Hopkinton Lake, New Hampshire climate: Climate normals at a NOAA weather station
Hopkinton Lake's normal year runs from 13°F January nights to 83°F July afternoons, with 48.0 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.9°C, January lows of −11°C, July highs of 28°C, 1,220 mm of precipitation a year.
- NOAA stationHopkinton Lake
- Station IDUSC00274218
- Location43.19°N 71.75°W
- Elevation430 ft (131 m)
On October 23, the normal high in Hopkinton Lake is 57°F and the normal low 35°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Hopkinton Lake.
- Jan 32° 13°
- Feb 36° 11°
- Mar 43° 20°
- Apr 57° 32°
- May 69° 43°
- Jun 77° 52°
- Jul 83° 58°
- Aug 81° 56°
- Sep 74° 47°
- Oct 60° 37°
- Nov 47° 28°
- Dec 37° 19°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Hopkinton Lake 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 (5.43 in), the least in February (3.07 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 32°F | 13°F | 22.3°F | 3.32 | – | <1 | 31 | 9 h 20 min |
| February | 36°F | 11°F | 23.4°F | 3.07 | – | <1 | 27 | 10 h 30 min |
| March | 43°F | 20°F | 31.8°F | 3.75 | – | <1 | 27 | 11 h 50 min |
| April | 57°F | 32°F | 44.3°F | 3.85 | – | <1 | 19 | 13 h 20 min |
| May | 69°F | 43°F | 55.8°F | 3.67 | – | <1 | 2 | 14 h 40 min |
| June | 77°F | 52°F | 64.7°F | 4.48 | – | 3 | <1 | 15 h 20 min |
| July | 83°F | 58°F | 70.3°F | 4.28 | – | 6 | <1 | 15 h 10 min |
| August | 81°F | 56°F | 68.3°F | 4.01 | – | 2 | <1 | 14 h |
| September | 74°F | 47°F | 60.6°F | 4.00 | – | <1 | 3 | 12 h 30 min |
| October | 60°F | 37°F | 48.4°F | 5.43 | – | <1 | 9 | 11 h 10 min |
| November | 47°F | 28°F | 37.8°F | 3.86 | – | <1 | 25 | 9 h 50 min |
| December | 37°F | 19°F | 28.0°F | 4.31 | – | <1 | 29 | 9 h |
| Year (annual) | 58°F | 35°F | 46.3°F | 48.03 | – | 11 | 171 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 0°C | −11°C | −5.4°C | 84 mm |
| February | 2°C | −12°C | −4.8°C | 78 mm |
| March | 6°C | −7°C | −0.1°C | 95 mm |
| April | 14°C | 0°C | 6.8°C | 98 mm |
| May | 20°C | 6°C | 13.2°C | 93 mm |
| June | 25°C | 11°C | 18.2°C | 114 mm |
| July | 28°C | 14°C | 21.3°C | 109 mm |
| August | 27°C | 13°C | 20.2°C | 102 mm |
| September | 23°C | 8°C | 15.9°C | 102 mm |
| October | 16°C | 3°C | 9.1°C | 138 mm |
| November | 9°C | −2°C | 3.2°C | 98 mm |
| December | 3°C | −7°C | −2.2°C | 109 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Concord (12 miles away), gets 68 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00274218; 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.
Which months are mildest at Hopkinton Lake?
Normal highs sit between 65°F and 85°F in May, June, July, August and September.
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 USC00274218.
When is the last frost at Hopkinton Lake?
In Hopkinton Lake, the last spring frost (32°F) comes after May 6 in half of years and after May 20 in one year in ten; the first autumn frost comes before October 1 in half of years and before September 20 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 61 year in 10 after May 20; 9 in 10 after April 27
- First autumn frost, half of years before
- October 11 year in 10 before September 20; 9 in 10 before October 13
NOAA puts the median frost-free season at 146 days, and the season without a hard freeze (28°F) at 166 days.
