Home / Copperopolis / 31 December 2021
Copperopolis
United States · 31 December 2021
← 30 December 20211 January 2022 →
Average
6.3°C
low 3.4°C · high 9.8°C
Rainfall
0.1mm
dry day
Wind
2.5m/s
daily average
Humidity
83.2%
daily average
Cloud
51%
cover
Pressure
1012hPa
daily average
The temperature ranged from 3.4°C around 07:00 to 9.8°C around 15:00. No measurable rain was recorded during the day.
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
7th percentile
Low temperature
36th percentile
Rainfall
56th percentile
Wind
69th 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 8.8°C, versus 6.3°C on this specific day.
Sun & daylight
Sunrise
07:18
Sunset
16:53
Day length
9h 35m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/Los_Angeles.
Cumulative rainfall through the day.
| Local time | UTC | Temp | Feels | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 08:00 | 5.8°C | 3.5°C | 0 | 1.3 | N | 86 | 1012 |
| 01:00 | 09:00 | 5.6°C | 3.2°C | 0 | 1.5 | N | 88 | 1012 |
| 02:00 | 10:00 | 5.6°C | 3.2°C | 0 | 1.7 | NNW | 91 | 1012 |
| 03:00 | 11:00 | 6.4°C | 4.1°C | 0 | 1.4 | NW | 88 | 1012 |
| 04:00 | 12:00 | 5.5°C | 3.6°C | 0 | 0.8 | W | 88 | 1011 |
| 05:00 | 13:00 | 5.4°C | 3.5°C | 0 | 0.7 | WNW | 88 | 1011 |
| 06:00 | 14:00 | 5°C | 2.7°C | 0 | 1.4 | NNW | 91 | 1011 |
| 07:00 | 15:00 | 3.4°C | 0.6°C | 0.01 | 1.7 | NNW | 95 | 1011 |
| 08:00 | 16:00 | 3.9°C | 0.8°C | 0.02 | 2.3 | NNW | 95 | 1011 |
| 09:00 | 17:00 | 5.3°C | 2.6°C | 0.01 | 2 | NNW | 91 | 1012 |
| 10:00 | 18:00 | 6.2°C | 3.3°C | 0 | 2.2 | NW | 87 | 1012 |
| 11:00 | 19:00 | 7.4°C | 4.2°C | 0.02 | 2.8 | NW | 82 | 1012 |
| 12:00 | 20:00 | 7.8°C | 4.2°C | 0.01 | 3.4 | NW | 80 | 1012 |
| 13:00 | 21:00 | 8.7°C | 4.8°C | 0 | 3.8 | NW | 75 | 1011 |
| 14:00 | 22:00 | 9.7°C | 5.5°C | 0 | 4.2 | NW | 71 | 1011 |
| 15:00 | 23:00 | 9.8°C | 5.3°C | 0 | 4.7 | NW | 69 | 1012 |
| 16:00 | 00:00 | 9.5°C | 5.6°C | 0 | 3.6 | NW | 67 | 1012 |
| 17:00 | 01:00 | 8.6°C | 5.2°C | 0 | 3 | NW | 72 | 1012 |
| 18:00 | 02:00 | 7.5°C | 4.2°C | 0 | 2.9 | NNW | 77 | 1012 |
| 19:00 | 03:00 | 5.7°C | 2.1°C | 0 | 2.9 | NNW | 82 | 1013 |
| 20:00 | 04:00 | 5.7°C | 2.2°C | 0 | 2.8 | NNW | 82 | 1014 |
| 21:00 | 05:00 | 4.8°C | 1.2°C | 0 | 2.8 | NNW | 83 | 1014 |
| 22:00 | 06:00 | 4.1°C | 0.5°C | 0 | 2.6 | NNW | 84 | 1015 |
| 23:00 | 07:00 | 4°C | 0.6°C | 0 | 2.4 | N | 82 | 1016 |
Nearby cities
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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
- Copperopolis — 38.000°, -120.750°, ERA5 grid cell center, 9.7 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- The hourly and daily record for 31 December 2021 specifically — not a monthly average. See the Copperopolis 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 (2026-07-21). Historical climate data for Copperopolis, United States (38.00°N, 120.75°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Copperopolis, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 21, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Copperopolis, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 21, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Copperopolis, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-21},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.