Home / Tri-Cities / 18 May 2018
Tri-Cities
United States · 18 May 2018
Average
19.6°C
low 14.8°C · high 25.2°C
Rainfall
5.3mm
rain recorded
Wind
2.9m/s
daily average
Humidity
63.9%
daily average
Cloud
50%
cover
Pressure
1013hPa
daily average
The temperature ranged from 14.8°C around 07:00 to 25.2°C around 15:00. Rain was recorded across 4 hours, from around 05:00 to 17:00 (5.3mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
58th percentile
Low temperature
83th percentile
Rainfall
98th 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 19°C, versus 19.6°C on this specific day.
Sun & daylight
Sunrise
05:20
Sunset
20:27
Day length
15h 7m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/Los_Angeles.
Cumulative rainfall through the day.
| Local time | UTC | Temp | Feels | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 07:00 | 20.3°C | 19.6°C | 0.01 | 2.4 | NNE | 64 | 1011 |
| 01:00 | 08:00 | 19.5°C | 18.9°C | 0.04 | 2.7 | N | 71 | 1011 |
| 02:00 | 09:00 | 19.3°C | 20°C | 0 | 1.7 | NNE | 80 | 1012 |
| 03:00 | 10:00 | 15.6°C | 15.7°C | 0 | 1.9 | NNE | 92 | 1012 |
| 04:00 | 11:00 | 15.7°C | 16.4°C | 0.01 | 1.2 | NNW | 95 | 1013 |
| 05:00 | 12:00 | 15.3°C | 16°C | 0.25 | 1.4 | NW | 98 | 1013 |
| 06:00 | 13:00 | 15.4°C | 15.7°C | 2.08 | 1.7 | WNW | 95 | 1013 |
| 07:00 | 14:00 | 14.8°C | 14.7°C | 2.54 | 2.3 | NW | 98 | 1013 |
| 08:00 | 15:00 | 17.5°C | 17°C | 0.08 | 2.5 | NW | 80 | 1013 |
| 09:00 | 16:00 | 18.3°C | 17.7°C | 0.05 | 2.3 | NW | 74 | 1014 |
| 10:00 | 17:00 | 19°C | 18.3°C | 0.04 | 2.3 | NW | 68 | 1014 |
| 11:00 | 18:00 | 20.1°C | 19.2°C | 0.04 | 2.3 | NW | 62 | 1014 |
| 12:00 | 19:00 | 19.9°C | 18.7°C | 0 | 2.4 | NNW | 59 | 1014 |
| 13:00 | 20:00 | 21°C | 19.4°C | 0.01 | 2.7 | NNW | 53 | 1013 |
| 14:00 | 21:00 | 22.4°C | 19.6°C | 0.01 | 3.4 | NNW | 42 | 1013 |
| 15:00 | 22:00 | 25.2°C | 22°C | 0 | 3.4 | N | 30 | 1013 |
| 16:00 | 23:00 | 25.1°C | 22°C | 0 | 3.4 | NNW | 32 | 1013 |
| 17:00 | 00:00 | 24°C | 20.6°C | 0.1 | 3.7 | NNW | 33 | 1013 |
| 18:00 | 01:00 | 23.7°C | 19.9°C | 0 | 4.4 | NNW | 34 | 1013 |
| 19:00 | 02:00 | 23°C | 18.8°C | 0 | 5.1 | N | 37 | 1013 |
| 20:00 | 03:00 | 20.3°C | 17.4°C | 0 | 4.3 | N | 52 | 1013 |
| 21:00 | 04:00 | 19.3°C | 17°C | 0 | 3.8 | N | 60 | 1014 |
| 22:00 | 05:00 | 18.2°C | 16°C | 0 | 3.7 | N | 64 | 1014 |
| 23:00 | 06:00 | 18.5°C | 16.4°C | 0 | 3.6 | N | 64 | 1014 |
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
- Tri-Cities — 46.250°, -119.250°, ERA5 grid cell center, 4.2 km from requested point
- Time zone
- America/Los_Angeles
- What's shown here
- The hourly and daily record for 18 May 2018 specifically — not a monthly average. See the Tri-Cities 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 (2026-07-21). Historical climate data for Tri-Cities, United States (46.25°N, 119.25°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Tri-Cities, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 21, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Tri-Cities, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 21, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Tri-Cities, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-21},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.