Basilemorin / CC0
Hartford, CT Weather on May 15
May 15th in Hartford, CT typically brings pleasant spring weather, with average highs around 71°F and lows near 49°F. Over 55 years of records, the warmest May 15th was in 2004 (73°F average), while the coldest was 1984 (47°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 35% of May 15th dates historically, with the wettest May 15th recording 3.94" of rain. The last decade has been 6.4°F warmer on this date compared to 20-30 years ago.
What to Expect on May 15
Planning for May 15th in Hartford, CT? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
May 15 Weather Records for Hartford
- •The all-time record high for May 15th in Hartford, CT is 86°F, set in 2004.
- •The coldest May 15th on record dropped to 29°F in 1997.
- •A freeze (32°F or below) has occurred on May 15th in 2 of the last 55 years.
- •Last year (1971), May 15th was 5°F cooler than the long-term average.
Frequently Asked Questions
What was the warmest May 15 ever in Hartford?
The warmest May 15 in Hartford, CT reached 86°F in 2004. That is 15°F above the long-term average high of 71°F.
What was the coldest May 15 ever in Hartford?
The coldest May 15 in Hartford, CT dropped to 29°F in 1997. That is 20°F below the long-term average low of 49°F.
What is the average temperature on May 15 in Hartford?
On May 15, Hartford averages a high of 71°F and a low of 49°F based on 55 years of NOAA weather observations from HARTFORD BRAINARD FLD.
How many years of weather data are available for May 15 in Hartford?
We have 55 years of weather records for May 15 in Hartford, CT, 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 Hartford
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 73°F | 62°F | 0.46" | -- |
| 2024 | 66°F | 60°F | 1.02" | -- |
| 2023 | 76°F | 41°F | 0" | -- |
| 2022 | 82°F | 65°F | 0.15" | -- |
| 2021 | 79°F | 48°F | 0" | -- |
| 2020 | 81°F | 54°F | 2.21" | -- |
| 2019 | 67°F | 46°F | 0.13" | -- |
| 2018 | 82°F | 58°F | 1.78" | -- |
| 2017 | 66°F | 52°F | 0.15" | -- |
| 2016 | 60°F | 46°F | 0" | -- |
| 2015 | 74°F | 45°F | 0" | -- |
| 2014 | 76°F | 59°F | 0.25" | -- |
| 2013 | 63°F | 35°F | 0" | -- |
| 2012 | 70°F | 60°F | 2.16" | -- |
| 2011 | 68°F | 53°F | 1.75" | -- |
| 2010 | 72°F | 55°F | 0" | -- |
| 2009 | 78°F | 57°F | 0" | -- |
| 2008 | 67°F | 51°F | 0" | -- |
| 2007 | 83°F | 52°F | 0" | -- |
| 2006 | 57°F | 48°F | 0.41" | -- |
| 2005 | 73°F | 54°F | 0.84" | -- |
| 2004 | 86°F | 60°F | 0" | -- |
| 2003 | 70°F | 49°F | 0" | -- |
| 2002 | 66°F | 42°F | 0" | -- |
| 2001 | 66°F | 40°F | 0" | -- |
| 2000 | 63°F | 46°F | 0" | -- |
| 1999 | 69°F | 44°F | 0" | -- |
| 1998 | 76°F | 39°F | 0" | -- |
| 1997 | 70°F | 29°F | 0" | -- |
| 1996 | 62°F | 32°F | 0" | -- |
| 1995 | 59°F | 49°F | 0.56" | -- |
| 1994 | 76°F | 52°F | 1.12" | -- |
| 1993 | 72°F | 53°F | 0" | -- |
| 1992 | 74°F | 52°F | 0.56" | -- |
| 1991 | 78°F | 56°F | 0" | -- |
| 1990 | 73°F | 52°F | 0" | -- |
| 1989 | 69°F | 49°F | 0" | -- |
| 1988 | 70°F | 45°F | 0" | -- |
| 1987 | 69°F | 42°F | 0" | -- |
| 1986 | 77°F | 41°F | 0" | -- |
| 1985 | 78°F | 47°F | 0" | -- |
| 1984 | 59°F | 35°F | 0" | -- |
| 1983 | 74°F | 50°F | 0.08" | -- |
| 1982 | 74°F | 43°F | 0" | -- |
| 1981 | 75°F | 55°F | 0" | -- |
| 1980 | 73°F | 41°F | 0" | -- |
| 1979 | 63°F | 54°F | 0.58" | -- |
| 1978 | 67°F | 45°F | 3.94" | -- |
| 1977 | 66°F | 36°F | 0" | -- |
| 1976 | 75°F | 60°F | 0" | -- |
| 1975 | 79°F | 55°F | 0" | -- |
| 1974 | 72°F | 43°F | 0" | -- |
| 1973 | 69°F | 49°F | 0" | -- |
| 1972 | 69°F | 54°F | 2.51" | -- |
| 1971 | 66°F | 35°F | 0" | -- |
Based on 55 years of data from NOAA station: HARTFORD BRAINARD FLD
Monthly Climate Averages
Historical temperature and precipitation averages for Hartford, CT, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.