Arlington climate — normals and trends
Arlington (United States) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 9.7 °C and it receives 1,785 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 (17.1 °C on average) and the coldest is January (3.1 °C). Rainfall peaks in November.
Arlington averages 44 frost days, 3 hot days (≥ 30 °C) and 169 rainy days per year.
Arlington has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The number of frost days there went from about 62 to 26 per year over the period.
The hottest day of the period reached 38.8 °C (on 28 June 2021) and the coldest -18.9 °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
ArlingtonWashington
- coords
- 48.20°, -122.13°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.7°C
Average daily high
13.7°C
Average daily low
6.1°C
Annual rainfall
1,785mm
Sunshine / day
8.4h
Mean relative humidity
79%
Average peak wind
12.6km/h
Seasonal range
14.0°C
Frost days (< 0 °C)
44 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
169 d/yr
Annual snowfall
88.4 cm
Average feels-like high
12.1 °C
Average feels-like low
3.8 °C
Average peak gust
32.6 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °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
38.8 °C
28 June 2021
Coldest day
-18.9 °C
21 December 1990
Wettest day
90 mm
20 October 2003
Windiest day
41.9 km/h
13 October 1962
Strongest gust
114.8 km/h
13 February 1979
Hottest feels-like
43.2 °C
28 June 2021
Coldest feels-like
-24.1 °C
21 December 1990
Snowiest day
30.4 cm
21 January 1954
Sunniest day
15.8 h
10 June 1940
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 | 6.4 °C | +0.7 °C | 92 mm | -147 mm |
| Feb | 6.6 °C | -1.1 °C | 176 mm | -10 mm |
| Mar | 10.8 °C | +0.9 °C | 238 mm | +51 mm |
| Apr | 14.6 °C | +1.7 °C | 100 mm | -40 mm |
| May | 16.6 °C | +0.1 °C | 74 mm | -25 mm |
| Jun | 19.9 °C | +0.8 °C | 21 mm | -51 mm |
| Jul | 23.1 °C | +0.8 °C | 6 mm | -30 mm |
| Aug | 23.1 °C | +0.7 °C | 98 mm | +51 mm |
| Sep | 20.5 °C | +1.0 °C | 35 mm | -57 mm |
| Oct | 13.7 °C | -0.2 °C | 205 mm | +17 mm |
| Nov | 10.7 °C | +2.1 °C | 229 mm | -25 mm |
| Dec | 8.1 °C | +2.3 °C | 380 mm | +131 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 Arlington?
Arlington has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 9.7 °C and it receives 1,785 mm of precipitation per year.
What is the hottest day ever recorded in Arlington?
The hottest day measured in Arlington between 1940 and 2025 was 28 June 2021, reaching 38.8 °C.
What is the coldest day in Arlington?
The coldest day measured in Arlington between 1940 and 2025 was 21 December 1990, at -18.9 °C.
Does it snow in Arlington?
Yes. Arlington gets on average 88.4 cm of snow per year and has around 44 frost days.
Has the climate of Arlington warmed?
Yes: Arlington warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Arlington?
The wettest day measured in Arlington between 1940 and 2025 was 20 October 2003, with 90 mm of rain in 24 hours.
What was the windiest day in Arlington?
The windiest day measured in Arlington between 1940 and 2025 was 13 October 1962, with winds reaching 41.9 km/h.
What is the warmest month in Arlington?
The warmest month in Arlington is July (17.1 °C on average); the coldest is January (3.1 °C).
How much does it rain in Arlington?
Arlington receives on average 1,785 mm of precipitation per year, spread over about 169 rainy days.
Is it sunny in Arlington?
Arlington gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.
What is the biggest single-day snowfall in Arlington?
The heaviest 24-hour snowfall measured in Arlington between 1940 and 2025 was 21 January 1954, with 30.4 cm.
Are there tropical nights in Arlington?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Arlington.
What was the most extreme apparent temperature in Arlington?
In Arlington, between 1940 and 2025, the highest apparent temperature reached 43.2 °C on 28 June 2021, and the lowest was -24.1 °C on 21 December 1990.
Compare Arlington with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Arlington