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Weather References

Find all your weather reference charts and tables at Almanac.com: how to measure tornadoes, hurricane strength, windchill, wind speed, UV radiation risk, earthquakes, heat, and more. Plus, enjoy our free weather lore calendar.

UV Index Scale: The Strength of the Sun—Say "No" to Sunburns!

Sun Safety: How Long Does it Take to Burn?

temperature conversion calculator, blue sky with clouds with a thermometer in view. Celsius and Fahrenheit

Temperature Conversion Formula and Calculator: Celsius to Fahrenheit

Find the Temperature Conversion Formula, Chart, and Calculator!

Windchill Chart for the United States

Know When Frostbite and Hypothermia Might Occur

Ice thickness chart title

Ice Thickness Safety Chart

Know When It's Safe to be on the Ice

Basic Meteorological Terms, Concepts, and Phenomena

Common Climate and Weather Terms

Hail Damage: Measuring Hailstorm Intensity

How to Measure Hail Intensity

How to Measure Tornadoes: The EF Scale

The EF Scale

Relative Humidity

Windchill Chart for Canada

Coconut palms tree during heavy wind or hurricane. Rainy day

How to Measure Wind Speed: The Beaufort Wind Force Scale

Estimate the Wind Speed with Your Eyes

Frost Dates Chart for United States

When are the first and last frost dates of the year?

Frost Dates Chart for Canada

When are the first and last frost dates of the year?