Norfolk, Connecticut climate: Normal weather by month, frost dates and records
Norfolk's normal year runs from 14°F January nights to 78°F July afternoons, with 52.9 inches of precipitation and 75 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.7°C, January lows of −10°C, July highs of 26°C, 1,345 mm of precipitation a year.
- NOAA stationNorfolk (2 mi SW)
- Station IDUSC00065445
- Location41.97°N 73.22°W
- Elevation1,340 ft (408 m)
- From the center2 miles
- Population (town)1,601
- Census place608
On October 22, the normal high in Norfolk is 54°F and the normal low 38°F, and the chance of measurable rain or snow is 38%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Norfolk.
- Jan 30° 14°
- Feb 32° 15°
- Mar 40° 23°
- Apr 54° 34°
- May 65° 45°
- Jun 73° 55°
- Jul 78° 60°
- Aug 76° 58°
- Sep 69° 51°
- Oct 57° 40°
- Nov 45° 30°
- Dec 35° 21°
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 Norfolk each month?
July is the warmest month, with normal highs of 78°F; January the coldest, with normal lows of 14°F. The most precipitation falls in October (5.14 in), the least in February (3.33 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 30°F | 14°F | 21.9°F | 3.97 | 17.8 | 13 | <1 | 29 | 9 h 30 min |
| February | 32°F | 15°F | 23.9°F | 3.33 | 17.5 | 12 | <1 | 27 | 10 h 30 min |
| March | 40°F | 23°F | 31.6°F | 4.21 | 14.9 | 12 | <1 | 26 | 11 h 50 min |
| April | 54°F | 34°F | 44.0°F | 3.93 | 3.9 | 13 | <1 | 14 | 13 h 20 min |
| May | 65°F | 45°F | 55.3°F | 4.13 | 0.0 | 14 | <1 | 1 | 14 h 30 min |
| June | 73°F | 55°F | 64.0°F | 4.96 | 0.0 | 13 | <1 | <1 | 15 h 10 min |
| July | 78°F | 60°F | 69.0°F | 4.77 | 0.0 | 12 | 1 | <1 | 15 h |
| August | 76°F | 58°F | 67.3°F | 4.67 | 0.0 | 11 | <1 | <1 | 14 h |
| September | 69°F | 51°F | 60.0°F | 4.90 | 0.0 | 10 | <1 | <1 | 12 h 30 min |
| October | 57°F | 40°F | 48.1°F | 5.14 | 1.4 | 12 | <1 | 7 | 11 h 10 min |
| November | 45°F | 30°F | 37.5°F | 4.07 | 4.4 | 11 | <1 | 19 | 9 h 50 min |
| December | 35°F | 21°F | 27.9°F | 4.86 | 15.0 | 14 | <1 | 28 | 9 h 10 min |
| Year (annual) | 55°F | 37°F | 45.9°F | 52.94 | 74.9 | 148 | 1 | 152 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −1°C | −10°C | −5.6°C | 101 mm | 45 cm |
| February | 0°C | −9°C | −4.5°C | 85 mm | 44 cm |
| March | 5°C | −5°C | −0.2°C | 107 mm | 38 cm |
| April | 12°C | 1°C | 6.7°C | 100 mm | 10 cm |
| May | 19°C | 7°C | 12.9°C | 105 mm | 0 cm |
| June | 23°C | 13°C | 17.8°C | 126 mm | 0 cm |
| July | 26°C | 15°C | 20.6°C | 121 mm | 0 cm |
| August | 25°C | 15°C | 19.6°C | 119 mm | 0 cm |
| September | 21°C | 11°C | 15.6°C | 124 mm | 0 cm |
| October | 14°C | 4°C | 8.9°C | 131 mm | 4 cm |
| November | 7°C | −1°C | 3.1°C | 103 mm | 11 cm |
| December | 1°C | −6°C | −2.3°C | 123 mm | 38 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00065445; 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 Norfolk?
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 (10).
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 USC00065445.
When is the last frost in Norfolk?
In Norfolk, the last spring frost (32°F) comes after May 3 in half of years and after May 17 in one year in ten; the first autumn frost comes before October 11 in half of years and before October 1 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
- May 31 year in 10 after May 17; 9 in 10 after April 21
- First autumn frost, half of years before
- October 111 year in 10 before October 1; 9 in 10 before October 28
NOAA puts the median frost-free season at 161 days, and the season without a hard freeze (28°F) at 187 days.
