Home / Copperopolis / 4 January 2018
Copperopolis
United States · 4 January 2018
← 3 January 20185 January 2018 →
Average
14.4°C
low 11.9° · high 19.6°
Rainfall
5.3mm
rain recorded
Wind
3m/s
daily average
Humidity
71.8%
daily average
Cloud
60%
cover
Pressure
1019hPa
daily average
The temperature ranged from 11.9°C around 02:00 to 19.6°C around 15:00. Rain was recorded across 8 hours, from around 00:00 to 07:00 (5.3mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
100th percentile
Low temperature
99th percentile
Rainfall
75th percentile
Wind
76th 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 14.4°C on this specific day.
Sun & daylight
Sunrise
07:19
Sunset
16:56
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 °C | Feels °C | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 08:00 | 11.9 | 9.2 | 0.52 | 2.1 | SE | 61 | 1017 |
| 01:00 | 09:00 | 11.9 | 9.2 | 0.78 | 2.1 | ESE | 63 | 1018 |
| 02:00 | 10:00 | 11.9 | 9.8 | 1.04 | 2.3 | ESE | 79 | 1019 |
| 03:00 | 11:00 | 12.4 | 9.9 | 1.31 | 3.2 | ESE | 79 | 1019 |
| 04:00 | 12:00 | 12 | 9.2 | 0.77 | 3.5 | ESE | 79 | 1019 |
| 05:00 | 13:00 | 12.3 | 9.6 | 0.36 | 3.5 | ESE | 78 | 1019 |
| 06:00 | 14:00 | 12.3 | 9.5 | 0.17 | 3.3 | SE | 74 | 1019 |
| 07:00 | 15:00 | 12.1 | 9.3 | 0.18 | 3.2 | SE | 75 | 1019 |
| 08:00 | 16:00 | 12.2 | 9.1 | 0 | 3.6 | SE | 74 | 1019 |
| 09:00 | 17:00 | 13.2 | 10.2 | 0.01 | 3.8 | SE | 74 | 1020 |
| 10:00 | 18:00 | 14.3 | 11.6 | 0.06 | 3.7 | SSE | 72 | 1020 |
| 11:00 | 19:00 | 15.3 | 12.2 | 0 | 4.3 | SSE | 69 | 1020 |
| 12:00 | 20:00 | 16.3 | 13.2 | 0 | 4.7 | SSE | 68 | 1019 |
| 13:00 | 21:00 | 18.1 | 14.9 | 0 | 4.6 | SSE | 58 | 1018 |
| 14:00 | 22:00 | 19.2 | 17.3 | 0 | 3.2 | SSE | 59 | 1017 |
| 15:00 | 23:00 | 19.6 | 17.7 | 0 | 3.4 | SSE | 60 | 1017 |
| 16:00 | 00:00 | 19.1 | 18.2 | 0 | 2.2 | S | 63 | 1017 |
| 17:00 | 01:00 | 16.4 | 15 | 0 | 2.5 | S | 71 | 1018 |
| 18:00 | 02:00 | 15.6 | 14.5 | 0 | 1.9 | ESE | 72 | 1018 |
| 19:00 | 03:00 | 14.2 | 13 | 0 | 1.8 | E | 79 | 1018 |
| 20:00 | 04:00 | 13.9 | 12.6 | 0.01 | 2.1 | E | 79 | 1019 |
| 21:00 | 05:00 | 13.6 | 12.1 | 0.02 | 2.2 | ESE | 79 | 1020 |
| 22:00 | 06:00 | 13.7 | 12.2 | 0.06 | 2.2 | ESE | 79 | 1021 |
| 23:00 | 07:00 | 13.8 | 12.1 | 0.01 | 2.7 | ESE | 80 | 1021 |
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 2018 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 (2026-07-18). 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 18, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Copperopolis, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 18, 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 2026-07-18},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.