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Why does my car window fog up when it’s really cold in the winter as well as when it rains in the summer? What’s the best way to clear up the windshield?

Mark Sterling
Mark Sterling
Research Editor · Feb 14, 2026 · Updated Apr 13, 2026

Turn on the air conditioner (to dehumidify) and make it as warm as you're comfortable with. (Most cars now automatically turn on the AC when you turn the selector to Defrost, even if the AC light doesn't light…something to remember when you're trying to save gas or accelerate.)

49
Words

1 min
Read Time

#318
of 500 in Nature

-31%
vs Category Avg

The Short Answer

Turn on the air conditioner (to dehumidify) and make it as warm as you're comfortable with. (Most cars now automatically turn on the AC when you turn the selector to Defrost, even if the AC light doesn't light…something to remember when you're trying to save gas or accelerate.)

Analysis

Key Concepts: Turn, you're, light

This explanation focuses on turn, you're, light and spans 49 words across 2 sentences. At 31% below the average Nature explanation (71 words), the answer takes a direct, no-frills approach — sometimes the simplest explanation is the most effective.

What This Answer Covers

This is a focused, single-point answer that gets directly to the core of the question without detours.

How This Compares in Nature

Ranked #318 of 500 Nature questions by answer depth (top 64%). This is in the concise tier — a focused explanation that prioritizes clarity over exhaustiveness. Many readers prefer this level of directness.

Frequently Asked Questions

Is there a simple explanation for why my car window fog up when it's really cold in the winter as well as when it rains in the summer? what's the best way to clear up the windshield?

Turn on the air conditioner (to dehumidify) and make it as warm as you're comfortable with. (Most cars now automatically turn on the AC when you turn the selector to Defrost, even if the AC light doesn't light…something to remember when you're…

How detailed is this explanation compared to similar Nature questions?

This is a focused answer at 49 words, ranked #318 of 500 Nature questions by depth. The key concepts covered are turn, you're, light.

What approach does this answer take to explain my car window fog up when it's really cold in the winter as ?

The explanation uses direct explanation across 49 words. It is categorized under Nature and addresses the question through 1 analytical lens.