Greeley climate
Greeley (Colorado, United States) has a humid subtropical climate (Köppen Cfa). The average temperature over the year is 12 °C54 °F, and about 450 mm18 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Greeley climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 744 | −424 | 134 | 190.7 |
| Feb | 745 | −524 | 135 | 230.9 |
| Mar | 1356 | −131 | 643 | 341.3 |
| Apr | 1864 | 337 | 1051 | 522.0 |
| May | 2374 | 846 | 1660 | 682.7 |
| Jun | 3188 | 1457 | 2373 | 451.8 |
| Jul | 3493 | 1865 | 2679 | 532.1 |
| Aug | 3290 | 1762 | 2476 | 441.7 |
| Sep | 2882 | 1253 | 2068 | 361.4 |
| Oct | 1967 | 440 | 1253 | 331.3 |
| Nov | 1254 | −131 | 642 | 210.8 |
| Dec | 643 | −524 | 133 | 210.8 |
| Year | 3493 | −524 | 1254 | 45018 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 56% | 64% | 2.4 | 9:35 |
| Feb | 57% | 64% | 3.3 | 10:36 |
| Mar | 52% | 58% | 4.6 | 11:50 |
| Apr | 50% | 58% | 5.6 | 13:14 |
| May | 51% | 59% | 6.3 | 14:24 |
| Jun | 43% | 46% | 7.3 | 15:02 |
| Jul | 43% | 46% | 7.0 | 14:47 |
| Aug | 44% | 47% | 6.2 | 13:46 |
| Sep | 44% | 41% | 5.2 | 12:24 |
| Oct | 49% | 49% | 3.7 | 11:03 |
| Nov | 52% | 55% | 2.7 | 9:52 |
| Dec | 58% | 65% | 2.1 | 9:18 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Greeley is like
The warmest month is July, with an average high of 34 °C93 °F and a low of 18 °C65 °F. The coldest is December, when highs average 6 °C43 °F and lows −5 °C24 °F. Seasons are strongly marked: the warmest month is on average 25.4 °C45.7 °F warmer than the coldest.
Annual precipitation is moderate at about 450 mm18 in. The wettest three-month stretch is May–July, which brings 37% of the annual total. Months with less than 20 mm0.8 in on average: January. The wettest month is May (68 mm2.7 in), the driest is January (19 mm0.7 in).
Relative humidity ranges from 43% in June to 58% in December. The clearest skies (lowest average cloud amount, 41%) are typical of September. Average wind speed near the ground ranges from 7 km/h (5 mph) in August to 12 km/h (7 mph) in January. Daylight lasts from about 9.3 hours in December to 15.0 hours in June.
Best time to visit Greeley
Based on these averages, the most comfortable months for sightseeing and outdoor activities are May and September and October: average highs of 19 °C67 °F to 28 °C82 °F with 33 mm1.3 in to 68 mm2.7 in of precipitation per month.
The most challenging month is December, which is cold, with average highs of 6 °C43 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Greeley
- Winter (December–February) — highs 643 to 7 °C45 °F, lows −524 to −4 °C24 °F, about 21 mm0.8 in of precipitation a month. Pack a warm coat, layers and closed shoes, an extra layer for the cooler mornings and evenings and shoes with good grip, as frost is common.
- Spring (March–May) — highs 1356 to 23 °C74 °F, lows −131 to 8 °C46 °F, about 51 mm2.0 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
- Summer (June–August) — highs 3188 to 34 °C93 °F, lows 1457 to 18 °C65 °F, about 47 mm1.9 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water and an extra layer for the cooler mornings and evenings.
- Autumn (September–November) — highs 1254 to 28 °C82 °F, lows −131 to 12 °C53 °F, about 30 mm1.2 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
How Greeley compares
Compared with Fort Collins, about 36 km to the northwest, Greeley is on average 0.7 °C1.2 °F warmer and receives a similar amount of precipitation. The difference is largest in April (0.7 °C1.2 °F warmer).
Of the 222 places in the United States covered by World Climates, Greeley is the 146th warmest by annual mean temperature and the 175th wettest by annual precipitation. See all of them on the United States climate page.
Places in other countries with the most similar temperature and rainfall pattern: Grozny (Russia, Cfa), Sunzha (Ordzhonikidzevskaya) (Russia, Dfa) and Buzău (Romania, Dfa).
Nearby places
- Fort Collins 36 km · 12 °C53 °F · 450 mm18 in
- Thornton 66 km · 11 °C53 °F · 448 mm18 in
- Boulder 66 km · 11 °C53 °F · 448 mm18 in
- Westminster 71 km · 11 °C52 °F · 448 mm18 in
- Denver 80 km · 12 °C54 °F · 440 mm17 in
- Lakewood 86 km · 12 °C53 °F · 440 mm17 in
- Colorado Springs 177 km · 11 °C52 °F · 402 mm16 in
- Pueblo 241 km · 13 °C56 °F · 353 mm14 in
Frequently asked questions
What is the warmest month in Greeley?
July is the warmest month in Greeley, with an average high of 34 °C (93 °F) and an average low of 18 °C (65 °F).
What is the coldest month in Greeley?
December is the coldest month, with an average high of 6 °C (43 °F) and an average low of -5 °C (24 °F).
When does it rain the most in Greeley?
May is the wettest month with about 68 mm (2.7 in) of precipitation; January is the driest with about 19 mm (0.7 in).
What is the best time to visit Greeley?
Judging by long-term averages, the most comfortable months are May and September and October.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 1,773 m, while Greeley lies at about 1,425 m. Temperatures on this page were therefore adjusted by +2.3 °C4.1 °F using the standard lapse rate of 6.5 °C per 1,000 m.