Hemlock, New York climate: Normal weather by month, frost dates and records
Hemlock's normal year runs from 17°F January nights to 81°F July afternoons, with 37.3 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.0°C, January lows of −9°C, July highs of 27°C, 948 mm of precipitation a year.
- NOAA stationHemlock
- Station IDUSC00303773
- Location42.77°N 77.61°W
- Elevation902 ft (275 m)
- Population (census place)736
On October 23, the normal high in Hemlock is 58°F and the normal low 40°F, and the chance of measurable rain or snow is 53%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Hemlock.
- Jan 33° 17°
- Feb 35° 17°
- Mar 43° 24°
- Apr 57° 35°
- May 69° 46°
- Jun 77° 56°
- Jul 81° 60°
- Aug 79° 59°
- Sep 73° 53°
- Oct 60° 42°
- Nov 49° 32°
- Dec 38° 24°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Hemlock each month?
July is the warmest month, with normal highs of 81°F; January the coldest, with normal lows of 17°F. The most precipitation falls in July (4.19 in), the least in February (1.82 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 33°F | 17°F | 24.6°F | 2.15 | 18 | <1 | 28 | 9 h 20 min |
| February | 35°F | 17°F | 25.8°F | 1.82 | 14 | <1 | 26 | 10 h 30 min |
| March | 43°F | 24°F | 33.5°F | 2.63 | 15 | <1 | 24 | 11 h 50 min |
| April | 57°F | 35°F | 45.8°F | 3.03 | 14 | <1 | 13 | 13 h 20 min |
| May | 69°F | 46°F | 57.6°F | 3.30 | 14 | <1 | 1 | 14 h 40 min |
| June | 77°F | 56°F | 66.2°F | 3.88 | 14 | 1 | <1 | 15 h 20 min |
| July | 81°F | 60°F | 70.5°F | 4.19 | 13 | 2 | <1 | 15 h |
| August | 79°F | 59°F | 68.9°F | 3.77 | 13 | 1 | <1 | 14 h |
| September | 73°F | 53°F | 62.6°F | 3.43 | 13 | <1 | <1 | 12 h 30 min |
| October | 60°F | 42°F | 51.3°F | 3.72 | 16 | <1 | 3 | 11 h 10 min |
| November | 49°F | 32°F | 40.4°F | 2.84 | 14 | <1 | 16 | 9 h 50 min |
| December | 38°F | 24°F | 30.8°F | 2.55 | 16 | <1 | 26 | 9 h |
| Year (annual) | 58°F | 39°F | 48.2°F | 37.31 | 174 | 4 | 138 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 0°C | −9°C | −4.1°C | 55 mm |
| February | 2°C | −8°C | −3.4°C | 46 mm |
| March | 6°C | −5°C | 0.8°C | 67 mm |
| April | 14°C | 2°C | 7.7°C | 77 mm |
| May | 21°C | 8°C | 14.2°C | 84 mm |
| June | 25°C | 13°C | 19.0°C | 99 mm |
| July | 27°C | 16°C | 21.4°C | 106 mm |
| August | 26°C | 15°C | 20.5°C | 96 mm |
| September | 23°C | 11°C | 17.0°C | 87 mm |
| October | 16°C | 6°C | 10.7°C | 94 mm |
| November | 9°C | 0°C | 4.7°C | 72 mm |
| December | 3°C | −5°C | −0.7°C | 65 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Honeoye (5 miles away), gets 55 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00303773; 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.
When is the best weather to visit Hemlock?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, August has the fewest days with rain (13).
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 USC00303773.
When is the last frost in Hemlock?
In Hemlock, the last spring frost (32°F) comes after May 2 in half of years and after May 16 in one year in ten; the first autumn frost comes before October 18 in half of years and before October 2 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 21 year in 10 after May 16; 9 in 10 after April 22
- First autumn frost, half of years before
- October 181 year in 10 before October 2; 9 in 10 before November 3
NOAA puts the median frost-free season at 167 days, and the season without a hard freeze (28°F) at 190 days.
A hard freeze (28°F) comes after April 22 in half of springs and before November 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Hemlock in zone 6a in ZIP code 14466. By the map's own method, the average of each year's coldest night over 1991-2020, Hemlock's NOAA station is in zone 6a: the coldest night of a typical year reaches −8°F (25 complete years).
