Acton
United States · 8 March 2017
Average
13.9°C
low 7.3°C · high 21.6°C
Rainfall
0mm
dry day
Wind
2.3m/s
daily average
Humidity
50.2%
daily average
Cloud
76%
cover
Pressure
1020hPa
daily average
The temperature ranged from 7.3°C around 03:00 to 21.6°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
91th percentile
Low temperature
70th percentile
Rainfall
44th percentile
Wind
53th 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 9.9°C, versus 13.9°C on this specific day.
Sun & daylight
Sunrise
06:12
Sunset
17:55
Day length
11h 43m
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 | 8.2°C | 5°C | 0 | 2.2 | NNE | 66 | 1022 |
| 01:00 | 09:00 | 7.4°C | 4.1°C | 0 | 2.3 | NNE | 67 | 1022 |
| 02:00 | 10:00 | 7.5°C | 4.1°C | 0 | 2.4 | NNE | 68 | 1022 |
| 03:00 | 11:00 | 7.3°C | 3.9°C | 0 | 2.4 | NNE | 70 | 1022 |
| 04:00 | 12:00 | 7.3°C | 4°C | 0 | 2.4 | NNE | 71 | 1022 |
| 05:00 | 13:00 | 7.8°C | 4.5°C | 0 | 2.4 | NNE | 71 | 1021 |
| 06:00 | 14:00 | 8.2°C | 5.1°C | 0 | 2.5 | NNE | 72 | 1021 |
| 07:00 | 15:00 | 8.3°C | 4.9°C | 0 | 2.6 | NNE | 71 | 1022 |
| 08:00 | 16:00 | 12.5°C | 9.3°C | 0 | 2.8 | NNE | 59 | 1022 |
| 09:00 | 17:00 | 15.7°C | 11.8°C | 0 | 2.8 | NNE | 36 | 1022 |
| 10:00 | 18:00 | 17.7°C | 13.8°C | 0 | 2.9 | NNE | 32 | 1022 |
| 11:00 | 19:00 | 18.7°C | 14.6°C | 0 | 3.2 | NNE | 30 | 1021 |
| 12:00 | 20:00 | 19.4°C | 14.9°C | 0 | 3.5 | NNE | 27 | 1021 |
| 13:00 | 21:00 | 20.6°C | 16.3°C | 0 | 3.2 | NNE | 24 | 1020 |
| 14:00 | 22:00 | 20.9°C | 17.4°C | 0 | 1.6 | NNE | 20 | 1018 |
| 15:00 | 23:00 | 21.5°C | 18.1°C | 0 | 1.5 | NNE | 19 | 1018 |
| 16:00 | 00:00 | 21.6°C | 18°C | 0 | 1.6 | N | 18 | 1018 |
| 17:00 | 01:00 | 20.9°C | 18.3°C | 0 | 1.2 | N | 28 | 1017 |
| 18:00 | 02:00 | 18.1°C | 15.7°C | 0 | 2.1 | N | 46 | 1018 |
| 19:00 | 03:00 | 14.9°C | 12.1°C | 0 | 2.1 | NNE | 49 | 1018 |
| 20:00 | 04:00 | 13.4°C | 11.1°C | 0 | 1.8 | NNE | 57 | 1019 |
| 21:00 | 05:00 | 12.3°C | 10.1°C | 0 | 1.7 | NNE | 63 | 1019 |
| 22:00 | 06:00 | 11.5°C | 9.4°C | 0 | 1.7 | NNE | 70 | 1020 |
| 23:00 | 07:00 | 11.1°C | 9°C | 0 | 1.7 | NNE | 70 | 1020 |
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
- Acton — 34.500°, -118.250°, ERA5 grid cell center, 5.9 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- The hourly and daily record for 8 March 2017 specifically — not a monthly average. See the Acton 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 Acton, United States (34.50°N, 118.25°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Acton, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 21, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Acton, 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 Acton, 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.