Hudson, New Hampshire climate: Normal weather by month, frost dates and records
Hudson's normal year runs from 13°F January nights to 83°F July afternoons, with 46.1 inches of precipitation and 67 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, 1,170 mm of precipitation a year.
- NOAA stationHudson (1 mi SSE)
- Station IDUSC00274234
- Location42.78°N 71.41°W
- Elevation185 ft (56 m)
- From the center2 miles
- Population (town)25,787
- Census place7,105
On October 23, the normal high in Hudson is 58°F and the normal low 35°F, and the chance of measurable rain or snow is 36%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Hudson.
- Jan 34° 13°
- Feb 37° 14°
- Mar 45° 23°
- Apr 58° 34°
- May 69° 46°
- Jun 78° 56°
- Jul 83° 61°
- Aug 82° 59°
- Sep 74° 51°
- Oct 61° 38°
- Nov 49° 28°
- Dec 39° 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 Hudson 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 October (4.66 in), the least in February (3.21 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 34°F | 13°F | 23.2°F | 3.31 | 17.1 | 12 | <1 | 30 | 9 h 20 min |
| February | 37°F | 14°F | 25.0°F | 3.21 | 16.3 | 11 | <1 | 27 | 10 h 30 min |
| March | 45°F | 23°F | 33.8°F | 4.22 | 14.6 | 12 | <1 | 26 | 11 h 50 min |
| April | 58°F | 34°F | 46.0°F | 4.06 | 2.8 | 12 | <1 | 15 | 13 h 20 min |
| May | 69°F | 46°F | 57.3°F | 3.64 | 0.0 | 13 | 1 | 2 | 14 h 40 min |
| June | 78°F | 56°F | 66.7°F | 4.16 | 0.0 | 12 | 3 | <1 | 15 h 20 min |
| July | 83°F | 61°F | 72.3°F | 3.32 | 0.0 | 11 | 6 | <1 | 15 h |
| August | 82°F | 59°F | 70.5°F | 3.75 | 0.0 | 11 | 4 | <1 | 14 h |
| September | 74°F | 51°F | 62.5°F | 3.68 | 0.0 | 10 | 1 | 1 | 12 h 30 min |
| October | 61°F | 38°F | 49.7°F | 4.66 | 0.6 | 11 | <1 | 11 | 11 h 10 min |
| November | 49°F | 28°F | 38.8°F | 3.70 | 2.0 | 11 | <1 | 22 | 9 h 50 min |
| December | 39°F | 20°F | 29.3°F | 4.35 | 13.4 | 12 | <1 | 29 | 9 h |
| Year (annual) | 59°F | 37°F | 47.9°F | 46.06 | 66.8 | 137 | 14 | 162 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 1°C | −11°C | −4.9°C | 84 mm | 43 cm |
| February | 3°C | −10°C | −3.9°C | 82 mm | 41 cm |
| March | 7°C | −5°C | 1.0°C | 107 mm | 37 cm |
| April | 14°C | 1°C | 7.8°C | 103 mm | 7 cm |
| May | 21°C | 8°C | 14.1°C | 92 mm | 0 cm |
| June | 25°C | 13°C | 19.3°C | 106 mm | 0 cm |
| July | 29°C | 16°C | 22.4°C | 84 mm | 0 cm |
| August | 28°C | 15°C | 21.4°C | 95 mm | 0 cm |
| September | 23°C | 10°C | 16.9°C | 93 mm | 0 cm |
| October | 16°C | 3°C | 9.8°C | 118 mm | 2 cm |
| November | 10°C | −2°C | 3.8°C | 94 mm | 5 cm |
| December | 4°C | −7°C | −1.5°C | 110 mm | 34 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00274234; 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 Hudson?
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 USC00274234.
When is the last frost in Hudson?
In Hudson, the last spring frost (32°F) comes after May 3 in half of years and after May 16 in one year in ten; the first autumn frost comes before October 8 in half of years and before September 27 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 16; 9 in 10 after April 24
- First autumn frost, half of years before
- October 81 year in 10 before September 27; 9 in 10 before October 23
NOAA puts the median frost-free season at 156 days, and the season without a hard freeze (28°F) at 179 days.
