3 Canadian climate zones and what each means for storing miniature materials

What to take away

Three Canadian storage climates and how they were divided

Canada does not have one storage climate. It has at least three that matter to anyone keeping wood, paper, adhesives or paint on a shelf through a full year.

The division is not political and not based on province lines alone. It comes from how temperature and humidity move together across the country. Environment Canada publishes the underlying climate data, and it shows a clear split between continental interiors, coastal margins and the spaces in between.

I grouped regions by two questions. How cold and dry does the air get in January? How wet does it get in July and through the shoulder seasons? Those two answers predict most of what happens to a stored kit.

The three zones are:

Saskatchewan, the territories and northern Ontario follow the cold dry zone in winter, with a shorter and milder summer swing.

Provincial boundaries do not follow these lines exactly. A workshop in Windsor, Ontario behaves more like the continental swing than one in Thunder Bay. A basement in Halifax behaves differently from a top-floor flat in the same city.

Use the zone as a starting point, then adjust for your building. A heated, sealed room is its own microclimate, and a garage or shed is another.

Treat your shelf as a small environment, and the rules become practical rather than fussy.

If you are still deciding what belongs on the shelf in the first place, our guide to how to choose materials covers the trade-offs between wood, resin, card and clay.

Climate one: cold dry winters, using Ontario and Alberta examples

Ontario and Alberta share a pattern: hot, humid summers followed by long, dry, cold winters. Indoor air in January is often drier than any desert.

A Toronto apartment with forced-air heating can drop below 20 per cent relative humidity in February. A Calgary basement can do the same, and faster, because the outdoor air starts dry.

That dryness is the main threat. Basswood strips cup and twist. Balsa cracks along the grain. Water-based paints skin over in the jar. White glue thickens and eventually sets solid.

Wood moves most. A sheet that was flat in July can bow by December, and it will not flatten again cleanly in spring.

Paper and card behave similarly. Inkjet-printed wallpaper sheets curl at the edges. Cardstock delaminates if it was glued with a water-based adhesive.

Adhesives suffer in two ways. They lose solvent to the dry air, and they thicken. Cyanoacrylate goes stringy. PVA skins over. Epoxy resin crystallises in the bottle.

Summer brings the opposite problem. A Hamilton garage can hit 80 per cent relative humidity in August, which softens glued joints and encourages mould on paper.

So the cold dry zone is really a two-season zone. You are managing desiccation from November to March and damp from June to September.

Home heating drives much of the winter dryness. Natural Resources Canada publishes guidance on energy efficiency for homes, and the same heating that keeps you warm pulls moisture out of the air and out of your stock.

Small electrical parts are part of many dioramas, and our notes on diorama lighting storage cover how to keep them dry alongside the rest of your stock.

Climate two: coastal damp, using Nova Scotia as the example

Nova Scotia is the clearest Canadian example of the coastal damp zone. Halifax averages high humidity year round, and fog is a normal summer visitor.

Winter is milder than Ontario or Alberta, but it is not dry. Relative humidity indoors often sits above 50 per cent even in February, and higher near the coast.

That changes what fails first. Instead of wood drying out, wood swells. Instead of paint skinning over, paint films stay open and attract dust.

Mould and mildew are the real risk. Paper, card, fabric and leather-backed items can develop surface mould within weeks in a damp basement.

Metal parts corrode faster. Pins, wire, photo-etched brass and steel tool blades all show rust sooner in Halifax than in Calgary.

Adhesives behave differently too. PVA stays workable longer, which sounds helpful until you realise a glued joint may never fully cure in a damp room.

Salt air adds a second layer. In towns right on the shore, airborne salt accelerates corrosion on any exposed metal.

Summer is humid without being hot, which is the worst combination for stored organics. Warm, damp air is what mould wants.

Ventilation matters here, and so does the safe handling of any solvents or adhesives you keep. The Canadian Centre for Occupational Health and Safety covers chemical hazards, including how storage and ventilation interact.

If you keep a stash of small decorative parts, our piece on miniature room ideas storage explains how to keep them dry and sorted at the same time.

Climate three: continental swing (middle ground) and where it applies

The continental swing is the zone most Canadian makers actually live in, even if they assume they are in one of the extremes.

It covers interior British Columbia, the Okanagan and Thompson valleys, the Kootenays, southern Manitoba, much of southern Quebec, and sheltered pockets of southern Ontario away from the lakes.

Kelowna is a good example. Winters are cold but short. Summers are hot and dry. Humidity swings widely without sitting at either extreme for months.

The same applies to Montreal, where indoor humidity moves through a wide range across the year but rarely stays punishing for long. In the continental swing zone, winter indoor relative humidity often bottoms out at 25 to 35 per cent in January, then climbs through spring.

