What humidity should a humidor be? An argument for 65

TL;DR. 70% RH is the cigar world’s default out of tradition, not evidence. For most modern smokers in temperate climates, 65% gives a better burn, a better draw, and a real safety margin against mold and beetles. Stay above 65% only if your collection is wrapper-heavy, your room runs cold, or the cigars are years from being smoked.

An enthusiast once kept a small Daniel Marshall running at 65% RH for nine years. But those first five years? That was the hard part. Those early attempts at 70% left a lot of split Cameroon in their wake. The real story isn’t just “65% is better”—it’s how someone had to work it out the messy way, by trial and error and frustration, before realizing the internet’s confident nod toward 70/70 just didn’t fit their actual room and climate.

If you’re reading this because you searched for an answer, the internet has probably already told you it should be 70/70 (70°F and 70% RH). Or maybe 65. Or 62. Pick any guide that shows up first, and you’ll get three different answers. And they can’t all be right, but here’s the thing: they’re also not all wrong. The reason there’s no universal answer is that there really can’t be one. The good news? You can still land on your own number pretty quickly, with just a couple of facts about your specific situation. And I promise the math is way simpler than the cigar magazines make it sound.

Where 70% came from

Cigar storage tradition descends from Cuban tobacco-field practice, where 70-ish percent RH at warm temperatures keeps the harvested leaf supple for processing. The same number got carried across the supply chain (into aging rooms, then factory humidors, then retail humidors, then home humidors) and, somewhere along the way, became the default written on the back of every entry-level wooden box and every introductory cigar-storage guide^[4].

It’s not wrong. It’s unspecific. 70% RH at the field temperature of a Pinar del Río warehouse is a different physical environment than 70% RH in a desktop humidor in an air-conditioned Stockholm office. The previous post on VPD covered why. Same RH at different temperatures means different absolute moisture, different drying pressure on the wrapper. A number that means “ideal” in one room can mean “marginal” in another and “actively risky” in a third.

Where the modern argument is going

Read the cigar press carefully and the consensus has been drifting downward for a decade. Not the entry-level guides; the working writers and the experienced retail community. Halfwheel’s reader-question column treats 65% as a sensible default and walks readers up or down from there based on climate and wrapper preference^[2]. The Famous Smoke “70/70 myth” article puts it plainly: at typical North American summer indoor temperatures, 70% RH is too humid by both burn quality and beetle-risk measures^[1].

Two industry signals point the same way. Boveda, the dominant humidity-pack in the cigar market, sells 62%, 65%, 69%, 72%, and 75% packs^[7]. Their B65 is officially “for those who prefer a drier cigar profile and/or easier burn; good for long-term aging.” Their B72 is “for those who prefer a higher moisture profile and/or have trouble maintaining the desired RH.” The manufacturer ships five tiers, not one, and writes preference-based descriptions rather than a universal recommendation. That’s not marketing. That’s an admission. Second signal: factory humidors at major manufacturers run drier than the retail-tradition 70%, often closer to 65%, because that’s where their cigars survive transport best.

The retail pressure to keep saying “70/70” is real. Simplest answer for a casual buyer; nobody unhappy on day one. But that’s not where serious storage is heading.

The wrapper variable

Wrappers don’t all behave the same way at the same RH. Connecticut shade and Cameroon are thin, oily, and elastic only inside a narrow moisture window. At 70% RH in a warm room, that kind of wrapper soaks up excess moisture, swells, and then cracks at the cap when you cut or light it. Or, worse, halfway through the smoke, when the cigar’s own heat drives the absorbed water out faster than the wrapper can release it.

I’ve watched this happen on my own Cohibas in summer. I’ve read it described over and over: wrappers splitting halfway through, caps cracking on light, with a calibrated storage hygrometer reading a perfectly defensible number. It’s consistent enough that it’s part of why retail factories ship drier than they store. Thin-wrapper cigars survive 65% RH transport better than 70%.

