Boulder
United States · 25 May 2016
Average
11.5°C
low 4.7°C · high 17.9°C
Rainfall
5.5mm
rain recorded
Wind
1.7m/s
daily average
Humidity
61.3%
daily average
Cloud
35%
cover
Pressure
1011hPa
daily average
The temperature ranged from 4.7°C around 05:00 to 17.9°C around 16:00. Rain was recorded across 11 hours, from around 01:00 to 18:00 (5.5mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
41th percentile
Low temperature
44th percentile
Rainfall
77th percentile
Wind
21th 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 11.5°C, versus 11.5°C on this specific day.
Sun & daylight
Sunrise
05:37
Sunset
20:18
Day length
14h 41m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/Denver.
Cumulative rainfall through the day.
| Local time | UTC | Temp | Feels | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 06:00 | 9.3°C | 7.1°C | 0 | 1.6 | W | 74 | 1008 |
| 01:00 | 07:00 | 8.5°C | 6.2°C | 0.49 | 1.5 | W | 76 | 1009 |
| 02:00 | 08:00 | 7.7°C | 5.3°C | 0 | 1.7 | W | 80 | 1009 |
| 03:00 | 09:00 | 5.7°C | 2.7°C | 0 | 1.9 | W | 77 | 1009 |
| 04:00 | 10:00 | 4.8°C | 2.2°C | 0 | 1 | W | 74 | 1009 |
| 05:00 | 11:00 | 4.7°C | 2°C | 0 | 1.1 | W | 76 | 1010 |
| 06:00 | 12:00 | 4.7°C | 1.7°C | 0.58 | 1.5 | WSW | 73 | 1011 |
| 07:00 | 13:00 | 5.8°C | 2.8°C | 0.85 | 2 | WSW | 78 | 1013 |
| 08:00 | 14:00 | 10°C | 8.2°C | 0.03 | 0.9 | SSW | 71 | 1014 |
| 09:00 | 15:00 | 13.4°C | 10.1°C | 0.66 | 2.2 | SSW | 45 | 1014 |
| 10:00 | 16:00 | 14°C | 11°C | 0.23 | 1.8 | SSE | 43 | 1013 |
| 11:00 | 17:00 | 15.8°C | 12.9°C | 0.01 | 1.7 | SE | 39 | 1013 |
| 12:00 | 18:00 | 16.4°C | 13.8°C | 0.05 | 1.5 | SE | 39 | 1012 |
| 13:00 | 19:00 | 16.7°C | 14.2°C | 0.19 | 1.7 | SE | 42 | 1012 |
| 14:00 | 20:00 | 17.1°C | 14.4°C | 0.24 | 2.2 | SE | 43 | 1011 |
| 15:00 | 21:00 | 16.3°C | 13.6°C | 0.23 | 2.1 | SE | 47 | 1010 |
| 16:00 | 22:00 | 17.9°C | 14.4°C | 0.15 | 2.9 | ESE | 38 | 1008 |
| 17:00 | 23:00 | 17.4°C | 13.4°C | 0.16 | 3.4 | SE | 37 | 1009 |
| 18:00 | 00:00 | 15.9°C | 13.5°C | 1.66 | 1.5 | ESE | 45 | 1009 |
| 19:00 | 01:00 | 15.5°C | 14.1°C | 0 | 1.1 | ENE | 58 | 1010 |
| 20:00 | 02:00 | 13.3°C | 12°C | 0 | 1.3 | NNW | 70 | 1011 |
| 21:00 | 03:00 | 9.2°C | 7°C | 0 | 1.8 | NW | 81 | 1011 |
| 22:00 | 04:00 | 8.5°C | 6.3°C | 0 | 1.6 | WNW | 80 | 1012 |
| 23:00 | 05:00 | 7.5°C | 5.7°C | 0 | 1.1 | W | 84 | 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
- Boulder — 40.000°, -105.250°, ERA5 grid cell center, 2.4 km from requested point
- Time zone
- America/Denver
- What's shown here
- The hourly and daily record for 25 May 2016 specifically — not a monthly average. See the Boulder 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 (2026-07-20). Historical climate data for Boulder, United States (40.00°N, 105.25°W), derived from ERA5 (Hersbach et al., 2023, Copernicus Climate Change Service). Retrieved from https://www.pastclimate.com/
PastClimate. (2026). Historical climate data for Boulder, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 20, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Boulder, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 20, 2026, www.pastclimate.com.
@misc{pastclimate,
author = {PastClimate},
title = {Historical climate data for Boulder, United States},
year = {2026},
note = {Derived from ERA5 (Hersbach et al., 2023), Copernicus Climate Change Service. Accessed 2026-07-20},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.