Boulder
United States · 12 June 2017
Average
10.9°C
low 4.8° · high 18.9°
Rainfall
10.5mm
rain recorded
Wind
1.9m/s
daily average
Humidity
69.9%
daily average
Cloud
57%
cover
Pressure
1005hPa
daily average
The temperature ranged from 4.8°C around 05:00 to 18.9°C around 15:00. Rain was recorded across 9 hours, from around 15:00 to 23:00 (10.5mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
36th percentile
Low temperature
27th percentile
Rainfall
90th percentile
Wind
45th 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 13.2°C, versus 10.9°C on this specific day.
Sun & daylight
Sunrise
05:35
Sunset
21:20
Day length
15h 45m
Hour by hour
Temperature (line) and hourly rainfall (bars), local time — America/Denver.
Cumulative rainfall through the day.
| Local time | UTC | Temp °C | Feels °C | Rain mm | Wind m/s | Dir | Humidity % | Pressure hPa |
|---|---|---|---|---|---|---|---|---|
| 00:00 | 06:00 | 6.8 | 3.8 | 0 | 1.6 | N | 65 | 1008 |
| 01:00 | 07:00 | 7.4 | 3.9 | 0 | 2.2 | N | 61 | 1007 |
| 02:00 | 08:00 | 6.8 | 3 | 0 | 2.4 | N | 61 | 1007 |
| 03:00 | 09:00 | 5 | 1.1 | 0.02 | 2.4 | NNE | 63 | 1007 |
| 04:00 | 10:00 | 5 | 1.4 | 0 | 2.2 | N | 69 | 1007 |
| 05:00 | 11:00 | 4.8 | 1.5 | 0 | 1.9 | N | 74 | 1008 |
| 06:00 | 12:00 | 4.9 | 1.9 | 0 | 1.7 | N | 75 | 1008 |
| 07:00 | 13:00 | 5.8 | 2.9 | 0 | 1.3 | NNE | 69 | 1008 |
| 08:00 | 14:00 | 8.7 | 6.6 | 0 | 1 | ENE | 69 | 1008 |
| 09:00 | 15:00 | 12.5 | 10.1 | 0 | 1.5 | ENE | 56 | 1007 |
| 10:00 | 16:00 | 13.6 | 11.2 | 0 | 1.8 | E | 57 | 1006 |
| 11:00 | 17:00 | 14.9 | 12.2 | 0.02 | 2.2 | E | 51 | 1005 |
| 12:00 | 18:00 | 15.5 | 12.9 | 0.01 | 2.5 | ENE | 54 | 1003 |
| 13:00 | 19:00 | 15.8 | 12.7 | 0 | 3.1 | ENE | 53 | 1002 |
| 14:00 | 20:00 | 17.6 | 14.1 | 0.02 | 4 | NE | 49 | 1001 |
| 15:00 | 21:00 | 18.9 | 15.3 | 0.27 | 4.6 | NE | 51 | 1000 |
| 16:00 | 22:00 | 15.8 | 13.6 | 0.54 | 3.1 | ENE | 67 | 1001 |
| 17:00 | 23:00 | 15.5 | 14.9 | 0.16 | 0.9 | E | 69 | 1002 |
| 18:00 | 00:00 | 13.8 | 13.5 | 0.9 | 0.7 | W | 81 | 1004 |
| 19:00 | 01:00 | 12.9 | 13 | 2.66 | 0.4 | N | 91 | 1004 |
| 20:00 | 02:00 | 11.6 | 11.4 | 3.03 | 0.6 | SE | 94 | 1004 |
| 21:00 | 03:00 | 9 | 8.6 | 1.18 | 0.2 | SSE | 99 | 1003 |
| 22:00 | 04:00 | 9.7 | 8.7 | 0.78 | 1.4 | SSE | 99 | 1003 |
| 23:00 | 05:00 | 9.8 | 8.2 | 0.92 | 2.2 | S | 100 | 1003 |
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 — 46.250°, -112.000°, ERA5 grid cell center, 9.4 km from requested point
- Time zone
- America/Denver
- What's shown here
- The hourly and daily record for 12 June 2017 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 (2026-07-18). Historical climate data for Boulder, United States (46.25°N, 112.00°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 18, 2026, from https://www.pastclimate.com/
"Historical Climate Data for Boulder, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 18, 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 2026-07-18},
url = {https://www.pastclimate.com/}
}Notice something wrong with this data? Report a data issue.