Forest Grove climate — normals and trends

Q: What is the climate of Forest Grove?

Forest Grove has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 11.1 °C and it receives 1,276 mm of precipitation per year.

Q: What is the hottest day ever recorded in Forest Grove?

The hottest day measured in Forest Grove between 1940 and 2025 was 28 June 2021, reaching 45.1 °C.

Q: What is the coldest day in Forest Grove?

The coldest day measured in Forest Grove between 1940 and 2025 was 31 January 1950, at -19.7 °C.

Q: Does it snow in Forest Grove?

Yes. Forest Grove gets on average 32.8 cm of snow per year and has around 35 frost days.

Q: Has the climate of Forest Grove warmed?

Yes: Forest Grove warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Forest Grove?

The wettest day measured in Forest Grove between 1940 and 2025 was 31 October 1994, with 74 mm of rain in 24 hours.

Q: What was the windiest day in Forest Grove?

The windiest day measured in Forest Grove between 1940 and 2025 was 14 November 1981, with winds reaching 50.1 km/h.

Q: What is the warmest month in Forest Grove?

The warmest month in Forest Grove is July (19.2 °C on average); the coldest is January (3.9 °C).

Q: How much does it rain in Forest Grove?

Forest Grove receives on average 1,276 mm of precipitation per year, spread over about 143 rainy days.

Q: Is it sunny in Forest Grove?

Forest Grove gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.

Forest Grove (United States) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 11.1 °C and it receives 1,276 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 (19.2 °C on average) and the coldest is January (3.9 °C). Rainfall peaks in December.

Forest Grove averages 35 frost days, 19 hot days (≥ 30 °C) and 143 rainy days per year.

Forest Grove 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 46 to 24 per year over the period.

The hottest day of the period reached 45.1 °C (on 28 June 2021) and the coldest -19.7 °C (on 31 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

Forest GroveOregon

coords: 45.52°, -123.11°
period: 1940–2025 · 86 yrs

CsbWarm-summer MediterraneanWarmest monthJulyColdest monthJanuaryWettest monthDecemberDriest monthJuly

Mean daily temperature

11.1°C

Average daily high

16.0°C

Average daily low

6.8°C

Annual rainfall

1,276mm

Sunshine / day

8.7h

Mean relative humidity

74%

Average peak wind

13.2km/h

Seasonal range

15.3°C

Frost days (< 0 °C)

35 d/yr

Hot days (≥ 30 °C)

19 d/yr

Rainy days (≥ 1 mm)

143 d/yr

Annual snowfall

32.8 cm

Average feels-like high

14.5 °C

Average feels-like low

4.5 °C

Average peak gust

33.3 km/h

Tropical nights (≥ 20 °C)

