Home / Walnut / 30 January 2018
Walnut
United States · 30 January 2018
← 29 January 201831 January 2018 →
Average
17.9°C
low 12.8°C · high 26°C
Rainfall
0mm
dry day
Wind
1.4m/s
daily average
Humidity
21.7%
daily average
Cloud
79%
cover
Pressure
1017hPa
daily average
The temperature ranged from 12.8°C around 23:00 to 26°C around 14:00. 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
100th percentile
Rainfall
68th percentile
Wind
44th 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 11.6°C, versus 17.9°C on this specific day.
Sun & daylight
Sunrise
06:49
Sunset
17:19
Day length
10h 30m
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 | 16.3°C | 12°C | 0 | 2.2 | NE | 21 | 1019 |
| 01:00 | 09:00 | 15.2°C | 11°C | 0 | 2.1 | NE | 22 | 1019 |
| 02:00 | 10:00 | 15.2°C | 10.9°C | 0 | 2.3 | NNE | 22 | 1018 |
| 03:00 | 11:00 | 14.2°C | 10°C | 0 | 2.2 | NE | 26 | 1018 |
| 04:00 | 12:00 | 13.2°C | 9°C | 0 | 2.2 | NE | 27 | 1017 |
| 05:00 | 13:00 | 13.2°C | 8.9°C | 0 | 2.2 | NE | 25 | 1017 |
| 06:00 | 14:00 | 13°C | 8.7°C | 0 | 2.2 | NE | 26 | 1018 |
| 07:00 | 15:00 | 13.1°C | 8.7°C | 0 | 2.1 | NE | 21 | 1018 |
| 08:00 | 16:00 | 14.1°C | 9.7°C | 0 | 2.3 | NE | 21 | 1019 |
| 09:00 | 17:00 | 17.3°C | 13.2°C | 0 | 2.1 | NE | 21 | 1019 |
| 10:00 | 18:00 | 20.1°C | 16.5°C | 0 | 1.5 | ENE | 19 | 1019 |
| 11:00 | 19:00 | 22.6°C | 19.3°C | 0 | 1.2 | ENE | 17 | 1018 |
| 12:00 | 20:00 | 24.3°C | 21°C | 0 | 0.9 | ESE | 13 | 1017 |
| 13:00 | 21:00 | 25.4°C | 22.1°C | 0 | 0.8 | S | 11 | 1016 |
| 14:00 | 22:00 | 26°C | 23°C | 0 | 0.4 | SSW | 11 | 1015 |
| 15:00 | 23:00 | 25.8°C | 22.3°C | 0 | 1 | SW | 12 | 1015 |
| 16:00 | 00:00 | 24.9°C | 21.3°C | 0 | 1.1 | SW | 11 | 1015 |
| 17:00 | 01:00 | 22.3°C | 18.8°C | 0 | 1.3 | SW | 16 | 1015 |
| 18:00 | 02:00 | 20.8°C | 17.7°C | 0 | 0.5 | SSW | 16 | 1015 |
| 19:00 | 03:00 | 16.4°C | 13.7°C | 0 | 0.5 | NNE | 27 | 1015 |
| 20:00 | 04:00 | 15.2°C | 12.6°C | 0 | 0.4 | N | 29 | 1015 |
| 21:00 | 05:00 | 14.2°C | 11.7°C | 0 | 0.6 | NNE | 34 | 1015 |
| 22:00 | 06:00 | 13.7°C | 11°C | 0 | 0.7 | NNE | 35 | 1015 |
| 23:00 | 07:00 | 12.8°C | 9.9°C | 0 | 0.9 | NE | 35 | 1016 |
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 30 January 2018 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 (2026-07-19). 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 19, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Walnut, 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 Walnut, 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.