Humidex
Canadian humidex (Masterton & Richardson 1979): comfort index from air temperature and dewpoint (C).
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Air temperature
- 30 C
- Dewpoint
- 20 C
Result: Humidex 37.6 — some discomfort (30-39).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- < 30
- Comfortable.
- 30-45
- Some to great discomfort.
- > 45
- Dangerous; >= 54 heat stroke imminent. A comfort index, not a diagnosis.
What you enter
- Air temperature
- Dewpoint
How this is calculated
Masterton JM, Richardson FA. Humidex: a method of quantifying human discomfort due to excessive heat and humidity. Environment Canada; 1979. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.