A hard freeze (28°F) comes after April 22 in half of springs and before October 18 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Hudson in zone 6a in ZIP code 03051. By the map's own method, the average of each year's coldest night over 1991-2020, Hudson's NOAA station is in zone 5b: the coldest night of a typical year reaches −10°F (29 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in New Hampshire · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00274234; 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 Hudson?
In a normal year in Hudson, 14 days a year reach 90°F, 162 nights fall to 32°F or colder and 137 days bring measurable precipitation.
- Days at 90°F or more
- 14a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 162a normal year
- Days that stay below freezing
- 35high of 32°F or less
- Days with 0.01 inch of precipitation
- 137a normal year
- Days with 1 inch of snow or more
- 16a normal year
The highest temperature in this station's record (since 1985) is 102°F, on July 15, 1995; the lowest is −23°F, on January 27, 1994.
The wettest calendar year on that record is 2023, with 63.98 in; the snowiest season is 1995–96, with 128.8 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00274234; records: ACIS (NOAA Regional Climate Centers), station USC00274234. Records use complete months only; a month missing more than three days is left out.
How sunny is Hudson?
Over a year 72% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Hudson, 3.8 kWh per square metre a day. August is the sunniest month (78%) and December the cloudiest (66%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 69% | 1.8 |
| February | 70% | 2.7 |
| March | 69% | 3.7 |
| April | 69% | 4.7 |
| May | 68% | 5.3 |
| June | 71% | 5.7 |
| July | 78% | 6.0 |
| August | 78% | 5.3 |
| September | 77% | 4.3 |
| October | 68% | 2.8 |
| November | 70% | 2.0 |
| December | 66% | 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 Hudson need?
A normal year in Hudson brings 6,815 heating degree days, 27% more than the median U.S. place (5,373), and 625 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 2,631 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,296 | 0 |
| February | 1,120 | 0 |
| March | 967 | 0 |
| April | 573 | 3 |
| May | 264 | 25 |
| June | 63 | 112 |
| July | 7 | 233 |
| August | 16 | 185 |
| September | 138 | 63 |
| October | 480 | 4 |
| November | 786 | 0 |
| December | 1,107 | 0 |
| Year (annual) | 6,815 | 625 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00274234. 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 Hudson been warmer than normal lately?
2025 averaged 48.3°F, 0.4°F above the 1991-2020 normal of 47.9°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 49.9°F | +2.0°F | 55.34 | 36.3 |
| 2022 | 49.6°F | +1.8°F | 39.82 | 42.1 |
| 2023 | 50.5°F | +2.6°F | 63.98 | 43.3 |
| 2024 | 50.5°F | +2.6°F | 43.80 | 35.2 |
| 2025 | 48.3°F | +0.4°F | 42.17 | 47.8 |
Over 38 complete years from 1986 to 2025, the station's annual mean temperature rose at a fitted 6.4°F per century (+0.36°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00274234; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Hudson's climate compare?
Hudson is warmer than 24 of the other 27 places with their own NOAA record in New Hampshire, and wetter than 16. 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, Hudson 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.
Questions about Hudson's climate
What is the coldest month in Hudson?
January, with a normal high of 34°F and a normal low of 13°F. The warmest is July (83°F by day, 61°F at night).
Does it snow in Hudson?
Yes: 67 inches in a normal year, falling on 30 days with 0.1 inch or more, the most in January (17.1 inches).
What is the rainiest month in Hudson?
October, with 4.66 in of precipitation in a normal year; the driest is February with 3.21 in.
What plant hardiness zone is Hudson in?
The USDA's 2023 map puts Hudson in zone 6a in ZIP code 03051. By the same method at Hudson's NOAA station, the coldest night of a typical year reaches −10°F (29 years, 1991-2020): zone 5b.
How late can frost come in Hudson?
In half of years the last 32°F night comes after May 3; in one year in ten it comes after May 16. Waiting until May 16 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
- Nashua, NH5 miles from this station, 48.7°F a year
- Lowell, MA10 miles from this station, 49.0°F a year
- Manchester, NH11 miles from this station, 50.1°F a year
- East Milford, NH11 miles from this station, 47.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made