Cottage Lake climate — normals and trends

Q: What is the climate of Cottage Lake?

Cottage Lake has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.9 °C and it receives 1,801 mm of precipitation per year.

Q: What is the hottest day ever recorded in Cottage Lake?

The hottest day measured in Cottage Lake between 1940 and 2025 was 28 June 2021, reaching 41.0 °C.

Q: What is the coldest day in Cottage Lake?

The coldest day measured in Cottage Lake between 1940 and 2025 was 21 December 1990, at -21.4 °C.

Q: Does it snow in Cottage Lake?

Yes. Cottage Lake gets on average 54.7 cm of snow per year and has around 44 frost days.

Q: Has the climate of Cottage Lake warmed?

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

Q: What is the wettest day in Cottage Lake?

The wettest day measured in Cottage Lake between 1940 and 2025 was 23 November 1986, with 97 mm of rain in 24 hours.

Q: What was the windiest day in Cottage Lake?

The windiest day measured in Cottage Lake between 1940 and 2025 was 12 December 1995, with winds reaching 42.1 km/h.

Q: What is the warmest month in Cottage Lake?

The warmest month in Cottage Lake is July (17.4 °C on average); the coldest is January (3.4 °C).

Q: How much does it rain in Cottage Lake?

Cottage Lake receives on average 1,801 mm of precipitation per year, spread over about 173 rainy days.

Q: Is it sunny in Cottage Lake?

Cottage Lake gets on average 8.2 hours of sunshine per day, roughly 2,993 hours per year over 1940-2025.

Cottage Lake (United States) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.9 °C and it receives 1,801 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 (17.4 °C on average) and the coldest is January (3.4 °C). Rainfall peaks in November.

Cottage Lake averages 44 frost days, 5 hot days (≥ 30 °C) and 173 rainy days per year.

Cottage Lake has warmed by +1.6 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.

The number of frost days there went from about 58 to 30 per year over the period.

The hottest day of the period reached 41.0 °C (on 28 June 2021) and the coldest -21.4 °C (on 21 December 1990).

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

Cottage LakeWashington

coords: 47.74°, -122.08°
period: 1940–2025 · 86 yrs

CfbTemperate oceanicWarmest monthJulyColdest monthJanuaryWettest monthNovemberDriest monthJuly

Mean daily temperature

9.9°C

Average daily high

14.3°C

Average daily low

5.9°C

Annual rainfall

1,801mm

Sunshine / day

8.2h

Mean relative humidity

79%

Average peak wind

12.7km/h

Seasonal range

14.0°C

Frost days (< 0 °C)

44 d/yr

Hot days (≥ 30 °C)

5 d/yr

Rainy days (≥ 1 mm)

173 d/yr

Annual snowfall

54.7 cm

Average feels-like high

12.8 °C

Average feels-like low

3.5 °C

Average peak gust

32.6 km/h

Tropical nights (≥ 20 °C)

0 d/yr

Solar radiation

12.2 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.6 °C

since 1940

+0.2 °C per decade · r² = 0.40 · 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

