Boulder
United States · 22 May 2016
Average
13°C
low 6.3° · high 19.2°
Rainfall
0.9mm
dry day
Wind
2.5m/s
daily average
Humidity
51.2%
daily average
Cloud
17%
cover
Pressure
1005hPa
daily average
The temperature ranged from 6.3°C around 06:00 to 19.2°C around 15:00. Rain was recorded across 2 hours, from around 17:00 to 18:00 (0.9mm total).
How unusual was this day?
Compared against the same 135 calendar days (±7 days) across the other 9 years on file.
High temperature
56th percentile
Low temperature
72th percentile
Rainfall
42th percentile
Wind
85th 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 11.2°C, versus 13°C on this specific day.
Sun & daylight
Sunrise
05:39
Sunset
20:16
Day length
14h 37m
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 | 12.8 | 8.6 | 0 | 3.2 | SW | 42 | 1003 |
| 01:00 | 07:00 | 12 | 7.7 | 0 | 3.2 | WSW | 43 | 1003 |
| 02:00 | 08:00 | 11.1 | 7 | 0 | 3 | WSW | 46 | 1003 |
| 03:00 | 09:00 | 9.4 | 5.1 | 0 | 3.1 | W | 48 | 1003 |
| 04:00 | 10:00 | 6.9 | 3.1 | 0 | 2.6 | W | 60 | 1005 |
| 05:00 | 11:00 | 7 | 3.6 | 0 | 1.8 | W | 58 | 1007 |
| 06:00 | 12:00 | 6.3 | 3.3 | 0 | 1.4 | W | 62 | 1008 |
| 07:00 | 13:00 | 9.1 | 6.4 | 0 | 1.4 | WSW | 61 | 1009 |
| 08:00 | 14:00 | 11.7 | 9.7 | 0 | 1 | S | 59 | 1009 |
| 09:00 | 15:00 | 14.1 | 11.5 | 0 | 1.8 | SE | 49 | 1009 |
| 10:00 | 16:00 | 15.1 | 11.9 | 0 | 2.8 | ESE | 49 | 1009 |
| 11:00 | 17:00 | 16.3 | 13.2 | 0.02 | 2.7 | ESE | 45 | 1008 |
| 12:00 | 18:00 | 16.8 | 13.3 | 0.05 | 3.2 | ESE | 44 | 1007 |
| 13:00 | 19:00 | 17.5 | 13.7 | 0.04 | 3.8 | E | 43 | 1006 |
| 14:00 | 20:00 | 18.2 | 14.5 | 0.09 | 3.6 | ESE | 41 | 1004 |
| 15:00 | 21:00 | 19.2 | 16 | 0.03 | 2.8 | E | 38 | 1003 |
| 16:00 | 22:00 | 17.8 | 14.5 | 0.03 | 3.5 | N | 48 | 1002 |
| 17:00 | 23:00 | 18 | 14.2 | 0.12 | 4.2 | NNW | 46 | 1002 |
| 18:00 | 00:00 | 16 | 12.8 | 0.55 | 3.5 | NNW | 54 | 1002 |
| 19:00 | 01:00 | 15.3 | 12.7 | 0 | 2.5 | N | 55 | 1003 |
| 20:00 | 02:00 | 14.2 | 11.9 | 0 | 1.7 | NNW | 54 | 1004 |
| 21:00 | 03:00 | 10.3 | 7.7 | 0 | 1.5 | NNW | 60 | 1005 |
| 22:00 | 04:00 | 9.2 | 6.7 | 0 | 1.1 | N | 60 | 1007 |
| 23:00 | 05:00 | 8.4 | 5.9 | 0 | 1.1 | WSW | 62 | 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
- 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 22 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 (2026-07-18). 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 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.