- Departure from Average: the number of visits expected expressed as a percent departure from average
- Average number of Visits: the average number of visits expected (per capita) based on the model forecast, expressed as a percent
- Good: temperature conditions are mild and do not present a danger to those who are vulnerable to the heat
- Moderate: vulnerable groups should exercise caution while outside
- Unhealthy for Sensitive Groups: vulnerable groups should take precautions while outside
- Unhealthy: all individuals should take precautions while outside
- Very Unhealthy: Vulnerable groups should not be outside. Everyone else should take serious precautions while outside
- Hazardous: all individuals should not spend time outside