CannaGLAP
Grow cannabis in Plainview, NY
Growing cannabis in Plainview: the cool basement that turns damp in summer
In Plainview, the coolest room in July can also be the dampest one. Outdoor humidity averaged 76 percent in July and August 2024 and 75 in September. When that air settles into a basement a few degrees cooler than the yard, it carries the same water at a lower temperature, and its humidity reading climbs.
A basement keeps a lamp's heat in check. It may also be handing your buds the wet air bud rot looks for. So which number did you check down there last summer, the temperature or the humidity?
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.
A Plainview basement tent through the year
These figures come from the Farmingdale airport station, 4.3 miles away. July averages an 83°F high and a 68°F low, and only about 9 days a year reach 90°F or hotter, so damp is the bigger summer job indoors. Size a dehumidifier for the whole basement, not just the tent, and set it on a humidistat, a switch that runs it to a set humidity. Give it a drain hose so it keeps running overnight instead of stopping when the bucket fills.
An air conditioner upstairs dries only while it runs, and it can sit idle on a mild August night. Pull the tent's intake from the dehumidified room, not from a window. The lamp helps a little: warm air reads drier, so a lit tent usually reads drier than the room around it, which makes the first hours after lights out the ones to watch.
September asks for the most care. Outdoor air averaged 75 percent that month, right when a run flipped (switched to flower) in July is in its densest weeks. October's 67 percent is easier, so a run timed to ripen in October meets drier air, at the cost of colder nights that ask more of your heat.
Come winter, cold takes over from damp. The station averages about 88 freezing nights a year, with January lows near 25°F. A heated house dries the air, so January's 72 percent outdoor reading fades upstairs; an unheated, damp basement is the one place a winter dehumidifier still earns its keep. Run the lamp through the coldest hours and set seedlings on a mat, not bare concrete.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 39 | 41 | 48 | 58 | 68 | 77 | 83 | 82 | 75 | 64 | 53 | 44 |
| Avg low °F | 25 | 26 | 33 | 42 | 51 | 61 | 68 | 67 | 60 | 48 | 38 | 31 |
| Humidity % | 72 | 70 | 76 | 76 | 75 | 67 |
Highs and lows: NOAA 1991 to 2020 normals, Farmingdale Airport station (4.3 miles away). Humidity: Open-Meteo historical model data, average daily humidity in 2024, for the months shown. Planning averages, not a forecast.
Plainview outdoors, under New York's rules
New York asks for a secure location that anyone under 21 cannot reach, out of plain sight of the public. Where that works, start photoperiod seeds (the kind that flower when nights lengthen) March 14 to 28 and plant out from April 25, when the average night reaches 45°F. Autoflowers need only a week or so indoors first. The last frost typically comes around April 6, and after April 20 in one spring in ten.
That leaves about 183 days before the early first frost of October 25. Average nights fall below 50°F after October 11, and September's damp lands in the middle of flower. So choose airy, mold-resistant plants, space them wide, and pull apart a few of the largest buds each week from September on.
| Last spring frost | Apr 6 in a typical year, Apr 20 to be safe (later only 1 year in 10) |
|---|---|
| First fall frost | Nov 6 typical, as early as Oct 25 (1 year in 10) |
| Frost-free season | about 213 days |
| Nights stay 50°F or warmer | May 11 to Oct 11 |
| Start seeds or clones indoors | Mar 14 to Mar 28 |
| Move plants outdoors | Apr 25 or later |
Your Plainview grow, on your terms
Plainview is a residential hamlet on the southern edge of the Town of Oyster Bay, and a basement can get visitors: a plumber, a friend from nearby Syosset, a relative staying the weekend. Not one of them needs to see your grow log.
Each Canna GLAP grow record is encrypted on your phone before it uploads. Break into our servers and you would leave with grow records in scrambled form and no key to open them. The journal is the part we can hide; a locked door and a carbon filter cover the rest.
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 Plainview ask
Do I need a dehumidifier for a basement grow in Plainview?
For summer flower, usually yes. Outdoor humidity stayed in the mid 70s from July through September 2024, and cooler basement air reads damper still. In winter, only an unheated, damp basement needs one.
When should I start cannabis seeds in Plainview?
Start photoperiod seeds indoors March 14 to 28 and plant out from April 25. Autoflowers run on their own clock, so seed them around a week before setting them in the ground.
When is the first frost in Plainview?
Typically around November 6 at the Farmingdale airport station, but by October 25 in one fall in ten. Plan outdoor plants to finish before late October.
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