Mertzon
United States · 18 May 2021
Average
20.5°C
low 15.3° · high 27.4°
Rainfall
82.4mm
rain recorded
Wind
4.7m/s
daily average
Humidity
75.4%
daily average
Cloud
60%
cover
Pressure
1009hPa
daily average
The temperature ranged from 15.3°C around 08:00 to 27.4°C around 17:00. Rain was recorded across 12 hours, from around 02:00 to 20:00 (82.4mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
21th percentile
Low temperature
20th percentile
Rainfall
100th percentile
Wind
43th 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 24.5°C, versus 20.5°C on this specific day.
Sun & daylight
Sunrise
06:45
Sunset
20:34
Day length
13h 49m
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 | 20.2 | 19.4 | 0 | 4.3 | SE | 80 | 1007 |
| 01:00 | 06:00 | 20.3 | 19.4 | 0.01 | 4.6 | ENE | 80 | 1009 |
| 02:00 | 07:00 | 20.7 | 17.9 | 11.25 | 7.7 | ENE | 81 | 1009 |
| 03:00 | 08:00 | 21.2 | 19.1 | 9.2 | 6.8 | ENE | 80 | 1009 |
| 04:00 | 09:00 | 19.4 | 17.6 | 8.62 | 6.3 | NE | 88 | 1008 |
| 05:00 | 10:00 | 15.7 | 15.6 | 11.35 | 1.9 | ENE | 88 | 1011 |
| 06:00 | 11:00 | 15.7 | 15.1 | 14.61 | 2.8 | N | 90 | 1011 |
| 07:00 | 12:00 | 15.7 | 14.6 | 14.16 | 3.5 | NNE | 91 | 1011 |
| 08:00 | 13:00 | 15.3 | 13.6 | 8.81 | 4 | ENE | 90 | 1011 |
| 09:00 | 14:00 | 15.8 | 13.2 | 1.1 | 5.4 | E | 88 | 1012 |
| 10:00 | 15:00 | 18.4 | 15.7 | 0.14 | 5.8 | ESE | 77 | 1011 |
| 11:00 | 16:00 | 18.9 | 16.1 | 0.01 | 6 | SE | 76 | 1010 |
| 12:00 | 17:00 | 20.3 | 17.9 | 0 | 5.8 | SSE | 72 | 1010 |
| 13:00 | 18:00 | 21.6 | 19.6 | 0 | 5.1 | SSE | 66 | 1009 |
| 14:00 | 19:00 | 22.7 | 21.4 | 0.09 | 4.6 | S | 65 | 1008 |
| 15:00 | 20:00 | 24.1 | 23.8 | 0 | 3.6 | S | 63 | 1007 |
| 16:00 | 21:00 | 25.7 | 25.7 | 0.03 | 2.8 | S | 54 | 1006 |
| 17:00 | 22:00 | 27.4 | 26.3 | 0.06 | 3.8 | SE | 46 | 1006 |
| 18:00 | 23:00 | 26.8 | 24.4 | 0.49 | 5.1 | SE | 45 | 1005 |
| 19:00 | 00:00 | 23.1 | 22 | 2.03 | 4.6 | ESE | 66 | 1006 |
| 20:00 | 01:00 | 22.1 | 21.4 | 0.47 | 4.7 | ESE | 75 | 1007 |
| 21:00 | 02:00 | 22.5 | 22.2 | 0 | 4.5 | SE | 76 | 1007 |
| 22:00 | 03:00 | 19.3 | 18.3 | 0 | 4.6 | SE | 85 | 1008 |
| 23:00 | 04:00 | 18.9 | 18.1 | 0 | 4.1 | SE | 85 | 1008 |
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
- Mertzon — 31.250°, -100.750°, ERA5 grid cell center, 6.5 km from requested point
- Time zone
- America/Chicago
- What's shown here
- The hourly and daily record for 18 May 2021 specifically — not a monthly average. See the Mertzon 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 Mertzon, United States (31.25°N, 100.75°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Mertzon, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 17, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Mertzon, 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 Mertzon, 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.