What to wear by temperature

What to wear in 40 degree weather

40°F is about 4°C

40°F is cold but not freezing: no ice from the air itself, but it bites as soon as the wind picks up. My call is a proper coat, a puffer or a wool coat, with a sweater or long sleeve under it. Gloves and a hat earn their place if you are out for long or it is windy.

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The 40°F kit, as I see it

Puffer or wool coat
Sweater, hoodie or long sleeve underneath
Jeans or warm trousers
Gloves and a hat for longer outings

What 40°F feels like in the wind

10 mph wind: feels like 34°F
20 mph wind: feels like 30°F

What I think of 40 degree weather

40°F is cold with nothing to show for it. All the suffering, none of the snow photos.
Forty degrees: too cold for optimism, too warm for anything interesting to happen.
At 40°F the puffer stops being a fashion choice and becomes a personality.

Where 40°F is a normal winter afternoon

Where 40°F is a normal winter night

Questions

Is 40 degrees cold?

Yes, for most people. 40°F is eight degrees above freezing, and with a breeze it feels closer to freezing.

What is 40°F in Celsius?

40°F is about 4°C.

What to wear running in 40 degree weather?

Runners’ rule of thumb says a run feels about 15 to 20°F warmer than the reading, so 40°F running feels like a 55 to 60°F day: long sleeves, tights or shorts if you run warm, and light gloves.

Weather by name

City figures: NOAA U.S. Climate Normals, 1991 to 2020. Wind chill: the National Weather Service formula.

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