Hornell, New York Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Hornell weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 3Clear——79°46°—
- ThursdayJun 4Overcast——83°56°+4°
- FridayJun 5Overcast——86°60°+3°
- SaturdayJun 6Light Showers68%0.10″74°61°-12°
- SundayJun 7Light Drizzle32%—71°58°-3°
- MondayJun 8Partly Cloudy——71°51°0°
- TuesdayJun 9Clear——77°52°+6°
Ozone at AQI 34. AQI up 8 over the last 6 hours (gradual rise). Overcast through the UV peak window (cloud cover ~99%) — afternoon ozone should stay flat.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 34. Overcast through the UV peak window (cloud cover ~99%) — afternoon ozone should stay flat.
- Present
- AQI 34
- UV peak
- 0.0 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 4
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 3:47 AM
- Moonset
- 1:03 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Hornell at a glance
- Today vs. normal: 9°F below the seasonal normal for this latitude
- Last frost: April 30 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | — | — |
| May | lettuce, peas, spinach, radishes | lettuce, peas, radishes |
| June | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | tomatoes, peppers, beans, squash, fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | — | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
Hornell's warmest month is July (~68°F mean) and its coldest is January (~21°F). Rainfall peaks in June (4.1 inches) and bottoms out in February (1.9 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 21° | 2.4″ | 7 |
| February | 23° | 1.9″ | 6 |
| March | 31° | 2.6″ | 7 |
| April | 43° | 3.3″ | 8 |
| May | 55° | 3.4″ | 8 |
| June | 63° | 4.1″ | 9 |
| July | 68° | 4.0″ | 8 |
| August | 66° | 3.9″ | 7 |
| September | 59° | 3.9″ | 7 |
| October | 48° | 3.6″ | 8 |
| November | 37° | 2.7″ | 7 |
| December | 28° | 2.7″ | 7 |
Regional context
Hornell's climate, per the NOAA NCEI 1991-2020 normals from the nearest reporting station, runs cold-winter and warm-summer. January means hover near 21°F while July climbs to 68°F — a 47°F seasonal swing typical of northern-tier latitudes. Annual precipitation totals about 38.4 inches spread across roughly 89 days with measurable rain or snow.
Precipitation runs summer-dominant here: June averages 4.1 inches across 8.6 days with measurable rain, driven mostly by warm-season storms and thunderstorm activity, while February drops to just 1.9 inches across 5.8 rainy days under drier cool-season air. That wet-warm-summer pattern groups Hornell with places like North Hornell, NY, Arkport, NY and Canaseraga, NY — a regional cohort where summer thunderstorm season carries more than half the annual moisture.
The frost-sensitive growing window opens around late-May, when overnight lows reliably clear freezing for cool-season crops like kale, peas, spinach, and parsnips. Warm-season transplants — tomatoes, peppers, and basil — typically wait two weeks past that date to avoid late spring cold snaps. The window closes around early-October, when overnight lows resume dipping below freezing and frost-tender plants need protection or harvest. These are 30-year central tendencies; year-to-year frost dates can move by up to two weeks. Local features matter: a south-facing slope inside Hornell typically runs 3-5 days ahead of the regional last-frost date, while a low-lying lot along a creek or drainage can lag the same date by a week or more on calm clear nights.
Similar climates: North Hornell, NY, Arkport, NY, Canaseraga, NY, Dansville, NY, Cumminsville, NY.
Frequently asked
- When does it freeze in Hornell?
- Hornell's last spring frost typically falls around mid-May, and the first fall frost arrives around mid-October.
- What is the rainy season in Hornell?
- June is the wettest month with about 4.1 inches of rain on average; the city receives roughly 38 inches annually.
- What is the warmest month in Hornell?
- July is typically warmest, averaging about 68°F.
- What is the coldest month in Hornell?
- January is typically coldest, averaging about 21°F.
- When can I start a vegetable garden in Hornell?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-May); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Hornell get?
- Hornell averages about 89 rainy days per year.
- What hardiness zone is Hornell?
- Hornell's USDA hardiness zone is determined by its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Hornell, New York sits in a warm-summer humid continental climate zone. January means hover near 21°F while July averages 68°F — a 47°F seasonal swing.
Across the year, Hornell receives about 38 inches of precipitation spread over roughly 89 rainy days.
The rhythm of the year is set by latitude (42.3°N), proximity to large water bodies, and elevation — all of which shape what grows here, when frost is likely, and what the weather story looks like day to day.