 in one year in ten; the first autumn frost comes before November 30 in half of years and before November 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
- February 181 year in 10 after March 14; 9 in 10 after January 17
- First autumn frost, half of years before
- November 301 year in 10 before November 15; 9 in 10 before December 18
NOAA puts the median frost-free season at 284 days, and the season without a hard freeze (28°F) at 336 days.
A hard freeze (28°F) comes after January 14 in half of springs and before December 15 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Winters in zone 9b in ZIP code 95694, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Winters's NOAA station is in zone 9b: the coldest night of a typical year reaches 27°F (30 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 USC00049742; 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 in Winters?
In a normal year in Winters, 107 days a year reach 90°F (27 of them 100°F or more), 15 nights fall to 32°F or colder and 74 days bring measurable precipitation.
- Days at 90°F or more
- 107a normal year
- Days at 100°F or more
- 27a normal year
- Nights at 32°F or colder
- 15a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 74a normal year
The highest temperature in this station's record (since 1942) is 115°F, on June 16, 1961; the lowest is 15°F, on December 23, 1990.
The wettest calendar year on that record is 1983, with 47.12 in; the snowiest season is 1972–73, with 3.3 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00049742; records: ACIS (NOAA Regional Climate Centers), station USC00049742. Records use complete months only; a month missing more than three days is left out.
How sunny is Winters?
Over a year 89% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Winters, 5.2 kWh per square metre a day. July is the sunniest month (98%) and January the cloudiest (70%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 70% | 2.2 |
| February | 77% | 3.3 |
| March | 80% | 4.6 |
| April | 85% | 6.2 |
| May | 91% | 7.5 |
| June | 95% | 8.3 |
| July | 98% | 8.2 |
| August | 98% | 7.4 |
| September | 96% | 6.0 |
| October | 91% | 4.3 |
| November | 81% | 2.8 |
| December | 71% | 2.0 |
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 much heating and cooling does Winters need?
A normal year in Winters brings 2,392 heating degree days, 55% fewer than the median U.S. place (5,373), and 1,541 cooling degree days, 70% more than the median (908). Four months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 4,933 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 558 | 0 |
| February | 385 | 0 |
| March | 284 | 5 |
| April | 154 | 29 |
| May | 50 | 134 |
| June | 6 | 276 |
| July | 0 | 385 |
| August | 0 | 361 |
| September | 4 | 266 |
| October | 72 | 83 |
| November | 323 | 2 |
| December | 556 | 0 |
| Year (annual) | 2,392 | 1,541 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00049742. 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.
Has Winters been warmer than normal lately?
2025 averaged 63.8°F, 1.2°F above the 1991-2020 normal of 62.6°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 63.1°F | +0.5°F | 22.80 |
| 2022 | 63.8°F | +1.2°F | 11.53 |
| 2023 | 62.0°F | −0.6°F | 34.52 |
| 2024 | 64.3°F | +1.7°F | 26.20 |
| 2025 | 63.8°F | +1.2°F | 19.73 |
Over 73 complete years from 1943 to 2025, the station's annual mean temperature rose at a fitted 4.1°F per century (+0.23°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00049742; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Winters's climate compare?
Winters is warmer than 137 of the other 218 places with their own NOAA record in California, and wetter than 152. Across the 7,247 U.S. stations with normals, its annual mean of 62.6°F is warmer than 82%.
In the Köppen classification computed from these normals, Winters 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 Winters share this climate record?
Esparto 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.
- Esparto, CA3,744 people · 12 mi N
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 Winters's climate
What is the coldest month in Winters?
January, with a normal high of 57°F and a normal low of 38°F. The warmest is July (95°F by day, 60°F at night).
Does it snow in Winters?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month in Winters?
January, with 5.15 in of precipitation in a normal year; the driest is July with 0.01 in.
What plant hardiness zone is Winters in?
The USDA's 2023 map puts Winters in zone 9b in ZIP code 95694, the nearest ZIP area. By the same method at Winters's NOAA station, the coldest night of a typical year reaches 27°F (30 years, 1991-2020): zone 9b.
How late can frost come in Winters?
In half of years the last 32°F night comes after February 18; in one year in ten it comes after March 14. Waiting until March 14 leaves about a one-in-ten chance of a later frost.
Nearby and next
- California climateThe statewide normals and every place in the state
- Lake Solano, CA2 miles from this station, 62.9°F a year
- Markley Cove, CA8 miles from this station, 60.7°F a year
- Vacaville, CA11 miles from this station, 62.1°F a year
- Davis, CA11 miles from this station, 61.6°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made