Home / Cornwall / 7 September 2021
Cornwall
United States · 7 September 2021
← 6 September 20218 September 2021 →
Average
21.7°C
low 14.6°C · high 28.1°C
Rainfall
0mm
dry day
Wind
2m/s
daily average
Humidity
65.4%
daily average
Cloud
24%
cover
Pressure
1014hPa
daily average
The temperature ranged from 14.6°C around 07:00 to 28.1°C around 17:00. 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
67th percentile
Low temperature
27th percentile
Rainfall
51th percentile
Wind
39th 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 21.6°C, versus 21.7°C on this specific day.
Sun & daylight
Sunrise
06:39
Sunset
19:27
Day length
12h 48m
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 | 04:00 | 18.8°C | 18.9°C | 0 | 1.7 | NW | 75 | 1014 |
| 01:00 | 05:00 | 18°C | 18.1°C | 0 | 1.6 | NW | 78 | 1014 |
| 02:00 | 06:00 | 17.5°C | 17.5°C | 0 | 1.6 | NW | 78 | 1014 |
| 03:00 | 07:00 | 17°C | 16.8°C | 0 | 1.8 | NNW | 79 | 1014 |
| 04:00 | 08:00 | 16.2°C | 15.8°C | 0 | 1.9 | NNW | 80 | 1014 |
| 05:00 | 09:00 | 15.4°C | 15°C | 0 | 1.5 | NNW | 81 | 1015 |
| 06:00 | 10:00 | 14.9°C | 14.7°C | 0 | 1.4 | N | 86 | 1015 |
| 07:00 | 11:00 | 14.6°C | 14.9°C | 0 | 0.6 | NNE | 86 | 1015 |
| 08:00 | 12:00 | 16.5°C | 17.6°C | 0 | 0.1 | E | 83 | 1016 |
| 09:00 | 13:00 | 18.7°C | 19.6°C | 0 | 0.4 | SSE | 73 | 1016 |
| 10:00 | 14:00 | 21.1°C | 21.5°C | 0 | 0.9 | SSE | 61 | 1016 |
| 11:00 | 15:00 | 23.9°C | 24.1°C | 0 | 1.3 | SSW | 52 | 1016 |
| 12:00 | 16:00 | 25.1°C | 25.3°C | 0 | 1.6 | SSW | 51 | 1016 |
| 13:00 | 17:00 | 26.3°C | 26.5°C | 0 | 2 | SW | 50 | 1015 |
| 14:00 | 18:00 | 27°C | 26.4°C | 0 | 3 | WSW | 46 | 1015 |
| 15:00 | 19:00 | 27.1°C | 26.4°C | 0 | 3.1 | WSW | 46 | 1014 |
| 16:00 | 20:00 | 27.7°C | 27.4°C | 0 | 2.5 | SW | 45 | 1013 |
| 17:00 | 21:00 | 28.1°C | 28.1°C | 0 | 2.1 | SSW | 44 | 1013 |
| 18:00 | 22:00 | 27.1°C | 27.6°C | 0 | 2.1 | S | 51 | 1012 |
| 19:00 | 23:00 | 25.9°C | 26.4°C | 0 | 2.4 | SSE | 56 | 1012 |
| 20:00 | 00:00 | 24.4°C | 24.5°C | 0 | 3.1 | SSE | 63 | 1012 |
| 21:00 | 01:00 | 23.5°C | 23.3°C | 0 | 3.6 | SSE | 67 | 1013 |
| 22:00 | 02:00 | 23.2°C | 22.7°C | 0 | 4 | S | 68 | 1013 |
| 23:00 | 03:00 | 22.1°C | 21.2°C | 0 | 4.4 | SSW | 71 | 1013 |
Nearby cities
Need this verified for an official or legal purpose? Request a weather verification report.
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 7 September 2021 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 (2026-07-20). 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 20, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Cornwall, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 20, 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 2026-07-20},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.