Home / Thermal / 18 August 2018
Thermal
United States · 18 August 2018
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Average
31.8°C
low 26° · high 38.4°
Rainfall
0mm
dry day
Wind
2m/s
daily average
Humidity
42.7%
daily average
Cloud
12%
cover
Pressure
1013hPa
daily average
The temperature ranged from 26°C around 03:00 to 38.4°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
64th percentile
Low temperature
70th percentile
Rainfall
77th percentile
Wind
77th 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 30.9°C, versus 31.8°C on this specific day.
Sun & daylight
Sunrise
06:09
Sunset
19:27
Day length
13h 19m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/Los_Angeles.
Cumulative rainfall through the day.
| Local time | UTC | Temp °C | Feels °C | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 07:00 | 28.9 | 30.6 | 0 | 2 | W | 54 | 1015 |
| 01:00 | 08:00 | 27.9 | 29.6 | 0 | 1.9 | W | 56 | 1015 |
| 02:00 | 09:00 | 26.6 | 29.2 | 0 | 1.6 | W | 67 | 1015 |
| 03:00 | 10:00 | 26 | 27.7 | 0 | 1.6 | WNW | 61 | 1015 |
| 04:00 | 11:00 | 26.1 | 27.7 | 0 | 1.6 | W | 61 | 1014 |
| 05:00 | 12:00 | 26.3 | 28 | 0 | 1.5 | W | 60 | 1014 |
| 06:00 | 13:00 | 26.2 | 28 | 0 | 1.3 | WNW | 59 | 1015 |
| 07:00 | 14:00 | 26.1 | 28.2 | 0 | 1.2 | W | 63 | 1015 |
| 08:00 | 15:00 | 28.2 | 29.6 | 0 | 1.4 | W | 51 | 1016 |
| 09:00 | 16:00 | 30.1 | 31.3 | 0 | 1.4 | W | 45 | 1016 |
| 10:00 | 17:00 | 32.2 | 33.4 | 0 | 1.3 | SW | 39 | 1016 |
| 11:00 | 18:00 | 33.4 | 34.6 | 0 | 1.4 | SSW | 37 | 1015 |
| 12:00 | 19:00 | 34.6 | 35.9 | 0 | 1.5 | SSW | 35 | 1014 |
| 13:00 | 20:00 | 35.9 | 37 | 0 | 1.8 | SSW | 32 | 1013 |
| 14:00 | 21:00 | 37.4 | 37 | 0 | 1.9 | SW | 23 | 1013 |
| 15:00 | 22:00 | 38.1 | 37.8 | 0 | 2.4 | SW | 25 | 1012 |
| 16:00 | 23:00 | 38.4 | 37.8 | 0 | 2.8 | WSW | 24 | 1011 |
| 17:00 | 00:00 | 38.2 | 37.2 | 0 | 3.2 | WSW | 24 | 1010 |
| 18:00 | 01:00 | 37.9 | 36.8 | 0 | 3.4 | WSW | 25 | 1010 |
| 19:00 | 02:00 | 36.6 | 35.5 | 0 | 3.1 | WSW | 25 | 1010 |
| 20:00 | 03:00 | 33.7 | 34 | 0 | 3 | WSW | 37 | 1011 |
| 21:00 | 04:00 | 32.1 | 32.2 | 0 | 2.9 | WSW | 39 | 1012 |
| 22:00 | 05:00 | 31 | 31.4 | 0 | 2.6 | W | 42 | 1012 |
| 23:00 | 06:00 | 30.1 | 30.5 | 0 | 2.3 | W | 43 | 1012 |
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
- Thermal — 33.750°, -116.250°, ERA5 grid cell center, 15.9 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- The hourly and daily record for 18 August 2018 specifically — not a monthly average. See the Thermal 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 Thermal, United States (33.75°N, 116.25°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Thermal, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 17, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Thermal, 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 Thermal, 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.