Home / Keyes / 21 January 2021
Keyes
United States · 21 January 2021
← 20 January 202122 January 2021 →
Average
11.2°C
low 3.5°C · high 19.6°C
Rainfall
0mm
dry day
Wind
1.5m/s
daily average
Humidity
28.5%
daily average
Cloud
45%
cover
Pressure
1017hPa
daily average
The temperature ranged from 3.5°C around 04:00 to 19.6°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
99th percentile
Low temperature
22th percentile
Rainfall
63th percentile
Wind
40th 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 10.5°C, versus 11.2°C on this specific day.
Sun & daylight
Sunrise
07:14
Sunset
17:16
Day length
10h 2m
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 | 7.2°C | 3.3°C | 0 | 1.6 | W | 38 | 1018 |
| 01:00 | 09:00 | 6.4°C | 2.4°C | 0 | 1.7 | W | 38 | 1019 |
| 02:00 | 10:00 | 5°C | 1.4°C | 0 | 1 | WSW | 38 | 1019 |
| 03:00 | 11:00 | 4.5°C | 1°C | 0 | 0.8 | WSW | 39 | 1019 |
| 04:00 | 12:00 | 3.5°C | -0.1°C | 0 | 0.9 | WSW | 38 | 1018 |
| 05:00 | 13:00 | 3.7°C | 0.1°C | 0 | 0.8 | WSW | 38 | 1018 |
| 06:00 | 14:00 | 4.8°C | 1.4°C | 0 | 0.5 | WSW | 34 | 1019 |
| 07:00 | 15:00 | 6.4°C | 2.7°C | 0 | 0.8 | SW | 27 | 1019 |
| 08:00 | 16:00 | 6.4°C | 2.4°C | 0 | 1.2 | SW | 28 | 1019 |
| 09:00 | 17:00 | 8.9°C | 5.1°C | 0 | 1 | S | 24 | 1019 |
| 10:00 | 18:00 | 12.3°C | 8.8°C | 0 | 1.1 | SSE | 26 | 1019 |
| 11:00 | 19:00 | 14.5°C | 11°C | 0 | 1.3 | SE | 26 | 1019 |
| 12:00 | 20:00 | 16.3°C | 12.7°C | 0 | 1.7 | SE | 26 | 1018 |
| 13:00 | 21:00 | 18.3°C | 14.4°C | 0 | 2 | SE | 22 | 1017 |
| 14:00 | 22:00 | 19°C | 15°C | 0 | 2.2 | ESE | 22 | 1016 |
| 15:00 | 23:00 | 19.6°C | 15.8°C | 0 | 2 | SE | 20 | 1015 |
| 16:00 | 00:00 | 19.5°C | 15.4°C | 0 | 1.7 | ESE | 15 | 1015 |
| 17:00 | 01:00 | 17.3°C | 12.8°C | 0 | 2.2 | E | 15 | 1014 |
| 18:00 | 02:00 | 15.6°C | 11.4°C | 0 | 1.7 | ENE | 17 | 1014 |
| 19:00 | 03:00 | 14.1°C | 10.8°C | 0 | 0.7 | NW | 23 | 1015 |
| 20:00 | 04:00 | 12.8°C | 9°C | 0 | 1.8 | WNW | 31 | 1015 |
| 21:00 | 05:00 | 11°C | 7.1°C | 0 | 2 | W | 33 | 1014 |
| 22:00 | 06:00 | 10.7°C | 6.5°C | 0 | 2.1 | W | 32 | 1015 |
| 23:00 | 07:00 | 10.6°C | 6.6°C | 0 | 1.8 | W | 32 | 1014 |
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
- Keyes — 37.500°, -121.000°, ERA5 grid cell center, 9.8 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- The hourly and daily record for 21 January 2021 specifically — not a monthly average. See the Keyes 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 Keyes, United States (37.50°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 Keyes, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 19, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Keyes, 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 Keyes, 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.