Portland1 SW, New York climate: Climate normals at a NOAA weather station
Portland1 SW's normal year runs from 20°F January nights to 80°F July afternoons, with 45.7 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.1°C, January lows of −7°C, July highs of 27°C, 1,160 mm of precipitation a year.
- NOAA stationPortland1 SW
- Station IDUSC00306747
- Location42.37°N 79.49°W
- Elevation808 ft (246 m)
On October 23, the normal high in Portland1 SW is 59°F and the normal low 44°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Portland1 SW.
- Jan 34° 20°
- Feb 36° 19°
- Mar 44° 27°
- Apr 57° 37°
- May 68° 49°
- Jun 77° 59°
- Jul 80° 63°
- Aug 79° 63°
- Sep 74° 56°
- Oct 62° 46°
- Nov 50° 37°
- Dec 39° 28°
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 Portland1 SW each month?
July is the warmest month, with normal highs of 80°F; January the coldest, with normal lows of 20°F. The most precipitation falls in July (4.88 in), the least in February (2.41 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 34°F | 20°F | 27.3°F | 3.34 | – | <1 | 26 | 9 h 20 min |
| February | 36°F | 19°F | 27.6°F | 2.41 | – | <1 | 23 | 10 h 30 min |
| March | 44°F | 27°F | 35.4°F | 2.89 | – | <1 | 20 | 11 h 50 min |
| April | 57°F | 37°F | 47.1°F | 3.69 | – | <1 | 10 | 13 h 20 min |
| May | 68°F | 49°F | 58.4°F | 3.69 | – | <1 | 1 | 14 h 30 min |
| June | 77°F | 59°F | 68.1°F | 4.10 | – | 1 | <1 | 15 h 20 min |
| July | 80°F | 63°F | 71.8°F | 4.88 | – | 1 | <1 | 15 h |
| August | 79°F | 63°F | 70.9°F | 3.87 | – | 1 | <1 | 14 h |
| September | 74°F | 56°F | 64.9°F | 4.09 | – | <1 | <1 | 12 h 30 min |
| October | 62°F | 46°F | 54.2°F | 4.65 | – | <1 | 1 | 11 h 10 min |
| November | 50°F | 37°F | 43.3°F | 4.05 | – | <1 | 9 | 9 h 50 min |
| December | 39°F | 28°F | 33.3°F | 4.00 | – | <1 | 20 | 9 h 10 min |
| Year (annual) | 58°F | 42°F | 50.2°F | 45.66 | – | 2 | 111 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 1°C | −7°C | −2.6°C | 85 mm |
| February | 2°C | −7°C | −2.4°C | 61 mm |
| March | 7°C | −3°C | 1.9°C | 73 mm |
| April | 14°C | 3°C | 8.4°C | 94 mm |
| May | 20°C | 9°C | 14.7°C | 94 mm |
| June | 25°C | 15°C | 20.1°C | 104 mm |
| July | 27°C | 17°C | 22.1°C | 124 mm |
| August | 26°C | 17°C | 21.6°C | 98 mm |
| September | 23°C | 13°C | 18.3°C | 104 mm |
| October | 17°C | 8°C | 12.3°C | 118 mm |
| November | 10°C | 3°C | 6.3°C | 103 mm |
| December | 4°C | −2°C | 0.7°C | 102 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Fredonia (10 miles away), gets 76 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00306747; 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 Portland1 SW?
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 USC00306747.
When is the last frost at Portland1 SW?
In Portland1 SW, the last spring frost (32°F) comes after April 25 in half of years and after May 12 in one year in ten; the first autumn frost comes before October 31 in half of years and before October 15 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
- April 251 year in 10 after May 12; 9 in 10 after April 12
- First autumn frost, half of years before
- October 311 year in 10 before October 15; 9 in 10 before November 15
NOAA puts the median frost-free season at 187 days, and the season without a hard freeze (28°F) at 213 days.
A hard freeze (28°F) comes after April 13 in half of springs and before November 12 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Portland1 SW in zone 6b in ZIP code 14769, 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 USC00306747; 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 Portland1 SW?
In a normal year in Portland1 SW, 2 days a year reach 90°F and 111 nights fall to 32°F or colder.
- Days at 90°F or more
- 2a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 111a normal year
- Days that stay below freezing
- 37high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00306747.
How sunny is it at Portland1 SW?
Over a year 69% of the sunlight that would reach the ground under clear skies gets through the clouds at Portland1 SW, 3.6 kWh per square metre a day. August is the sunniest month (79%) and December the cloudiest (47%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 52% | 1.4 |
| February | 56% | 2.2 |
| March | 60% | 3.3 |
| April | 65% | 4.5 |
| May | 71% | 5.5 |
| June | 75% | 6.0 |
| July | 79% | 6.0 |
| August | 79% | 5.4 |
| September | 76% | 4.2 |
| October | 63% | 2.6 |
| November | 58% | 1.6 |
| December | 47% | 1.1 |
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 Portland1 SW record?
A normal year at Portland1 SW brings 6,030 heating degree days, 12% more than the median U.S. place (5,373), and 667 cooling degree days, 26% 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 2,924 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,169 | 0 |
| February | 1,047 | 0 |
| March | 918 | 0 |
| April | 540 | 3 |
| May | 240 | 35 |
| June | 37 | 128 |
| July | 4 | 214 |
| August | 9 | 192 |
| September | 86 | 83 |
| October | 348 | 11 |
| November | 651 | 0 |
| December | 983 | 0 |
| Year (annual) | 6,030 | 667 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00306747. 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 Portland1 SW been warmer than normal?
2025 averaged 50.8°F, 0.6°F above the 1991-2020 normal of 50.2°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 52.6°F | +2.4°F | 44.46 |
| 2022 | 51.0°F | +0.8°F | – |
| 2023 | 52.0°F | +1.8°F | 40.89 |
| 2024 | 53.6°F | +3.4°F | 43.04 |
| 2025 | 50.8°F | +0.6°F | 37.97 |
Source: observed years: ACIS, station USC00306747. A year counts only with all twelve months complete.
How does Portland1 SW's climate compare?
Portland1 SW is warmer than 107 of the 131 places with their own NOAA record in New York, and wetter than 80. Across the 7,247 U.S. stations with normals, its annual mean of 50.2°F is warmer than 41%.
In the Köppen classification computed from these normals, Portland1 SW is Dfa: continental, no dry season, hot 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 Portland1 SW share this climate record?
Brocton has no NOAA station with 1991-2020 normals of its 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.
- Brocton, NY1,305 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 Portland1 SW's climate
What is the coldest month at Portland1 SW?
January, with a normal high of 34°F and a normal low of 20°F. The warmest is July (80°F by day, 63°F at night).
Does it snow at Portland1 SW?
Yes. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Fredonia (10 miles away), records 76 inches of snow in a normal year.
What is the rainiest month at Portland1 SW?
July, with 4.88 in of precipitation in a normal year; the driest is February with 2.41 in.
What plant hardiness zone is Portland1 SW in?
The USDA's 2023 map puts Portland1 SW in zone 6b in ZIP code 14769, the nearest ZIP area.
How late can frost come at Portland1 SW?
In half of years the last 32°F night comes after April 25; in one year in ten it comes after May 12. Waiting until May 12 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
- Westfield, NY7 miles from this station, 50.6°F a year
- Fredonia, NY11 miles from this station, 50.7°F a year
- Dunkirk, NY14 miles from this station, 48.8°F a year
- Jamestown, NY25 miles from this station, 47.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made