Everything behind the number
WetBulbTracker is built to be inspected. Dig into our live accuracy and open methodology, run the calculator, read the guides, or check live heat for major U.S. cities.
Open the live mapMethodology
Every formula, constant, and assumption behind the number. Open for scrutiny.
Live Accuracy
See how our WBGT stacks up against the U.S. National Weather Service: live, in public.
Cities
Live heat stress for dozens of major U.S. cities, at a glance.
Paw Safety
How hot the pavement really is under bare paws: asphalt runs far hotter than the air.
Outdoor Work
Work/rest guidance from the live reading: for crews, supervisors and safety officers.
Athletics
Practice and competition guidance, alongside your state's own high-school WBGT policy.
State Heat Policies
What each state’s school sports association says about heat, in plain words, with a link to its own document where we could confirm one.
Tactical
Flag conditions and work/rest cycles for military and first-responder training.
Custom Reports
Build a heat report for any place: share it or export a PNG or PDF. Today free, any date range with Plus.
Calculator
Enter temperature and humidity to compute WBGT, wet bulb, heat index, dew point and more.
Learn
Plain-language guides to heat stress, WBGT, and what to do when it climbs.
Updates
Product news and release notes: what's new on WetBulbTracker.