CannaGLAP
Grow cannabis in Annapolis, MD
Growing cannabis in Annapolis: summer nights that barely cool down
The usual fix for a hot tent is to run the light at night. In Annapolis that fix is weaker than it sounds. The police barracks station, 1.3 miles away at 25 feet, averages a July low of about 71°F and an August low near 70, and July air averages 74 percent humidity.
What happens to a tent when the coolest hour of the day is still 71°F, and damp?
Adults 21 and over: yes. Plant limit: 2 per adult; 2 per residence even with 2+ adults.
Not in public view; reasonable precautions against access by under 21s. Source: Criminal Law 5-601.2. Local rules (landlords, HOAs, city codes) can add more; this is a summary, not legal advice.
Cooling and drying an Annapolis grow
Count the hot afternoons: about 8 in June, 15 in July and 10 in August reach 90°F or more. With July nights only about 18 degrees below the high, a tent in a spare room near the historic district gains little from a night schedule alone. Air conditioning in the room does the real work, and it wrings water from the air as it cools, which matters here as much as the temperature.
The moisture keeps climbing into flower. August averages 76 percent and September 78, the dampest month measured, before October eases to 68. Plants flipped in midsummer ripen into exactly those weeks, so run a dehumidifier from the flip on and keep a fan pushing air under the canopy, not just over it.
With only 2 plants, the pull is to grow them huge. Big, dense colas hold moisture longest, so train each plant wide and flat into many smaller tops, and the September air has less to work with.
Winter is mild for a grow: January averages a 29°F low with about 22 freezing nights. A heat mat for seedlings and a lamp that runs through the coldest hours cover it. Only an unheated basement that stays damp needs the dehumidifier in winter.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 44 | 48 | 55 | 68 | 77 | 85 | 89 | 86 | 80 | 69 | 58 | 48 |
| Avg low °F | 29 | 31 | 38 | 48 | 57 | 67 | 71 | 70 | 65 | 52 | 41 | 34 |
| Humidity % | 75 | 64 | 74 | 76 | 78 | 68 |
Highs and lows: NOAA 1991 to 2020 normals, Annapolis Police Brks station (1.3 miles away). Humidity: Open-Meteo historical model data, average daily humidity in 2024, for the months shown. Planning averages, not a forecast.
A long Anne Arundel County season
Maryland allows 2 plants per adult and no more than 2 per residence even with two or more adults, kept out of public view and with reasonable precautions against access by anyone under 21.
Start seeds March 4 to 18 and plant out April 15; the safe last-frost date is April 9, and nights already average 45°F from April 6. The early first-frost date is November 1, about 200 days later, so heat and wet set the limits here, not frost. Give plants afternoon shade and moving air, water in the morning so leaves dry before those warm nights, and check inside the biggest buds every day through September.
| Last spring frost | Mar 27 in a typical year, Apr 9 to be safe (later only 1 year in 10) |
|---|---|
| First fall frost | Nov 13 typical, as early as Nov 1 (1 year in 10) |
| Frost-free season | about 234 days |
| Nights stay 50°F or warmer | Apr 22 to Oct 22 |
| Start seeds or clones indoors | Mar 4 to Mar 18 |
| Move plants outdoors | Apr 15 or later |
A small capital, a private grow
Annapolis is a city of about 41,000 with plenty of traffic passing through: state government staff, Naval Academy visitors, boaters tying up at City Dock. A neighbor in Eastport or off Main Street may know you grow. Your notes are another thing, since a 78 percent September put every line of them to the test.
Canna GLAP encrypts each journal entry on your phone before it syncs. Raid our servers and the Annapolis grow records sit there as ciphertext, with no key. Share a note with a grower in nearby Severna Park or Cape St Claire only if you want to.
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 Annapolis ask
Does running grow lights at night help in an Annapolis summer?
Some, but July nights still average about 71°F at the station 1.3 miles away. Air conditioning in the grow room, which also dries the air, does more.
When should I plant cannabis outside in Annapolis?
April 15 or later, with seeds started March 4 to 18. The safe last-frost date is April 9, and average nights reach 45°F by April 6.
How many cannabis plants can I grow in Annapolis?
Maryland allows 2 per adult, but no more than 2 per residence even with two or more adults.
Growing near Annapolis
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