Storrs, Connecticut climate: Normal weather by month, frost dates and records
Storrs's normal year runs from 19°F January nights to 81°F July afternoons, with 49.3 inches of precipitation and 39 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.8°C, January lows of −7°C, July highs of 27°C, 1,251 mm of precipitation a year.
- NOAA stationStorrs
- Station IDUSC00068138
- Location41.80°N 72.23°W
- Elevation665 ft (203 m)
- From the center2 miles
- Population (census place)13,502
On October 22, the normal high in Storrs is 59°F and the normal low 41°F, and the chance of measurable rain or snow is 33%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Storrs.
- Jan 35° 19°
- Feb 37° 20°
- Mar 45° 28°
- Apr 57° 38°
- May 68° 48°
- Jun 76° 57°
- Jul 81° 63°
- Aug 79° 61°
- Sep 73° 54°
- Oct 61° 43°
- Nov 50° 34°
- Dec 40° 25°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Storrs each month?
July is the warmest month, with normal highs of 81°F; January the coldest, with normal lows of 19°F. The most precipitation falls in October (4.58 in), the least in February (2.99 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 35°F | 19°F | 26.9°F | 3.65 | 8.3 | 10 | <1 | 27 | 9 h 30 min |
| February | 37°F | 20°F | 28.8°F | 2.99 | 14.1 | 9 | <1 | 25 | 10 h 30 min |
| March | 45°F | 28°F | 36.3°F | 4.38 | 6.3 | 10 | <1 | 22 | 11 h 50 min |
| April | 57°F | 38°F | 47.5°F | 4.23 | 1.7 | 11 | <1 | 7 | 13 h 20 min |
| May | 68°F | 48°F | 57.7°F | 3.73 | 0.0 | 13 | <1 | <1 | 14 h 30 min |
| June | 76°F | 57°F | 66.3°F | 4.52 | 0.0 | 11 | <1 | <1 | 15 h 10 min |
| July | 81°F | 63°F | 71.7°F | 4.01 | 0.0 | 11 | 2 | <1 | 15 h |
| August | 79°F | 61°F | 70.0°F | 4.30 | 0.0 | 10 | 1 | <1 | 13 h 50 min |
| September | 73°F | 54°F | 63.4°F | 4.48 | 0.0 | 9 | <1 | <1 | 12 h 30 min |
| October | 61°F | 43°F | 52.1°F | 4.58 | 0.3 | 11 | <1 | 3 | 11 h 10 min |
| November | 50°F | 34°F | 42.1°F | 3.90 | 1.1 | 9 | <1 | 13 | 9 h 50 min |
| December | 40°F | 25°F | 32.7°F | 4.50 | 7.2 | 10 | <1 | 24 | 9 h 10 min |
| Year (annual) | 58°F | 41°F | 49.6°F | 49.27 | 39.0 | 123 | 3 | 123 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 2°C | −7°C | −2.8°C | 93 mm | 21 cm |
| February | 3°C | −6°C | −1.8°C | 76 mm | 36 cm |
| March | 7°C | −2°C | 2.4°C | 111 mm | 16 cm |
| April | 14°C | 3°C | 8.6°C | 107 mm | 4 cm |
| May | 20°C | 9°C | 14.3°C | 95 mm | 0 cm |
| June | 24°C | 14°C | 19.1°C | 115 mm | 0 cm |
| July | 27°C | 17°C | 22.1°C | 102 mm | 0 cm |
| August | 26°C | 16°C | 21.1°C | 109 mm | 0 cm |
| September | 23°C | 12°C | 17.4°C | 114 mm | 0 cm |
| October | 16°C | 6°C | 11.2°C | 116 mm | 1 cm |
| November | 10°C | 1°C | 5.6°C | 99 mm | 3 cm |
| December | 5°C | −4°C | 0.4°C | 114 mm | 18 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00068138; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Storrs?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, September has the fewest days with rain (9).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00068138.
When is the last frost in Storrs?
In Storrs, the last spring frost (32°F) comes after April 19 in half of years and after May 3 in one year in ten; the first autumn frost comes before October 22 in half of years and before October 6 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 191 year in 10 after May 3; 9 in 10 after April 7
- First autumn frost, half of years before
- October 221 year in 10 before October 6; 9 in 10 before November 6
NOAA puts the median frost-free season at 186 days, and the season without a hard freeze (28°F) at 211 days.
A hard freeze (28°F) comes after April 6 in half of springs and before November 4 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Storrs in zone 6b across its 2 ZIP code areas (6b in 06268, the largest). By the map's own method, the average of each year's coldest night over 1991-2020, Storrs's NOAA station is in zone 6b: the coldest night of a typical year reaches −3°F (22 complete years).
