Genoa, Colorado climate: Normal weather by month, frost dates and records
Genoa's normal year runs from 21°F December nights to 86°F July afternoons, with 16.2 inches of precipitation and 35 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.9°C, December lows of −6°C, July highs of 30°C, 411 mm of precipitation a year.
- NOAA stationGenoa
- Station IDUSC00053258
- Location39.28°N 103.49°W
- Elevation5,593 ft (1,705 m)
- Population154
On October 24, the normal high in Genoa is 60°F and the normal low 35°F, and the chance of measurable rain or snow is 12%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Genoa.
- Jan 42° 21°
- Feb 42° 20°
- Mar 52° 28°
- Apr 59° 34°
- May 69° 43°
- Jun 80° 53°
- Jul 86° 59°
- Aug 83° 58°
- Sep 76° 50°
- Oct 63° 38°
- Nov 50° 28°
- Dec 41° 21°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Genoa each month?
July is the warmest month, with normal highs of 86°F; December the coldest, with normal lows of 21°F. The most precipitation falls in July (2.99 in), the least in December (0.18 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 42°F | 21°F | 31.4°F | 0.34 | 5.3 | 3 | <1 | 28 | 9 h 40 min |
| February | 42°F | 20°F | 31.2°F | 0.35 | 5.0 | 3 | <1 | 26 | 10 h 40 min |
| March | 52°F | 28°F | 40.3°F | 0.69 | 5.6 | 4 | <1 | 21 | 11 h 50 min |
| April | 59°F | 34°F | 46.3°F | 1.43 | 7.1 | 6 | <1 | 13 | 13 h 10 min |
| May | 69°F | 43°F | 56.0°F | 2.38 | 1.1 | 9 | <1 | 3 | 14 h 20 min |
| June | 80°F | 53°F | 66.6°F | 2.43 | 0.0 | 8 | 6 | <1 | 14 h 50 min |
| July | 86°F | 59°F | 72.8°F | 2.99 | 0.0 | 9 | 13 | <1 | 14 h 40 min |
| August | 83°F | 58°F | 70.5°F | 2.96 | 0.0 | 9 | 8 | <1 | 13 h 50 min |
| September | 76°F | 50°F | 62.8°F | 1.00 | 0.4 | 5 | 2 | <1 | 12 h 30 min |
| October | 63°F | 38°F | 50.7°F | 1.09 | 2.5 | 4 | <1 | 9 | 11 h 10 min |
| November | 50°F | 28°F | 39.0°F | 0.34 | 4.5 | 3 | <1 | 21 | 10 h |
| December | 41°F | 21°F | 31.1°F | 0.18 | 3.8 | 3 | <1 | 27 | 9 h 30 min |
| Year (annual) | 62°F | 38°F | 49.9°F | 16.18 | 35.3 | 65 | 28 | 148 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 6°C | −6°C | −0.3°C | 9 mm | 13 cm |
| February | 6°C | −7°C | −0.4°C | 9 mm | 13 cm |
| March | 11°C | −2°C | 4.6°C | 18 mm | 14 cm |
| April | 15°C | 1°C | 7.9°C | 36 mm | 18 cm |
| May | 20°C | 6°C | 13.3°C | 60 mm | 3 cm |
| June | 27°C | 12°C | 19.2°C | 62 mm | 0 cm |
| July | 30°C | 15°C | 22.7°C | 76 mm | 0 cm |
| August | 29°C | 14°C | 21.4°C | 75 mm | 0 cm |
| September | 24°C | 10°C | 17.1°C | 25 mm | 1 cm |
| October | 17°C | 3°C | 10.4°C | 28 mm | 6 cm |
| November | 10°C | −2°C | 3.9°C | 9 mm | 11 cm |
| December | 5°C | −6°C | −0.5°C | 5 mm | 10 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00053258; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Genoa?
Normal highs sit between 65°F and 85°F in May, June, August and September. Of those, September has the fewest days with rain (5).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00053258.
When is the last frost in Genoa?
In Genoa, the last spring frost (32°F) comes after May 8 in half of years and after May 22 in one year in ten; the first autumn frost comes before October 10 in half of years and before September 28 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- May 81 year in 10 after May 22; 9 in 10 after April 25
- First autumn frost, half of years before
- October 101 year in 10 before September 28; 9 in 10 before October 23
NOAA puts the median frost-free season at 155 days, and the season without a hard freeze (28°F) at 174 days.
A hard freeze (28°F) comes after April 28 in half of springs and before October 20 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Genoa in zone 5b in ZIP code 80818, the nearest ZIP area.
Frost dates for every NOAA station in Colorado · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00053258; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Genoa?
In a normal year in Genoa, 28 days a year reach 90°F, 148 nights fall to 32°F or colder and 65 days bring measurable precipitation.
- Days at 90°F or more
- 28a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 148a normal year
- Days that stay below freezing
- 29high of 32°F or less
- Days with 0.01 inch of precipitation
- 65a normal year
- Days with 1 inch of snow or more
- 13a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00053258.
How sunny is Genoa?
Over a year 82% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Genoa, 4.9 kWh per square metre a day. August is the sunniest month (88%) and February the cloudiest (75%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 79% | 2.6 |
| February | 75% | 3.4 |
| March | 78% | 4.7 |
| April | 77% | 5.8 |
| May | 79% | 6.7 |
| June | 85% | 7.4 |
| July | 87% | 7.3 |
| August | 88% | 6.5 |
| September | 87% | 5.4 |
| October | 82% | 4.0 |
| November | 81% | 2.8 |
| December | 76% | 2.2 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Genoa need?
A normal year in Genoa brings 6,120 heating degree days, 14% more than the median U.S. place (5,373), and 642 cooling degree days, 29% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,739 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,043 | 0 |
| February | 947 | 0 |
| March | 768 | 0 |
| April | 563 | 1 |
| May | 300 | 22 |
| June | 64 | 112 |
| July | 8 | 249 |
| August | 18 | 187 |
| September | 129 | 65 |
| October | 448 | 6 |
| November | 782 | 0 |
| December | 1,051 | 0 |
| Year (annual) | 6,120 | 642 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00053258. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does Genoa's climate compare?
Genoa is warmer than 73 of the other 124 places with their own NOAA record in Colorado, and wetter than 71. Across the 7,247 U.S. stations with normals, its annual mean of 49.9°F is warmer than 40%.
In the Köppen classification computed from these normals, Genoa is BSk: cold semi-arid steppe. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Questions about Genoa's climate
What is the coldest month in Genoa?
December, with a normal high of 41°F and a normal low of 21°F. The warmest is July (86°F by day, 59°F at night).
Does it snow in Genoa?
Yes: 35 inches in a normal year, falling on 18 days with 0.1 inch or more, the most in April (7.1 inches).
What is the rainiest month in Genoa?
July, with 2.99 in of precipitation in a normal year; the driest is December with 0.18 in.
What plant hardiness zone is Genoa in?
The USDA's 2023 map puts Genoa in zone 5b in ZIP code 80818, the nearest ZIP area.
How late can frost come in Genoa?
In half of years the last 32°F night comes after May 8; in one year in ten it comes after May 22. Waiting until May 22 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Colorado climateThe statewide normals and every place in the state
- Hugo, CO9 miles from this station, 49.2°F a year
- Limon, CO13 miles from this station, 46.7°F a year
- Matheson, CO21 miles from this station, 48.3°F a year
- Shaw (4 mi ENE), CO23 miles from this station, 49.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made