Northglenn climate — normals and trends
Northglenn (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 9.0 °C and it receives 536 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (22.3 °C on average) and the coldest is January (-3.3 °C). Rainfall peaks in May.
Northglenn averages 151 frost days, 42 hot days (≥ 30 °C) and 94 rainy days per year.
Northglenn has warmed by +2.5 °C between 1940 and 2025, or +0.29 °C per decade. This trend is statistically significant.
The number of frost days there went from about 165 to 137 per year over the period.
The hottest day of the period reached 38.8 °C (on 23 June 1954) and the coldest -38.6 °C (on 12 January 1963).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
NorthglennColorado
- coords
- 39.89°, -104.99°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.0°C
Average daily high
16.5°C
Average daily low
2.4°C
Annual rainfall
536mm
Sunshine / day
10.6h
Mean relative humidity
57%
Average peak wind
13.9km/h
Seasonal range
25.6°C
Frost days (< 0 °C)
151 d/yr
Hot days (≥ 30 °C)
42 d/yr
Rainy days (≥ 1 mm)
94 d/yr
Annual snowfall
118.1 cm
Average feels-like high
14.0 °C
Average feels-like low
-0.8 °C
Average peak gust
29.8 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
18.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.5 °C
since 1940
+0.3 °C per decade · r² = 0.44 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
38.8 °C
23 June 1954
Coldest day
-38.6 °C
12 January 1963
Wettest day
71 mm
8 June 1974
Windiest day
56.6 km/h
10 October 1949
Strongest gust
109.8 km/h
10 October 1949
Hottest feels-like
39.5 °C
26 June 1994
Coldest feels-like
-43.7 °C
12 January 1963
Snowiest day
35.6 cm
18 March 2003
Sunniest day
14.2 h
24 June 1940
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 2.0 °C | -2.0 °C | 30 mm | +8 mm |
| Feb | 5.6 °C | -0.4 °C | 31 mm | +7 mm |
| Mar | 15.6 °C | +5.4 °C | 36 mm | -12 mm |
| Apr | 17.1 °C | +1.9 °C | 46 mm | -24 mm |
| May | 21.0 °C | +0.8 °C | 100 mm | +7 mm |
| Jun | 27.5 °C | +1.2 °C | 88 mm | +28 mm |
| Jul | 31.4 °C | +1.6 °C | 41 mm | -3 mm |
| Aug | 29.6 °C | +0.8 °C | 83 mm | +40 mm |
| Sep | 25.3 °C | +0.7 °C | 56 mm | +16 mm |
| Oct | 19.5 °C | +1.5 °C | 24 mm | -15 mm |
| Nov | 15.2 °C | +5.3 °C | 6 mm | -24 mm |
| Dec | 13.0 °C | +7.8 °C | 17 mm | -6 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Northglenn?
Northglenn has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 9.0 °C and it receives 536 mm of precipitation per year.
What is the hottest day ever recorded in Northglenn?
The hottest day measured in Northglenn between 1940 and 2025 was 23 June 1954, reaching 38.8 °C.
What is the coldest day in Northglenn?
The coldest day measured in Northglenn between 1940 and 2025 was 12 January 1963, at -38.6 °C.
Does it snow in Northglenn?
Yes. Northglenn gets on average 118.1 cm of snow per year and has around 151 frost days.
Has the climate of Northglenn warmed?
Yes: Northglenn warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Northglenn?
The wettest day measured in Northglenn between 1940 and 2025 was 8 June 1974, with 71 mm of rain in 24 hours.
What was the windiest day in Northglenn?
The windiest day measured in Northglenn between 1940 and 2025 was 10 October 1949, with winds reaching 56.6 km/h.
What is the warmest month in Northglenn?
The warmest month in Northglenn is July (22.3 °C on average); the coldest is January (-3.3 °C).
How much does it rain in Northglenn?
Northglenn receives on average 536 mm of precipitation per year, spread over about 94 rainy days.
Is it sunny in Northglenn?
Northglenn gets on average 10.6 hours of sunshine per day, roughly 3,869 hours per year over 1940-2025.
What is the biggest single-day snowfall in Northglenn?
The heaviest 24-hour snowfall measured in Northglenn between 1940 and 2025 was 18 March 2003, with 35.6 cm.
Are there tropical nights in Northglenn?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Northglenn.
What was the most extreme apparent temperature in Northglenn?
In Northglenn, between 1940 and 2025, the highest apparent temperature reached 39.5 °C on 26 June 1994, and the lowest was -43.7 °C on 12 January 1963.
Compare Northglenn with another city
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Nearby cities
The climate around Northglenn