Home / Walnut / 31 January 2021
Walnut
United States · 31 January 2021
← 30 January 20211 February 2021 →
Average
12.5°C
low 5.7°C · high 19.1°C
Rainfall
0mm
dry day
Wind
1.9m/s
daily average
Humidity
48.4%
daily average
Cloud
80%
cover
Pressure
1020hPa
daily average
The temperature ranged from 5.7°C around 04:00 to 19.1°C around 13:00. 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
54th percentile
Low temperature
25th percentile
Rainfall
71th 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 12.2°C, versus 12.5°C on this specific day.
Sun & daylight
Sunrise
06:48
Sunset
17:20
Day length
10h 33m
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 | 8.6°C | 5.8°C | 0 | 1.8 | NNE | 66 | 1022 |
| 01:00 | 09:00 | 7.7°C | 4.6°C | 0 | 2 | NNE | 67 | 1022 |
| 02:00 | 10:00 | 6.4°C | 3.3°C | 0 | 1.9 | NNE | 71 | 1022 |
| 03:00 | 11:00 | 6.2°C | 2.9°C | 0 | 2.1 | NNE | 69 | 1022 |
| 04:00 | 12:00 | 5.7°C | 2.2°C | 0 | 2.1 | NNE | 67 | 1021 |
| 05:00 | 13:00 | 6.4°C | 2.7°C | 0 | 2.4 | NE | 64 | 1021 |
| 06:00 | 14:00 | 6.6°C | 3°C | 0 | 2.4 | NE | 64 | 1021 |
| 07:00 | 15:00 | 6.9°C | 3.2°C | 0 | 2.4 | NE | 61 | 1022 |
| 08:00 | 16:00 | 8.1°C | 4.2°C | 0 | 2.8 | NE | 58 | 1022 |
| 09:00 | 17:00 | 11.5°C | 7.9°C | 0 | 2.4 | NE | 46 | 1022 |
| 10:00 | 18:00 | 13.9°C | 10.4°C | 0 | 2.2 | NE | 39 | 1022 |
| 11:00 | 19:00 | 15.9°C | 12.2°C | 0 | 2.3 | NE | 33 | 1021 |
| 12:00 | 20:00 | 17.6°C | 14.1°C | 0 | 2 | NE | 30 | 1020 |
| 13:00 | 21:00 | 19.1°C | 15.6°C | 0 | 1.7 | NE | 24 | 1019 |
| 14:00 | 22:00 | 18.7°C | 15.7°C | 0 | 1.7 | NE | 30 | 1019 |
| 15:00 | 23:00 | 18.7°C | 15.8°C | 0 | 1.4 | NE | 29 | 1019 |
| 16:00 | 00:00 | 17.9°C | 15.1°C | 0 | 1.2 | NNE | 29 | 1019 |
| 17:00 | 01:00 | 17°C | 15°C | 0 | 0.7 | NNW | 39 | 1019 |
| 18:00 | 02:00 | 16.1°C | 14°C | 0 | 0.8 | NNE | 42 | 1019 |
| 19:00 | 03:00 | 14.6°C | 12.2°C | 0 | 1.1 | NNE | 42 | 1019 |
| 20:00 | 04:00 | 14.1°C | 11.8°C | 0 | 1.5 | NNE | 51 | 1020 |
| 21:00 | 05:00 | 14.4°C | 11.6°C | 0 | 1.8 | NNE | 45 | 1020 |
| 22:00 | 06:00 | 14.2°C | 11.2°C | 0 | 2.2 | NE | 46 | 1019 |
| 23:00 | 07:00 | 13.6°C | 10.6°C | 0 | 2.2 | NE | 51 | 1019 |
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
- Walnut — 34.000°, -117.750°, ERA5 grid cell center, 10.9 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- The hourly and daily record for 31 January 2021 specifically — not a monthly average. See the Walnut 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 (2026-07-20). Historical climate data for Walnut, United States (34.00°N, 117.75°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Walnut, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 20, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Walnut, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 20, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Walnut, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-20},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.