Data Fields
The Tomorrow.io REST Weather API provides the following information
| Field | Values (Metric, Imperial) | Availability |
|---|---|---|
temperatureThe "real" temperature measurement (at 2m) Learn more | Celsius [-90,60] Fahrenheit [-130,140] | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R A: WW S: ∧ ∨ ~ ⧖ P: +    |
temperatureApparentThe temperature equivalent perceived by humans, caused by the combined effects of air temperature, relative humidity, and wind speed (at 2m) Also known as "feels like". Learn more | Celsius [-90,60] Fahrenheit [-130,140] | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R A: WW S: ∧ ∨ ~ ⧖ P: - |
dewPointThe temperature to which air must be cooled to become saturated with water vapor (at 2m) Learn more | Celsius [0,100] Fahrenheit [32,212] | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R A: WW S: ∧ ∨ ~ ⧖ P: +    |
humidityThe concentration of water vapor present in the air Learn more | % | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R A: WW S: ∧ ∨ ~ ⧖ P: +   |
windSpeedThe fundamental atmospheric quantity caused by air moving from high to low pressure, usually due to changes in temperature (at 10m) Learn more | m/s mph | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R A: WW S: ∧ ∨ ~ ⧖ P: +    |
windDirectionThe direction from which it originates, measured in degrees clockwise from due north (at 10m) Learn more | degrees or null | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R A: WW S: P: +   |
windGustThe maximum brief increase in the speed of the wind, usually less than 20 seconds (at 10m) Learn more | m/s mph | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R A: WW S: ∧ ∨ ~ ⧖ P: +    |
pressureSurfaceLevelThe force exerted against a surface by the weight of the air above the surface (at the surface level) Learn more | hPa inHg | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I R A: WW S: ∧ ∨ ~ ⧖ P: + |
pressureSeaLevelThe force exerted against a surface by the weight of the air above the surface (at the mean sea level) Learn more | hPa inHg | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T M R A: WW S: ∧ ∨ ~ ⧖ P: +    |
precipitationIntensityThe instantaneous precipitation rate at ground level The measure of the intensity of precipitation by calculating the amount of precipitation that would fall over a given interval of time if the precipitation intensity were constant over that time period. The rate is expressed in terms of length (depth) per unit time, in millimeters per hour, or inches per hour. Learn more | mm/hr in/hr | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R A: WW S: ∧ ∨ ~ ⧖ P: +    |
rainIntensityThe measure of the intensity of rainfall by calculating the amount of rain that would fall over a given interval of time if the rain intensity were constant over that time period. The rate is expressed in terms of length (depth) per unit time, in millimeters per hour, or inches per hour. Learn more | mm/hr in/hr | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R A: WW S: ∧ ∨ ~ ⧖ P: - |
freezingRainIntensityThe measure of the intensity of freezing rain by calculating the amount of freezing rain that would fall over a given interval of time if the freezing rain intensity were constant over that time period. The rate is expressed in terms of length (depth) per unit time, in millimeters per hour, or inches per hour. Learn more | mm/hr in/hr | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R A: WW S: ∧ ∨ ~ ⧖ P: - |
snowIntensityThe measure of the intensity of snowfall by calculating the amount of snow that would fall over a given interval of time if the snow intensity were constant over that time period. The rate is expressed in terms of length (depth) per unit time, in millimeters per hour, or inches per hour. Learn more | mm/hr in/hr | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R A: WW S: ∧ ∨ ~ ⧖ P: - |
sleetIntensityThe measure of the intensity of sleet (ice pellets) by calculating the amount of sleet that would fall over a given interval of time if the sleet intensity were constant over that time period. The rate is expressed in terms of length (depth) per unit time, in millimeters per hour, or inches per hour. Learn more | mm/hr in/hr | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R A: WW S: ∧ ∨ ~ ⧖ P: - |
