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Greeley, CO Weather on May 15
May 15th in Greeley, CO typically brings pleasant spring weather, with average highs around 75°F and lows near 45°F — a 30°F daily swing. Over 55 years of records, the warmest May 15th was in 1996 (72°F average), while the coldest was 2011 (45°F) — a 27°F range across recorded history. Rain or other precipitation has occurred on about 36% of May 15th dates historically, with the wettest May 15th recording 2.21" of rain. The last decade has been 2.3°F cooler on this date compared to 20-30 years ago.
What to Expect on May 15
Planning for May 15th in Greeley, CO? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
May 15 Weather Records for Greeley
- •The all-time record high for May 15th in Greeley, CO is 91°F, set in 1978.
- •The coldest May 15th on record dropped to 36°F in 1985.
- •Temperatures have reached 90°F or higher on May 15th in 2 of the last 55 years.
Frequently Asked Questions
What was the warmest May 15 ever in Greeley?
The warmest May 15 in Greeley, CO reached 91°F in 1978. That is 16°F above the long-term average high of 75°F.
What was the coldest May 15 ever in Greeley?
The coldest May 15 in Greeley, CO dropped to 36°F in 1985. That is 9°F below the long-term average low of 45°F.
What is the average temperature on May 15 in Greeley?
On May 15, Greeley averages a high of 75°F and a low of 45°F based on 55 years of NOAA weather observations from GREELEY UNC.
How many years of weather data are available for May 15 in Greeley?
We have 55 years of weather records for May 15 in Greeley, CO, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
May 15 Weather History in Greeley
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 71°F | 41°F | 2.21" | -- |
| 2024 | 80°F | 47°F | 0.3" | -- |
| 2023 | 63°F | 50°F | 0.13" | -- |
| 2022 | 78°F | 52°F | 0" | -- |
| 2021 | 72°F | 50°F | 0.28" | -- |
| 2020 | 69°F | 50°F | 0" | -- |
| 2019 | 89°F | 46°F | 0" | -- |
| 2018 | 77°F | 43°F | 0" | -- |
| 2017 | 80°F | 51°F | 0" | -- |
| 2016 | 56°F | 41°F | 0" | -- |
| 2015 | 75°F | 49°F | 0.2" | -- |
| 2014 | 63°F | 44°F | 0.13" | -- |
| 2013 | 88°F | 54°F | 0" | -- |
| 2012 | 83°F | 43°F | 0" | -- |
| 2011 | 52°F | 39°F | 0" | -- |
| 2010 | 65°F | 42°F | 0.25" | -- |
| 2009 | 81°F | 50°F | 0" | -- |
| 2008 | 65°F | 42°F | 0.18" | -- |
| 2007 | 66°F | 48°F | 1.73" | -- |
| 2006 | 79°F | 38°F | 0" | -- |
| 2005 | 81°F | 43°F | 0" | -- |
| 2004 | 71°F | 43°F | 0" | -- |
| 2003 | 69°F | 48°F | 0" | -- |
| 2002 | 81°F | 46°F | 0.25" | -- |
| 2001 | 86°F | 52°F | 0" | -- |
| 2000 | 86°F | 43°F | 0" | -- |
| 1999 | 75°F | 44°F | 0" | -- |
| 1998 | 73°F | 45°F | 0" | -- |
| 1997 | 79°F | 44°F | 0.08" | -- |
| 1996 | 90°F | 54°F | 0" | -- |
| 1995 | 85°F | 42°F | 0" | -- |
| 1994 | 83°F | 44°F | 0" | -- |
| 1993 | 79°F | 49°F | 0.38" | -- |
| 1992 | 86°F | 46°F | 0" | -- |
| 1991 | 65°F | 47°F | 0.43" | -- |
| 1990 | 71°F | 45°F | 0.05" | -- |
| 1989 | 62°F | 40°F | 0.2" | -- |
| 1988 | 79°F | 47°F | 0" | -- |
| 1987 | 84°F | 52°F | 0" | -- |
| 1986 | 66°F | 44°F | 1.14" | -- |
| 1985 | 73°F | 36°F | 0" | -- |
| 1984 | 88°F | 53°F | 0" | -- |
| 1983 | 56°F | 36°F | 0.1" | -- |
| 1982 | 66°F | 38°F | 0" | -- |
| 1981 | 76°F | 43°F | 0" | -- |
| 1980 | 53°F | 47°F | 1.75" | -- |
| 1979 | 82°F | 46°F | 0" | -- |
| 1978 | 91°F | 50°F | 0" | -- |
| 1977 | 73°F | 45°F | 0.43" | -- |
| 1976 | 85°F | 42°F | 0.23" | -- |
| 1975 | 83°F | 46°F | 0" | -- |
| 1974 | 74°F | 41°F | 0" | -- |
| 1973 | 80°F | 37°F | 0" | -- |
| 1972 | 83°F | 41°F | 0" | -- |
| 1971 | 76°F | 45°F | 0" | -- |
Based on 55 years of data from NOAA station: GREELEY UNC
Monthly Climate Averages
Historical temperature and precipitation averages for Greeley, CO, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.