Home / Foster / 17 December 2021
Foster
United States · 17 December 2021
← 16 December 202118 December 2021 →
Average
11.8°C
low 5.8°C · high 15.5°C
Rainfall
0.4mm
dry day
Wind
4.6m/s
daily average
Humidity
40.8%
daily average
Cloud
42%
cover
Pressure
1015hPa
daily average
The temperature ranged from 5.8°C around 23:00 to 15.5°C around 13:00. Rain was recorded for one hour, around 03:00 (0.4mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
97th percentile
Low temperature
97th percentile
Rainfall
58th percentile
Wind
77th 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 0.7°C, versus 11.8°C on this specific day.
Sun & daylight
Sunrise
07:08
Sunset
16:17
Day length
9h 9m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/New_York.
Cumulative rainfall through the day.
| Local time | UTC | Temp | Feels | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 05:00 | 12°C | 7.3°C | 0 | 5.7 | SW | 69 | 1010 |
| 01:00 | 06:00 | 12.2°C | 7.4°C | 0.01 | 5.6 | SW | 67 | 1010 |
| 02:00 | 07:00 | 11.8°C | 7.1°C | 0.07 | 5.6 | SW | 71 | 1010 |
| 03:00 | 08:00 | 11.7°C | 7.1°C | 0.31 | 5.7 | WSW | 73 | 1009 |
| 04:00 | 09:00 | 11.7°C | 7°C | 0.02 | 5.9 | WSW | 75 | 1009 |
| 05:00 | 10:00 | 12°C | 7.2°C | 0 | 5.7 | WSW | 70 | 1010 |
| 06:00 | 11:00 | 12.6°C | 8.1°C | 0 | 5.3 | WSW | 68 | 1011 |
| 07:00 | 12:00 | 13.1°C | 9.1°C | 0 | 4.8 | W | 68 | 1013 |
| 08:00 | 13:00 | 13.2°C | 8.4°C | 0 | 5 | WNW | 55 | 1014 |
| 09:00 | 14:00 | 13.4°C | 7.5°C | 0 | 5.1 | WNW | 34 | 1015 |
| 10:00 | 15:00 | 14°C | 7.3°C | 0 | 5.3 | WNW | 19 | 1016 |
| 11:00 | 16:00 | 14.6°C | 8°C | 0 | 5.2 | WNW | 20 | 1015 |
| 12:00 | 17:00 | 15.2°C | 8.7°C | 0 | 5 | WNW | 17 | 1015 |
| 13:00 | 18:00 | 15.5°C | 9.2°C | 0 | 4.6 | W | 15 | 1015 |
| 14:00 | 19:00 | 15.4°C | 9.3°C | 0 | 4.2 | W | 16 | 1015 |
| 15:00 | 20:00 | 14.6°C | 8.8°C | 0 | 3.9 | W | 18 | 1015 |
| 16:00 | 21:00 | 12.9°C | 7.3°C | 0 | 3.8 | W | 21 | 1016 |
| 17:00 | 22:00 | 10.9°C | 5.3°C | 0 | 3.6 | WNW | 22 | 1017 |
| 18:00 | 23:00 | 9.8°C | 4.3°C | 0 | 3.5 | W | 24 | 1018 |
| 19:00 | 00:00 | 9.1°C | 3.6°C | 0 | 3.6 | W | 26 | 1018 |
| 20:00 | 01:00 | 8.5°C | 2.9°C | 0 | 3.6 | WNW | 26 | 1019 |
| 21:00 | 02:00 | 7.9°C | 2.5°C | 0 | 3.5 | WNW | 30 | 1020 |
| 22:00 | 03:00 | 6.5°C | 1.2°C | 0 | 3.5 | WNW | 36 | 1021 |
| 23:00 | 04:00 | 5.8°C | 0.7°C | 0 | 3.3 | WNW | 39 | 1021 |
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
- Foster — 41.750°, -71.750°, ERA5 grid cell center, 11.6 km from requested point
- Time zone
- America/New_York
- What's shown here
- The hourly and daily record for 17 December 2021 specifically — not a monthly average. See the Foster 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 Foster, United States (41.75°N, 71.75°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Foster, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 21, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Foster, 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 Foster, 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.