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Boulder

United States · 19 May 2016

BoulderUnited States3:17 AM localChange location

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Average

11.1°C

low 1.7° · high 19.8°

Rainfall

0.5mm

dry day

Wind

2m/s

daily average

Humidity

60.7%

daily average

Cloud

22%

cover

Pressure

1008hPa

daily average

The temperature ranged from 1.7°C around 03:00 to 19.8°C around 15:00. Rain was recorded across 2 hours, from around 18:00 to 19:00 (0.5mm total).

How unusual was this day?

Compared against the same 135 calendar days (±7 days) across the other 9 years on file.

High temperature

60th percentile

Low temperature

19th percentile

Rainfall

39th percentile

Wind

53th 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°C, versus 11.1°C on this specific day.

Sun & daylight

Sunrise

05:41

Sunset

20:13

Day length

14h 32m

Hour by hour

Temperature (line) and hourly rainfall (bars), local time — America/Denver.

↓ Download CSV
00:0006:0012:0018:0023:00

Cumulative rainfall through the day.

00:0006:0012:0018:0023:00
Local timeUTCTemp °CFeels °CRain mmWind m/sDirHumidity %Pressure hPa
00:0006:002.3-0.801.9W961013
01:0007:002.2-1.102.1W921013
02:0008:002-1.402.2W911012
03:0009:001.7-1.902.3W891011
04:0010:002.1-1.502.5W911011
05:0011:002.4-1.302.7W881011
06:0012:002.4-1.302.6W881010
07:0013:004.91.602.5W871011
08:0014:009.16.801.9WSW781010
09:0015:0014.61201.2SW411010
10:0016:0015.312.70.041.4SSW421009
11:0017:0016.914.20.061.3S341008
12:0018:0017.514.90.041.1SSE341007
13:0019:0018.215.50.061.5SE341007
14:0020:0018.515.302.3SE341006
15:0021:0019.816.402.6SE321005
16:0022:0019.314.604.1SE311003
17:0023:0019.516.70.011.7SE301005
18:0000:0018.316.70.180N341005
19:0001:0016.915.40.151.4S551004
20:0002:0015.412.302.4SSW441005
21:0003:0010.7802.1SW661005
22:0004:009.86.802.3WSW671005
23:0005:007.74.702.4WSW791006

Same date, other years

202520242023202220212020201920182017

Nearby cities

Louisville

0km away, same day

Superior

0km away, same day

Gunbarrel

0km away, same day

Niwot

0km away, same day

Broomfield

21.3km away, same day

Northglenn

21.3km away, same day

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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 19 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

Plain text
PastClimate (2026-07-17). 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/
APA
PastClimate. (2026). Historical climate data for Boulder, United States [Data set]. Derived from ERA5 (Copernicus Climate Change Service). Retrieved July 17, 2026, from https://www.pastclimate.com/
MLA
"Historical Climate Data for Boulder, United States." PastClimate, derived from ERA5 (Copernicus Climate Change Service), July 17, 2026, www.pastclimate.com.
BibTeX
@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 2026-07-17},
  url = {https://www.pastclimate.com/}
}

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