41.0 °C

28 June 2021

Coldest day

-21.4 °C

21 December 1990

Wettest day

97 mm

23 November 1986

Windiest day

42.1 km/h

12 December 1995

Strongest gust

110.2 km/h

24 February 1957

Hottest feels-like

45.6 °C

28 June 2021

Coldest feels-like

-26.7 °C

21 December 1990

Snowiest day

24.6 cm

18 November 1946

Sunniest day

15.7 h

17 June 2025

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	30.7 °C16 July 2025	-9.2 °C7 February 2025	10.9 °C	1,779 mm	2	37
2024	32.0 °C9 July 2024	-13.2 °C13 January 2024	10.7 °C	1,781 mm	4	21
2023	32.1 °C15 August 2023	-6.3 °C25 February 2023	11.0 °C	1,299 mm	5	38
2022	33.4 °C30 July 2022	-10.9 °C1 January 2022	10.3 °C	1,841 mm	10	52
2021	41.0 °C28 June 2021	-10.1 °C27 December 2021	10.6 °C	1,947 mm	6	37
2020	34.0 °C16 August 2020	-3.7 °C14 January 2020	10.7 °C	2,112 mm	4	32
2019	29.7 °C12 June 2019	-12.2 °C5 February 2019	10.5 °C	1,425 mm	0	48
2018	32.4 °C8 August 2018	-6.1 °C23 February 2018	10.9 °C	1,788 mm	10	27
2017	32.2 °C3 August 2017	-12.1 °C4 January 2017	10.4 °C	1,849 mm	6	40
2016	33.3 °C19 August 2016	-5.3 °C17 December 2016	11.3 °C	1,734 mm	7	21
2015	33.3 °C19 July 2015	-6.3 °C1 January 2015	11.8 °C	1,599 mm	11	21
2014	33.6 °C11 August 2014	-11.9 °C30 November 2014	11.3 °C	1,927 mm	4	32
2013	31.7 °C11 September 2013	-11.3 °C8 December 2013	10.3 °C	1,559 mm	2	48
2012	31.7 °C16 August 2012	-7.2 °C18 January 2012	10.0 °C	2,066 mm	4	30
2011	28.1 °C21 August 2011	-12.9 °C26 February 2011	9.3 °C	1,845 mm	0	53
2010	33.9 °C14 August 2010	-14.0 °C24 November 2010	10.4 °C	1,742 mm	5	13
2009	38.8 °C29 July 2009	-10.4 °C10 December 2009	10.0 °C	1,637 mm	8	51
2008	31.1 °C17 May 2008	-16.2 °C20 December 2008	9.4 °C	1,648 mm	4	47
2007	33.9 °C11 July 2007	-13.1 °C12 January 2007	9.9 °C	1,808 mm	2	43
2006	34.1 °C21 July 2006	-12.7 °C29 November 2006	10.3 °C	1,755 mm	5	32
2005	31.0 °C26 May 2005	-5.9 °C5 January 2005	10.5 °C	1,525 mm	3	48
2004	32.8 °C23 July 2004	-12.6 °C5 January 2004	11.0 °C	1,699 mm	3	15
2003	31.4 °C29 July 2003	-5.7 °C21 November 2003	10.7 °C	1,631 mm	5	29
2002	32.9 °C13 June 2002	-7.0 °C25 February 2002	9.9 °C	1,441 mm	2	38
2001	29.6 °C9 August 2001	-4.0 °C7 February 2001	9.9 °C	1,662 mm	0	26
2000	30.2 °C27 June 2000	-8.2 °C12 December 2000	9.7 °C	1,390 mm	1	40
1999	29.9 °C13 September 1999	-2.8 °C3 January 1999	9.8 °C	2,115 mm	0	17
1998	34.5 °C27 July 1998	-11.2 °C22 December 1998	10.7 °C	1,667 mm	7	29
1997	29.5 °C4 July 1997	-7.7 °C26 January 1997	10.5 °C	1,991 mm	0	34
1996	31.8 °C14 July 1996	-12.5 °C29 January 1996	9.7 °C	2,284 mm	6	50
1995	33.1 °C30 June 1995	-6.4 °C14 February 1995	10.8 °C	1,930 mm	6	37
1994	34.0 °C20 July 1994	-6.5 °C8 February 1994	10.5 °C	1,760 mm	4	38
1993	32.4 °C3 August 1993	-15.3 °C24 November 1993	9.9 °C	1,440 mm	3	64
1992	30.9 °C11 August 1992	-4.7 °C18 December 1992	11.1 °C	1,509 mm	5	27
1991	35.0 °C23 July 1991	-4.4 °C30 October 1991	10.4 °C	1,646 mm	2	34
1990	34.7 °C11 August 1990	-21.4 °C21 December 1990	10.2 °C	2,349 mm	12	37
1989	31.6 °C22 September 1989	-17.2 °C4 February 1989	10.0 °C	1,686 mm	2	44
1988	36.0 °C2 September 1988	-12.0 °C1 February 1988	10.3 °C	1,703 mm	11	33
1987	33.3 °C31 August 1987	-11.2 °C15 January 1987	10.7 °C	1,225 mm	7	42
1986	32.3 °C26 August 1986	-10.2 °C19 February 1986	10.4 °C	1,630 mm	5	26
