Jefferson, NH Climate: Temperature & Rain by Month
Average temperature and precipitation from NOAA NCEI 1991–2020 normals →, with a derived climate comfort score
30-year climate normals (1991-2020) from Jefferson's primary NOAA station, JEFFERSON.
The climate verdict for Jefferson
Jefferson, New Hampshire has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 43°F. At 44/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 10% of scores.
- 43°F
- annual average temperature (NOAA normal)
- 44/100
- comfort score, above 10% of station-mapped location scores
- 41.0"
- annual precipitation · 95" snow
- 146 days
- frost-free days per growing season
Jefferson: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00274329 · Jefferson, NH 43°F mean · 41.0" 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 #686
- PHOTO-FINISH ≈ Small
- PRCP-MID 41.0"
- SWING-WIDE 50°F
- COMF-LOW 44/100
- LOAD-HEAT 8,391 HDD
- STN-1 USC00274329
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Small, ID (+ 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.
- Jefferson (this station) 43°F
- Hot Rudyard, MI 43°F
- Near Small, ID 43°F
- Near Whitefield Mt W…, NH 43°F
- Near Grand Marais, MI 43°F
Climate Living Index · Jefferson
Jefferson: 29/100 · grade F
Jefferson publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Jefferson, not an official NOAA rating. Rankings still use Comfort Score 44/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 41.0 in · 6.0 from 35 in | 79/100 · B |
| Normal heat + freeze calendar | 171 calendar days | 31/100 · F |
| Frost-free season | 146 days/year | 22/100 · F |
| Annual temperature balance | 42.5°F · 25.0° from 67.5°F | 11/100 · F |
| Snowfall burden | 94.8 inches/year | 1/100 · F |
Jefferson · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Jefferson is a continental Köppen climate: Dfb
Coldest-month mean 16.8°F and warmest-month mean 66.7°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
- 66.7°F
- Coldest month
- 16.8°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 Jefferson sits across the climate record
Three NOAA fields for Jefferson's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 90%
- Among 6,861 stations, Jefferson sits in the cooler third of annual means.
- Annual precipitation
- 60th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Wider than 81%
- Warmest-to-coldest month gap for Jefferson is large versus 6,861 complete station-years.
How Jefferson compares across U.S. station-mapped locations
Jefferson's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
44 10th percentile score exceeds 10% 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%). This entry sits in this band.
- 50–60: 1,329 station-mapped locations (21%). Above this entry.
- 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 | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 26°F (-3°C) | 7°F (-14°C) | 17°F (-8°C) | 2.5" | 20.1" | 30.5 | 0.0 |
| February | 29°F (-2°C) | 9°F (-13°C) | 19°F (-7°C) | 2.3" | 19.8" | 27.5 | 0.0 |
| March | 38°F (3°C) | 18°F (-8°C) | 28°F (-2°C) | 2.6" | 16.7" | 28.5 | 0.0 |
| April | 51°F (11°C) | 30°F (-1°C) | 41°F (5°C) | 3.4" | 6.5" | 19.4 | 0.0 |
| May | 64°F (18°C) | 42°F (5°C) | 53°F (12°C) | 3.8" | 0.5" | 2.6 | 0.1 |
| June | 73°F (23°C) | 51°F (10°C) | 62°F (16°C) | 4.4" | 0.0" | 0.1 | 0.6 |
| July | 78°F (25°C) | 56°F (13°C) | 67°F (19°C) | 4.3" | 0.0" | 0.0 | 0.8 |
| August | 76°F (24°C) | 54°F (12°C) | 65°F (18°C) | 4.0" | 0.0" | 0.0 | 0.1 |
| September | 67°F (20°C) | 45°F (7°C) | 56°F (14°C) | 3.3" | 0.0" | 2.0 | 0.0 |
| October | 55°F (13°C) | 37°F (3°C) | 46°F (8°C) | 4.3" | 1.8" | 8.8 | 0.0 |
| November | 42°F (5°C) | 27°F (-3°C) | 34°F (1°C) | 3.0" | 7.7" | 24.4 | 0.0 |
| December | 31°F (-1°C) | 16°F (-9°C) | 23°F (-5°C) | 3.3" | 21.7" | 28.7 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 78°F around July 21, short of 90°F on every date, while 171 dates carry a normal low at or below freezing, the coldest 6°F near January 24.
