Stillwater Reservoir, New York climate: Climate normals at a NOAA weather station
Stillwater Reservoir's normal year runs from 4°F January nights to 75°F July afternoons, with 50.2 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 5.2°C, January lows of −16°C, July highs of 24°C, 1,276 mm of precipitation a year.
- NOAA stationStillwater Reservoir
- Station IDUSC00308248
- Location43.90°N 75.04°W
- Elevation1,690 ft (515 m)
On October 23, the normal high in Stillwater Reservoir is 52°F and the normal low 33°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Stillwater Reservoir.
- Jan 26° 4°
- Feb 28° 4°
- Mar 37° 13°
- Apr 50° 28°
- May 64° 42°
- Jun 71° 51°
- Jul 75° 55°
- Aug 74° 54°
- Sep 67° 47°
- Oct 55° 35°
- Nov 42° 25°
- Dec 32° 13°
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 Stillwater Reservoir each month?
July is the warmest month, with normal highs of 75°F; January the coldest, with normal lows of 4°F. The most precipitation falls in October (5.48 in), the least in February (2.83 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 26°F | 4°F | 14.9°F | 3.71 | – | <1 | 30 | 9 h 10 min |
| February | 28°F | 4°F | 16.3°F | 2.83 | – | <1 | 27 | 10 h 30 min |
| March | 37°F | 13°F | 24.9°F | 3.19 | – | <1 | 29 | 11 h 50 min |
| April | 50°F | 28°F | 38.7°F | 3.79 | – | <1 | 22 | 13 h 20 min |
| May | 64°F | 42°F | 52.7°F | 4.40 | – | <1 | 6 | 14 h 40 min |
| June | 71°F | 51°F | 61.0°F | 4.55 | – | <1 | <1 | 15 h 30 min |
| July | 75°F | 55°F | 65.0°F | 5.09 | – | <1 | <1 | 15 h 10 min |
| August | 74°F | 54°F | 64.0°F | 4.61 | – | <1 | <1 | 14 h |
| September | 67°F | 47°F | 56.9°F | 4.32 | – | <1 | 1 | 12 h 40 min |
| October | 55°F | 35°F | 45.1°F | 5.48 | – | <1 | 12 | 11 h 10 min |
| November | 42°F | 25°F | 33.5°F | 4.04 | – | <1 | 24 | 9 h 40 min |
| December | 32°F | 13°F | 22.2°F | 4.22 | – | <1 | 29 | 9 h |
| Year (annual) | 52°F | 31°F | 41.3°F | 50.23 | – | <1 | 181 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −3°C | −16°C | −9.5°C | 94 mm |
| February | −2°C | −15°C | −8.7°C | 72 mm |
| March | 3°C | −10°C | −3.9°C | 81 mm |
| April | 10°C | −2°C | 3.7°C | 96 mm |
| May | 18°C | 5°C | 11.5°C | 112 mm |
| June | 22°C | 10°C | 16.1°C | 116 mm |
| July | 24°C | 13°C | 18.3°C | 129 mm |
| August | 23°C | 12°C | 17.8°C | 117 mm |
| September | 19°C | 8°C | 13.8°C | 110 mm |
| October | 13°C | 2°C | 7.3°C | 139 mm |
| November | 6°C | −4°C | 0.8°C | 103 mm |
| December | 0°C | −11°C | −5.4°C | 107 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Big Moose (3 mi SE) (11 miles away), gets 154 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00308248; 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 Stillwater Reservoir?
Normal highs sit between 65°F and 85°F in 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 USC00308248.
When is the last frost at Stillwater Reservoir?
In Stillwater Reservoir, the last spring frost (32°F) comes after May 15 in half of years and after May 31 in one year in ten; the first autumn frost comes before October 2 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 151 year in 10 after May 31; 9 in 10 after April 30
- First autumn frost, half of years before
- October 21 year in 10 before September 20; 9 in 10 before October 16
NOAA puts the median frost-free season at 139 days, and the season without a hard freeze (28°F) at 160 days.
A hard freeze (28°F) comes after May 4 in half of springs and before October 12 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Stillwater Reservoir in zone 4a in ZIP code 13331, the nearest ZIP area.
Frost dates for every NOAA station in New York · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00308248; 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 Stillwater Reservoir?
In a normal year in Stillwater Reservoir, a 90°F day is rare and 181 nights fall to 32°F or colder.
- Days at 90°F or more
- fewer than 1a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 181a normal year
- Days that stay below freezing
- 78high of 32°F or less
The highest temperature in this station's record (since 1926) is 97°F, on July 2, 1931; the lowest is −52°F, on February 9, 1934.
The wettest calendar year on that record is 1954, with 60.96 in; the snowiest season is 1970–71, with 366.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00308248; records: ACIS (NOAA Regional Climate Centers), station USC00308248. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Stillwater Reservoir?
Over a year 68% of the sunlight that would reach the ground under clear skies gets through the clouds at Stillwater Reservoir, 3.6 kWh per square metre a day. August is the sunniest month (76%) and December the cloudiest (49%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 54% | 1.4 |
| February | 59% | 2.2 |
| March | 65% | 3.5 |
| April | 65% | 4.5 |
| May | 69% | 5.4 |
| June | 71% | 5.8 |
| July | 76% | 5.9 |
| August | 76% | 5.2 |
| September | 74% | 4.1 |
| October | 61% | 2.5 |
| November | 58% | 1.6 |
| December | 49% | 1.0 |
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 Stillwater Reservoir record?
A normal year at Stillwater Reservoir brings 8,789 heating degree days, 64% more than the median U.S. place (5,373), and 172 cooling degree days, 81% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 1,697 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,551 | 0 |
| February | 1,364 | 0 |
| March | 1,245 | 0 |
| April | 789 | 0 |
| May | 391 | 9 |
| June | 151 | 31 |
| July | 67 | 67 |
| August | 84 | 51 |
| September | 258 | 13 |
| October | 619 | 1 |
| November | 945 | 0 |
| December | 1,327 | 0 |
| Year (annual) | 8,789 | 172 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00308248. 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.
How does Stillwater Reservoir's climate compare?
Stillwater Reservoir is warmer than 2 of the 131 places with their own NOAA record in New York, and wetter than 106. Across the 7,247 U.S. stations with normals, its annual mean of 41.3°F is warmer than 8%.
In the Köppen classification computed from these normals, Stillwater Reservoir 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.
Questions about Stillwater Reservoir's climate
What is the coldest month at Stillwater Reservoir?
January, with a normal high of 26°F and a normal low of 4°F. The warmest is July (75°F by day, 55°F at night).
Does it snow at Stillwater Reservoir?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Big Moose (3 mi SE) (11 miles away), records 154 inches of snow in a normal year.
What is the rainiest month at Stillwater Reservoir?
October, with 5.48 in of precipitation in a normal year; the driest is February with 2.83 in.
What plant hardiness zone is Stillwater Reservoir in?
The USDA's 2023 map puts Stillwater Reservoir in zone 4a in ZIP code 13331, the nearest ZIP area.
How late can frost come at Stillwater Reservoir?
In half of years the last 32°F night comes after May 15; in one year in ten it comes after May 31. Waiting until May 31 leaves about a one-in-ten chance of a later frost.
Nearby and next
- New York climateThe statewide normals and every place in the state
- Big Moose (3 mi SE), NY11 miles from this station, 43.1°F a year
- Old Forge, NY14 miles from this station, 41.5°F a year
- Wanakena Ranger School, NY19 miles from this station, 43.1°F a year
- Lowville, NY24 miles from this station, 43.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made