Home / Copperopolis / 4 January 2021
Copperopolis
United States · 4 January 2021
← 3 January 20215 January 2021 →
Average
11.6°C
low 6.9°C · high 14.3°C
Rainfall
10.9mm
rain recorded
Wind
2.7m/s
daily average
Humidity
79.9%
daily average
Cloud
86%
cover
Pressure
1021hPa
daily average
The temperature ranged from 6.9°C around 23:00 to 14.3°C around 11:00. Rain was recorded across 9 hours, from around 02:00 to 18:00 (10.9mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
59th percentile
Low temperature
65th percentile
Rainfall
82th 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 9.1°C, versus 11.6°C on this specific day.
Sun & daylight
Sunrise
07:19
Sunset
16:57
Day length
9h 38m
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 | 10.9°C | 9.5°C | 0 | 1.4 | ESE | 82 | 1022 |
| 01:00 | 09:00 | 10.3°C | 9°C | 0.01 | 1.2 | ESE | 88 | 1022 |
| 02:00 | 10:00 | 10.8°C | 9.4°C | 0.11 | 1.5 | E | 84 | 1021 |
| 03:00 | 11:00 | 11.5°C | 9.9°C | 0.07 | 1.7 | SE | 81 | 1021 |
| 04:00 | 12:00 | 11.4°C | 9.5°C | 0 | 2.2 | ESE | 82 | 1021 |
| 05:00 | 13:00 | 11.6°C | 9.4°C | 0 | 2.6 | SE | 80 | 1021 |
| 06:00 | 14:00 | 11.9°C | 9.4°C | 0 | 3.1 | ESE | 78 | 1021 |
| 07:00 | 15:00 | 11.6°C | 8.5°C | 0 | 3.8 | SE | 78 | 1020 |
| 08:00 | 16:00 | 12°C | 8.4°C | 0 | 4.2 | SE | 74 | 1020 |
| 09:00 | 17:00 | 12.9°C | 9.1°C | 0 | 4.7 | SSE | 71 | 1021 |
| 10:00 | 18:00 | 13.6°C | 9.4°C | 0 | 5 | SE | 65 | 1021 |
| 11:00 | 19:00 | 14.3°C | 9.9°C | 0.81 | 5.4 | SSE | 63 | 1020 |
| 12:00 | 20:00 | 14°C | 9.9°C | 1.58 | 5.1 | SSE | 66 | 1020 |
| 13:00 | 21:00 | 13.3°C | 9.7°C | 2.55 | 4.9 | SSE | 77 | 1019 |
| 14:00 | 22:00 | 13.3°C | 10°C | 1.81 | 4.4 | S | 76 | 1020 |
| 15:00 | 23:00 | 13.6°C | 11.4°C | 1.11 | 3 | S | 77 | 1020 |
| 16:00 | 00:00 | 13.8°C | 12.4°C | 1.35 | 2.1 | SSW | 79 | 1020 |
| 17:00 | 01:00 | 13.4°C | 12.1°C | 0.92 | 1.9 | WSW | 81 | 1022 |
| 18:00 | 02:00 | 11.8°C | 10.4°C | 0.46 | 1.6 | W | 80 | 1023 |
| 19:00 | 03:00 | 9.7°C | 8.9°C | 0.09 | 0.6 | SSE | 92 | 1023 |
| 20:00 | 04:00 | 10.3°C | 9.4°C | 0.01 | 0.9 | E | 90 | 1024 |
| 21:00 | 05:00 | 8.4°C | 6.9°C | 0 | 1.1 | ENE | 91 | 1024 |
| 22:00 | 06:00 | 7.6°C | 5.8°C | 0 | 1.3 | NE | 90 | 1024 |
| 23:00 | 07:00 | 6.9°C | 5.1°C | 0 | 1.2 | NE | 92 | 1024 |
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 4 January 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 (2026-07-19). 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 19, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Copperopolis, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 19, 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 2026-07-19},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.