Home / Copperopolis / 21 October 2017
Copperopolis
United States · 21 October 2017
← 20 October 201722 October 2017 →
Average
13.7°C
low 7.5° · high 20.6°
Rainfall
0mm
dry day
Wind
3m/s
daily average
Humidity
56.7%
daily average
Cloud
19%
cover
Pressure
1022hPa
daily average
The temperature ranged from 7.5°C around 06:00 to 20.6°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
20th percentile
Low temperature
16th percentile
Rainfall
76th percentile
Wind
92th 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 16.8°C, versus 13.7°C on this specific day.
Sun & daylight
Sunrise
07:17
Sunset
18:16
Day length
10h 59m
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 | 07:00 | 10.1 | 7.5 | 0 | 2.5 | NW | 78 | 1020 |
| 01:00 | 08:00 | 9.9 | 7.5 | 0 | 2.2 | NW | 79 | 1020 |
| 02:00 | 09:00 | 9.4 | 6.8 | 0 | 2.3 | NNW | 78 | 1021 |
| 03:00 | 10:00 | 8.2 | 6.2 | 0 | 1.3 | NW | 82 | 1021 |
| 04:00 | 11:00 | 7.6 | 4.6 | 0 | 2.5 | WNW | 81 | 1021 |
| 05:00 | 12:00 | 7.5 | 4.8 | 0 | 2.1 | NNW | 80 | 1022 |
| 06:00 | 13:00 | 7.5 | 5.1 | 0 | 1.6 | NNW | 80 | 1022 |
| 07:00 | 14:00 | 7.8 | 5 | 0 | 2.2 | NNW | 78 | 1023 |
| 08:00 | 15:00 | 9.2 | 5.8 | 0 | 2.7 | NNW | 64 | 1023 |
| 09:00 | 16:00 | 11.5 | 8.3 | 0 | 2.5 | NNW | 57 | 1024 |
| 10:00 | 17:00 | 13.7 | 10 | 0 | 2.9 | NW | 45 | 1023 |
| 11:00 | 18:00 | 16.2 | 11.9 | 0 | 4.1 | NW | 42 | 1023 |
| 12:00 | 19:00 | 17.5 | 12.8 | 0 | 4.7 | NW | 40 | 1023 |
| 13:00 | 20:00 | 18.3 | 13.5 | 0 | 5 | NW | 39 | 1023 |
| 14:00 | 21:00 | 20.2 | 14.7 | 0 | 5.1 | NW | 27 | 1022 |
| 15:00 | 22:00 | 20.6 | 15.9 | 0 | 4.8 | NW | 33 | 1022 |
| 16:00 | 23:00 | 20.6 | 16 | 0 | 4.6 | NW | 33 | 1022 |
| 17:00 | 00:00 | 20.5 | 16.2 | 0 | 4.1 | NW | 33 | 1023 |
| 18:00 | 01:00 | 19.8 | 16.2 | 0 | 2.8 | NW | 32 | 1023 |
| 19:00 | 02:00 | 18.3 | 15.1 | 0 | 2.4 | NW | 36 | 1023 |
| 20:00 | 03:00 | 15.2 | 12.7 | 0 | 2.4 | NNW | 56 | 1024 |
| 21:00 | 04:00 | 14.1 | 11.6 | 0 | 2.3 | NNW | 59 | 1024 |
| 22:00 | 05:00 | 13.1 | 10.8 | 0 | 2 | NNW | 63 | 1024 |
| 23:00 | 06:00 | 12.9 | 10.6 | 0 | 2 | NNW | 64 | 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 21 October 2017 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.