Home / Grantham / 18 December 2018
Grantham
United States · 18 December 2018
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Average
-7°C
low -8.7°C · high -3°C
Rainfall
0.3mm
dry day
Wind
6.3m/s
daily average
Humidity
61.9%
daily average
Cloud
75%
cover
Pressure
1013hPa
daily average
The temperature ranged from -8.7°C around 23:00 to -3°C around 00:00. 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
28th percentile
Low temperature
44th percentile
Rainfall
50th percentile
Wind
99th 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 -3.7°C, versus -7°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 | -3°C | -10.7°C | 0.08 | 6.8 | NW | 66 | 1004 |
| 01:00 | 06:00 | -4.8°C | -13°C | 0.05 | 7.2 | NW | 64 | 1005 |
| 02:00 | 07:00 | -5.8°C | -14.1°C | 0.04 | 7.3 | NW | 64 | 1006 |
| 03:00 | 08:00 | -7.1°C | -15.5°C | 0.03 | 7.3 | NW | 60 | 1008 |
| 04:00 | 09:00 | -7.8°C | -16.3°C | 0.02 | 7.3 | NW | 60 | 1009 |
| 05:00 | 10:00 | -8.3°C | -16.6°C | 0.02 | 7 | NW | 59 | 1010 |
| 06:00 | 11:00 | -8.3°C | -16.8°C | 0.01 | 7.4 | NW | 60 | 1011 |
| 07:00 | 12:00 | -8.4°C | -16.7°C | 0.01 | 7.2 | NW | 63 | 1012 |
| 08:00 | 13:00 | -8.5°C | -16.7°C | 0 | 7.1 | NW | 64 | 1013 |
| 09:00 | 14:00 | -7.9°C | -16.1°C | 0 | 7 | NW | 62 | 1014 |
| 10:00 | 15:00 | -7.1°C | -15.5°C | 0.01 | 7.2 | NW | 58 | 1015 |
| 11:00 | 16:00 | -6.9°C | -15.3°C | 0 | 7.3 | NW | 57 | 1015 |
| 12:00 | 17:00 | -5.9°C | -14.3°C | 0 | 7.3 | NW | 55 | 1014 |
| 13:00 | 18:00 | -5.8°C | -14.1°C | 0 | 7.2 | NW | 55 | 1014 |
| 14:00 | 19:00 | -5.5°C | -13.8°C | 0 | 7.1 | NW | 54 | 1015 |
| 15:00 | 20:00 | -5.6°C | -13.7°C | 0 | 6.8 | NW | 55 | 1015 |
| 16:00 | 21:00 | -5.9°C | -13.1°C | 0 | 5.6 | NW | 56 | 1016 |
| 17:00 | 22:00 | -7°C | -13.6°C | 0 | 4.9 | NW | 62 | 1017 |
| 18:00 | 23:00 | -7.3°C | -13.9°C | 0 | 4.8 | NW | 65 | 1017 |
| 19:00 | 00:00 | -7.6°C | -14°C | 0 | 4.5 | WNW | 66 | 1018 |
| 20:00 | 01:00 | -7.9°C | -14.2°C | 0 | 4.4 | WNW | 67 | 1019 |
| 21:00 | 02:00 | -8.4°C | -14.5°C | 0 | 4.2 | WNW | 70 | 1019 |
| 22:00 | 03:00 | -8.5°C | -14.4°C | 0 | 3.8 | WNW | 71 | 1019 |
| 23:00 | 04:00 | -8.7°C | -14.6°C | 0 | 3.7 | WNW | 72 | 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
- 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 2018 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.