CannaGLAP
Grow cannabis in Azusa, CA
Growing cannabis in Azusa: the month the foothill heat switches on
Azusa's summer arrives all at once. At the foot of the San Gabriel Mountains, June brings about 7 afternoons that hit 90°F, July about 17 and August about 19.
So here is a question worth asking in May: was your cooling sized for the June you can see, or for the July that is coming?
Adults 21 and over: yes. Plant limit: 6 living plants per private residence, however many adults live there.
Locked space, not visible from a public place; cities and counties can set reasonable rules for indoor grows (but cannot ban them) and may ban outdoor grows; a landlord may prohibit growing on a rental. Source: Department of Cannabis Control; conditions: Prop 64 text as passed in 2016 (H&S Code 11362.2 and 11362.45). Local rules (landlords, HOAs, city codes) can add more; this is a summary, not legal advice.
An Azusa tent through the July jump
Size the exhaust for August. Its afternoons average about 92°F, and the Pomona/Fairplex station, 8.9 miles away at 999 feet, counts about 51 hot afternoons from July through September, most of the roughly 71 it sees in a year. From July into September, run the lights at night, when outside air averages about 60 to 63°F, so the worst of the afternoon falls in the dark period.
Those same months dry out. Outdoor humidity averaged 66 percent in June 2024, then 58 in July and 54 in August. Hot, dry air pulls water through leaves and out of pots faster, so a June watering routine falls behind by midsummer. Seedlings and new clones feel it first; a small humidifier for their first couple of weeks keeps them from stalling. These are outdoor readings, so they fit a garage or a room with open windows, not a closed, cooled room.
Winter here is mild, not frost-proof. The station logs about 3 nights a year at or below freezing, with December and January holding the bulk of them, and December nights average about 42°F. Keep the lights on at night in winter too, now for the opposite reason: the lamps warm a garage tent through the coldest hours, and a seedling mat covers young plants. January's 68 percent outdoor humidity matters only in an unheated, damp space; a heated room dries that air out.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 68 | 67 | 72 | 76 | 78 | 84 | 90 | 92 | 89 | 81 | 74 | 67 |
| Avg low °F | 43 | 45 | 47 | 50 | 54 | 57 | 62 | 63 | 60 | 54 | 47 | 42 |
| Humidity % | 68 | 66 | 58 | 54 | 59 | 50 |
Highs and lows: NOAA 1991 to 2020 normals, Pomona/Fairplex station (8.9 miles away). Humidity: Open-Meteo historical model data, average daily humidity in 2024, for the months shown. Planning averages, not a forecast.
Outdoors in Azusa and Los Angeles County
State law permits 6 living plants per private residence, however many adults live there, and they must be in a locked space that is not visible from a public place. Cities and counties can set reasonable rules for indoor grows, though not ban them, and may ban outdoor grows, so read the rules that cover your Azusa address first.
Where outdoor plants are allowed, photoperiod seeds belong indoors in the March 4 to 18 window, with planting out from April 15; autoflowers run on their own clock, so sow those roughly a week ahead of their move outside. Frost is unlikely to end this season; heat shapes it. Plants spend July through September in the hottest stretch, then finish in an October that averaged 50 percent humidity in 2024, drier than any other month in the readings, with about 5 hot afternoons.
| Frost | Rare: about 2.7 freezing nights a year |
|---|---|
| Nights stay 50°F or warmer | Apr 18 to Nov 2 |
| Start seeds or clones indoors | Mar 4 to Mar 18 |
| Move plants outdoors | Apr 15 or later |
A college-town grow, kept to yourself
Azusa is a college town, home to Azusa Pacific University. If you share a rental with roommates, or chat with neighbors at Azusa Golden Days or the Downtown Azusa Night Market, your grow does not have to come up. No app can hide a fan's hum or a smell through the fence; an app can decide who reads your records.
Canna GLAP scrambles each journal entry on your phone before it travels, and the one key that unscrambles it answers to your passphrase alone. A thief inside our servers would haul off ciphertext: grow records with no way to turn them back into words. The August schedule that finally kept your canopy cool stays your edge.
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 Azusa ask
When does an Azusa grow room get too hot?
From July through September, as a rule. Those three months carry most of the year's hot afternoons, so run the lights at night then, and expect an uninsulated garage to need an air conditioner on top of a strong exhaust fan.
Does it freeze in Azusa?
Rarely. The Pomona/Fairplex station averages a few freezing nights a year, and from February 21 to November 26 the typical night holds at 45°F or above.
When can I plant cannabis outside in Azusa?
From April 15, if the local rules for your address allow outdoor plants and yours are locked away out of public view. Average nights reach 50°F only from April 18, so growth may start slowly.
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