Hanover, New Hampshire climate: Normal weather by month, frost dates and records
Hanover's normal year runs from 13°F January nights to 83°F July afternoons, with 40.1 inches of precipitation and 61 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.8°C, January lows of −11°C, July highs of 29°C, 1,020 mm of precipitation a year.
- NOAA stationHanover
- Station IDUSC00273850
- Location43.71°N 72.29°W
- Elevation584 ft (178 m)
- Population (town)12,005
- Census place8,520
On October 22, the normal high in Hanover is 58°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 Hanover.
- Jan 30° 13°
- Feb 34° 14°
- Mar 44° 24°
- Apr 58° 35°
- May 71° 46°
- Jun 79° 55°
- Jul 83° 61°
- Aug 82° 59°
- Sep 74° 52°
- Oct 60° 40°
- Nov 47° 31°
- Dec 36° 20°
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 Hanover each month?
July is the warmest month, with normal highs of 83°F; January the coldest, with normal lows of 13°F. The most precipitation falls in July (4.48 in), the least in February (2.38 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 30°F | 13°F | 21.6°F | 2.73 | 16.4 | 11 | <1 | 30 | 9 h 20 min |
| February | 34°F | 14°F | 24.3°F | 2.38 | 13.1 | 9 | <1 | 27 | 10 h 30 min |
| March | 44°F | 24°F | 33.6°F | 2.96 | 13.5 | 10 | <1 | 26 | 11 h 50 min |
| April | 58°F | 35°F | 46.5°F | 3.24 | 1.9 | 11 | <1 | 14 | 13 h 20 min |
| May | 71°F | 46°F | 58.5°F | 3.34 | 0.0 | 12 | 1 | 2 | 14 h 40 min |
| June | 79°F | 55°F | 67.1°F | 3.70 | 0.0 | 12 | 2 | <1 | 15 h 30 min |
| July | 83°F | 61°F | 72.1°F | 4.48 | 0.0 | 13 | 4 | <1 | 15 h 10 min |
| August | 82°F | 59°F | 70.5°F | 3.55 | 0.0 | 11 | 2 | <1 | 14 h |
| September | 74°F | 52°F | 62.9°F | 3.33 | 0.0 | 11 | 1 | <1 | 12 h 30 min |
| October | 60°F | 40°F | 50.2°F | 4.00 | 0.1 | 12 | <1 | 7 | 11 h 10 min |
| November | 47°F | 31°F | 38.9°F | 3.00 | 2.2 | 10 | <1 | 19 | 9 h 40 min |
| December | 36°F | 20°F | 28.0°F | 3.44 | 13.4 | 11 | <1 | 27 | 9 h |
| Year (annual) | 58°F | 38°F | 47.9°F | 40.15 | 60.6 | 132 | 9 | 152 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −1°C | −11°C | −5.8°C | 69 mm | 42 cm |
| February | 1°C | −10°C | −4.3°C | 60 mm | 33 cm |
| March | 7°C | −5°C | 0.9°C | 75 mm | 34 cm |
| April | 15°C | 2°C | 8.1°C | 82 mm | 5 cm |
| May | 22°C | 8°C | 14.7°C | 85 mm | 0 cm |
| June | 26°C | 13°C | 19.5°C | 94 mm | 0 cm |
| July | 29°C | 16°C | 22.3°C | 114 mm | 0 cm |
| August | 28°C | 15°C | 21.4°C | 90 mm | 0 cm |
| September | 23°C | 11°C | 17.2°C | 85 mm | 0 cm |
| October | 16°C | 5°C | 10.1°C | 102 mm | 0 cm |
| November | 8°C | −1°C | 3.8°C | 76 mm | 6 cm |
| December | 2°C | −6°C | −2.2°C | 87 mm | 34 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00273850; 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 Hanover?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, August has the fewest days with rain (11).
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 USC00273850.
When is the last frost in Hanover?
In Hanover, the last spring frost (32°F) comes after May 1 in half of years and after May 15 in one year in ten; the first autumn frost comes before October 13 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 11 year in 10 after May 15; 9 in 10 after April 21
- First autumn frost, half of years before
- October 131 year in 10 before October 1; 9 in 10 before October 29
NOAA puts the median frost-free season at 162 days, and the season without a hard freeze (28°F) at 186 days.
