Grafton, NH Climate: Temperature & Rain by Month
Annual temperature and rainfall from NOAA NCEI's 1991–2020 normals →; comfort score computed by PlainClimate
30-year climate normals (1991-2020) from Grafton's primary NOAA station, GRAFTON.
The climate verdict for Grafton
Grafton, New Hampshire has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 43°F. At 52/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 24% of scores.
- 43°F
- average temperature, NOAA 1991-2020 normal
- 52/100
- comfort score, above 24% of station-mapped location scores
- 40.2"
- annual precipitation
- 128 days
- growing season, frost-free days
Grafton: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00273530 · Grafton, NH 43°F mean · 40.2" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 43°F
- RANK-COOL #823
- PHOTO-FINISH ≈ Zortman
- PRCP-MID 40.2"
- SWING-WIDE 49°F
- COMF-LOW 52/100
- LOAD-HEAT 8,180 HDD
- STN-1 USC00273530
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Zortman, MT (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every NH station list.
- Grafton (this station) 43°F
- Cold Big Moose, NY 43°F
- Hot Hartford, ME 43°F
- Near Zortman, MT 43°F
- Near Worcester, VT 43°F
Climate Living Index · Grafton
Grafton: 29/100 · grade F
Grafton publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Grafton, not an official NOAA rating. Rankings still use Comfort Score 52/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 40.2 in · 5.2 from 35 in | 82/100 · B |
| Normal heat + freeze calendar | 191 calendar days | 19/100 · F |
| Annual temperature balance | 43.2°F · 24.3° from 67.5°F | 13/100 · F |
| Frost-free season | 128 days/year | 11/100 · F |
Grafton · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Grafton is a continental Köppen climate: Dfb
Coldest-month mean 18.2°F and warmest-month mean 66.8°F place this station in continental, no dry season, warm summer climates (Dfb). Class Dfb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, no dry season, warm summer.
- Köppen code
- Dfb
- Group
- Continental
- Warmest month
- 66.8°F
- Coldest month
- 18.2°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Grafton sits across the climate record
Three NOAA fields for Grafton's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 88%
- Among 6,861 stations, Grafton sits in the cooler third of annual means.
- Annual precipitation
- 58th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Wider than 76%
- Warmest-to-coldest month gap for Grafton is large versus 6,861 complete station-years.
How Grafton compares across U.S. station-mapped locations
Grafton's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
52 24th percentile score exceeds 24% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). This entry sits in this band.
- 60–70: 1,236 station-mapped locations (20%). Above this entry.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 29°F (-2°C) | 7°F (-14°C) | 18°F (-8°C) | 2.9" | 30.7 | 0.0 |
| February | 32°F (0°C) | 7°F (-14°C) | 20°F (-7°C) | 2.5" | 27.4 | 0.0 |
| March | 40°F (5°C) | 17°F (-8°C) | 29°F (-2°C) | 3.0" | 29.7 | 0.0 |
| April | 54°F (12°C) | 28°F (-2°C) | 41°F (5°C) | 3.2" | 22.9 | 0.1 |
| May | 66°F (19°C) | 40°F (4°C) | 53°F (12°C) | 3.2" | 8.8 | 0.0 |
| June | 75°F (24°C) | 50°F (10°C) | 62°F (17°C) | 4.2" | 0.7 | 1.2 |
| July | 80°F (26°C) | 54°F (12°C) | 67°F (19°C) | 3.9" | 0.0 | 1.7 |
| August | 78°F (25°C) | 53°F (12°C) | 66°F (19°C) | 3.3" | 0.0 | 1.5 |
| September | 71°F (22°C) | 45°F (7°C) | 58°F (14°C) | 3.2" | 5.2 | 0.3 |
| October | 58°F (14°C) | 33°F (0°C) | 45°F (7°C) | 4.5" | 19.6 | 0.0 |
| November | 45°F (7°C) | 25°F (-4°C) | 35°F (2°C) | 3.1" | 24.2 | 0.0 |
| December | 34°F (1°C) | 15°F (-9°C) | 25°F (-4°C) | 3.0" | 29.9 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 80°F around July 8, short of 90°F on every date, while 191 dates carry a normal low at or below freezing, the coldest 5°F near January 31.
The freezing stretch
The normal low stays at or below 32°F into April 25, then returns to freezing around October 18, covering 191 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
Where the wet dates fall
The likeliest wet date is January 6, when 40% of years recorded at least a hundredth of an inch. The driest is August 25 at 25%. Summed across the calendar, that is about 123 wet dates a year.
The widest day
September 29 carries the biggest normal gap between afternoon and dawn, 27°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Grafton.
Where Grafton Stands Nationally
Freezing is routine here by normals standards — the normal low reaches 32°F or colder on about 191 nights a year, more than most ranked stations.
Grafton earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall
12.4 days with precipitation
9.3 days with precipitation
11.2 days with precipitation
10.2 days with precipitation
9.9 days with precipitation
10.4 days with precipitation
9.9 days with precipitation
7.7 days with precipitation
9.9 days with precipitation
9.4 days with precipitation
11.3 days with precipitation
11.4 days with precipitation
Grafton spreads its precipitation across the year
Neither half of the year dominates here: June through August take 28% of the annual total and December through February 21%, with neither reaching the 35% that would mark a distinct wet season. Grafton has no dry season to plan around, though it does carry a wide 48.6°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: October averages 4.5" and February 2.5". The three wettest months together take 31% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
How Grafton's precipitation splits across the calendar
About 123 days a year record measurable precipitation here, carrying 40.2" between them, or roughly 0.33 inches on a typical wet day. That sits in the middle band: neither the many-light-days pattern of the Pacific Northwest and the Great Lakes, nor the few-heavy-events pattern of the Gulf and the desert Southwest.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Frost Dates & Growing Season
First Fall Freeze
September 26
50% probability date
Last Spring Freeze
May 21
50% probability date
Growing Season
128 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
8,180
Higher = more heating needed
Cooling Degree Days
261
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside NH closest to Grafton on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (43°F here).
- Beulah, ND 43°F · 0.0°F off
- Ellendale, ND 43°F · 0.0°F off
- Livermore Falls, ME 43°F · 0.0°F off
- McLaughlin, SD 43°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (40.2" here), excluding temperature-peer places.
- Anamosa, IA 40.1" · 0.0" off
- Upper Sandusky, OH 40.2" · 0.0" off
- Angelica, NY 40.2" · 0.0" off
- Lancaster, OH 40.2" · 0.0" off
Data-derived climate profile
How Grafton's climate pattern fits together
heating led · moderate · mid swing
Grafton's energy balance leans toward cold weather: 8,180 annual heating degree days against 261 for cooling. Its 48.6°F seasonal range still makes the monthly rows more useful than the annual average alone.
Only about 128 days are frost-free in a normal year. That short interval is consistent with the cold-season signal, but the measure does not predict the exact first or last freeze in any one year.
July and January mark the typical warm and cold ends of the calendar in Grafton's middle-range seasonal profile. The measured spread is 48.6°F. The annual average is 43°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Grafton's 40.2 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Snowfall is not added to the interpretation because its annual value is missing. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
These labels group NOAA 1991-2020 normals from Grafton's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for Grafton, not an official NOAA class or a year-ahead forecast.
Questions about Grafton's climate
How much rain does Grafton get? ▼
How cold does Grafton get in winter? ▼
How much energy does heating and cooling require in Grafton? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Grafton's primary station: GRAFTON (USC00273530). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Grafton; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Grafton comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.