Home / Keystone / 30 September 2017
Keystone
United States · 30 September 2017
← 29 September 20171 October 2017 →
Average
25.8°C
low 23.7°C · high 29.5°C
Rainfall
30.1mm
rain recorded
Wind
1.9m/s
daily average
Humidity
88.8%
daily average
Cloud
96%
cover
Pressure
1013hPa
daily average
The temperature ranged from 23.7°C around 07:00 to 29.5°C around 16:00. Rain was recorded across 15 hours, from around 04:00 to 20:00 (30.1mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
18th percentile
Low temperature
72th percentile
Rainfall
97th percentile
Wind
23th 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 26.2°C, versus 25.8°C on this specific day.
Sun & daylight
Sunrise
07:22
Sunset
19:16
Day length
11h 54m
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 | 25°C | 29.5°C | 0 | 1.3 | ESE | 91 | 1014 |
| 01:00 | 05:00 | 24.9°C | 29.5°C | 0 | 1.1 | SE | 91 | 1013 |
| 02:00 | 06:00 | 24.8°C | 29°C | 0 | 1.4 | SSE | 90 | 1013 |
| 03:00 | 07:00 | 24.8°C | 29.6°C | 0.03 | 0.7 | NNE | 90 | 1013 |
| 04:00 | 08:00 | 24.6°C | 29.1°C | 1.16 | 1.3 | NNW | 92 | 1013 |
| 05:00 | 09:00 | 24.7°C | 28.9°C | 0.02 | 1.2 | N | 89 | 1013 |
| 06:00 | 10:00 | 23.7°C | 28.1°C | 0.03 | 1.4 | NW | 96 | 1013 |
| 07:00 | 11:00 | 23.7°C | 27.8°C | 0.22 | 1.6 | W | 96 | 1013 |
| 08:00 | 12:00 | 24°C | 28.4°C | 0.28 | 1.3 | W | 94 | 1013 |
| 09:00 | 13:00 | 24.7°C | 29.6°C | 0.15 | 0.9 | WNW | 94 | 1014 |
| 10:00 | 14:00 | 25.8°C | 31.3°C | 0.49 | 0.6 | NW | 90 | 1015 |
| 11:00 | 15:00 | 27.1°C | 31.9°C | 0.41 | 0.9 | WNW | 80 | 1015 |
| 12:00 | 16:00 | 27.2°C | 31.7°C | 0.29 | 1.5 | WNW | 80 | 1015 |
| 13:00 | 17:00 | 27.9°C | 33°C | 0.22 | 1.7 | WNW | 83 | 1014 |
| 14:00 | 18:00 | 28.2°C | 33.2°C | 0.19 | 2.1 | WNW | 84 | 1014 |
| 15:00 | 19:00 | 28.5°C | 33.2°C | 4.2 | 2.4 | WNW | 81 | 1013 |
| 16:00 | 20:00 | 29.5°C | 33.8°C | 9.81 | 3 | NW | 77 | 1013 |
| 17:00 | 21:00 | 27.9°C | 32.3°C | 9.78 | 2.2 | NNW | 81 | 1013 |
| 18:00 | 22:00 | 26.3°C | 31°C | 1.55 | 2.7 | NNW | 94 | 1013 |
| 19:00 | 23:00 | 25.6°C | 29.6°C | 0.84 | 2.8 | NNE | 93 | 1014 |
| 20:00 | 00:00 | 25.2°C | 28.7°C | 0.35 | 3.2 | NNE | 92 | 1014 |
| 21:00 | 01:00 | 25°C | 28.1°C | 0.05 | 3.4 | NNE | 91 | 1014 |
| 22:00 | 02:00 | 25°C | 28.1°C | 0 | 3.3 | NNE | 91 | 1014 |
| 23:00 | 03:00 | 24.6°C | 28.1°C | 0 | 2.8 | NNE | 93 | 1014 |
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 30 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.