Home / Keystone / 29 September 2018
Keystone
United States · 29 September 2018
← 28 September 201830 September 2018 →
Average
28.3°C
low 24.4° · high 33.9°
Rainfall
1.1mm
rain recorded
Wind
2.5m/s
daily average
Humidity
75.1%
daily average
Cloud
66%
cover
Pressure
1019hPa
daily average
The temperature ranged from 24.4°C around 08:00 to 33.9°C around 17:00. Rain was recorded across 2 hours, from around 16:00 to 17:00 (1.1mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
100th percentile
Low temperature
93th percentile
Rainfall
56th percentile
Wind
50th 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 28.3°C on this specific day.
Sun & daylight
Sunrise
07:21
Sunset
19:18
Day length
11h 56m
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 | 25.4 | 28.8 | 0 | 2.6 | NNE | 87 | 1020 |
| 01:00 | 05:00 | 25 | 28.6 | 0 | 2.3 | NE | 89 | 1019 |
| 02:00 | 06:00 | 24.8 | 28.6 | 0 | 2.1 | NE | 90 | 1019 |
| 03:00 | 07:00 | 24.7 | 28.7 | 0 | 2 | ENE | 91 | 1019 |
| 04:00 | 08:00 | 24.7 | 28.5 | 0 | 2.1 | ENE | 92 | 1018 |
| 05:00 | 09:00 | 24.6 | 28.5 | 0 | 2 | E | 92 | 1018 |
| 06:00 | 10:00 | 24.5 | 28.5 | 0 | 1.8 | E | 92 | 1019 |
| 07:00 | 11:00 | 24.5 | 28.6 | 0 | 1.8 | ENE | 93 | 1019 |
| 08:00 | 12:00 | 24.4 | 28 | 0 | 2.3 | E | 92 | 1019 |
| 09:00 | 13:00 | 26.1 | 30.6 | 0 | 2.2 | E | 90 | 1020 |
| 10:00 | 14:00 | 28.3 | 33 | 0 | 2.5 | ESE | 83 | 1020 |
| 11:00 | 15:00 | 30.7 | 34.2 | 0 | 2.8 | ESE | 65 | 1020 |
| 12:00 | 16:00 | 31.8 | 35.4 | 0.02 | 2.6 | ESE | 61 | 1020 |
| 13:00 | 17:00 | 32.4 | 35.5 | 0 | 2.5 | E | 55 | 1019 |
| 14:00 | 18:00 | 33.4 | 36.4 | 0 | 2.4 | E | 51 | 1019 |
| 15:00 | 19:00 | 33.5 | 36.5 | 0.04 | 2.4 | ENE | 51 | 1018 |
| 16:00 | 20:00 | 33.8 | 37 | 0.23 | 2.3 | E | 51 | 1017 |
| 17:00 | 21:00 | 33.9 | 36.5 | 0.81 | 3.4 | ENE | 52 | 1017 |
| 18:00 | 22:00 | 30.6 | 34.7 | 0.02 | 2.5 | ENE | 68 | 1017 |
| 19:00 | 23:00 | 29.7 | 33.2 | 0 | 2.5 | ENE | 68 | 1017 |
| 20:00 | 00:00 | 28.9 | 32 | 0 | 3 | E | 69 | 1017 |
| 21:00 | 01:00 | 28.5 | 31.1 | 0 | 3.4 | E | 70 | 1018 |
| 22:00 | 02:00 | 28.1 | 30.8 | 0 | 3.4 | E | 72 | 1019 |
| 23:00 | 03:00 | 27.2 | 30.2 | 0 | 3.2 | E | 78 | 1020 |
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
- 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 29 September 2018 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 (2026-07-18). 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 18, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Keystone, 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 Keystone, 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.