1. What is a Temp and Dew Point Calculator?

Definition: This calculator estimates the relative humidity based on the current temperature and dew point temperature.

Purpose: It helps meteorologists, HVAC professionals, and weather enthusiasts determine atmospheric moisture levels.

2. How Does the Calculator Work?

The calculator uses the Magnus formula:

Where:

• \( RH \) — Relative Humidity (%)
• \( T \) — Temperature (°C)
• \( T_d \) — Dew Point Temperature (°C)

Explanation: The formula calculates the ratio of actual water vapor pressure to saturation vapor pressure at the current temperature.

3. Importance of Relative Humidity Calculation

Details: Understanding RH helps predict precipitation, assess comfort levels, and maintain proper conditions in buildings and industrial processes.

4. Using the Calculator

Tips: Enter both temperature and dew point in Celsius. Dew point cannot exceed temperature. Results show as percentage (0-100%).

5. Frequently Asked Questions (FAQ)

Q1: Why does dew point need to be ≤ temperature?
A: Physically, dew point cannot exceed air temperature as it represents the temperature at which air becomes saturated.

Q2: What's a comfortable RH range?
A: Typically 30-60% for human comfort, with lower values in winter (30-40%) and higher in summer (40-60%).

Q3: How accurate is this formula?
A: The Magnus formula is accurate to within ±0.4% RH for temperatures between -20°C and +50°C.

Q4: Can I use Fahrenheit values?
A: No, this calculator requires Celsius inputs. Convert Fahrenheit to Celsius first (°C = (°F - 32) × 5/9).

Q5: What does 100% RH mean?
A: The air is fully saturated with water vapor, and condensation (dew, fog, or precipitation) will occur.