Home / Grantham / 18 December 2021
Grantham
United States · 18 December 2021
← 17 December 202119 December 2021 →
Average
-1.2°C
low -3.2°C · high 1.2°C
Rainfall
12.6mm
rain recorded
Wind
2.4m/s
daily average
Humidity
73.8%
daily average
Cloud
98%
cover
Pressure
1020hPa
daily average
The temperature ranged from -3.2°C around 23:00 to 1.2°C around 00:00. Rain was recorded across 12 hours, from around 12:00 to 23:00 (12.6mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
61th percentile
Low temperature
77th percentile
Rainfall
92th percentile
Wind
27th 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 -3.9°C, versus -1.2°C on this specific day.
Sun & daylight
Sunrise
07:17
Sunset
16:14
Day length
8h 57m
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 | 1.2°C | -4.4°C | 0 | 4.1 | NW | 58 | 1022 |
| 01:00 | 06:00 | 1°C | -4.3°C | 0 | 3.6 | NW | 55 | 1022 |
| 02:00 | 07:00 | 1°C | -4°C | 0 | 3.1 | NW | 54 | 1023 |
| 03:00 | 08:00 | -0.1°C | -5.1°C | 0 | 3 | NW | 55 | 1024 |
| 04:00 | 09:00 | -0.3°C | -5.3°C | 0 | 3.1 | NNW | 58 | 1024 |
| 05:00 | 10:00 | -1.4°C | -6.3°C | 0 | 2.9 | NNW | 62 | 1024 |
| 06:00 | 11:00 | -1.3°C | -6°C | 0 | 2.6 | NNW | 63 | 1024 |
| 07:00 | 12:00 | -1.4°C | -5.9°C | 0 | 2.4 | NNW | 63 | 1024 |
| 08:00 | 13:00 | -0.9°C | -4.9°C | 0 | 1.6 | N | 63 | 1024 |
| 09:00 | 14:00 | -0.5°C | -4.1°C | 0.02 | 1.1 | N | 59 | 1024 |
| 10:00 | 15:00 | -0.3°C | -3.6°C | 0.03 | 0.7 | NE | 59 | 1023 |
| 11:00 | 16:00 | -0.3°C | -3.6°C | 0.05 | 0.8 | ENE | 60 | 1022 |
| 12:00 | 17:00 | -0.6°C | -4°C | 0.12 | 1 | E | 66 | 1021 |
| 13:00 | 18:00 | -1.1°C | -4.8°C | 0.32 | 1.4 | ESE | 73 | 1021 |
| 14:00 | 19:00 | -1.3°C | -5.5°C | 0.89 | 2.4 | ESE | 77 | 1020 |
| 15:00 | 20:00 | -2.2°C | -6.6°C | 1.16 | 2.6 | ESE | 87 | 1019 |
| 16:00 | 21:00 | -2.2°C | -6.5°C | 1.34 | 2.6 | ESE | 90 | 1019 |
| 17:00 | 22:00 | -2.3°C | -6.5°C | 1.41 | 2.6 | ESE | 95 | 1018 |
| 18:00 | 23:00 | -2.2°C | -6.4°C | 1.32 | 2.6 | ESE | 96 | 1017 |
| 19:00 | 00:00 | -2.4°C | -6.7°C | 1.08 | 2.8 | ESE | 97 | 1016 |
| 20:00 | 01:00 | -2.4°C | -6.9°C | 1.08 | 2.9 | ESE | 97 | 1015 |
| 21:00 | 02:00 | -2.5°C | -7.3°C | 1.1 | 3.4 | ESE | 96 | 1014 |
| 22:00 | 03:00 | -3°C | -7.6°C | 1.2 | 3.1 | ESE | 96 | 1014 |
| 23:00 | 04:00 | -3.2°C | -7.1°C | 1.49 | 2.1 | E | 95 | 1014 |
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
- Grantham — 43.500°, -72.250°, ERA5 grid cell center, 9.1 km from requested point
- Time zone
- America/New_York
- What's shown here
- The hourly and daily record for 18 December 2021 specifically — not a monthly average. See the Grantham 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 Grantham, United States (43.50°N, 72.25°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Grantham, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 21, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Grantham, 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 Grantham, 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.