A hard freeze (28°F) comes after April 19 in half of springs and before October 24 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Hanover in zone 5a in ZIP code 03755. By the map's own method, the average of each year's coldest night over 1991-2020, Hanover's NOAA station is in zone 5a: the coldest night of a typical year reaches −16°F (24 complete years).
Frost dates for every NOAA station in New Hampshire · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00273850; 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 Hanover?
In a normal year in Hanover, 9 days a year reach 90°F, 152 nights fall to 32°F or colder and 132 days bring measurable precipitation.
- Days at 90°F or more
- 9a 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
- 50high of 32°F or less
- Days with 0.01 inch of precipitation
- 132a normal year
- Days with 1 inch of snow or more
- 16a normal year
The highest temperature in this station's record (since 1893) is 103°F, on August 2, 1975; the lowest is −40°F, on February 16, 1943.
The wettest calendar year on that record is 2023, with 58.88 in; the snowiest season is 1957–58, with 117.7 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00273850; records: ACIS (NOAA Regional Climate Centers), station USC00273850. Records use complete months only; a month missing more than three days is left out.
How sunny is Hanover?
Over a year 69% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Hanover, 3.7 kWh per square metre a day. August is the sunniest month (76%) and December the cloudiest (57%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 63% | 1.6 |
| February | 67% | 2.5 |
| March | 68% | 3.7 |
| April | 67% | 4.6 |
| May | 67% | 5.2 |
| June | 69% | 5.6 |
| July | 75% | 5.8 |
| August | 76% | 5.2 |
| September | 75% | 4.2 |
| October | 64% | 2.6 |
| November | 64% | 1.7 |
| December | 57% | 1.2 |
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 Hanover need?
A normal year in Hanover brings 6,827 heating degree days, 27% more than the median U.S. place (5,373), and 622 cooling degree days, 31% 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 2,696 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,344 | 0 |
| February | 1,138 | 0 |
| March | 972 | 0 |
| April | 559 | 3 |
| May | 229 | 29 |
| June | 50 | 113 |
| July | 6 | 228 |
| August | 14 | 182 |
| September | 125 | 64 |
| October | 462 | 3 |
| November | 782 | 0 |
| December | 1,147 | 0 |
| Year (annual) | 6,827 | 622 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00273850. 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 Hanover been warmer than normal lately?
2025 averaged 47.6°F, 0.3°F below the 1991-2020 normal of 47.9°F. 2 of the 3 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 49.2°F | +1.3°F | 39.71 | – |
| 2023 | 49.8°F | +1.9°F | 58.88 | – |
| 2025 | 47.6°F | −0.3°F | – | – |
Over 133 complete years from 1835 to 2024, the station's annual mean temperature rose at a fitted 2.2°F per century (+0.12°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00273850; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Hanover's climate compare?
Hanover is warmer than 24 of the other 27 places with their own NOAA record in New Hampshire, and wetter than 4. Across the 7,247 U.S. stations with normals, its annual mean of 47.9°F is warmer than 31%.
In the Köppen classification computed from these normals, Hanover 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 Hanover 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.
- Wilder, VT3,394 people · 3 mi SW
- Norwich, VT3,627 people · 1 mi NW
- South Royalton, VT435 people · 13 mi NW
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 Hanover's climate
What is the coldest month in Hanover?
January, with a normal high of 30°F and a normal low of 13°F. The warmest is July (83°F by day, 61°F at night).
Does it snow in Hanover?
Yes: 61 inches in a normal year, falling on 28 days with 0.1 inch or more, the most in January (16.4 inches).
What is the rainiest month in Hanover?
July, with 4.48 in of precipitation in a normal year; the driest is February with 2.38 in.
What plant hardiness zone is Hanover in?
The USDA's 2023 map puts Hanover in zone 5a in ZIP code 03755. By the same method at Hanover's NOAA station, the coldest night of a typical year reaches −16°F (24 years, 1991-2020): zone 5a.
How late can frost come in Hanover?
In half of years the last 32°F night comes after May 1; in one year in ten it comes after May 15. Waiting until May 15 leaves about a one-in-ten chance of a later frost.
Nearby and next
- New Hampshire climateThe statewide normals and every place in the state
- Lebanon, NH6 miles from this station, 46.0°F a year
- Union Village Dam, VT6 miles from this station, 44.4°F a year
- North Hartland, VT8 miles from this station, 44.2°F a year
- Woodstock, VT12 miles from this station, 44.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made