The short answer
Drying is mostly about air “thirst” (humidity) and air movement (wind), not warmth alone. A crisp, breezy winter day can dry better than a mild but muggy one.
When cold outdoor drying works
- Low humidity (clear or crisp air).
- Breeze that can move through fabric.
- Enough daylight to make meaningful progress before evening dampness.
When it’s usually not worth it
- Still, damp air (foggy, grey, “wet cold”).
- Late afternoon starts in winter (not enough window left).
- Heavy loads (towels/bedding) unless conditions are unusually good.
Practical tip
On marginal winter days, aim for outdoor airing (breeze through fabric), then finish indoors with airflow. That combo often beats “indoors only” without risking overnight re-wetting.
More guides
Pollen, hay fever and line drying
What the pollen tile means, UK bands by type, and tips for sensitive households.
What is the best time of day to put washing out?
Morning vs afternoon drying, daylight, temperature, and dew.
Should you bring washing in before sunset?
Evening cooling, rising humidity, dew formation, and why washing can feel damp again.
Does laundry dry better on cloudy days?
Yes sometimes - if wind and humidity are favourable.
How to dry towels and bedding outside properly
Heavy-load tips: spacing, pegging, turning, and avoiding damp patches.
Why washing sometimes smells damp after drying outside
Slow drying, bacteria, detergent residue, and re-wetting.
Rain risk explained: when is it worth chancing the washing line?
Drizzle vs showers, probability, and short drying windows.
How to line-dry clothes faster: small changes that actually help
Actionable tips: extra spin, shake out, gaps, hangers, face into the breeze.
Why washing dries faster in wind than in sunshine
Why a breezy cloudy day can beat a still sunny one.
Humidity: the hidden reason washing stays damp
Relative humidity, dew point, and why “muggy” air is poor for drying.
Why does my washing smell like "outside"?
A UK guide to fresh vs musty line-dry smells.
Line-drying in 5°C ("freeze-drying")
What’s realistic near freezing, and tips that help.
Does UV light kill bacteria on clothes?
What sunlight can (and can’t) do for hygiene.