1985	34.4 °C19 July 1985	-19.3 °C23 November 1985	9.1 °C	1,496 mm	9	82
1984	31.0 °C24 July 1984	-10.7 °C19 December 1984	9.6 °C	1,880 mm	2	38
1983	33.2 °C28 May 1983	-12.7 °C23 December 1983	10.2 °C	1,843 mm	1	31
1982	35.7 °C18 June 1982	-16.1 °C6 January 1982	9.6 °C	1,892 mm	4	53
1981	36.3 °C9 August 1981	-6.1 °C29 December 1981	10.3 °C	1,823 mm	8	28
1980	30.3 °C21 July 1980	-10.8 °C30 January 1980	9.9 °C	1,648 mm	2	42
1979	35.7 °C16 July 1979	-14.8 °C1 January 1979	10.2 °C	1,616 mm	4	47
1978	34.3 °C8 August 1978	-14.8 °C30 December 1978	9.9 °C	1,575 mm	6	50
1977	34.7 °C17 August 1977	-9.4 °C21 November 1977	9.7 °C	1,876 mm	5	46
1976	28.2 °C15 July 1976	-7.7 °C5 March 1976	9.6 °C	1,561 mm	0	36
1975	29.8 °C4 July 1975	-8.3 °C11 January 1975	9.2 °C	2,213 mm	0	60
1974	31.0 °C2 September 1974	-10.1 °C9 January 1974	9.9 °C	2,153 mm	4	34
1973	32.2 °C14 May 1973	-15.4 °C7 January 1973	9.6 °C	1,801 mm	4	31
1972	33.0 °C7 August 1972	-14.9 °C8 December 1972	9.3 °C	2,429 mm	6	58
1971	34.8 °C29 July 1971	-10.8 °C1 March 1971	9.2 °C	2,229 mm	12	65
1970	34.1 °C2 June 1970	-9.1 °C4 December 1970	9.6 °C	1,851 mm	6	58
1969	33.2 °C17 June 1969	-16.1 °C23 January 1969	9.6 °C	1,696 mm	4	56
1968	31.9 °C31 July 1968	-20.4 °C29 December 1968	9.7 °C	2,226 mm	3	51
1967	34.5 °C28 August 1967	-6.4 °C13 December 1967	10.5 °C	2,126 mm	17	38
1966	31.4 °C15 June 1966	-4.8 °C15 February 1966	9.8 °C	1,791 mm	2	39
1965	36.6 °C31 July 1965	-4.7 °C19 March 1965	9.9 °C	1,770 mm	8	51
1964	28.9 °C11 July 1964	-20.1 °C16 December 1964	8.4 °C	2,312 mm	0	69
1963	34.6 °C21 May 1963	-16.2 °C11 January 1963	9.6 °C	1,714 mm	5	52
1962	31.6 °C27 July 1962	-17.8 °C20 January 1962	9.5 °C	1,736 mm	4	45
1961	35.4 °C12 July 1961	-7.8 °C10 December 1961	10.0 °C	2,127 mm	11	44
1960	36.2 °C9 August 1960	-7.4 °C28 February 1960	9.3 °C	1,939 mm	8	57
1959	31.2 °C31 July 1959	-13.5 °C4 January 1959	9.3 °C	2,564 mm	3	54
1958	35.1 °C27 July 1958	-8.1 °C16 November 1958	11.2 °C	1,961 mm	13	19
1957	29.1 °C13 September 1957	-16.9 °C26 January 1957	9.4 °C	1,610 mm	0	49
1956	33.6 °C19 July 1956	-17.5 °C15 February 1956	9.0 °C	2,028 mm	5	66
1955	32.3 °C9 June 1955	-18.9 °C15 November 1955	7.8 °C	2,118 mm	2	73
1954	27.9 °C29 June 1954	-10.8 °C19 January 1954	8.8 °C	2,117 mm	0	65
1953	30.7 °C7 July 1953	-3.5 °C1 March 1953	9.9 °C	2,548 mm	3	24
1952	31.6 °C4 August 1952	-14.3 °C1 January 1952	9.4 °C	1,179 mm	7	62
1951	34.5 °C12 July 1951	-13.0 °C29 January 1951	9.3 °C	1,784 mm	7	67
1950	29.8 °C21 September 1950	-19.4 °C25 January 1950	8.5 °C	2,208 mm	0	54
1949	29.9 °C14 July 1949	-20.0 °C9 January 1949	8.8 °C	1,897 mm	0	73
1948	32.1 °C7 June 1948	-11.5 °C6 February 1948	8.5 °C	2,144 mm	2	68
1947	28.9 °C26 May 1947	-19.0 °C14 January 1947	9.3 °C	1,903 mm	0	54
1946	31.6 °C20 July 1946	-12.5 °C17 December 1946	8.7 °C	1,926 mm	1	60
1945	34.1 °C6 August 1945	-8.0 °C19 December 1945	9.3 °C	1,808 mm	5	56
1944	35.1 °C30 August 1944	-8.5 °C27 March 1944	9.6 °C	1,318 mm	5	64
1943	30.7 °C24 September 1943	-14.3 °C18 January 1943	9.4 °C	1,132 mm	5	62
1942	34.4 °C15 August 1942	-12.9 °C1 January 1942	9.8 °C	1,301 mm	12	56
1941	38.0 °C17 July 1941	-5.1 °C30 December 1941	10.3 °C	1,203 mm	10	40
1940	34.9 °C18 August 1940	-5.5 °C10 November 1940	10.4 °C	1,390 mm	6	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

