CannaGLAP
Grow cannabis in Mount Vernon, NY
Growing cannabis in Mount Vernon: a cold season that sets the tent's schedule
A Mount Vernon grow spends a long stretch of the year up against the cold. The Bronx station, about 5 miles away, averages about 67 nights a year at 32°F or colder: about 15 in December, 20 in January and 20 in February, with about 10 more in March. January lows average 27°F.
Then summer turns the job around, with July and August air both averaging 75 percent humidity. If your tent sits in a Westchester County home all year, is it set up for January, for July, or for both?
Adults 21 and over: yes. Plant limit: 3 mature + 3 immature per adult; 6 mature + 6 immature per residence.
Secure location, not accessible to under 21s; not plainly visible from public view. Source: NY OCM home cultivation FAQ. Local rules (landlords, HOAs, city codes) can add more; this is a summary, not legal advice.
Running a Mount Vernon tent through the freezing months
Cold reaches the roots first. A tent on a floor over an unheated space, or against an outside wall, can sit well below the thermostat's setting on a January night. Lift containers off the floor, give seedlings a heat mat, and set the light period to cover the hours before dawn, so the lamp's warmth arrives when the house is coldest.
Heated air brings its own problem. January's 72 percent outdoor reading means little indoors: cold air holds little water, and a heated home runs dry. Clones and seedlings feel that first, so a dome or a small humidifier in the tent pays off from December through February. An unheated, damp basement is the exception, and there a small dehumidifier earns its place even in winter.
Summer reverses the gear. July averages an 86°F high, about 9 of its days reach 90°F, and July and August air both averaged 75 percent humidity. A spare room near The Avenue downtown or a house in Mount Vernon Heights trades the winter humidifier for a dehumidifier then, holding late flower near 45 to 50 percent, and the lamps move to the night hours.
The calmer months sit between. October averaged 64 percent humidity with highs near 66°F, and May runs near 72°F by day and 55°F at night. A run that flowers in fall, or one that starts in late spring, asks the least of your heater and your dehumidifier.
Heater safety: use one with tip-over and overheat shutoff, plug it straight into a wall outlet (not an extension cord or power strip), and keep it a few feet from tent fabric and plants.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 40 | 43 | 50 | 61 | 72 | 81 | 86 | 84 | 77 | 66 | 54 | 45 |
| Avg low °F | 27 | 29 | 35 | 44 | 55 | 64 | 71 | 69 | 62 | 51 | 41 | 33 |
| Humidity % | 72 | 68 | 75 | 75 | 72 | 64 |
Highs and lows: NOAA 1991 to 2020 normals, Bronx station (5.3 miles away). Humidity: Open-Meteo historical model data, average daily humidity in 2024, for the months shown. Planning averages, not a forecast.
Outdoor plants in Westchester County
New York lets each adult grow 3 mature and 3 immature plants, with no more than 6 mature and 6 immature per residence. Plants must be kept in a secure spot that no one under 21 can reach, and they cannot be plainly visible from public view, so privacy is part of any outdoor plan here.
If you can meet that, start seeds March 6 to March 20 and move plants out from April 17, when nights first average 45°F. The early fall frost date is November 2, about 199 days later, so the season itself is generous. Spring is the tight part: about 10 freezing nights still come in March, and the last spring frost has passed by April 12 in all but about one year in ten, so keep transplants indoors until the 17th.
| Last spring frost | Apr 1 in a typical year, Apr 12 to be safe (later only 1 year in 10) |
|---|---|
| First fall frost | Nov 16 typical, as early as Nov 2 (1 year in 10) |
| Frost-free season | about 230 days |
| Nights stay 50°F or warmer | May 2 to Oct 18 |
| Start seeds or clones indoors | Mar 6 to Mar 20 |
| Move plants outdoors | Apr 17 or later |
Your Mount Vernon grow, behind your own lock
Mount Vernon lives close together. Shoppers fill The Avenue around Petrillo Plaza, community celebrations gather at Brush Park and around Memorial Field, and the calendar brings Mount Vernon Proud Day and the Jamaican Independence Day Celebration. In a city that dense, a neighbor may hear a dehumidifier through the wall. Your grow journal is not how they learn more.
Canna GLAP encrypts your grow journal on your phone before it is uploaded. Someone who broke into our servers would come away with scrambled grow records and no key. The winter heat setup you worked out over a cold January stays with you.
What is encrypted: your plants, notes, photos, feed logs and harvests. What is not: account details (such as your email, name and plan), a grow name or town if you type one, your team, and your sensors' names. The full list: what a hacker would get.
Questions growers in Mount Vernon ask
When can I put cannabis plants outside in Mount Vernon?
From April 17, after starting seeds March 6 to March 20. Nights average 45°F or warmer from then until about November 3, and the early fall frost date is November 2.
Do I need a heater for a grow tent in Mount Vernon?
In winter, often. January lows average 27°F and about 67 nights a year reach freezing, so a heat mat for young plants and lamps that run through the coldest hours help keep roots warm.
Is humidity a problem for Mount Vernon growers?
In summer, yes: July and August both averaged 75 percent. In winter a heated home runs dry, so young plants may need extra humidity instead.
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