Home / Keystone / 22 September 2017
Keystone
United States · 22 September 2017
← 21 September 201723 September 2017 →
Average
26.6°C
low 22.5°C · high 31.9°C
Rainfall
4.2mm
rain recorded
Wind
3m/s
daily average
Humidity
78%
daily average
Cloud
29%
cover
Pressure
1013hPa
daily average
The temperature ranged from 22.5°C around 06:00 to 31.9°C around 14:00. Rain was recorded across 4 hours, from around 11:00 to 17:00 (4.1mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
54th percentile
Low temperature
28th percentile
Rainfall
67th percentile
Wind
83th 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 26.9°C, versus 26.6°C on this specific day.
Sun & daylight
Sunrise
07:18
Sunset
19:26
Day length
12h 8m
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 | 26.1°C | 28°C | 0 | 2.9 | ENE | 72 | 1015 |
| 01:00 | 05:00 | 25.2°C | 27.1°C | 0 | 3 | ENE | 76 | 1014 |
| 02:00 | 06:00 | 24.6°C | 26.5°C | 0 | 2.8 | ENE | 78 | 1014 |
| 03:00 | 07:00 | 23.8°C | 26°C | 0 | 2.5 | NE | 82 | 1014 |
| 04:00 | 08:00 | 23.3°C | 25.7°C | 0 | 2.4 | NE | 86 | 1014 |
| 05:00 | 09:00 | 22.6°C | 24.9°C | 0 | 2.3 | NE | 88 | 1013 |
| 06:00 | 10:00 | 22.5°C | 25.3°C | 0 | 1.6 | N | 88 | 1013 |
| 07:00 | 11:00 | 22.7°C | 25.3°C | 0 | 1.8 | NNE | 88 | 1014 |
| 08:00 | 12:00 | 22.9°C | 25.2°C | 0 | 2.5 | NE | 88 | 1015 |
| 09:00 | 13:00 | 25.1°C | 28.2°C | 0 | 2.8 | NE | 86 | 1014 |
| 10:00 | 14:00 | 27.3°C | 30.4°C | 0.06 | 3.3 | NE | 80 | 1015 |
| 11:00 | 15:00 | 29.4°C | 31.7°C | 0.46 | 4.1 | ENE | 67 | 1015 |
| 12:00 | 16:00 | 29.9°C | 32.9°C | 0.03 | 3.8 | NE | 70 | 1014 |
| 13:00 | 17:00 | 31.4°C | 35.4°C | 0.11 | 3.2 | NE | 68 | 1014 |
| 14:00 | 18:00 | 31.9°C | 35.8°C | 0.25 | 2.9 | NE | 64 | 1013 |
| 15:00 | 19:00 | 30°C | 33.2°C | 0.07 | 2.9 | NE | 67 | 1012 |
| 16:00 | 20:00 | 29.8°C | 33.2°C | 0.09 | 3 | NE | 69 | 1012 |
| 17:00 | 21:00 | 30.1°C | 33.3°C | 3.06 | 3.5 | NE | 70 | 1012 |
| 18:00 | 22:00 | 27.4°C | 31.4°C | 0.02 | 1.9 | ENE | 78 | 1011 |
| 19:00 | 23:00 | 27.3°C | 30.5°C | 0 | 3.3 | ENE | 80 | 1012 |
| 20:00 | 00:00 | 26.7°C | 29.5°C | 0 | 3.4 | ENE | 79 | 1012 |
| 21:00 | 01:00 | 26.3°C | 28.7°C | 0 | 3.7 | ENE | 81 | 1013 |
| 22:00 | 02:00 | 25.8°C | 28.1°C | 0 | 3.9 | ENE | 83 | 1013 |
| 23:00 | 03:00 | 25.4°C | 28.3°C | 0 | 3.2 | ENE | 86 | 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
- Keystone — 28.250°, -82.500°, ERA5 grid cell center, 15.8 km from requested point
- Time zone
- America/New_York
- What's shown here
- The hourly and daily record for 22 September 2017 specifically — not a monthly average. See the Keystone 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 Keystone, United States (28.25°N, 82.50°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Keystone, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 20, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Keystone, 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 Keystone, 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.