Altamont
United States · 25 May 2022
Average
17.9°C
low 7.6° · high 28°
Rainfall
0mm
dry day
Wind
1.8m/s
daily average
Humidity
44.2%
daily average
Cloud
46%
cover
Pressure
1013hPa
daily average
The temperature ranged from 7.6°C around 04:00 to 28°C around 16:00. 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
90th percentile
Low temperature
61th percentile
Rainfall
55th percentile
Wind
25th 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 13.7°C, versus 17.9°C on this specific day.
Sun & daylight
Sunrise
05:37
Sunset
20:31
Day length
14h 54m
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 | 12.2 | 10.8 | 0 | 1 | WNW | 72 | 1016 |
| 01:00 | 08:00 | 11.7 | 10.5 | 0 | 1 | WNW | 77 | 1015 |
| 02:00 | 09:00 | 10 | 8.6 | 0 | 1 | WNW | 82 | 1016 |
| 03:00 | 10:00 | 8.1 | 6.6 | 0 | 0.8 | WNW | 88 | 1015 |
| 04:00 | 11:00 | 7.6 | 6 | 0 | 0.9 | WNW | 89 | 1015 |
| 05:00 | 12:00 | 7.8 | 6.2 | 0 | 1.1 | WNW | 89 | 1016 |
| 06:00 | 13:00 | 8.2 | 6.8 | 0 | 0.7 | WNW | 88 | 1016 |
| 07:00 | 14:00 | 9.9 | 8.9 | 0 | 0.3 | NW | 81 | 1016 |
| 08:00 | 15:00 | 14.9 | 13.8 | 0 | 0.3 | SSW | 56 | 1017 |
| 09:00 | 16:00 | 18.4 | 16.7 | 0 | 0.7 | S | 41 | 1016 |
| 10:00 | 17:00 | 20.8 | 18.3 | 0 | 0.9 | SW | 27 | 1015 |
| 11:00 | 18:00 | 22.3 | 19.4 | 0 | 1.1 | WSW | 21 | 1014 |
| 12:00 | 19:00 | 23.4 | 20 | 0 | 1.4 | W | 18 | 1013 |
| 13:00 | 20:00 | 25.1 | 21.2 | 0 | 1.9 | W | 14 | 1012 |
| 14:00 | 21:00 | 26.3 | 21.9 | 0 | 2.4 | W | 12 | 1011 |
| 15:00 | 22:00 | 27.8 | 23.2 | 0 | 2.6 | W | 10 | 1011 |
| 16:00 | 23:00 | 28 | 22.8 | 0 | 3.4 | WNW | 10 | 1010 |
| 17:00 | 00:00 | 27 | 21.8 | 0 | 4 | WNW | 13 | 1010 |
| 18:00 | 01:00 | 26.6 | 20.9 | 0 | 4.4 | NW | 12 | 1010 |
| 19:00 | 02:00 | 24.9 | 19.4 | 0 | 3.9 | NW | 12 | 1010 |
| 20:00 | 03:00 | 20.6 | 16.7 | 0 | 2.8 | NNW | 26 | 1010 |
| 21:00 | 04:00 | 16.7 | 13.3 | 0 | 2.1 | NNW | 33 | 1011 |
| 22:00 | 05:00 | 16.1 | 13.2 | 0 | 1.9 | NNW | 42 | 1012 |
| 23:00 | 06:00 | 14.2 | 11.5 | 0 | 1.9 | NW | 49 | 1012 |
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
- Altamont — 42.250°, -121.750°, ERA5 grid cell center, 4.9 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- The hourly and daily record for 25 May 2022 specifically — not a monthly average. See the Altamont 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 (2026-07-16). Historical climate data for Altamont, United States (42.25°N, 121.75°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Altamont, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 16, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Altamont, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 16, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Altamont, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-16},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.