1. What is the Houston Heat Index Calculator?

Definition: This calculator computes the heat index (apparent temperature) for Houston conditions based on air temperature and relative humidity.

Purpose: It helps residents and workers understand how hot it feels when humidity combines with high temperatures, which is particularly important in Houston's humid climate.

2. How Does the Calculator Work?

The calculator uses the Rothfusz regression formula:

Where:

• \( HI \) — Heat index (°F)
• \( T \) — Air temperature (°F)
• \( R \) — Relative humidity (%)
• \( c_1 \) to \( c_9 \) — Empirical coefficients

Explanation: The formula accounts for how humidity affects the body's ability to cool itself through sweat evaporation.

3. Importance of Heat Index in Houston

Details: Houston's high humidity makes heat index values significantly higher than actual temperatures, increasing heat-related illness risks. The calculator helps:

• Plan outdoor activities safely
• Implement heat safety measures
• Understand weather conditions more accurately

4. Using the Calculator

Tips: Enter the current temperature (°F) and relative humidity (%). The calculator only works for temperatures ≥ 80°F.

5. Frequently Asked Questions (FAQ)

Q1: Why is Houston's heat index often higher than other cities?
A: Houston's coastal location brings high humidity levels, which dramatically increases how hot the temperature feels.

Q2: What's considered a dangerous heat index in Houston?
A: Heat indices above 103°F are dangerous, and above 125°F are extremely hazardous.

Q3: How does this differ from regular temperature?
A: The heat index accounts for how humidity affects human comfort, while temperature alone doesn't reflect how hot it feels.

Q4: Why doesn't the calculator work below 80°F?
A: Below 80°F, humidity has minimal impact on perceived temperature.

Q5: How often should I check the heat index in Houston?
A: During summer months, check multiple times daily as conditions change rapidly.