Climate Comfort Score
54/100
Moderate
NOAA 1991–2020 normals 43°F annual avg Public-domain federal data
Grafton, NH Climate
Annual temperature, rainfall, and a comfort score, sourced from NOAA NCEI's 1991–2020 normals →
- 43°F
- Avg annual temp
- 54/100
- Comfort score
- 40.2"
- Annual precip
- 128d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Grafton
Grafton, New Hampshire averages 43°F a year and scores 54/100 on the comfort index - moderate, milder than 27% of U.S. cities.
- 43°F
- average temperature, NOAA 1991-2020 normal
- 54/100
- comfort score, milder than 27% of U.S. cities
- 40.2"
- annual precipitation
- 128 days
- growing season, frost-free days
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
43°F (6°C)
Avg High
55°F
Avg Low
31°F
Annual Precip
40.2"
Comfort Score
54/100
Moderate
Avg Annual Temperature
43°F
30-year mean (NOAA NCEI)
Annual Precipitation
40.2"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Grafton) 54.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Moderate for the Grafton area.
How Grafton compares to every U.S. city
Grafton's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
54 Top 73% higher than 27% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for Grafton
MethodologyGrafton's NOAA 1991-2020 normal sits inside a longer story: U.S. land temperatures have been tracking (and drifting from) the global mean since 1900, and the chart below shows that spread, with the most recent decade running warmer than the 30-year mean.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
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 |
Monthly Precipitation
Average monthly rainfall
January 2.9"
12.4 days with precipitation
February 2.5"
9.3 days with precipitation
March 3.0"
11.2 days with precipitation
April 3.2"
10.2 days with precipitation
May 3.2"
9.9 days with precipitation
June 4.2"
10.4 days with precipitation
July 3.9"
9.9 days with precipitation
August 3.3"
7.7 days with precipitation
September 3.2"
9.9 days with precipitation
October 4.5"
9.4 days with precipitation
November 3.1"
11.3 days with precipitation
December 3.0"
11.4 days with precipitation
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
What Grafton's climate means for you
Grafton runs 43°F a year - peaking in July, coldest in January.
- Gardeners get about 128 frost-free days, with the last spring freeze near May 21 - plan the planting calendar around it, not the regional average.
- Energy bills track 8,180 heating and 261 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: Grafton, NH
In Grafton, New Hampshire, the NOAA 1991–2020 climate normals put the annual average temperature at 43°F, ranging from a mean daily high of 55°F to a mean daily low of 31°F. July is typically the warmest month of the year, while January is the coldest. As thirty-year averages computed from station USC00273530, these numbers smooth out year-to-year noise into a working baseline for a typical month.
Grafton averages 40.2 inches of precipitation a year, predominantly as rainfall, and that matters as much to daily life here as temperature does. The frost-free season averages 128 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near May 21 and the first fall freeze near September 26. As for energy demand, 8,180 heating degree days and 261 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Grafton scores 54/100 (Moderate), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. Shoulder seasons bring the mildest highs and lows in the monthly tables above, summer brings July-driven heat, and winter brings January-driven cold - use that rhythm for planning. These figures are thirty-year averages rather than forecasts, so a specific year may still run warmer, cooler, wetter, or drier than what's shown.
Frequently Asked Questions
What is the average temperature in Grafton, NH? ▼
The average annual temperature in Grafton, New Hampshire is 43°F. The warmest month averages 80°F (26°C) and the coldest averages 7°F (-14°C).
How much rain does Grafton get? ▼
Grafton receives 40.2 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Grafton? ▼
Grafton has a climate comfort score of 54/100 (Moderate), milder than 27% of U.S. cities in the PlainClimate database.
When is the growing season in Grafton? ▼
Grafton has approximately 128 frost-free days per year, with the last spring freeze around May 21 and the first fall freeze around September 26.
How much energy does heating and cooling require in Grafton? ▼
Grafton has 8,180 heating degree days and 261 cooling degree days annually, a heating-dominated climate. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this Grafton climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00273530 near Grafton.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00273530. For informational purposes only.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.