1 d/yr

Solar radiation

13.5 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.6 °C

since 1940

+0.2 °C per decade · r² = 0.45 · p = < 0.001

19402025

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

45.1 °C

28 June 2021

Coldest day

-19.7 °C

31 January 1950

Wettest day

74 mm

31 October 1994

Windiest day

50.1 km/h

14 November 1981

Strongest gust

121.3 km/h

12 October 1962

Hottest feels-like

45.0 °C

28 June 2021

Coldest feels-like

-24.3 °C

31 January 1950

Snowiest day

18.2 cm

3 March 1960

Sunniest day

15.2 h

21 June 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	37.4 °C23 August 2025	-5.0 °C12 February 2025	12.4 °C	1,092 mm	29	25
2024	39.3 °C9 July 2024	-10.6 °C13 January 2024	12.2 °C	1,494 mm	32	10
2023	39.8 °C14 August 2023	-11.3 °C25 February 2023	12.3 °C	1,217 mm	36	24
2022	38.4 °C26 July 2022	-8.6 °C22 December 2022	11.9 °C	1,171 mm	39	34
2021	45.1 °C28 June 2021	-5.7 °C12 February 2021	12.3 °C	1,229 mm	28	27
2020	36.6 °C15 August 2020	-4.6 °C4 February 2020	12.1 °C	1,138 mm	22	26
2019	35.7 °C12 June 2019	-4.5 °C6 February 2019	11.5 °C	993 mm	12	35
2018	37.0 °C29 July 2018	-5.8 °C23 February 2018	12.3 °C	1,065 mm	38	18
2017	39.4 °C3 August 2017	-12.3 °C13 January 2017	11.5 °C	1,532 mm	34	38
2016	37.1 °C5 June 2016	-5.0 °C17 December 2016	12.5 °C	1,525 mm	24	23
2015	39.1 °C30 July 2015	-4.3 °C2 January 2015	13.1 °C	1,218 mm	34	16
2014	36.3 °C1 July 2014	-8.4 °C6 February 2014	12.5 °C	1,343 mm	37	25
2013	34.8 °C30 June 2013	-13.0 °C8 December 2013	11.4 °C	817 mm	18	35
2012	38.3 °C4 August 2012	-3.7 °C16 January 2012	11.5 °C	1,565 mm	22	22
2011	34.1 °C10 September 2011	-6.8 °C26 February 2011	10.6 °C	1,158 mm	15	41
2010	36.4 °C15 August 2010	-6.8 °C24 November 2010	11.4 °C	1,531 mm	15	7
2009	42.1 °C29 July 2009	-12.4 °C9 December 2009	11.2 °C	1,033 mm	28	48
2008	37.7 °C16 August 2008	-8.9 °C16 December 2008	10.8 °C	984 mm	24	35
2007	37.3 °C10 July 2007	-7.7 °C12 January 2007	11.1 °C	1,070 mm	15	29
2006	39.1 °C21 July 2006	-6.8 °C20 February 2006	11.7 °C	1,433 mm	30	29
2005	35.9 °C4 August 2005	-4.1 °C12 December 2005	11.5 °C	1,142 mm	19	30
2004	37.9 °C23 July 2004	-9.8 °C6 January 2004	12.1 °C	1,045 mm	27	12
2003	36.8 °C29 July 2003	-7.9 °C30 December 2003	12.0 °C	1,141 mm	29	18
2002	37.0 °C13 August 2002	-6.4 °C29 January 2002	11.3 °C	1,171 mm	20	23
2001	36.1 °C9 August 2001	-3.7 °C7 February 2001	10.9 °C	1,089 mm	9	28
2000	34.3 °C27 June 2000	-4.2 °C12 November 2000	10.9 °C	944 mm	11	29
1999	33.4 °C13 September 1999	-2.5 °C29 December 1999	11.1 °C	1,543 mm	21	15
1998	38.8 °C28 July 1998	-9.9 °C21 December 1998	11.7 °C	1,571 mm	24	21
1997	33.5 °C4 July 1997	-4.7 °C14 January 1997	11.5 °C	1,337 mm	17	27
1996	36.8 °C13 July 1996	-11.2 °C1 February 1996	11.1 °C	1,851 mm	22	34
1995	35.3 °C17 July 1995	-13.6 °C14 February 1995	12.2 °C	1,470 mm	17	19
1994	37.6 °C20 July 1994	-4.3 °C8 February 1994	11.7 °C	1,239 mm	14	31
1993	36.2 °C4 August 1993	-9.8 °C11 January 1993	10.7 °C	991 mm	11	56
1992	37.9 °C22 June 1992	-7.7 °C5 December 1992	12.3 °C	974 mm	21	22
1991	36.8 °C23 July 1991	-6.9 °C27 January 1991	11.4 °C	978 mm	22	33
1990	38.0 °C11 August 1990	-13.8 °C21 December 1990	11.4 °C	1,144 mm	27	34
1989	33.5 °C24 June 1989	-15.4 °C5 February 1989	11.0 °C	937 mm	11	40
1988	39.4 °C2 September 1988	-6.1 °C2 February 1988	11.2 °C	1,027 mm	20	33
1987	37.4 °C31 August 1987	-4.6 °C25 February 1987	11.9 °C	1,051 mm	28	38
