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East Hill-Meridian, Washington climate

Csb Warm-summer Mediterranean

East Hill-Meridian has a seasonal cool-temperate climate (Warm-summer Mediterranean, Köppen Csb). The hottest month is July with an average daily high near 26°C, while the coldest is December averaging around 2°C at night. Precipitation totals about 1018 mm a year and is strongly seasonal — November alone averages 158 mm while July barely receives 17 mm.

☀️ Summers

Warm

Highs near 26°C in July.

About 3 days a year above 32 °C

❄️ Winters

Chilly

Lows near 2°C in December.

About 37 freezing nights a year

🌧️ Rain

Wet

About 1018 mm of rain a year.

Wettest in November

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

+0.9 °C vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

East Hill-Meridian climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	9	11	13	16	20	22	26	26	23	16	12	8
Avg temp (°C)	6	7	9	11	15	17	20	20	17	12	8	5
Avg low (°C)	2	2	4	6	9	12	14	14	11	8	4	2
Precipitation (mm)	147	101	111	78	53	43	17	23	38	103	158	146

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	9	11	13	16	20	22
Avg temp (°C)	6	7	9	11	15	17
Avg low (°C)	2	2	4	6	9	12
Precipitation (mm)	147	101	111	78	53	43

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	26	26	23	16	12	8
Avg temp (°C)	20	20	17	12	8	5
Avg low (°C)	14	14	11	8	4	2
Precipitation (mm)	17	23	38	103	158	146

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	17	15	16	14	10	8	4	4	7	13	18	17
Days with high ≥ 32°C (days)	—	—	—	—	0.1	0.5	2	1	—	—	—	—
Days with low ≤ 0°C (days)	9	8	4	0.5	0.0	—	—	—	0.0	0.6	6	10
Days with snowfall ≥ 2.5 cm (days)	0.0	0.2	—	—	—	—	—	—	—	—	0.0	0.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	17	15	16	14	10	8
Days with high ≥ 32°C (days)	—	—	—	—	0.1	0.5
Days with low ≤ 0°C (days)	9	8	4	0.5	0.0	—
Days with snowfall ≥ 2.5 cm (days)	0.0	0.2	—	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	4	4	7	13	18	17
Days with high ≥ 32°C (days)	2	1	—	—	—	—
Days with low ≤ 0°C (days)	—	—	0.0	0.6	6	10
Days with snowfall ≥ 2.5 cm (days)	—	—	—	—	0.0	0.2

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	76	72	74	73	69	66	48	48	51	66	75	75
Clear days (≤ 30% cloud)	3	4	3	3	4	4	11	11	10	5	3	2
Partly cloudy days (30–70%)	7	7	6	8	8	9	10	10	9	9	6	7
Cloudy days (≥ 70%)	22	18	22	19	19	17	10	10	11	17	21	21
Relative humidity (%)	90	87	85	82	80	80	78	76	77	83	89	90
Wind speed (m/s)	0.8	0.8	0.8	0.8	0.6	0.6	0.5	0.5	0.6	0.8	0.9	0.9

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	76	72	74	73	69	66
Clear days (≤ 30% cloud)	3	4	3	3	4	4
Partly cloudy days (30–70%)	7	7	6	8	8	9
Cloudy days (≥ 70%)	22	18	22	19	19	17
Relative humidity (%)	90	87	85	82	80	80
Wind speed (m/s)	0.8	0.8	0.8	0.8	0.6	0.6

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	48	48	51	66	75	75
Clear days (≤ 30% cloud)	11	11	10	5	3	2
Partly cloudy days (30–70%)	10	10	9	9	6	7
Cloudy days (≥ 70%)	10	10	11	17	21	21
Relative humidity (%)	78	76	77	83	89	90
Wind speed (m/s)	0.5	0.5	0.6	0.8	0.9	0.9

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Kent (NOAA GHCN station USC00454169), about 5 km from the city centre.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →