Home / Old Jefferson / 12 August 2018
Old Jefferson
United States · 12 August 2018
← 11 August 201813 August 2018 →
Average
27.4°C
low 22.3° · high 33.2°
Rainfall
0.1mm
dry day
Wind
1.5m/s
daily average
Humidity
83.1%
daily average
Cloud
92%
cover
Pressure
1018hPa
daily average
The temperature ranged from 22.3°C around 06:00 to 33.2°C around 16:00. 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
50th percentile
Low temperature
6th percentile
Rainfall
23th percentile
Wind
31th 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 28.3°C, versus 27.4°C on this specific day.
Sun & daylight
Sunrise
06:28
Sunset
19:48
Day length
13h 20m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/Chicago.
Cumulative rainfall through the day.
| Local time | UTC | Temp °C | Feels °C | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 05:00 | 24.5 | 29 | 0 | 1.8 | WSW | 97 | 1018 |
| 01:00 | 06:00 | 24.2 | 28.4 | 0 | 1.9 | W | 96 | 1018 |
| 02:00 | 07:00 | 24 | 28.5 | 0 | 1.3 | W | 96 | 1017 |
| 03:00 | 08:00 | 23.7 | 28 | 0 | 1.4 | WSW | 97 | 1017 |
| 04:00 | 09:00 | 23.5 | 27.6 | 0 | 1.4 | WSW | 96 | 1017 |
| 05:00 | 10:00 | 22.8 | 26.7 | 0 | 1.7 | SW | 100 | 1017 |
| 06:00 | 11:00 | 22.3 | 26.1 | 0 | 1.5 | WSW | 100 | 1018 |
| 07:00 | 12:00 | 22.9 | 27.3 | 0 | 1 | WSW | 100 | 1019 |
| 08:00 | 13:00 | 24.4 | 29.8 | 0 | 0.8 | WNW | 98 | 1019 |
| 09:00 | 14:00 | 25.9 | 31.6 | 0 | 0.7 | W | 92 | 1019 |
| 10:00 | 15:00 | 28.3 | 33.6 | 0 | 1.2 | W | 79 | 1019 |
| 11:00 | 16:00 | 29.4 | 34.5 | 0.01 | 2 | W | 78 | 1019 |
| 12:00 | 17:00 | 29.9 | 34.6 | 0.03 | 2.1 | W | 73 | 1019 |
| 13:00 | 18:00 | 30.7 | 35.5 | 0.03 | 1.6 | W | 68 | 1018 |
| 14:00 | 19:00 | 31.8 | 36.3 | 0 | 1.7 | W | 63 | 1018 |
| 15:00 | 20:00 | 32.6 | 37 | 0 | 1.7 | W | 60 | 1017 |
| 16:00 | 21:00 | 33.2 | 37.4 | 0 | 1.8 | W | 56 | 1017 |
| 17:00 | 22:00 | 32.4 | 37.1 | 0.01 | 1.8 | NW | 62 | 1016 |
| 18:00 | 23:00 | 32.2 | 37.4 | 0 | 1.3 | NW | 65 | 1016 |
| 19:00 | 00:00 | 31 | 36.9 | 0 | 1 | ENE | 73 | 1017 |
| 20:00 | 01:00 | 28.4 | 33.9 | 0 | 1.2 | E | 81 | 1017 |
| 21:00 | 02:00 | 27.6 | 32.7 | 0 | 1.5 | E | 83 | 1018 |
| 22:00 | 03:00 | 26.2 | 31.2 | 0 | 1.6 | E | 90 | 1018 |
| 23:00 | 04:00 | 26 | 30.9 | 0 | 1.3 | ESE | 90 | 1019 |
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
- Old Jefferson — 30.500°, -91.000°, ERA5 grid cell center, 13.1 km from requested point
- Time zone
- America/Chicago
- What's shown here
- The hourly and daily record for 12 August 2018 specifically — not a monthly average. See the Old Jefferson 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 (2026-07-17). Historical climate data for Old Jefferson, United States (30.50°N, 91.00°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Old Jefferson, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 17, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Old Jefferson, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 17, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Old Jefferson, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-17},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.