A hard freeze (28°F) comes after April 27 in half of springs and before October 11 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Hopkinton Lake in zone 5b in ZIP code 03229, the nearest ZIP area.
Frost dates for every NOAA station in New Hampshire · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00274218; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 at Hopkinton Lake?
In a normal year in Hopkinton Lake, 11 days a year reach 90°F and 171 nights fall to 32°F or colder.
- Days at 90°F or more
- 11a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 171a normal year
- Days that stay below freezing
- 38high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00274218.
How sunny is it at Hopkinton Lake?
Over a year 70% of the sunlight that would reach the ground under clear skies gets through the clouds at Hopkinton Lake, 3.7 kWh per square metre a day. August is the sunniest month (77%) and December the cloudiest (62%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 66% | 1.7 |
| February | 68% | 2.5 |
| March | 68% | 3.6 |
| April | 68% | 4.6 |
| May | 67% | 5.2 |
| June | 70% | 5.6 |
| July | 76% | 5.8 |
| August | 77% | 5.2 |
| September | 77% | 4.2 |
| October | 66% | 2.7 |
| November | 66% | 1.8 |
| December | 62% | 1.3 |
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 many heating and cooling degree days does Hopkinton Lake record?
A normal year at Hopkinton Lake brings 7,215 heating degree days, 34% more than the median U.S. place (5,373), and 429 cooling degree days, 53% 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 2,294 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,325 | 0 |
| February | 1,166 | 0 |
| March | 1,031 | 0 |
| April | 623 | 0 |
| May | 298 | 11 |
| June | 84 | 73 |
| July | 11 | 174 |
| August | 24 | 126 |
| September | 175 | 43 |
| October | 516 | 2 |
| November | 816 | 0 |
| December | 1,147 | 0 |
| Year (annual) | 7,215 | 429 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00274218. 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.
Have recent years at Hopkinton Lake been warmer than normal?
2024 averaged 49.1°F, 2.8°F above the 1991-2020 normal of 46.3°F. 4 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 48.4°F | +2.1°F | 49.47 |
| 2022 | 47.3°F | +1.0°F | 48.30 |
| 2023 | 49.5°F | +3.2°F | 53.52 |
| 2024 | 49.1°F | +2.8°F | 47.10 |
Source: observed years: ACIS, station USC00274218. A year counts only with all twelve months complete.
How does Hopkinton Lake's climate compare?
Hopkinton Lake is warmer than 16 of the 28 places with their own NOAA record in New Hampshire, and wetter than 24. Across the 7,247 U.S. stations with normals, its annual mean of 46.3°F is warmer than 25%.
In the Köppen classification computed from these normals, Hopkinton Lake is Dfb: continental, no dry season, warm 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 Hopkinton Lake share this climate record?
2 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.
- Henniker, NH6,267 people · 4 mi W
- Contoocook, NH1,370 people · 3 mi NE
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 Hopkinton Lake's climate
What is the coldest month at Hopkinton Lake?
January, with a normal high of 32°F and a normal low of 13°F. The warmest is July (83°F by day, 58°F at night).
Does it snow at Hopkinton Lake?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Concord (12 miles away), records 68 inches of snow in a normal year.
What is the rainiest month at Hopkinton Lake?
October, with 5.43 in of precipitation in a normal year; the driest is February with 3.07 in.
What plant hardiness zone is Hopkinton Lake in?
The USDA's 2023 map puts Hopkinton Lake in zone 5b in ZIP code 03229, the nearest ZIP area.
How late can frost come at Hopkinton Lake?
In half of years the last 32°F night comes after May 6; in one year in ten it comes after May 20. Waiting until May 20 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
- Weare (2 mi NE), NH6 miles from this station, 46.8°F a year
- Weare, NH7 miles from this station, 46.3°F a year
- Salisbury, NH11 miles from this station, 45.5°F a year
- Concord, NH12 miles from this station, 47.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made