Climate averages 1991–2020
Greeley weather
in May.
A warm, moderately wet month: the 5th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a warm month in Greeley: daytime highs average 22.0°C and nights cool to about 7.7°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 67 mm of rain on roughly 10 days, which makes May a moderately wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 24 min on an average May day.
The nearest other city in this atlas is Loveland (31 km away). In May its highs average 19.7°C, 2.3°C cooler than Greeley, with 87 mm of rain.
Among the 498 cities listed in the United States, Greeley ranks joint 296th of 498 for the warmest May highs and joint 174th of 498 for the driest May (rainfall, lowest first). The mean May high of those 498 cities is 23.8°C; Greeley is 1.8°C cooler than that mean.
From May to June, average highs rise by 6.3°C to 28.3°C, and monthly rainfall falls from 67 mm to 40 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Greeley climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 5.4°C-7.4°C | -7.4°C | 11 | 2.9 | 9.610 h |
| February | 7.4°C-6.3°C | -6.3°C | 11 | 3.4 | 10.611 h |
| March | 12.9°C-2.3°C | -2.3°C | 29 | 5.4 | 11.912 h |
| April | 16.9°C2.2°C | 2.2°C | 49 | 8.5 | 13.313 h |
| May, selected | 22.0°C7.7°C | 7.7°C | 67 | 9.7 | 14.414 h |
| June | 28.3°C13.3°C | 13.3°C | 40 | 7.3 | 15.015 h |
| July | 31.9°C17.1°C | 17.1°C | 36 | 7.4 | 14.815 h |
| August | 30.5°C16.0°C | 16.0°C | 31 | 6.6 | 13.814 h |
| September | 26.0°C11.3°C | 11.3°C | 27 | 4.6 | 12.513 h |
| October | 17.9°C3.9°C | 3.9°C | 30 | 5.1 | 11.211 h |
| November | 10.4°C-2.7°C | -2.7°C | 16 | 3.8 | 10.010 h |
| December | 4.9°C-6.8°C | -6.8°C | 11 | 2.9 | 9.39 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Loveland in MayUnited States · 31 kmHigh 19.7°C · Low 5.6°C · 87 mm rain
- Fort Collins in MayUnited States · 36 kmHigh 19.5°C · Low 5.6°C · 87 mm rain
- Longmont in MayUnited States · 44 kmHigh 19.9°C · Low 5.9°C · 87 mm rain
- Thornton in MayUnited States · 66 kmHigh 19.6°C · Low 5.3°C · 82 mm rain
- Boulder in MayUnited States · 66 kmHigh 19.2°C · Low 5.1°C · 103 mm rain
- Westminster (Colorado), United States in MayUnited States · 71 kmHigh 19.6°C · Low 5.2°C · 82 mm rain
- Arvada in MayUnited States · 76 kmHigh 19.6°C · Low 5.1°C · 82 mm rain
- Aurora (Colorado), United States in MayUnited States · 78 kmHigh 20.7°C · Low 6.7°C · 63 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Greeley) is explained once on the Greeley year overview and on the Sources, method and limits page.