Peconic, New York Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Peconic weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——79°52°—
- FridayJun 5Overcast——84°55°+5°
- SaturdayJun 6Overcast33%—79°63°-5°
- SundayJun 7Drizzle50%—80°61°+1°
- MondayJun 8Overcast23%—71°57°-9°
- TuesdayJun 9Mostly Clear——77°57°+6°
- WednesdayJun 10Partly Cloudy10%—79°60°+2°
PM2.5 at 8.2 µg/m³ (AQI 46) with a 0.75 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust. AQI down 21 over the last 6 hours — air quality is improving sharply.
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 43 now. With UV 3.3 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 19 by mid-afternoon.
- Present
- AQI 43
- UV peak
- 3.3 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 19
PM × Wind × Precip
PM2.5 at 8.2 µg/m³ (AQI 46) with a 0.75 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.75
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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
- 3:21 AM
- Moonset
- 12:45 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Peconic at a glance
- Today vs. normal: 21°F below the seasonal normal for this latitude
- Last frost: April 22 (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.
SPC Convective Outlook
Storm Prediction Center — Peconic
SPC has placed Peconic in the General Thunderstorms category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
Peconic's warmest month is July (~73°F mean) and its coldest is January (~30°F). Rainfall peaks in December (4.3 inches) and bottoms out in July (3.1 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 30° | 3.6″ | 12 |
| February | 32° | 3.1″ | 10 |
| March | 38° | 4.3″ | 14 |
| April | 48° | 4.1″ | 14 |
| May | 58° | 3.5″ | 12 |
| June | 67° | 3.8″ | 13 |
| July | 73° | 3.1″ | 10 |
| August | 73° | 4.1″ | 14 |
| September | 66° | 3.8″ | 13 |
| October | 55° | 4.0″ | 13 |
| November | 45° | 3.5″ | 12 |
| December | 36° | 4.3″ | 14 |
Regional context
Peconic's baseline climate, derived from NOAA NCEI 1991-2020 normals at the nearest reporting station, swings from a January mean of 30°F to a July mean of 73°F — a 43°F seasonal arc typical of the mid-latitude bands. Annual precipitation runs about 45 inches spread across roughly 151 days with measurable rain or snow each year.
Rainfall stays relatively even across the calendar: December tops out at 4.3 inches across 14.0 days with measurable rain, and July settles around 3.1 inches across 10.0 rainy days — a comparatively narrow seasonal range. That even-rainfall rhythm puts Peconic alongside places like Cutchogue, NY, New Suffolk, NY and Mattituck, NY — places without a single dominant storm season, where moisture arrives steadily across the calendar.
The frost-sensitive growing window opens around mid-April, when overnight lows reliably clear freezing for cool-season crops like peas, lettuce, spinach, and radishes. Heat-loving transplants like tomatoes, peppers, and squash generally hold off for another 10-14 days to clear the last spring frost risk window. The window closes around mid-November, when overnight lows resume dipping below freezing and frost-tender plants need protection or harvest. Those dates are 30-year averages; the actual frost-free window in a given year can vary by 10-14 days at either end. Neighborhood-scale variation in elevation and cold-air pooling means the practical last-frost date inside Peconic can lag the regional mean by 5-10 days in low spots, and a bench position with good cold-air drainage can run a week ahead.
Similar climates: Cutchogue, NY, New Suffolk, NY, Mattituck, NY, Shelter Island Heights, NY, Greenport West, NY.
Frequently asked
- When does it freeze in Peconic?
- Peconic's last spring frost typically falls around mid-April, and the first fall frost arrives around mid-November.
- What is the rainy season in Peconic?
- December is the wettest month with about 4.3 inches of rain on average; the city receives roughly 45 inches annually.
- What is the warmest month in Peconic?
- July is typically warmest, averaging about 73°F.
- What is the coldest month in Peconic?
- January is typically coldest, averaging about 30°F.
- When can I start a vegetable garden in Peconic?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-April); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Peconic get?
- Peconic averages about 151 rainy days per year.
- What hardiness zone is Peconic?
- Peconic'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
Peconic, New York sits in a warm-summer humid continental climate zone. January means hover near 30°F while July averages 73°F — a 43°F seasonal swing.
Across the year, Peconic receives about 45 inches of precipitation spread over roughly 151 rainy days.
The rhythm of the year is set by latitude (41.0°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.