Greenhouse Humidity Monitoring Dashboard

The default band is 60–80% RH for many crops (lower to suppress fungal disease, tuned to crop and stage). Treat it as a sensible starting point — your own specification, regulator, equipment manual or product datasheet sets the authoritative limits, and you can read your true band straight off the worst case those documents allow. Edit the readings against whatever band applies to you.

Vapour-pressure deficit (VPD) — the drying power of the air — drives transpiration and nutrient uptake, and it depends on both temperature and humidity, which is why growers increasingly target VPD rather than RH alone. Too-high humidity (low VPD) slows transpiration and invites fungal disease; too-low humidity (high VPD) stresses plants and closes stomata. Keep RH in band for your crop's VPD target, prioritise breaking the overnight high-RH/wet-leaf window, and ensure air movement so no still, saturated pockets form.

Match the interval to the consequence and the rate of change: where an excursion spoils product or risks safety, log continuously (or as often as you can sample); where it is merely informative, daily or per-shift spot checks suffice. The in-range % and excursion count only mean something if your sampling is regular — sparse, irregular readings hide the excursions between them.

Yes — every reading is stored in this browser's localStorage on your device and nothing is uploaded to any server, which also makes the dashboard usable on sites with strict data policies. For shared, audit-grade records across a team or for regulatory retention, export the values into your own system.