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Weather

Browse all 17 weather tools

What is weather calculators?

Weather calculators use astronomical formulas and meteorological data to compute sunrise and sunset times, moon phases, temperature conversions, and other environmental metrics for any date and location on Earth.

Air Quality Index Calculator

Calculate AQI from pollutant concentrations with EPA breakpoints and health guidance.

air quality indexAQI calculatorPM2.5
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Barometric Pressure Converter

Convert between pressure units with altitude correction and weather condition guide.

barometric pressure converterinHg to hPapressure units
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Clothing Weather Guide

Get clothing recommendations based on temperature, wind, rain, and activity level.

clothing weather guidewhat to wearweather clothing
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Dew Point Calculator

Calculate dew point from temperature and humidity. See comfort levels instantly.

dew point calculatorhumiditydew point temperature
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Feels Like Temperature

Calculate feels-like temperature combining Wind Chill and Heat Index formulas.

feels like temperatureapparent temperaturewind chill
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Frost Date Calculator

Estimate frost dates by USDA zone with growing season and planting window calculations.

frost date calculatorlast frost datefirst frost
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Growing Season Calculator

Calculate growing season length and planting windows from USDA frost zone data.

growing seasonfrost datesplanting calendar
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Heat Index Calculator

Calculate feels-like temperature in heat with NWS danger levels and safety tips.

heat index calculatorfeels like temperatureapparent temperature
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Humidity Converter

Convert between relative, absolute, mixing ratio, and specific humidity values.

humidity converterrelative humidityabsolute humidity
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Lightning Distance Calculator

Calculate lightning distance from the flash-to-thunder delay using speed of sound.

lightning distancethunder distanceflash to thunder
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Outdoor Event Weather Planner

Score weather suitability for outdoor events with tips and risk alerts.

outdoor event weatherevent weather planneroutdoor event planning
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Pollen Season Predictor

Predict pollen peaks by region and allergen type with seasonal calendar and tips.

pollen seasonpollen forecastallergy season
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Rainfall Volume Calculator

Calculate water volume collected from rainfall for rain barrels and irrigation planning.

rainfall volume calculatorrain barrel calculatorrainwater harvesting
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Snow Day Predictor

Predict snow day likelihood based on snowfall, temperature, wind, and region type.

snow day predictorsnow day calculatorschool closing
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UV Index Calculator

Estimate safe sun exposure time with SPF recommendations by skin type and UV level.

UV index calculatorsun exposure timeSPF recommendation
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Wind Chill Calculator

Calculate feels-like temperature from air temp and wind speed with frostbite risk levels.

wind chill calculatorfeels like temperaturefrostbite risk
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Wind Chill vs Heat Index Comparison

Compare wind chill and heat index side by side with reference charts and risk levels.

wind chill vs heat indexfeels like comparisonwind chill calculator
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Formula & Methodology

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Did you know? The world's highest recorded temperature is 56.7°C (134.1°F), measured at Furnace Creek, Death Valley, California on July 10, 1913. The lowest naturally occurring temperature on Earth's surface was −89.2°C (−128.6°F), recorded at the Soviet Vostok Station in Antarctica on July 21, 1983.

Sources

  • National Weather Service (NWS) / NOAA — Weather observation standards and climate records
  • World Meteorological Organization (WMO) — Global weather and climate data standards

Frequently Asked Questions