Home / Summit / 20 December 2020
Summit
United States · 20 December 2020
← 19 December 202021 December 2020 →
Average
9.2°C
low 7.6° · high 11.2°
Rainfall
5mm
rain recorded
Wind
4m/s
daily average
Humidity
88.4%
daily average
Cloud
99%
cover
Pressure
1019hPa
daily average
The temperature ranged from 7.6°C around 23:00 to 11.2°C around 03:00. Rain was recorded across 7 hours, from around 00:00 to 12:00 (5mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
93th percentile
Low temperature
96th percentile
Rainfall
55th percentile
Wind
77th 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 4.6°C, versus 9.2°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.
Cumulative rainfall through the day.
| Local time | UTC | Temp °C | Feels °C | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 08:00 | 10.4 | 5.5 | 1.74 | 6.8 | SSW | 92 | 1014 |
| 01:00 | 09:00 | 10.8 | 6 | 0.87 | 7 | SW | 94 | 1015 |
| 02:00 | 10:00 | 11.1 | 6.2 | 0.56 | 6.9 | SW | 90 | 1015 |
| 03:00 | 11:00 | 11.2 | 6.4 | 0.49 | 6.6 | SW | 88 | 1016 |
| 04:00 | 12:00 | 10.9 | 6.6 | 0.42 | 5.9 | SW | 88 | 1017 |
| 05:00 | 13:00 | 10.3 | 6.1 | 0.34 | 5.4 | SW | 88 | 1017 |
| 06:00 | 14:00 | 10 | 5.9 | 0.07 | 5.3 | SW | 88 | 1018 |
| 07:00 | 15:00 | 9.6 | 5.7 | 0.09 | 5 | SW | 90 | 1019 |
| 08:00 | 16:00 | 9.5 | 5.5 | 0.06 | 5 | SW | 88 | 1019 |
| 09:00 | 17:00 | 9.1 | 5 | 0.02 | 5 | SW | 89 | 1021 |
| 10:00 | 18:00 | 8.9 | 4.9 | 0.01 | 4.8 | SSW | 89 | 1022 |
| 11:00 | 19:00 | 8.7 | 4.9 | 0.05 | 4.5 | SSW | 90 | 1022 |
| 12:00 | 20:00 | 9.2 | 5.6 | 0.11 | 4 | SSW | 87 | 1022 |
| 13:00 | 21:00 | 9.1 | 5.7 | 0.04 | 3.8 | SSW | 87 | 1022 |
| 14:00 | 22:00 | 9 | 5.9 | 0.05 | 3.4 | SSW | 87 | 1021 |
| 15:00 | 23:00 | 9.1 | 6.2 | 0.03 | 3 | SSW | 85 | 1021 |
| 16:00 | 00:00 | 9.1 | 6.5 | 0.01 | 2.6 | S | 85 | 1021 |
| 17:00 | 01:00 | 9 | 6.5 | 0 | 2.4 | S | 84 | 1021 |
| 18:00 | 02:00 | 8.6 | 6.3 | 0 | 2.1 | S | 88 | 1020 |
| 19:00 | 03:00 | 7.9 | 5.8 | 0.01 | 1.7 | S | 89 | 1020 |
| 20:00 | 04:00 | 7.6 | 5.8 | 0.01 | 1.3 | S | 88 | 1020 |
| 21:00 | 05:00 | 7.7 | 5.7 | 0.01 | 1.5 | S | 89 | 1020 |
| 22:00 | 06:00 | 7.6 | 5.9 | 0 | 1.2 | SE | 89 | 1020 |
| 23:00 | 07:00 | 7.6 | 5.7 | 0.01 | 1.3 | SSE | 89 | 1019 |
Nearby cities
Need this verified for an official or legal purpose? Request a weather verification report.
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 2020 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
PastClimate (2026-07-17). 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/
PastClimate. (2026). Historical climate data for Summit, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 17, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Summit, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 17, 2026, www.pastclimate.com.
@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 2026-07-17},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.