Mystic, CT weather in May
In May, Mystic sees highs around 66°F and lows around 50°F: mild, with frequent rain. Rain falls on about 12 days.
- Normal high
- 66°F
- Normal low
- 50°F
- Wet days
- 12
- 3.7 in total
- Muggy days
- 0
- dew point 65°F+
How May changes from start to finish
| May 1 | May 31 | |
|---|---|---|
| Normal high | 62°F | 71°F |
| Normal low | 46°F | 54°F |
| Chance of a wet day | 39% | 36% |
| Sunrise / sunset | 5:44 am / 7:44 pm | 5:17 am / 8:13 pm |
| Daylight | 14.0 h | 14.9 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical May day
- 6 am53°Fdew point 46°F
- 9 am61°Fdew point 46°F
- Noon65°Fdew point 46°F
- 3 pm66°Fdew point 47°F
- 6 pm62°Fdew point 46°F
- 9 pm56°Fdew point 47°F
NOAA hourly normals (local standard time) from Providence T F Green Airport (38 mi away); average wind 9 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°Fnot available
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph2 of 31
- Hot dayshigh 90°F or more0 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow12 of 31
- Notable rainat least 0.10 in7 of 31
- Freezing nightslow 32°F or below0 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per May, counted from daily records for each year 1991-2020.
Rain in May
Normal precipitation is 3.7 in; a dry May brings about 3.0 in and a wet one about 4.5 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more.
How May varies from year to year
- Warmest May, 1991-20201991: average high 74°F
- Coolest May1997: average high 62°F
- Wettest May1998: 5.5 in
- Driest May1993: 0.8 in
- Highest reading89°F (May 26, 2010)
- Lowest reading33°F (May 6, 1992)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
May compared with April and June
| April | May | June | |
|---|---|---|---|
| Normal high | 57°F | 66°F | 75°F |
| Normal low | 41°F | 50°F | 59°F |
| Wet days | 12 | 12 | 10 |
| Comfortable days | – | – | – |
| Daylight | 13.3 h | 14.5 h | 15.1 h |
Highs change by +9°F from April and +9°F into June.
Nearby alternatives in May
- Warmer: Springfield, MA61 mi · high 72°F · 12 wet days
- Cooler: Nantucket, MA97 mi · high 61°F · 12 wet days
How Mystic ranks in May
- Normal high325th warmest of 378 cities; 5th of 5 in Connecticut
- Wet days255th driest of 378
What to pack for Mystic in May
- A rain jacket or umbrella – rain on about 12 days
Heating and cooling
May has 227 heating degree days and 14 cooling degree days (base 65°F), 4% of the year's total heating and cooling demand.
Questions
How cold is Mystic in May?
The normal high is 66°F and the normal low is 50°F. From 1991 to 2020 the coldest May reading was 33°F (May 6, 1992).
Does it rain a lot in Mystic in May?
About 12 days in May have at least 0.01 in of precipitation, and the normal total is 3.7 in. The wettest May in 1991-2020 was in 1998 (5.5 in); the driest was in 1993 (0.8 in).
Where the numbers come from
- Temperature, rain, snowfall and snow depth: Groton (USC00063207), 3.7 mi W of the city center, 40 ft . NOAA normals and daily records, 1991-2020.
- Frost dates: Groton New London Airport (USW00014707), 4.7 mi WSW of the city center, 10 ft . NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Providence T F Green Airport (USW00014765), 38 mi NE of the city center, 60 ft (52 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Groton-New London Airport (725046-14707), 4.7 mi WSW of the city center, 8 ft . Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).