Cool
United States · 27 October 2021
← 26 October 202128 October 2021 →
Average
15.5°C
low 11.7°C · high 20.9°C
Rainfall
0mm
dry day
Wind
1.6m/s
daily average
Humidity
70.5%
daily average
Cloud
37%
cover
Pressure
1025hPa
daily average
The temperature ranged from 11.7°C around 06:00 to 20.9°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
30th percentile
Low temperature
84th percentile
Rainfall
79th percentile
Wind
19th 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 14.9°C, versus 15.5°C on this specific day.
Sun & daylight
Sunrise
07:26
Sunset
18:08
Day length
10h 42m
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 | 07:00 | 12.7°C | 12.1°C | 0 | 0.5 | ENE | 76 | 1025 |
| 01:00 | 08:00 | 12.6°C | 12°C | 0 | 0.4 | ENE | 77 | 1026 |
| 02:00 | 09:00 | 12.2°C | 11.5°C | 0 | 0.4 | E | 77 | 1026 |
| 03:00 | 10:00 | 13.7°C | 12.6°C | 0 | 1.2 | ENE | 73 | 1026 |
| 04:00 | 11:00 | 12.3°C | 11.5°C | 0.01 | 0.9 | ENE | 82 | 1025 |
| 05:00 | 12:00 | 12.1°C | 11.3°C | 0 | 0.7 | E | 80 | 1026 |
| 06:00 | 13:00 | 11.7°C | 11°C | 0 | 0.5 | E | 82 | 1026 |
| 07:00 | 14:00 | 11.9°C | 11.2°C | 0 | 0.4 | E | 81 | 1026 |
| 08:00 | 15:00 | 12°C | 11.3°C | 0 | 0.5 | ENE | 79 | 1027 |
| 09:00 | 16:00 | 13.7°C | 13.3°C | 0 | 0.4 | NE | 75 | 1027 |
| 10:00 | 17:00 | 15.3°C | 14.4°C | 0 | 0.6 | NW | 62 | 1027 |
| 11:00 | 18:00 | 17.4°C | 15.9°C | 0 | 1.2 | WNW | 51 | 1027 |
| 12:00 | 19:00 | 19°C | 17.3°C | 0 | 2 | WNW | 51 | 1027 |
| 13:00 | 20:00 | 19.6°C | 17.8°C | 0 | 2.6 | WNW | 53 | 1026 |
| 14:00 | 21:00 | 20.3°C | 18.4°C | 0 | 3.1 | WNW | 55 | 1025 |
| 15:00 | 22:00 | 20.9°C | 18.9°C | 0 | 3.7 | WNW | 56 | 1025 |
| 16:00 | 23:00 | 20.5°C | 19°C | 0 | 3.1 | NW | 59 | 1025 |
| 17:00 | 00:00 | 20°C | 18.9°C | 0 | 2.5 | NW | 62 | 1024 |
| 18:00 | 01:00 | 19°C | 18°C | 0 | 2.6 | NW | 66 | 1024 |
| 19:00 | 02:00 | 17.7°C | 17°C | 0 | 2.2 | NNW | 73 | 1024 |
| 20:00 | 03:00 | 15.3°C | 14.6°C | 0 | 2.1 | NNE | 82 | 1024 |
| 21:00 | 04:00 | 14.6°C | 13.6°C | 0 | 2.2 | NE | 83 | 1023 |
| 22:00 | 05:00 | 14.1°C | 12.8°C | 0 | 2.4 | NE | 81 | 1023 |
| 23:00 | 06:00 | 13.9°C | 12.1°C | 0 | 2.7 | NE | 77 | 1022 |
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
- Cool — 39.000°, -121.000°, ERA5 grid cell center, 12.6 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- The hourly and daily record for 27 October 2021 specifically — not a monthly average. See the Cool 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 Cool, United States (39.00°N, 121.00°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Cool, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 21, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Cool, 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 Cool, 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.