The same bottle behaves differently in February than it does in July, and it is not your imagination or your memory. The chemistry genuinely changes.
Cold slows evaporation
A fragrance reaches you by evaporating off your skin. Cold air and cooler skin slow that down, so less material is leaving at any moment.
The result is a fragrance that projects less, seems quieter, and lasts longer. Nothing has weakened. It is being released more slowly.
The instinctive response is to apply more, and it is the wrong one. You are still wearing the same amount, and when you step into a warm room it will all arrive at once.
Which is why winter fragrances are built differently
If materials are evaporating slowly, a composition needs enough weight to still register. This is why cold-weather fragrances lean on resins, vanilla, woods, amber and spice: heavy materials that keep releasing steadily in conditions where light ones do almost nothing.
It is also why a bright citrus fragrance can feel like it has disappeared in January. It has not gone off. There is simply not enough energy to lift it.
The Danish version of the problem
Denmark has a large annual swing and a long dark half of the year, and indoor life makes it more complicated rather than less.
Outside it is cold and your fragrance is barely moving. Inside it is heated, dry and often quite warm, and everything you applied in the cold arrives at once. Coats and scarves hold fragrance for hours and release it in a rush when you take them off in a warm room.
The practical answer is to apply less in winter, not more, and to apply to skin rather than clothing.
Dry air
Heated indoor air is very dry, and dry skin holds fragrance poorly. This is the other half of why a fragrance seems to vanish in winter: it is not only the cold outside, it is the dehydrated skin inside.
Unscented moisturiser before applying makes a genuine difference, and it makes more difference in winter than at any other time of year.
What to wear
Something with weight in the base. Resins, soft woods, vanilla, oud. The heavier end of a range exists for exactly these months.
Oud Absolu is the heaviest thing HOUSE OF ZIGGIMAY makes and the longest lasting, which makes it a winter fragrance in practice whatever the label says. In July it can be a great deal; in January it is doing the job it was built for.
Applying it in the cold
Two practical adjustments make more difference than changing bottle.
Apply to skin under your clothes rather than to exposed skin. The inside of the wrist under a sleeve, or the base of the throat under a collar, stays at body temperature all day. Exposed skin in a Danish January is cold enough that very little is evaporating at all.
And apply before you dress rather than after, so the fragrance goes onto skin rather than onto wool. Scarves in particular hold fragrance for days and release it unevenly.
The indoor and outdoor problem
You are dressing for two climates several times a day, and the fragrance cannot know which one you are in.
Something applied at the right strength for a cold walk will be too much in a warm office twenty minutes later, because everything held back by the cold arrives at once in the heat. There is no way to solve this in the bottle, only in the dose.
Apply less than feels right on the way out. You will be indoors for most of the day, and that is where other people will encounter it.
The wardrobe question
Most people here end up with two rather than one, and that is a sensible response to a forty degree swing rather than indulgence. One lighter, one denser, and the calendar decides.
If you are choosing your first two, take the everyday one slowly and let the winter one be the second purchase. It gets fewer wearings and it is easier to choose once you know what you reach for.