Every spring the same phenomenon plays out: a Dutch person in shorts at 14°C, a tourist from Southern Europe watching in disbelief. The Dutch person isn't performing toughness — their body genuinely feels the temperature differently.
How cold acclimatisation works
After months of winter cold, the body adapts. Blood vessels near the skin become more responsive — they constrict more efficiently in cold to reduce heat loss from the surface. The threshold at which your body perceives "cold" shifts. What felt cold in October starts to feel normal by March.
This is not the same as being immune to cold. It's a calibration: the Dutch person in shorts at 14°C would also feel cold if suddenly transported to 14°C after weeks in a warm climate.
The spring baseline effect
The first warm days of spring arrive after months of 5–10°C. When 15°C appears in April, it's 10 degrees warmer than the recent average. Relative warmth matters as much as absolute temperature. 15°C in April after a cold winter feels warm. 15°C in October after a warm summer feels cold.
Why visitors see it differently
Someone arriving from a country where the average is 25°C experiences 15°C as genuinely cold. Their body hasn't adapted. Both people are accurately reporting their experience.
| Background | Shorts threshold (air temp) |
|---|---|
| After Dutch winter | ~13–15°C |
| After Mediterranean summer | ~20–22°C |
| Year-round mild climate | ~17–19°C |
Can you wear shorts today?
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Does acclimatisation have limits?
Yes. Below about 10°C, even well-acclimatised people find shorts uncomfortable without significant physical activity. The adaptation shifts the threshold, it doesn't eliminate the cold response.
Learn more
Read next
Can I wear shorts at 12 degrees? Usually too cold
12°C (54°F) is too cold for shorts for most people. In full sun with no wind it can feel like 17°C, and then it's just about doable.
Can I wear shorts at 15 degrees? Only in the sun
15°C (59°F) is the tipping point. In sun with no wind it feels like 20°C and shorts are fine; overcast and windy it feels like 11°C.
Can I wear shorts at 17 degrees? With sun, yes
At 17°C shorts work, but only with sun or little wind. Overcast with a steady breeze it feels like 13°C, and long trousers are the better call.
Can I wear shorts at 18 degrees? Yes, if it's sunny
18°C (64°F) is shorts weather when the sun is out: it feels like 23°C. Overcast and windy it feels like 14°C and trousers are the better call.
Why 20 degrees is not always shorts weather
20°C sounds like it should be comfortable. And often it is. But add enough wind or cloud cover and it stops feeling that way fairly quickly.