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Summit

United States · 20 December 2021

← 19 December 202121 December 2021 →

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Average

2.7°C

low 1.7° · high 3.5°

Rainfall

7.1mm

rain recorded

Wind

2.2m/s

daily average

Humidity

87%

daily average

Cloud

100%

cover

Pressure

1018hPa

daily average

The temperature ranged from 1.7°C around 11:00 to 3.5°C around 17:00. Rain was recorded across 16 hours, from around 03:00 to 18:00 (7.1mm total).

How unusual was this day?

Compared against the same 135 calendar days (±7 days) across the other 9 years on file.

High temperature

12th percentile

Low temperature

34th percentile

Rainfall

66th percentile

Wind

41th percentile

A percentile of 100 means this was the hottest/wettest/windiest of the comparable days on file; 50 is right in the middle. This window's average temperature was 5°C, versus 2.7°C on this specific day.

Sun & daylight

Sunrise

07:52

Sunset

16:21

Day length

8h 28m

Hour by hour

Temperature (line) and hourly rainfall (bars), local time — America/Los_Angeles.

↓ Download CSV
00:0006:0012:0018:0023:00

Cumulative rainfall through the day.

00:0006:0012:0018:0023:00
Local timeUTCTemp °CFeels °CRain mmWind m/sDirHumidity %Pressure hPa
00:0008:002.8-102.6NE801015
01:0009:002.6-10.012.4ENE831015
02:0010:002.4-1.50.042.6ENE791015
03:0011:002.3-1.30.12.1ENE801016
04:0012:002.5-10.192.1ENE801016
05:0013:002.4-1.10.222.1NE821015
06:0014:002.3-1.20.442.2ENE841016
07:0015:002.2-1.40.452.3NE881016
08:0016:002.2-1.20.542.2NE891016
09:0017:002.2-1.30.872.3NE901017
10:0018:002-1.41.142.2NE911017
11:0019:001.7-1.40.451.9NE951018
12:0020:002.2-0.90.441.8NNE921018
13:0021:002.5-0.70.441.9NNE891018
14:0022:002.9-0.40.522.2NE881018
15:0023:003.1-0.20.442.1NNE871019
16:0000:003.50.40.281.9NNE851019
17:0001:003.5-0.10.192.7N851020
18:0002:003.3-0.40.122.7NNE881020
19:0003:002.9-0.50.082.3NNE901021
20:0004:002.9-0.40.052.1NNE891021
21:0005:003.1-0.10.022NNE911021
22:0006:003.20.10.032NNE911022
23:0007:003.30.30.042NNE911022

Same date, other years

202520242023202220202019201820172016

Nearby cities

Federal Way

0km away, same day

Auburn

0km away, same day

South Hill

0km away, same day

Puyallup

0km away, same day

Bonney Lake

0km away, same day

Lea Hill

0km away, same day

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Data source & coverage — ERA5 reanalysis, 2016–2025 (10 years)details
Source
ERA5 reanalysis, accessed via the Copernicus Climate Change Service (C3S) Climate Data Store
Data type
Reanalysis — a physically consistent reconstruction combining a forecast model with historical observations, not a live station reading or a forecast
Coverage
2016–2025 (10 years) for United States
Location
Summit — 47.250°, -122.250°, ERA5 grid cell center, 12.7 km from requested point
Time zone
America/Los_Angeles
What's shown here
The hourly and daily record for 20 December 2021 specifically — not a monthly average. See the Summit climate overview for typical conditions.
Spatial resolution
0.25° (~25 km) distributed grid — ERA5's native model resolution is finer; this is the publicly distributed regridded product
Version / refreshed
Methodology v2026.07 · data last refreshed December 31, 2025
Limitations
A model reconstruction, not a station observation — hyper-local extremes (a single storm cell, an urban heat pocket) can differ from a nearby gauge. See the full methodology.
Attribution
Generated using Copernicus Climate Change Service information

Cite this data

Plain text
PastClimate (2026-07-16). Historical climate data for Summit, United States (47.25°N, 122.25°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
APA
PastClimate. (2026). Historical climate data for Summit, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 16, 2026, from https://www.pastclimate.com/
MLA
"Historical Climate Data for Summit, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 16, 2026, www.pastclimate.com.
BibTeX
@misc{pastclimate,
  author = {PastClimate},
  title = {Historical climate data for Summit, United States},
  year = {2026},
  note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-16},
  url = {https://www.pastclimate.com/}
}

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