Home / Cornwall / 3 September 2017
Cornwall
United States · 3 September 2017
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Average
17.6°C
low 14.4° · high 22.5°
Rainfall
3.6mm
rain recorded
Wind
2.6m/s
daily average
Humidity
82%
daily average
Cloud
71%
cover
Pressure
1014hPa
daily average
The temperature ranged from 14.4°C around 01:00 to 22.5°C around 17:00. Rain was recorded across 11 hours, from around 00:00 to 12:00 (3.6mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
6th percentile
Low temperature
17th percentile
Rainfall
78th percentile
Wind
67th 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 22.6°C, versus 17.6°C on this specific day.
Sun & daylight
Sunrise
06:35
Sunset
19:34
Day length
12h 58m
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 | 04:00 | 14.5 | 13 | 0.18 | 4 | E | 96 | 1016 |
| 01:00 | 05:00 | 14.4 | 13.3 | 0.18 | 3.4 | E | 97 | 1016 |
| 02:00 | 06:00 | 14.6 | 14.6 | 0.36 | 1.9 | ESE | 97 | 1015 |
| 03:00 | 07:00 | 14.8 | 15.9 | 0.72 | 0.3 | SE | 97 | 1015 |
| 04:00 | 08:00 | 15 | 16.1 | 0.72 | 0.6 | WNW | 98 | 1014 |
| 05:00 | 09:00 | 14.7 | 15.5 | 0.26 | 1 | NW | 100 | 1014 |
| 06:00 | 10:00 | 15 | 15.6 | 0.18 | 1.5 | WNW | 99 | 1014 |
| 07:00 | 11:00 | 15.1 | 16 | 0.14 | 1 | NW | 99 | 1014 |
| 08:00 | 12:00 | 15.1 | 15.9 | 0.24 | 1 | WNW | 99 | 1014 |
| 09:00 | 13:00 | 15.4 | 16 | 0.12 | 1.4 | W | 98 | 1014 |
| 10:00 | 14:00 | 15.6 | 16 | 0.04 | 1.8 | W | 97 | 1014 |
| 11:00 | 15:00 | 17.3 | 17 | 0.02 | 2.2 | WSW | 82 | 1014 |
| 12:00 | 16:00 | 18.4 | 18.2 | 0.25 | 2.6 | WSW | 81 | 1014 |
| 13:00 | 17:00 | 19.6 | 19.3 | 0.07 | 2.9 | W | 76 | 1013 |
| 14:00 | 18:00 | 20.9 | 20.3 | 0.03 | 3.3 | W | 70 | 1013 |
| 15:00 | 19:00 | 21.3 | 20.3 | 0.04 | 3.5 | W | 65 | 1013 |
| 16:00 | 20:00 | 22.1 | 20.2 | 0.01 | 4.1 | W | 57 | 1013 |
| 17:00 | 21:00 | 22.5 | 20.2 | 0.02 | 4.7 | W | 55 | 1013 |
| 18:00 | 22:00 | 21.7 | 19.9 | 0.01 | 4.5 | W | 63 | 1013 |
| 19:00 | 23:00 | 21.2 | 19.6 | 0 | 4 | W | 62 | 1013 |
| 20:00 | 00:00 | 19.7 | 18.2 | 0 | 3.3 | W | 65 | 1014 |
| 21:00 | 01:00 | 18.6 | 17.3 | 0 | 3 | W | 68 | 1014 |
| 22:00 | 02:00 | 18.2 | 17.1 | 0 | 2.9 | W | 70 | 1015 |
| 23:00 | 03:00 | 17.2 | 16.3 | 0 | 2.8 | W | 79 | 1015 |
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
- Cornwall — 40.250°, -76.500°, ERA5 grid cell center, 8.4 km from requested point
- Time zone
- America/New_York
- What's shown here
- The hourly and daily record for 3 September 2017 specifically — not a monthly average. See the Cornwall 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 (2026-07-18). Historical climate data for Cornwall, United States (40.25°N, 76.50°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Cornwall, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 18, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Cornwall, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 18, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Cornwall, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-18},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.