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Calculate dew point from temperature and humidity. See comfort levels instantly.
The dew point is the temperature at which air becomes saturated with moisture and water vapor begins to condense into liquid dew, calculated from air temperature and relative humidity.
| Dew Point | Comfort Level |
|---|---|
| Below 10°C / 50°F | Dry — very comfortable |
| 10–15°C / 50–59°F | Comfortable |
| 16–18°C / 60–65°F | Slightly humid |
| 19–21°C / 66–70°F | Humid — sticky feeling |
| 22–24°C / 72–75°F | Very humid — uncomfortable |
| Above 24°C / 75°F | Oppressive — dangerous heat stress risk |
Formula
Td = (b × α) / (a − α), where α = (a × T) / (b + T) + ln(RH / 100)Td = Dew point temperature in °C
T = Air temperature in °C
RH = Relative humidity (%)
a = Constant 17.27
b = Constant 237.7°C
Worked Example
Dew point at 25°C and 60% humidity
Did you know? The highest dew point ever recorded was 35°C (95°F) in Dhahran, Saudi Arabia on July 8, 2003 — making the heat index feel like 80°C (176°F) (source: NOAA).
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