Frost dates for every NOAA station in New York · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00303773; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. 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 in Hemlock?
In a normal year in Hemlock, 4 days a year reach 90°F, 138 nights fall to 32°F or colder and 174 days bring measurable precipitation.
- Days at 90°F or more
- 4a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 138a normal year
- Days that stay below freezing
- 47high of 32°F or less
- Days with 0.01 inch of precipitation
- 174a normal year
The highest temperature in this station's record (since 1898) is 100°F, on July 2, 1931; the lowest is −28°F, on January 15, 1957.
The wettest calendar year on that record is 2017, with 46.41 in; the snowiest season is 1959–60, with 93.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00303773; records: ACIS (NOAA Regional Climate Centers), station USC00303773. Records use complete months only; a month missing more than three days is left out.
How sunny is Hemlock?
Over a year 68% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Hemlock, 3.6 kWh per square metre a day. August is the sunniest month (76%) and December the cloudiest (50%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 52% | 1.4 |
| February | 58% | 2.2 |
| March | 62% | 3.4 |
| April | 65% | 4.5 |
| May | 69% | 5.4 |
| June | 72% | 5.9 |
| July | 76% | 5.9 |
| August | 76% | 5.2 |
| September | 74% | 4.2 |
| October | 62% | 2.6 |
| November | 59% | 1.7 |
| December | 50% | 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 much heating and cooling does Hemlock need?
A normal year in Hemlock brings 6,617 heating degree days, 23% more than the median U.S. place (5,373), and 514 cooling degree days, 43% 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 2,574 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,252 | 0 |
| February | 1,096 | 0 |
| March | 976 | 0 |
| April | 580 | 2 |
| May | 261 | 30 |
| June | 63 | 99 |
| July | 12 | 181 |
| August | 20 | 143 |
| September | 128 | 55 |
| October | 430 | 5 |
| November | 738 | 0 |
| December | 1,060 | 0 |
| Year (annual) | 6,617 | 514 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00303773. 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.
Has Hemlock been warmer than normal lately?
2025 averaged 48.7°F, 0.5°F above the 1991-2020 normal of 48.2°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 50.2°F | +2.0°F | 43.91 |
| 2022 | 48.7°F | +0.5°F | 34.59 |
| 2023 | 50.3°F | +2.1°F | 35.78 |
| 2024 | 51.2°F | +3.0°F | 40.35 |
| 2025 | 48.7°F | +0.5°F | 34.11 |
Over 103 complete years from 1901 to 2025, the station's annual mean temperature rose at a fitted 2.5°F per century (+0.14°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00303773; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Hemlock's climate compare?
Hemlock is warmer than 78 of the other 130 places with their own NOAA record in New York, and wetter than 23. Across the 7,247 U.S. stations with normals, its annual mean of 48.2°F is warmer than 33%.
In the Köppen classification computed from these normals, Hemlock 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 Hemlock share this climate record?
5 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.
- Conesus Lake, NY2,343 people · 5 mi W
- Livonia, NY1,467 people · 4 mi NW
- Livonia Center, NY326 people · 4 mi NW
- Websters Crossing, NY103 people · 8 mi S
- Conesus, NY94 people · 5 mi SW
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 Hemlock's climate
What is the coldest month in Hemlock?
January, with a normal high of 33°F and a normal low of 17°F. The warmest is July (81°F by day, 60°F at night).
Does it snow in Hemlock?
Yes. NOAA publishes no 1991-2020 snowfall normal for Hemlock's NOAA station; the nearest record that keeps one, Honeoye (5 miles away), records 55 inches of snow in a normal year.
What is the rainiest month in Hemlock?
July, with 4.19 in of precipitation in a normal year; the driest is February with 1.82 in.
What plant hardiness zone is Hemlock in?
The USDA's 2023 map puts Hemlock in zone 6a in ZIP code 14466. By the same method at Hemlock's NOAA station, the coldest night of a typical year reaches −8°F (25 years, 1991-2020): zone 6a.
How late can frost come in Hemlock?
In half of years the last 32°F night comes after May 2; in one year in ten it comes after May 16. Waiting until May 16 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
- Honeoye, NY5 miles from this station, 47.6°F a year
- Avon, NY12 miles from this station, 47.9°F a year
- Dansville, NY15 miles from this station, 49.5°F a year
- Mount Morris, NY16 miles from this station, 47.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made