Home / Guildhall / 20 December 2017
Guildhall
United States · 20 December 2017
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Average
-4°C
low -10.1°C · high 0.1°C
Rainfall
3mm
rain recorded
Wind
4.5m/s
daily average
Humidity
75.5%
daily average
Cloud
73%
cover
Pressure
1008hPa
daily average
The temperature ranged from -10.1°C around 23:00 to 0.1°C around 00:00. Rain was recorded across 14 hours, from around 00:00 to 14:00 (3mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
64th percentile
Low temperature
56th percentile
Rainfall
76th percentile
Wind
91th 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 -6.3°C, versus -4°C on this specific day.
Sun & daylight
Sunrise
07:18
Sunset
16:08
Day length
8h 50m
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 | 0.1°C | -4.7°C | 0.16 | 3.6 | W | 82 | 1001 |
| 01:00 | 06:00 | -0.2°C | -5.4°C | 0.25 | 4 | W | 83 | 1001 |
| 02:00 | 07:00 | -0.2°C | -5.7°C | 0.24 | 4.4 | W | 83 | 1001 |
| 03:00 | 08:00 | -1.1°C | -6.8°C | 0.16 | 4.5 | W | 80 | 1002 |
| 04:00 | 09:00 | -1.3°C | -6.7°C | 0.07 | 4.1 | W | 81 | 1002 |
| 05:00 | 10:00 | -1.2°C | -7°C | 0.2 | 4.6 | W | 77 | 1002 |
| 06:00 | 11:00 | -2.2°C | -8.2°C | 0.29 | 4.7 | W | 75 | 1003 |
| 07:00 | 12:00 | -2.6°C | -8.7°C | 0.17 | 4.8 | W | 78 | 1004 |
| 08:00 | 13:00 | -2.2°C | -8.3°C | 0.15 | 4.9 | W | 78 | 1005 |
| 09:00 | 14:00 | -2.2°C | -8.1°C | 0.16 | 4.5 | W | 73 | 1005 |
| 10:00 | 15:00 | -2°C | -8.7°C | 0.2 | 5.7 | WNW | 74 | 1006 |
| 11:00 | 16:00 | -2°C | -8.5°C | 0.26 | 5.4 | WNW | 76 | 1007 |
| 12:00 | 17:00 | -2.9°C | -9.5°C | 0.12 | 5.3 | WNW | 72 | 1007 |
| 13:00 | 18:00 | -2.7°C | -8.9°C | 0.12 | 4.9 | WNW | 71 | 1008 |
| 14:00 | 19:00 | -3.3°C | -9.8°C | 0.1 | 5.1 | WNW | 63 | 1008 |
| 15:00 | 20:00 | -5.1°C | -11.8°C | 0.07 | 5.2 | WNW | 65 | 1009 |
| 16:00 | 21:00 | -5.5°C | -12.1°C | 0.05 | 5.1 | WNW | 67 | 1011 |
| 17:00 | 22:00 | -6.8°C | -12.8°C | 0.03 | 4.1 | WNW | 71 | 1012 |
| 18:00 | 23:00 | -7.6°C | -13.5°C | 0.03 | 4 | WNW | 75 | 1013 |
| 19:00 | 00:00 | -7.9°C | -13.7°C | 0.02 | 3.8 | WNW | 77 | 1014 |
| 20:00 | 01:00 | -8.3°C | -14°C | 0.03 | 3.7 | WNW | 77 | 1015 |
| 21:00 | 02:00 | -9.5°C | -15.4°C | 0.03 | 3.7 | WNW | 77 | 1015 |
| 22:00 | 03:00 | -9.8°C | -15.6°C | 0.03 | 3.7 | WNW | 77 | 1016 |
| 23:00 | 04:00 | -10.1°C | -16°C | 0.03 | 3.6 | WNW | 78 | 1017 |
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
- Guildhall — 44.500°, -71.500°, ERA5 grid cell center, 8.6 km from requested point
- Time zone
- America/New_York
- What's shown here
- The hourly and daily record for 20 December 2017 specifically — not a monthly average. See the Guildhall 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 (2026-07-19). Historical climate data for Guildhall, United States (44.50°N, 71.50°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Guildhall, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 19, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Guildhall, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 19, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Guildhall, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-19},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.