The freezing stretch
The normal low stays at or below 32°F into April 19, then returns to freezing around November 1, covering 171 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 December 29, when 56% of years recorded at least a hundredth of an inch. The driest is September 7 at 36%. Summed across the calendar, that is about 168 wet dates a year.
The widest day
May 18 carries the biggest normal gap between afternoon and dawn, 23°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Jefferson.
Where Jefferson Stands Nationally
Days and nights track unusually close together; the widest normal swing, about 23°F, is narrower than most stations record.
Jefferson 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 and snowfall
Snow: 20.1"
16.3 days with precipitation
Snow: 19.8"
13.5 days with precipitation
Snow: 16.7"
14.1 days with precipitation
Snow: 6.5"
13.6 days with precipitation
Snow: 0.5"
14.5 days with precipitation
14.5 days with precipitation
12.9 days with precipitation
12.2 days with precipitation
10.6 days with precipitation
Snow: 1.8"
14.4 days with precipitation
Snow: 7.7"
14.5 days with precipitation
Snow: 21.7"
16.9 days with precipitation
Jefferson spreads its precipitation across the year
Neither half of the year dominates here: June through August take 31% of the annual total and December through February 20%, with neither reaching the 35% that would mark a distinct wet season. Jefferson has no dry season to plan around, though it does carry a wide 49.9°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: June averages 4.4" and February 2.3". The three wettest months together take 32% 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 Jefferson's precipitation splits across the calendar
About 168 days a year record measurable precipitation here, carrying 41.0" between them, or roughly 0.24 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.
Winter brings real snow to Jefferson
Jefferson averages 94.8 inches of snowfall a year, with December the snowiest month on the normals, spread across roughly 67 days that record measurable snow. That is depth accumulating on the ground, which is why it can exceed the annual precipitation figure: precipitation counts the liquid the snow melts down to, and fresh snow is mostly air.
- Annual snowfall: 94.8 inches of depth.
- Days recording measurable snow: about 67 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 23% of the year's precipitation.
NOAA 1991-2020 normals. The ten-to-one ratio is a convention, not a measurement: real ratios vary with temperature, so treat the share as an order of magnitude rather than an exact split.
Frost Dates & Growing Season
First Fall Freeze
October 1
50% probability date
Last Spring Freeze
May 8
50% probability date
Growing Season
146 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
8,391
Higher = more heating needed
Cooling Degree Days
219
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside NH closest to Jefferson 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).
- Alder, MT 43°F · 0.0°F off
- Alexandria, MN 43°F · 0.0°F off
- Copper Harbor, MI 43°F · 0.0°F off
- Edgeley, ND 43°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (41.0" here), excluding temperature-peer places.
- Havana, IL 41.0" · 0.0" off
- Byars, OK 41.0" · 0.0" off
- Cleveland, OH 41.0" · 0.0" off
- White Sulphur Springs, WV 41.0" · 0.0" off
Snow and freeze rhythm
When cold and snow define Jefferson
heating led · moderate · mid swing
Jefferson's energy balance leans toward cold weather: 8,391 annual heating degree days against 219 for cooling. Its 49.9°F seasonal range still makes the monthly rows more useful than the annual average alone.
Only about 146 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.
-
1. Jefferson coldest normal
January
Averaging 17°F (-8°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. Jefferson typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Jefferson snow peak
December
Jefferson averages 94.8 inches of snow a year, with December the snowiest month on the normals.
Questions about Jefferson's climate
How much snow does Jefferson get? ▼
How cold does Jefferson get in winter? ▼
How much energy does heating and cooling require in Jefferson? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Jefferson's primary station: JEFFERSON (USC00274329). 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 Jefferson; 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 Jefferson 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.