Weather converter
Humidity to Dew Point Converter
Dew point
55°F (13°C)
Absolute humidity
10.8 g/m³
Feel
Pleasant
How the humidity to dew point converter works
Relative humidity only makes sense together with temperature - the same 60% RH feels tropical at 90°F and crisp at 50°F. Enter both and this tool computes the dew point (the honest mugginess number) and the actual water content of the air.
Magnus formula: Td = 243.04·γ / (17.625 − γ) γ = ln(RH/100) + 17.625·T/(243.04+T)Quick tips
- Use the 60/70 rule: dew point under 60°F feels fine, over 70°F feels oppressive.
- Indoors, aim for 30-50% RH - drier causes static and dry skin, damper feeds mold.
- Ignore afternoon RH drops: the moisture didn't leave; warmer air just holds more. Watch dew point instead.
Dew point comfort scale
| Dew point | How it feels |
|---|---|
| Below 50°F (10°C) | Dry and comfortable |
| 50-60°F (10-16°C) | Pleasant |
| 60-65°F (16-18°C) | Slightly sticky |
| 65-70°F (18-21°C) | Muggy |
| 70-75°F (21-24°C) | Oppressive |
| Above 75°F (24°C) | Miserable |
Frequently asked questions
What dew point corresponds to 50% humidity?
It depends entirely on temperature: 50% RH at 86°F (30°C) gives a muggy dew point of about 64°F (18°C), while 50% RH at 50°F (10°C) gives a bone-dry 32°F (0°C). That is exactly why meteorologists prefer dew point.
Can relative humidity exceed 100%?
Briefly and slightly, as supersaturation in clean air - but at ground level 100% means saturation: fog, dew, or rain.
What indoor humidity is ideal?
30-50% RH. Below 30% causes dry skin and static; above 60% encourages dust mites and mold.