dew point: meaning, definition, pronunciation and examples
B2-C1Technical / Scientific / Weather reporting
Quick answer
What does “dew point” mean?
The temperature at which air becomes saturated with water vapour, causing condensation and dew formation.
Audio
Pronunciation
Definition
Meaning and Definition
The temperature at which air becomes saturated with water vapour, causing condensation and dew formation.
In meteorology and climate science, it is a crucial measure of atmospheric humidity and potential for fog, frost, or precipitation. In HVAC and industrial contexts, it indicates conditions for condensation on surfaces.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Spelling follows regional norms (e.g., 'humidity' vs. 'humidity' in context). The concept and term are identical.
Connotations
Identical technical connotations. In everyday US weather reports, 'dew point' is more frequently cited as a comfort indicator than in UK forecasts, which may emphasise 'humidity' or 'feels like' temperature.
Frequency
Higher frequency in American media weather segments. In the UK, it is common in meteorological publications but less frequent in casual forecasts.
Grammar
How to Use “dew point” in a Sentence
The dew point is [value/adj].[Subject] has a dew point of [value].When the temperature drops to the dew point, [consequence].Vocabulary
Collocations
Examples
Examples of “dew point” in a Sentence
verb
British English
- The air will dew-point by midnight.
- The surface is dew-pointing.
American English
- The temperature is expected to dew-point tonight.
- If it dew-points, frost will form.
adverb
British English
- [Not standardly used as an adverb]
American English
- [Not standardly used as an adverb]
adjective
British English
- We need a dew-point calculator.
- The dew-point reading was crucial.
American English
- Check the dew-point forecast.
- High dew-point air is uncomfortable.
Usage
Meaning in Context
Business
Used in agriculture, logistics (for cargo sweating), and HVAC system specifications.
Academic
Central in meteorology, climatology, and physics papers on phase change and atmospheric thermodynamics.
Everyday
Primarily in weather forecasts and discussions about humidity, comfort, and frost formation.
Technical
Precise term in engineering (HVAC, aerospace), industrial drying, and environmental monitoring.
Vocabulary
Synonyms of “dew point”
Vocabulary
Antonyms of “dew point”
Watch out
Common Mistakes When Using “dew point”
- Using 'dew point' as an adjective without a hyphen (e.g., 'dew point temperature' is accepted, but formal writing prefers 'dew-point temperature').
- Confusing it with 'humidity percentage'.
- Treating it as uncountable (e.g., 'There is a lot of dew point today' ❌).
FAQ
Frequently Asked Questions
No. Dew point is a temperature value indicating saturation. Relative humidity is a percentage of how full of moisture the air is compared to its maximum at that temperature.
No. By definition, the dew point is the temperature to which air must be cooled to become saturated. It cannot exceed the current air temperature.
A higher dew point means more moisture in the air, which reduces the effectiveness of sweating and makes hot weather feel muggier and more uncomfortable.
Pilots and meteorologists use it to predict the likelihood of fog, icing conditions on runways, and cloud formation, which are critical for flight safety.
The temperature at which air becomes saturated with water vapour, causing condensation and dew formation.
Dew point is usually technical / scientific / weather reporting in register.
Dew point: in British English it is pronounced /ˈdjuː pɔɪnt/, and in American English it is pronounced /ˈduː pɔɪnt/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[No common idioms. It is a technical term.]”
Learning
Memory Aids
Mnemonic
Imagine morning DEW forming on a POINTed leaf tip when the air becomes saturated. DEW POINT = the temperature where dew forms.
Conceptual Metaphor
THRESHOLD / TRIGGER POINT (The point at which a change of state is triggered, like a boiling point).
Practice
Quiz
What does a high dew point indicate?