1986	35.7 °C26 August 1986	-3.5 °C9 February 1986	11.5 °C	1,179 mm	23	19
1985	37.7 °C19 July 1985	-10.4 °C4 February 1985	10.1 °C	758 mm	25	84
1984	35.7 °C24 July 1984	-7.8 °C19 December 1984	10.6 °C	1,301 mm	11	30
1983	37.0 °C28 May 1983	-13.3 °C23 December 1983	11.2 °C	1,557 mm	10	23
1982	36.4 °C18 June 1982	-14.5 °C6 January 1982	10.6 °C	1,378 mm	22	50
1981	40.0 °C10 August 1981	-3.1 °C6 February 1981	11.2 °C	1,398 mm	18	25
1980	38.5 °C21 July 1980	-11.4 °C28 January 1980	10.7 °C	1,189 mm	10	36
1979	39.1 °C16 July 1979	-13.6 °C1 January 1979	11.2 °C	1,094 mm	11	37
1978	38.4 °C8 August 1978	-10.0 °C30 December 1978	10.6 °C	1,117 mm	15	51
1977	38.2 °C17 August 1977	-7.9 °C9 January 1977	10.7 °C	1,174 mm	18	41
1976	32.2 °C15 July 1976	-5.0 °C28 November 1976	10.5 °C	920 mm	4	38
1975	34.0 °C4 July 1975	-5.9 °C14 December 1975	10.7 °C	1,338 mm	13	47
1974	34.6 °C31 July 1974	-10.0 °C7 January 1974	11.3 °C	1,393 mm	26	27
1973	35.6 °C14 July 1973	-5.9 °C7 January 1973	10.9 °C	1,485 mm	17	28
1972	38.0 °C7 August 1972	-17.2 °C8 December 1972	10.7 °C	1,344 mm	26	47
1971	37.5 °C9 August 1971	-10.2 °C1 March 1971	10.3 °C	1,611 mm	17	49
1970	35.9 °C15 July 1970	-8.2 °C22 December 1970	10.9 °C	1,543 mm	16	34
1969	35.1 °C17 June 1969	-13.2 °C23 January 1969	10.6 °C	1,335 mm	12	48
1968	35.6 °C31 July 1968	-14.7 °C30 December 1968	10.9 °C	1,732 mm	17	36
1967	37.4 °C9 August 1967	-5.4 °C13 December 1967	11.6 °C	1,261 mm	28	25
1966	34.4 °C15 June 1966	-3.9 °C20 January 1966	11.1 °C	1,347 mm	9	28
1965	37.7 °C31 July 1965	-6.4 °C16 December 1965	11.1 °C	1,131 mm	11	33
1964	33.5 °C11 July 1964	-15.6 °C17 December 1964	9.8 °C	1,443 mm	10	44
1963	33.1 °C15 June 1963	-11.8 °C12 January 1963	10.5 °C	1,371 mm	7	43
1962	34.2 °C27 July 1962	-15.6 °C21 January 1962	10.5 °C	1,338 mm	13	39
1961	39.5 °C12 July 1961	-6.3 °C11 December 1961	11.2 °C	1,732 mm	22	30
1960	37.3 °C6 July 1960	-9.5 °C10 January 1960	10.4 °C	1,640 mm	14	52
1959	34.9 °C31 July 1959	-9.3 °C4 January 1959	10.6 °C	1,379 mm	11	32
1958	38.9 °C27 July 1958	-4.3 °C16 November 1958	12.2 °C	1,370 mm	28	19
1957	32.8 °C14 September 1957	-16.5 °C27 January 1957	10.6 °C	1,342 mm	5	36
1956	38.7 °C19 July 1956	-12.0 °C2 February 1956	10.2 °C	1,386 mm	16	50
1955	35.8 °C5 September 1955	-11.2 °C15 November 1955	9.4 °C	1,629 mm	7	58
1954	28.2 °C1 August 1954	-11.1 °C20 January 1954	10.0 °C	1,531 mm	0	43
1953	33.6 °C14 August 1953	-4.7 °C19 February 1953	10.9 °C	1,750 mm	7	17
1952	37.1 °C8 July 1952	-6.8 °C21 February 1952	10.7 °C	1,039 mm	23	47
1951	35.4 °C29 June 1951	-9.5 °C30 January 1951	10.7 °C	1,471 mm	14	52
1950	33.7 °C20 August 1950	-19.7 °C31 January 1950	10.3 °C	1,703 mm	20	46
1949	33.9 °C14 July 1949	-9.9 °C24 January 1949	10.3 °C	1,084 mm	11	56
1948	33.5 °C31 July 1948	-7.5 °C12 February 1948	9.9 °C	1,513 mm	13	52
1947	30.6 °C1 September 1947	-9.0 °C14 January 1947	10.6 °C	1,319 mm	2	34
1946	37.7 °C20 July 1946	-5.4 °C11 February 1946	10.0 °C	1,424 mm	11	47
1945	35.6 °C5 August 1945	-5.2 °C19 December 1945	10.7 °C	1,395 mm	23	49
1944	38.1 °C18 July 1944	-4.1 °C24 December 1944	10.7 °C	876 mm	14	44
1943	33.4 °C24 July 1943	-11.1 °C18 January 1943	10.6 °C	859 mm	22	49
1942	37.4 °C15 August 1942	-9.1 °C1 January 1942	10.9 °C	1,113 mm	25	50
1941	39.4 °C16 July 1941	-3.5 °C30 December 1941	11.2 °C	1,013 mm	19	21
1940	37.2 °C18 August 1940	-3.9 °C25 January 1940	11.5 °C	1,152 mm	20	43

