Boulder
United States · 15 May 2016
Average
7.2°C
low 2.8°C · high 10.6°C
Rainfall
10.6mm
rain recorded
Wind
1.2m/s
daily average
Humidity
76.2%
daily average
Cloud
96%
cover
Pressure
1014hPa
daily average
The temperature ranged from 2.8°C around 06:00 to 10.6°C around 15:00. Rain was recorded across 12 hours, from around 05:00 to 23:00 (10.6mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
17th percentile
Low temperature
30th percentile
Rainfall
86th percentile
Wind
1th 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 10.2°C, versus 7.2°C on this specific day.
Sun & daylight
Sunrise
05:45
Sunset
20:10
Day length
14h 25m
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 | 5.7°C | 2.9°C | 0.01 | 1.4 | ENE | 69 | 1021 |
| 01:00 | 07:00 | 5.1°C | 2.3°C | 0.04 | 1.4 | E | 72 | 1021 |
| 02:00 | 08:00 | 5°C | 2.5°C | 0 | 0.8 | E | 73 | 1020 |
| 03:00 | 09:00 | 4°C | 1.6°C | 0.05 | 0.5 | ESE | 76 | 1019 |
| 04:00 | 10:00 | 3.6°C | 1°C | 0.06 | 1.1 | SSE | 82 | 1019 |
| 05:00 | 11:00 | 3.1°C | 0.7°C | 0.16 | 0.7 | ESE | 81 | 1018 |
| 06:00 | 12:00 | 2.8°C | 0.6°C | 0 | 0.3 | SSE | 80 | 1017 |
| 07:00 | 13:00 | 3.4°C | 1.1°C | 0 | 0.5 | S | 80 | 1016 |
| 08:00 | 14:00 | 5.5°C | 3.2°C | 0 | 0.7 | ESE | 78 | 1014 |
| 09:00 | 15:00 | 8.3°C | 6°C | 0 | 1.2 | E | 71 | 1013 |
| 10:00 | 16:00 | 9.4°C | 7°C | 0 | 1.5 | E | 68 | 1012 |
| 11:00 | 17:00 | 10.4°C | 7.9°C | 0.06 | 1.7 | E | 65 | 1011 |
| 12:00 | 18:00 | 10.1°C | 7.4°C | 0.51 | 2 | E | 68 | 1010 |
| 13:00 | 19:00 | 8.6°C | 6.3°C | 0.43 | 1.3 | ESE | 72 | 1010 |
| 14:00 | 20:00 | 9.5°C | 8.1°C | 1.65 | 0.5 | ENE | 74 | 1010 |
| 15:00 | 21:00 | 10.6°C | 8.2°C | 0.43 | 1.6 | NNE | 63 | 1009 |
| 16:00 | 22:00 | 10.2°C | 7.4°C | 0.05 | 2.6 | NNE | 72 | 1009 |
| 17:00 | 23:00 | 10.2°C | 7.6°C | 0.52 | 2.2 | NE | 70 | 1010 |
| 18:00 | 00:00 | 9.8°C | 7.3°C | 0.18 | 1.8 | NE | 69 | 1010 |
| 19:00 | 01:00 | 8.9°C | 6.9°C | 0.65 | 1.3 | NNE | 80 | 1011 |
| 20:00 | 02:00 | 7.8°C | 6°C | 1.36 | 1 | NNE | 85 | 1011 |
| 21:00 | 03:00 | 6.9°C | 5.4°C | 2.15 | 0.7 | N | 92 | 1011 |
| 22:00 | 04:00 | 7°C | 5.5°C | 2 | 0.8 | NW | 92 | 1012 |
| 23:00 | 05:00 | 6.6°C | 5°C | 0.33 | 1 | W | 97 | 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 15 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 (2026-07-19). 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 19, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Boulder, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 19, 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 2026-07-19},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.