Maduros, broadleafs, thick-wrapper cigars in general: forgiving. They’re fine at 70%. They’re also fine at 65%. The asymmetry is why a single-target storage strategy covering both wrapper families should err toward the more sensitive cigars. Which means lower.

The temperature variable, again

If you read post 1 you already know the punchline. Same RH plus higher temperature equals higher VPD equals more drying pressure equals higher beetle and mold risk. The implication is simple. As your humidor’s average temperature climbs, your target RH should drop.

Practical numbers, conservatively rounded:

That’s the whole heuristic. Your hygrometer reading doesn’t change just because the AC clicked off; the meaning of the reading does. You compensate by adjusting the target.

The Halfwheel climate-question piece makes the same point in different words: where you live is part of the answer^[3]. A storage target tuned for Phoenix is wrong for Edinburgh, and vice versa, even at the same hygrometer reading.

Aging vs ready-to-smoke

One more variable, underdiscussed: are you aging or storing-to-smoke?

Aging cigars you don’t intend to smoke for years? Cooler temperatures (15–18°C) and lower RH (62–65%) slow the chemistry without compromising the leaf. The cigar settles into long-term moisture equilibrium. The volatile compounds you want to develop get time to develop, without microbial competition.

Storing cigars you’ll smoke this month? Same range works, but you have more freedom toward the upper end (67–70%) if your room is on the cool side and your wrappers are thick. The cost of being slightly humid is mostly forgiven on cigars that won’t be there long.

Doing both in the same humidor? Prioritize the aging conditions. The to-smoke-soon cigars adjust to slightly drier storage in a few days. Wrappers don’t come back from years at the wrong moisture.

What I run, and why

The Daniel Marshall lives at 18–20°C and 65% RH year-round. Calibrated 65% Boveda packs, a Govee sensor reporting to The Cabinet’s dashboard, one check every morning over coffee. RH, temperature, VPD, dew-point margin: one view. “Is the box doing what it should?” answered in a glance instead of a guess. Mid-temperate European room. Summer occasionally pushes the box to 22°C and I let RH ride down to 63% for those weeks rather than fighting it.

The travel humidor runs the same target with smaller packs. The small cabinet (maduros almost exclusively) sits at 67% by deliberate choice. The wrappers want it, the cigars are years from being smoked, the math allows it.

If a friend asked me what to set their first humidor at in Western Europe or coastal North America, I’d say 65% at 19–20°C. Boveda 65, calibrated digital sensor, two-point salt test on the sensor at setup, one boring visual check a week. That’s enough.

How to find your own number

If you don’t yet trust a single answer, three weeks of data will get you there.

1. Pick a starting target based on the table above.
2. Run it for three weeks. Don’t change anything. Smoke a cigar from each box at the start and at the end of the three weeks.
3. If wrappers are cracking on cut or light, you’re too dry. Move up 2–3 points.
4. If draws are tight, burns are wonky, or anything tastes musty or mushy, you’re too humid. Move down 2–3 points.
5. If both ends of the spread test smoke well, you’re done. Stop adjusting.

Most people end up between 62% and 67%, which is what the Boveda product line’s most popular two tiers (65 and 69) bracket on either side of 65 itself.

One last note: trust your sensor’s placement, not just its calibration. The CigarPass forum has a beautiful case where moving the hygrometer to the opposite side of a 50-count humidor (without changing anything else) dropped the reading from 68% to 64% overnight^[5]. The hygrometer was honest. The humidor wasn’t a single climate. If you’re storing more than a desktop’s worth of cigars, run more than one sensor. The Cabinet shows you the spread between sensors so you can see how big your box’s gradient actually is, and target your humidification where it matters.

The real answer to “what humidity should a humidor be” isn’t a number. It’s a band, calibrated to your temperature, your wrappers, and how patient you are. 65 is where most people, in most rooms, with most cigars, settle if they actually measure for a few months. Which is why I argue for it as the default. Pick 65. Run it for three weeks. Adjust from there. The folk wisdom drifted to 65 the long way, by trial and error and a million cracked Cameroons. We can take the shortcut.

— Roger