Ellicott weather by month
What a typical year looks like in Ellicott, Colorado: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Ellicott 7s, 10 km from Ellicott; records cover 2010–2026.
The year at a glance
- Precipitation a year
- 15 in381 mm
- Snow a year
- Rare
- Last spring freeze
- May 10
- First fall freeze
- Oct 5
- Heating degree days
- 5,771
- Cooling degree days
- 581
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −5°−21° (heating, 99%) and 96°36° (cooling, 1%).
Month by month
Ellicott in January
Highs average 46°8° and lows 15°−10°, with 0.29 in7.4 mm of precipitation in a typical January.
- Record high
- 70°21° (2016)
- Record low
- −24°−31° (2025)
- Heating degree days
- 1071
- Cooling degree days
- 0
Ellicott in February
Highs average 49°10° and lows 19°−7°, with 0.28 in7.1 mm of precipitation in a typical February.
- Record high
- 79°26° (2017)
- Record low
- −26°−32° (2021)
- Heating degree days
- 866
- Cooling degree days
- 0
Ellicott in March
Highs average 58°14° and lows 26°−3°, with 0.76 in19 mm of precipitation in a typical March.
- Record high
- 85°29° (2026)
- Record low
- −6°−21° (2022)
- Heating degree days
- 716
- Cooling degree days
- 0
Ellicott in April
Highs average 65°18° and lows 35°1°, with 1.4 in37 mm of precipitation in a typical April.
- Record high
- 85°29° (2022)
- Record low
- 7°−14° (2013)
- Heating degree days
- 462
- Cooling degree days
- 2
Ellicott in May
Highs average 74°24° and lows 44°7°, with 1.9 in49 mm of precipitation in a typical May.
- Record high
- 93°34° (2018)
- Record low
- 18°−8° (2011)
- Heating degree days
- 217
- Cooling degree days
- 34
Ellicott in June
Highs average 84°29° and lows 49°10°, with 1.7 in42 mm of precipitation in a typical June.
- Record high
- 101°38° (2012)
- Record low
- 28°−2° (2015)
- Heating degree days
- 54
- Cooling degree days
- 94
Ellicott in July
Highs average 87°31° and lows 55°13°, with 3 in76 mm of precipitation in a typical July.
- Record high
- 101°38° (2026)
- Record low
- 37°3° (2019)
- Heating degree days
- 7
- Cooling degree days
- 204
Ellicott in August
Highs average 86°30° and lows 56°13°, with 2.9 in75 mm of precipitation in a typical August.
- Record high
- 99°37° (2026)
- Record low
- 43°6° (2014)
- Heating degree days
- 11
- Cooling degree days
- 191
Ellicott in September
Highs average 79°26° and lows 46°8°, with 1.3 in34 mm of precipitation in a typical September.
- Record high
- 96°36° (2019)
- Record low
- 28°−2° (2013)
- Heating degree days
- 129
- Cooling degree days
- 52
Ellicott in OctoberThis month
Highs average 67°19° and lows 35°2°, with 0.82 in21 mm of precipitation in a typical October.
- Record high
- 91°33° (2015)
- Record low
- −8°−22° (2023)
- Heating degree days
- 450
- Cooling degree days
- 4
Ellicott in November
Highs average 56°13° and lows 24°−4°, with 0.36 in9.1 mm of precipitation in a typical November.
- Record high
- 80°27° (2015)
- Record low
- −13°−25° (2014)
- Heating degree days
- 758
- Cooling degree days
- 0
Ellicott in December
Highs average 47°8° and lows 16°−9°, with 0.21 in5.3 mm of precipitation in a typical December.
- Record high
- 72°22° (2015)
- Record low
- −20°−29° (2016)
- Heating degree days
- 1030
- Cooling degree days
- 0
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