Real Feel Calculator Cold
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Reviewed by Calculator Editorial Team
When the temperature drops, the real feel temperature can be much lower than the actual air temperature due to wind chill. This calculator helps you determine how cold it actually feels based on the air temperature and wind speed.
What is real feel temperature?
The real feel temperature, often called wind chill, is a measure of how cold the air feels to the human body when factoring in wind speed and humidity. It's different from the actual air temperature because wind removes heat from the body, making it feel colder than it actually is.
Meteorologists use the real feel temperature to provide more accurate weather forecasts, especially during cold weather conditions. It helps people understand how to dress appropriately and take necessary precautions when temperatures drop.
Key Difference
Real feel temperature is not the same as humidity. While humidity affects how much moisture is in the air, wind chill specifically measures how wind affects perceived temperature.
How to calculate real feel temperature
The most commonly used formula for calculating wind chill is the North American and UK wind chill index, developed by the National Weather Service and the Met Office. The formula is:
Wind Chill Formula
Wind Chill (°F) = 35.74 + 0.6215 × T - 35.75 × V0.16 + 0.4275 × T × V0.16
Where:
- T = air temperature in °F
- V = wind speed in mph
For metric units, the formula is:
Metric Wind Chill Formula
Wind Chill (°C) = 13.12 + 0.6215 × T - 11.37 × V0.16 + 0.3965 × T × V0.16
Where:
- T = air temperature in °C
- V = wind speed in km/h
The formula accounts for the cooling effect of wind on exposed skin. The higher the wind speed, the more significant the wind chill effect becomes.
Factors affecting real feel temperature
Several factors influence how cold the air feels to the human body:
- Wind speed: Higher wind speeds increase heat loss from the body, making it feel colder.
- Air temperature: Colder air temperatures naturally feel colder to the body.
- Humidity: While not directly part of the wind chill calculation, high humidity can make cold temperatures feel even colder.
- Clothing: The type and amount of clothing you wear can significantly affect how cold you feel.
- Exposure time: How long you're exposed to cold temperatures can make the sensation more intense.
Understanding these factors helps in interpreting weather forecasts and preparing appropriately for cold weather conditions.
Example calculation
Let's calculate the real feel temperature for an air temperature of 20°F and a wind speed of 15 mph.
Example Calculation
Wind Chill (°F) = 35.74 + 0.6215 × 20 - 35.75 × 150.16 + 0.4275 × 20 × 150.16
Calculating each part:
- 0.6215 × 20 = 12.43
- 150.16 ≈ 2.80
- 35.75 × 2.80 ≈ 100.95
- 0.4275 × 20 × 2.80 ≈ 23.98
Putting it all together:
35.74 + 12.43 - 100.95 + 23.98 ≈ 10.10°F
In this example, the real feel temperature is approximately 10.1°F, which is much colder than the actual air temperature of 20°F due to the wind chill effect.
| Air Temperature (°F) | Wind Speed (mph) | Real Feel Temperature (°F) |
|---|---|---|
| 20 | 5 | 16.1 |
| 20 | 10 | 12.4 |
| 20 | 15 | 10.1 |
| 20 | 20 | 8.2 |
Frequently Asked Questions
What is the difference between real feel temperature and humidity?
Real feel temperature (wind chill) specifically measures how wind affects perceived temperature, while humidity measures the amount of moisture in the air. Both factors contribute to how cold you feel, but they're measured differently.
Why does wind make it feel colder?
Wind increases heat loss from the body by removing the warm air layer that forms around your skin. This makes cold temperatures feel even colder than they actually are.
How accurate is the wind chill formula?
The wind chill formula is a simplified model based on scientific research. It provides a reasonable estimate but may not account for all individual variations in how people experience cold temperatures.
Can I use this calculator for metric units?
Yes, the calculator includes both imperial (Fahrenheit, mph) and metric (Celsius, km/h) options. Simply select your preferred units before calculating.
How often should I check the real feel temperature?
During cold weather, checking the real feel temperature at least once a day can help you prepare appropriately for outdoor activities and dress accordingly.