A hard freeze (28°F) comes after April 20 in half of springs and before October 25 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Norfolk in zone 6a in ZIP code 06058, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Norfolk's NOAA station is in zone 6a: the coldest night of a typical year reaches −9°F (26 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 USC00065445; 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.
How hot and how cold does it get in Norfolk?
In a normal year in Norfolk, 1 day a year reaches 90°F, 152 nights fall to 32°F or colder and 148 days bring measurable precipitation.
- Days at 90°F or more
- 1a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 152a normal year
- Days that stay below freezing
- 55high of 32°F or less
- Days with 0.01 inch of precipitation
- 148a normal year
- Days with 1 inch of snow or more
- 20a normal year
The highest temperature in this station's record (since 1884) is 94°F, on July 3, 2026; the lowest is −25°F, on February 17, 1943.
The wettest calendar year on that record is 2011, with 76.94 in; the snowiest season is 1955–56, with 177.4 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00065445; records: ACIS (NOAA Regional Climate Centers), station USC00065445. Records use complete months only; a month missing more than three days is left out.
How sunny is Norfolk?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Norfolk, 3.9 kWh per square metre a day. July is the sunniest month (79%) and December the cloudiest (65%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 68% | 1.8 |
| February | 70% | 2.7 |
| March | 68% | 3.7 |
| April | 69% | 4.8 |
| May | 69% | 5.4 |
| June | 74% | 5.9 |
| July | 79% | 6.0 |
| August | 78% | 5.3 |
| September | 77% | 4.3 |
| October | 70% | 2.9 |
| November | 70% | 2.0 |
| December | 65% | 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 Norfolk need?
A normal year in Norfolk brings 7,311 heating degree days, 36% more than the median U.S. place (5,373), and 370 cooling degree days, 59% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,192 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,334 | 0 |
| February | 1,152 | 0 |
| March | 1,035 | 0 |
| April | 633 | 3 |
| May | 315 | 16 |
| June | 98 | 66 |
| July | 20 | 143 |
| August | 38 | 108 |
| September | 185 | 33 |
| October | 526 | 2 |
| November | 824 | 0 |
| December | 1,152 | 0 |
| Year (annual) | 7,311 | 370 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00065445. 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 Norfolk been warmer than normal lately?
2025 averaged 46.6°F, 0.7°F above the 1991-2020 normal of 45.9°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 47.3°F | +1.4°F | 60.00 | 59.1 |
| 2022 | 46.9°F | +1.0°F | 48.78 | 52.1 |
| 2023 | 48.4°F | +2.5°F | 69.01 | 56.3 |
| 2024 | 48.6°F | +2.7°F | 51.56 | 53.1 |
| 2025 | 46.6°F | +0.7°F | 46.25 | 50.4 |
Over 67 complete years from 1948 to 2025, the station's annual mean temperature rose at a fitted 4.4°F per century (+0.24°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00065445; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Norfolk's climate compare?
Norfolk is warmer than 0 of the other 12 places with their own NOAA record in Connecticut, and wetter than 12. Across the 7,247 U.S. stations with normals, its annual mean of 45.9°F is warmer than 23%.
In the Köppen classification computed from these normals, Norfolk is Dfb: continental, no dry season, warm 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.
Questions about Norfolk's climate
What is the coldest month in Norfolk?
January, with a normal high of 30°F and a normal low of 14°F. The warmest is July (78°F by day, 60°F at night).
Does it snow in Norfolk?
Yes: 75 inches in a normal year, falling on 38 days with 0.1 inch or more, the most in January (17.8 inches).
What is the rainiest month in Norfolk?
October, with 5.14 in of precipitation in a normal year; the driest is February with 3.33 in.
What plant hardiness zone is Norfolk in?
The USDA's 2023 map puts Norfolk in zone 6a in ZIP code 06058, the nearest ZIP area. By the same method at Norfolk's NOAA station, the coldest night of a typical year reaches −9°F (26 years, 1991-2020): zone 6a.
How late can frost come in Norfolk?
In half of years the last 32°F night comes after May 3; in one year in ten it comes after May 17. Waiting until May 17 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Connecticut climateThe statewide normals and every place in the state
- Falls Village, CT7 miles from this station, 48.4°F a year
- Barkhamsted, CT14 miles from this station, 48.5°F a year
- Bakersville, CT14 miles from this station, 47.3°F a year
- Burlington, CT19 miles from this station, 50.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made