Humidor Humidity: The 65–70% Rule and Why It Matters

1. The 65–70% rule (and the old "70/70")

For decades the rule of thumb was "70/70" — 70% relative humidity at 70°F (about 21°C). It still works, but tastes have shifted. Many experienced smokers now aim a little lower, around 65% RH, because a slightly drier cigar burns cooler, holds a firmer ash and often tastes cleaner. A sensible target is a window of 65–70%, at 18–21°C.

The key isn't hitting one magic number — it's stability. A humidor that drifts between 62% and 74% stresses the cigars far more than one that sits calmly at a steady 66%.

2. Why humidity matters so much

Tobacco is hygroscopic: it constantly gives up or takes on moisture from the air around it. That single fact explains almost everything about storage.

• Too dry (below ~62%): oils evaporate, the wrapper cracks, the cigar burns hot and fast, and flavour goes flat and bitter.
• Too humid (above ~72%): the draw tightens, the cigar burns unevenly, and you risk mould and even tobacco beetles — the nightmare of any collection.
• Just right (65–70%): an even burn, a smooth draw, a firm grey ash and the full, intended flavour.

3. Seasoning a new humidor

This is the step beginners skip — and then wonder why their cigars dry out. A new wooden humidor is thirsty. If you put cigars straight in, the bare Spanish cedar pulls moisture out of them for weeks.

Seasoning means charging that wood with moisture first. The clean, modern method:

1. Place a dedicated seasoning pack (often 84% RH) — or a shot glass of distilled water, not touching the wood — inside the empty humidor.
2. Add a hygrometer, close the lid, and leave it.
3. Wait until the humidity climbs and holds steady — typically 2 to 14 days depending on the humidor.
4. Swap the seasoning pack for your normal humidification, then add cigars.

Never wipe the interior with a dripping wet cloth: over-wetting the cedar warps it and invites mould.

4. Hygrometers: measure before you trust

You cannot manage what you don't measure. A digital hygrometer is more reliable than the cheap analog dial that ships with most humidors — and those dials are often wrong out of the box.

Calibrate it with the salt test: seal the hygrometer in a bag with a bottle cap of salt moistened into a paste for 6–8 hours. It should read 75%. If it reads 70%, your device runs 5% low — note the offset and adjust your readings accordingly.

5. Choosing your humidification

You have three main options, from easiest to most hands-on:

• Two-way humidity packs (e.g. Boveda-style): the simplest and most consistent choice. They hold a fixed RH and both add and absorb moisture. Pick the percentage you want (65% or 69%) and size it to your humidor's volume.
• Gel or crystal beads: refillable with distilled water, affordable, and stable once dialled in.
• Floral foam / sponge units: the old default; cheap but prone to over-humidifying and mould. Easy to outgrow.

Whatever you choose, use distilled water only — tap water carries minerals and bacteria that foul the media.

6. Holding steady humidity year-round

Once you're dialled in, the enemy is change. Keep the humidor out of direct sunlight and away from radiators, windows and air conditioning. Don't open the lid a dozen times a day — every opening swaps your conditioned air for room air. Winter heating dries a room dramatically, so expect to top up humidification more often in the cold months.

If you keep a real collection, it pays to know what you're storing and for how long. Logging each cigar — brand, vitola, box date, quantity — turns a drawer of sticks into a managed cellar. (That's one reason the Cigar Taste app includes humidor tracking with quantities, factory codes and total collection value.)

7. Common mistakes

• Never seasoning the humidor. The number-one cause of mysteriously dry cigars.
• Trusting the stock analog dial. Calibrate, or switch to digital.
• Over-humidifying to "be safe". Above 72% is where mould and tight draws live. Drier is safer than wetter.
• Tap water. Always distilled.
• Ignoring the seasons. Your room's air changes; your humidor's needs change with it.
• Cramming it full. Air needs to circulate. A rammed humidor holds uneven humidity.

Frequently asked questions

Cigar Taste is a tasting-journal application. This article is educational and intended for adults of legal smoking age (18+, or the legal age in your country). The app does not sell, distribute or promote any tobacco product. Tobacco use is harmful to health.