15.1 °C

+0.8 °C

Hot days (≥ 30 °C)

2 d/yr

-3

Frost days (< 0 °C)

37 d/yr

-7

Annual rainfall

1779 mm

-22 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	7.0 °C	+0.7 °C	90 mm	-145 mm
Feb	7.3 °C	-1.1 °C	172 mm	-9 mm
Mar	11.4 °C	+0.7 °C	244 mm	+66 mm
Apr	15.2 °C	+1.6 °C	110 mm	-34 mm
May	17.3 °C	+0.2 °C	92 mm	-16 mm
Jun	20.6 °C	+1.0 °C	24 mm	-65 mm
Jul	24.0 °C	+1.0 °C	10 mm	-31 mm
Aug	23.4 °C	+0.5 °C	113 mm	+62 mm
Sep	20.9 °C	+0.9 °C	42 mm	-57 mm
Oct	14.1 °C	-0.4 °C	189 mm	+2 mm
Nov	11.3 °C	+2.1 °C	270 mm	+21 mm
Dec	8.8 °C	+2.4 °C	424 mm	+184 mm

The year's extremes

Hottest day

30.7 °C

16 Jul 2025

Coldest day

-9.2 °C

7 Feb 2025

Wettest day

82.2 mm

10 Dec 2025

Windiest day

31.6 km/h

23 Feb 2025

Strongest gust

85.3 km/h

15 Dec 2025

Hottest feels-like

32.4 °C

16 Jul 2025

Coldest feels-like

-13.8 °C

7 Feb 2025

Snowiest day

5.5 cm

1 Feb 2025

Sunniest day

15.7 h

17 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 Cottage Lake?

Cottage Lake has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.9 °C and it receives 1,801 mm of precipitation per year.

What is the hottest day ever recorded in Cottage Lake?

The hottest day measured in Cottage Lake between 1940 and 2025 was 28 June 2021, reaching 41.0 °C.

What is the coldest day in Cottage Lake?

The coldest day measured in Cottage Lake between 1940 and 2025 was 21 December 1990, at -21.4 °C.

Does it snow in Cottage Lake?

Yes. Cottage Lake gets on average 54.7 cm of snow per year and has around 44 frost days.

Has the climate of Cottage Lake warmed?

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

What is the wettest day in Cottage Lake?

The wettest day measured in Cottage Lake between 1940 and 2025 was 23 November 1986, with 97 mm of rain in 24 hours.

What was the windiest day in Cottage Lake?

The windiest day measured in Cottage Lake between 1940 and 2025 was 12 December 1995, with winds reaching 42.1 km/h.

What is the warmest month in Cottage Lake?

The warmest month in Cottage Lake is July (17.4 °C on average); the coldest is January (3.4 °C).

How much does it rain in Cottage Lake?

Cottage Lake receives on average 1,801 mm of precipitation per year, spread over about 173 rainy days.

Is it sunny in Cottage Lake?

Cottage Lake gets on average 8.2 hours of sunshine per day, roughly 2,993 hours per year over 1940-2025.

What is the biggest single-day snowfall in Cottage Lake?

The heaviest 24-hour snowfall measured in Cottage Lake between 1940 and 2025 was 18 November 1946, with 24.6 cm.

Are there tropical nights in Cottage Lake?

Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Cottage Lake.

What was the most extreme apparent temperature in Cottage Lake?

In Cottage Lake, between 1940 and 2025, the highest apparent temperature reached 45.6 °C on 28 June 2021, and the lowest was -26.7 °C on 21 December 1990.

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