Home / Acton / 11 December 2021
Acton
United States · 11 December 2021
← 10 December 202112 December 2021 →
Average
4.1°C
low -3.7° · high 14.3°
Rainfall
15.4mm
rain recorded
Wind
3.2m/s
daily average
Humidity
93%
daily average
Cloud
96%
cover
Pressure
1008hPa
daily average
The temperature ranged from -3.7°C around 01:00 to 14.3°C around 23:00. Rain was recorded across 10 hours, from around 08:00 to 23:00 (15.4mm total).
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
64th percentile
Rainfall
90th percentile
Wind
58th 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 -2.1°C, versus 4.1°C on this specific day.
Sun & daylight
Sunrise
07:07
Sunset
16:07
Day length
9h 1m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/New_York.
Cumulative rainfall through the day.
| Local time | UTC | Temp °C | Feels °C | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 05:00 | -3.5 | -6.8 | 0 | 1 | N | 88 | 1022 |
| 01:00 | 06:00 | -3.7 | -7.1 | 0 | 1.2 | NNE | 90 | 1021 |
| 02:00 | 07:00 | -2.9 | -6.3 | 0 | 1.2 | N | 88 | 1021 |
| 03:00 | 08:00 | -2.2 | -5.4 | 0 | 1 | NNE | 87 | 1021 |
| 04:00 | 09:00 | -2.6 | -6.1 | 0 | 1.3 | NE | 88 | 1019 |
| 05:00 | 10:00 | -2 | -5.4 | 0 | 1.3 | NE | 89 | 1019 |
| 06:00 | 11:00 | -1.8 | -5.5 | 0 | 1.8 | NE | 90 | 1018 |
| 07:00 | 12:00 | -2 | -5.6 | 0.01 | 1.8 | NE | 91 | 1017 |
| 08:00 | 13:00 | -2.3 | -6.4 | 0.69 | 2.4 | NE | 93 | 1016 |
| 09:00 | 14:00 | -1.1 | -5.1 | 1.24 | 2.5 | ENE | 97 | 1013 |
| 10:00 | 15:00 | -0.4 | -3.7 | 2.44 | 1.8 | ENE | 98 | 1012 |
| 11:00 | 16:00 | 0.4 | -2.6 | 2.53 | 1.4 | NNE | 98 | 1009 |
| 12:00 | 17:00 | 2.1 | -0.2 | 2.81 | 0.8 | N | 97 | 1007 |
| 13:00 | 18:00 | 3.4 | 1 | 1.82 | 1.2 | SSW | 97 | 1004 |
| 14:00 | 19:00 | 6.3 | 3 | 0.01 | 3.2 | SSW | 96 | 1002 |
| 15:00 | 20:00 | 10.9 | 7.7 | 0.02 | 4.8 | SSW | 97 | 1001 |
| 16:00 | 21:00 | 11.6 | 8 | 0.05 | 5.6 | SSW | 96 | 1000 |
| 17:00 | 22:00 | 11.2 | 8.2 | 0.05 | 4.5 | SSW | 96 | 1000 |
| 18:00 | 23:00 | 11.9 | 8.3 | 0.47 | 5.5 | SSW | 96 | 999 |
| 19:00 | 00:00 | 11.9 | 8.1 | 0.09 | 5.9 | SSW | 95 | 997 |
| 20:00 | 01:00 | 12.2 | 8.3 | 0.01 | 6.1 | SSW | 95 | 997 |
| 21:00 | 02:00 | 13 | 9 | 0.18 | 6.3 | SSW | 92 | 995 |
| 22:00 | 03:00 | 13.9 | 9.7 | 0.28 | 7.1 | SSW | 91 | 994 |
| 23:00 | 04:00 | 14.3 | 9.9 | 2.72 | 7.7 | SW | 92 | 993 |
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 — 43.500°, -71.000°, ERA5 grid cell center, 8.2 km from requested point
- Time zone
- America/New_York
- What's shown here
- The hourly and daily record for 11 December 2021 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 (2026-07-16). Historical climate data for Acton, United States (43.50°N, 71.00°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Acton, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 16, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Acton, 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 Acton, 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.