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?

Year

Across the whole year

Average daily high

17.5 °C

+1.5 °C

Hot days (≥ 30 °C)

29 d/yr

+10

Frost days (< 0 °C)

25 d/yr

-10

Annual rainfall

1092 mm

-184 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	8.4 °C	+1.5 °C	87 mm	-98 mm
Feb	8.7 °C	-0.5 °C	155 mm	+9 mm
Mar	12.6 °C	+0.8 °C	209 mm	+54 mm
Apr	17.4 °C	+2.7 °C	63 mm	-41 mm
May	19.6 °C	+1.0 °C	27 mm	-41 mm
Jun	24.0 °C	+2.1 °C	23 mm	-19 mm
Jul	27.8 °C	+1.6 °C	1 mm	-11 mm
Aug	28.2 °C	+2.0 °C	12 mm	-8 mm
Sep	24.5 °C	+1.5 °C	33 mm	-15 mm
Oct	15.9 °C	-0.5 °C	116 mm	+3 mm
Nov	11.6 °C	+1.4 °C	157 mm	-32 mm
Dec	10.4 °C	+3.3 °C	212 mm	+14 mm

The year's extremes

Hottest day

37.4 °C

23 Aug 2025

Coldest day

-5.0 °C

12 Feb 2025

Wettest day

45.2 mm

18 Dec 2025

Windiest day

32.4 km/h

25 Feb 2025

Strongest gust

92.9 km/h

18 Dec 2025

Hottest feels-like

37.7 °C

11 Aug 2025

Coldest feels-like

-9.8 °C

12 Feb 2025

Snowiest day

3.2 cm

14 Feb 2025

Sunniest day

15.2 h

23 Jun 2025

What was the weather like that day?

Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.

Date

Frequently asked questions

What is the climate of Forest Grove?

Forest Grove has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 11.1 °C and it receives 1,276 mm of precipitation per year.

What is the hottest day ever recorded in Forest Grove?

The hottest day measured in Forest Grove between 1940 and 2025 was 28 June 2021, reaching 45.1 °C.

What is the coldest day in Forest Grove?

The coldest day measured in Forest Grove between 1940 and 2025 was 31 January 1950, at -19.7 °C.

Does it snow in Forest Grove?

Yes. Forest Grove gets on average 32.8 cm of snow per year and has around 35 frost days.

Has the climate of Forest Grove warmed?

Yes: Forest Grove warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Forest Grove?

The wettest day measured in Forest Grove between 1940 and 2025 was 31 October 1994, with 74 mm of rain in 24 hours.

What was the windiest day in Forest Grove?

The windiest day measured in Forest Grove between 1940 and 2025 was 14 November 1981, with winds reaching 50.1 km/h.

What is the warmest month in Forest Grove?

The warmest month in Forest Grove is July (19.2 °C on average); the coldest is January (3.9 °C).

How much does it rain in Forest Grove?

Forest Grove receives on average 1,276 mm of precipitation per year, spread over about 143 rainy days.

Is it sunny in Forest Grove?

Forest Grove gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.

What is the biggest single-day snowfall in Forest Grove?

The heaviest 24-hour snowfall measured in Forest Grove between 1940 and 2025 was 3 March 1960, with 18.2 cm.

Are there tropical nights in Forest Grove?

Yes: Forest Grove has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Forest Grove?

In Forest Grove, between 1940 and 2025, the highest apparent temperature reached 45.0 °C on 28 June 2021, and the lowest was -24.3 °C on 31 January 1950.

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