Frost dates for every NOAA station in Connecticut · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00068138; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
What hardiness zone is each Storrs ZIP code in?
The USDA's 2023 map gives each ZIP code area one zone. Storrs's 2 ZIP code areas are all in zone 6b. Each ZIP's frost dates are in the frost tool.
Source: USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; ZIP areas in the place: Census Bureau 2020 ZCTA-to-place relationship file. A ZIP area counts when at least a tenth of its land (and 0.5 km²) lies in the place.
How hot and how cold does it get in Storrs?
In a normal year in Storrs, 3 days a year reach 90°F, 123 nights fall to 32°F or colder and 123 days bring measurable precipitation.
- Days at 90°F or more
- 3a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 123a normal year
- Days that stay below freezing
- 36high of 32°F or less
- Days with 0.01 inch of precipitation
- 123a normal year
- Days with 1 inch of snow or more
- 11a normal year
The highest temperature in this station's record (since 1888) is 101°F, on July 6, 1919; the lowest is −20°F, on February 9, 1934.
The wettest calendar year on that record is 2023, with 67.90 in; the snowiest season is 2014–15, with 74.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00068138; records: ACIS (NOAA Regional Climate Centers), station USC00068138. Records use complete months only; a month missing more than three days is left out.
How sunny is Storrs?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Storrs, 3.9 kWh per square metre a day. July is the sunniest month (79%) and December the cloudiest (67%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 70% | 1.9 |
| February | 70% | 2.7 |
| March | 69% | 3.7 |
| April | 71% | 4.9 |
| May | 70% | 5.5 |
| June | 74% | 5.9 |
| July | 79% | 6.0 |
| August | 79% | 5.3 |
| September | 78% | 4.4 |
| October | 71% | 2.9 |
| November | 72% | 2.1 |
| December | 67% | 1.5 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Storrs need?
A normal year in Storrs brings 6,141 heating degree days, 14% more than the median U.S. place (5,373), and 569 cooling degree days, 37% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,683 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,181 | 0 |
| February | 1,014 | 0 |
| March | 890 | 0 |
| April | 529 | 4 |
| May | 249 | 21 |
| June | 60 | 99 |
| July | 6 | 212 |
| August | 13 | 168 |
| September | 110 | 62 |
| October | 404 | 4 |
| November | 686 | 0 |
| December | 1,001 | 0 |
| Year (annual) | 6,141 | 569 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00068138. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Storrs been warmer than normal lately?
2025 averaged 49.4°F, 0.2°F below the 1991-2020 normal of 49.6°F. 3 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 50.4°F | +0.8°F | 55.99 | 24.8 |
| 2022 | 49.4°F | −0.2°F | 47.05 | – |
| 2023 | 50.9°F | +1.3°F | 67.90 | – |
| 2024 | 50.8°F | +1.2°F | 56.15 | – |
| 2025 | 49.4°F | −0.2°F | 48.19 | – |
Over 96 complete years from 1890 to 2025, the station's annual mean temperature rose at a fitted 3.4°F per century (+0.19°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00068138; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Storrs's climate compare?
Storrs is warmer than 2 of the other 12 places with their own NOAA record in Connecticut, and wetter than 8. Across the 7,247 U.S. stations with normals, its annual mean of 49.6°F is warmer than 38%.
In the Köppen classification computed from these normals, Storrs is Dfa: continental, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Storrs share this climate record?
3 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Rockville, CT6,657 people · 12 mi NW
- Coventry Lake, CT2,358 people · 6 mi W
- South Coventry, CT1,509 people · 5 mi SW
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Storrs's climate
What is the coldest month in Storrs?
January, with a normal high of 35°F and a normal low of 19°F. The warmest is July (81°F by day, 63°F at night).
Does it snow in Storrs?
Yes: 39 inches in a normal year, falling on 14 days with 0.1 inch or more, the most in February (14.1 inches).
What is the rainiest month in Storrs?
October, with 4.58 in of precipitation in a normal year; the driest is February with 2.99 in.
What plant hardiness zone is Storrs in?
The USDA's 2023 map puts Storrs in zone 6b across its 2 ZIP code areas (6b in 06268, the largest). By the same method at Storrs's NOAA station, the coldest night of a typical year reaches −3°F (22 years, 1991-2020): zone 6b.
How late can frost come in Storrs?
In half of years the last 32°F night comes after April 19; in one year in ten it comes after May 3. Waiting until May 3 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Connecticut climateThe statewide normals and every place in the state
- Willimantic, CT4 miles from this station, 49.9°F a year
- Hampton, CT9 miles from this station, 48.6°F a year
- Staffordville, CT14 miles from this station, 47.1°F a year
- West Thompson Lake, CT20 miles from this station, 48.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made