In this zone, the damage is slower and more cumulative. Nothing fails dramatically in a single season, which makes it easy to miss.

Wood moves a little each season and gradually loses flatness. Paper cockles. Adhesives thicken slowly. Metal takes a year or two to show corrosion rather than a few months.

The practical consequence is that continental swing storage rewards consistency more than protection. Keeping conditions steady matters more than keeping them at any particular number.

A basement in this zone is usually the best room in the house for storage, provided it stays dry. An unheated garage is the worst, because it swings with the outdoor air.

If you sell finished miniatures, a storage record doubles as a business record, and our guide to the business number for selling miniatures canada explains the filing side.

Temperature and humidity rules for each climate

Numbers help, but only if you treat them as ranges rather than targets. Here is how the three zones compare.

The cold dry zone needs added moisture in winter and removed moisture in summer. That is two different jobs, and one humidifier or dehumidifier will not do both.

Aim for 40 to 50 per cent relative humidity in the cold dry zone. Below 35 per cent, wood and paper suffer. Above 60 per cent in summer, mould becomes a risk.

The coastal damp zone needs continuous moisture removal, not seasonal. A dehumidifier running through the year is normal there, not excessive.

Aim for 45 to 55 per cent in the coastal zone. Below 40 per cent is rare and usually only happens with aggressive heating.

The continental swing zone needs gentle correction in both directions. A small dehumidifier in summer and a room humidifier in the driest weeks will usually hold the range.

Temperature matters less than humidity for most materials, but it matters for adhesives and resins. Heat accelerates curing, so a shelf above a radiator is a bad choice in every zone.

The Canadian Centre for Occupational Health and Safety lists temperature and humidity among physical hazards, which is a useful reminder that these are measurable conditions, not vague worries.

Measure rather than guess. A cheap digital hygrometer in each storage area tells you more than any general rule.

Box sealing, desiccants and label rules for each climate

Boxes are your second line of defence after room conditions. How you seal them depends on which way the moisture is moving.

In the cold dry zone, you are keeping moisture in during winter and out during summer. That means sealed boxes with a small desiccant pack in summer, and sealed boxes with nothing added in winter.

In the coastal damp zone, you are always keeping moisture out. Every box gets a desiccant, and every box gets a gasket or a tight lid.

In the continental swing zone, you are buffering. Sealed boxes with a desiccant changed twice a year is usually enough.

Use these typical starting ranges, then adjust with a hygrometer. In the coastal damp zone, use 10 to 20 g of silica gel per litre of sealed box volume. In the continental swing zone, use 5 to 10 g per litre. In the cold dry zone in summer, use 5 g per litre.

Desiccants are not permanent. Silica gel saturates and then stops working, and in a damp climate that can happen within weeks.

Use indicator silica gel where you can. The colour change tells you when to recharge or replace it, which beats guessing.

Rechargeable silica gel can be dried in an oven and reused. Single-use packs go in the bin. Either way, write the date on the pack.

Labels matter more than most people expect. A box sealed in 2026 and opened in 2028 needs to tell you what is inside and when it was packed.

Write three things on every label: contents, packing date, and desiccant status. That is enough to run an audit later without opening everything.

For glues, paints and solvents, safe storage is a separate question from moisture. The Canadian Centre for Occupational Health and Safety explains WHMIS and safety data sheets, which is where you find the storage and ventilation requirements for the products you use.

Keep solvents out of sealed boxes entirely. They need ventilation, not isolation, and they should never share a container with paper or fabric.

If you store repair materials, sort them by how easily the work can be undone; our piece on repair materials explains that sorting.

A checklist for packing a box in any zone:

A storage audit you can run twice a year

Run the audit in spring and autumn. Spring catches winter damage. Autumn catches summer damp before it sits through the heating season.

Each audit takes an hour or two for a normal hobby stash. It is cheaper than replacing a warped sheet of basswood or a ruined bottle of resin.

Start with the room, not the boxes. Check the hygrometer reading and compare it against the range for your zone.

Then work through the shelves. Look for cupping in wood, cockling in paper, skinning in adhesives and corrosion on metal.

Open one box per category rather than all of them. If the sample is fine, the rest usually are too.

Check desiccant packs. Replace or recharge any that have changed colour or passed their written date.

Finish by updating your labels and your audit list. Note anything that failed and what you changed, so next season's audit has a baseline.

If you sell finished pieces or kits, keep records of what you store and where. The Canada Revenue Agency treats hobby income and small business income differently. The Canadian Border Services Agency applies duties and taxes to imported kits and tools, so a written storage record doubles as a business record.

Measurement Canada rules matter if you ever sell materials by length or volume, and Health Canada publishes safety guidance for craft adhesives and small parts. None of that changes how you store things, but it does change what you need to write down.

Common questions