Greenfield climate — normals and trends
Greenfield (United States) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 14.7 °C and it receives 394 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (22.6 °C on average) and the coldest is January (8.0 °C). Rainfall peaks in January.
Greenfield averages 12 frost days, 65 hot days (≥ 30 °C) and 44 rainy days per year.
Greenfield has warmed by +1.6 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.
The number of frost days there went from about 20 to 4 per year over the period.
The hottest day of the period reached 42.3 °C (on 13 July 1972) and the coldest -6.8 °C (on 5 January 1950).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
GreenfieldCalifornia
- coords
- 36.32°, -121.24°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
14.7°C
Average daily high
21.6°C
Average daily low
8.9°C
Annual rainfall
394mm
Sunshine / day
11.1h
Mean relative humidity
60%
Average peak wind
11.1km/h
Seasonal range
14.6°C
Frost days (< 0 °C)
12 d/yr
Hot days (≥ 30 °C)
65 d/yr
Rainy days (≥ 1 mm)
44 d/yr
Annual snowfall
1.5 cm
Average feels-like high
20.6 °C
Average feels-like low
7.0 °C
Average peak gust
32.6 km/h
Tropical nights (≥ 20 °C)
8 d/yr
Solar radiation
20.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.42 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
42.3 °C
13 July 1972
Coldest day
-6.8 °C
5 January 1950
Wettest day
107 mm
27 January 2021
Windiest day
34.8 km/h
24 December 2025
Strongest gust
119.2 km/h
4 February 2024
Hottest feels-like
44.4 °C
4 July 1991
Coldest feels-like
-11.1 °C
22 December 1990
Snowiest day
11.6 cm
4 January 1974
Sunniest day
14.0 h
9 July 2025
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 16.3 °C | +2.8 °C | 4 mm | -75 mm |
| Feb | 16.4 °C | +1.7 °C | 93 mm | +15 mm |
| Mar | 16.0 °C | -0.2 °C | 68 mm | +0 mm |
| Apr | 20.5 °C | +1.4 °C | 10 mm | -19 mm |
| May | 25.1 °C | +2.2 °C | 1 mm | -10 mm |
| Jun | 28.2 °C | +0.9 °C | 0 mm | -2 mm |
| Jul | 29.8 °C | -1.4 °C | 0 mm | -1 mm |
| Aug | 31.4 °C | +0.6 °C | 0 mm | -1 mm |
| Sep | 28.1 °C | -0.4 °C | 6 mm | +2 mm |
| Oct | 22.4 °C | -1.3 °C | 25 mm | +9 mm |
| Nov | 18.7 °C | +1.0 °C | 78 mm | +39 mm |
| Dec | 15.8 °C | +1.9 °C | 101 mm | +34 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Greenfield?
Greenfield has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 14.7 °C and it receives 394 mm of precipitation per year.
What is the hottest day ever recorded in Greenfield?
The hottest day measured in Greenfield between 1940 and 2025 was 13 July 1972, reaching 42.3 °C.
What is the coldest day in Greenfield?
The coldest day measured in Greenfield between 1940 and 2025 was 5 January 1950, at -6.8 °C.
Does it snow in Greenfield?
Yes. Greenfield gets on average 1.5 cm of snow per year and has around 12 frost days.
Has the climate of Greenfield warmed?
Yes: Greenfield warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Greenfield?
The wettest day measured in Greenfield between 1940 and 2025 was 27 January 2021, with 107 mm of rain in 24 hours.
What was the windiest day in Greenfield?
The windiest day measured in Greenfield between 1940 and 2025 was 24 December 2025, with winds reaching 34.8 km/h.
What is the warmest month in Greenfield?
The warmest month in Greenfield is July (22.6 °C on average); the coldest is January (8.0 °C).
How much does it rain in Greenfield?
Greenfield receives on average 394 mm of precipitation per year, spread over about 44 rainy days.
Is it sunny in Greenfield?
Greenfield gets on average 11.1 hours of sunshine per day, roughly 4,052 hours per year over 1940-2025.
What is the biggest single-day snowfall in Greenfield?
The heaviest 24-hour snowfall measured in Greenfield between 1940 and 2025 was 4 January 1974, with 11.6 cm.
Are there tropical nights in Greenfield?
Yes: Greenfield has on average 8 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Greenfield?
In Greenfield, between 1940 and 2025, the highest apparent temperature reached 44.4 °C on 4 July 1991, and the lowest was -11.1 °C on 22 December 1990.
Compare Greenfield with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Greenfield