precipitationProbabilityProbability of precipitation represents the chance of >0.0254 cm (0.01 in.) of liquid equivalent precipitation at a radius surrounding a point location over a specific period of time. Learn more | % | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T R A: WW S: ∧ ∨ ~ ⧖ P: - |
precipitationTypeThe various types of precipitation often include the character or phase of the precipitation which is falling to ground level (Schuur classification) Precipitation Type indicates what type the precipitation will be if something were to precipitate out. This will have a non-zero value regardless of the precipitation probability or intensity values Learn more | 1: Rain 2: Snow 3: Freezing Rain 4: Ice Pellets / Sleet | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I R A: WW S: ∧ ∨ ~ ⧖ P: - |
rainAccumulationThe accumulated amount of liquid rain that has or will accumulate for the past or future hour of the requested time Learn more | mm in | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I A: WW S: ∧ ∨ ~ ⧖ P: - |
snowAccumulationThe accumulated amount of new snowfall that has or will accumulate for the past or future hour of the requested time Will always return hourly data and does not aggregate - eg. if you request snowAccumulationMax over a daily timestep, the max hourly value of that day will be returned, not the accumulation for the whole day. Learn more | mm in | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I A: WW S: ∧ ∨ ~ ⧖ P: - |
snowAccumulationLweThe liquid water equivalent of accumulated amount of new snowfall that has or will accumulate for the past or future hour of the requested time Will always return hourly data and does not aggregate - eg. if you request snowAccumulationMax over a daily timestep, the max hourly value of that day will be returned, not the accumulation for the whole day. Learn more | mm of LWE in of LWE | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I A: WW S: ∧ ∨ ~ P: - |
snowDepthThe depth of snow on the ground including both new and old snow Learn more | cm in | F: [-6 hours for free, up to -7 days for paying accounts, +48 hours] I: T I M A: US S: ∧ ∨ ~ ⧖ P: - |
sleetAccumulationThe accumulated amount of sleet (ice pellets) that has or will accumulate for the past or future hour of the requested time Learn more | mm in | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I A: WW S: ∧ ∨ ~ ⧖ P: - |
sleetAccumulationLweThe liquid water equivalent accumulated amount of sleet (ice pellets) that has or will accumulate for the past or future hour of the requested time | mm of LWE in of LWE | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I A: WW S: ∧ ∨ ~ P: - |
iceAccumulationThe accumulated amount of ice from freezing rain that has or will accumulate for the past or future hour of the requested time Learn more | mm in | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I A: WW S: ∧ ∨ ~ ⧖ P: - |
iceAccumulationLweThe liquid water equivalent accumulated amount of ice from freezing rain that has or will accumulate for the past or future hour of the requested time | mm of LWE in of LWE | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I A: WW S: ∧ ∨ ~ P: - |
sunriseTimeThe daily appearance of the Sun on the horizon due to Earth's rotation Learn more | UTC ISO-8601 | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I A: WW S: P: - |
sunsetTimeThe daily disappearance of the Sun below the horizon due to Earth's rotation Learn more | UTC ISO-8601 | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I A: WW S: P: - |
visibilityThe measure of the distance at which an object or light can be clearly discerned Learn more | km mi | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R A: WW S: ∧ ∨ ~ ⧖ P: +    |
cloudCoverThe fraction of the sky obscured by clouds when observed from a particular location Learn more | % | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R A: WW S: ∧ ∨ ~ ⧖ P: +   |
cloudBaseThe lowest altitude of the visible portion of a cloud (above ground level) Learn more | km or null mi or null | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R A: WW S: ∧ ∨ ~ ⧖ P: +    |
cloudCeilingThe highest altitude of the visible portion of a cloud (above ground level) Learn more | km or null mi or null | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R A: WW S: ∧ ∨ ~ ⧖ P: +    |
moonPhaseThe shape of the directly sunlit portion of the Moon as viewed from Earth Learn more | 0: New (0.0625-0.9375) 1: Waxing Crescent (0.0625-0.1875) 2: First Quarter (0.1875-0.3125) 3: Waxing Gibbous (0.3125-0.4375) 4: Full (0.4375-0.5625) 5: Waning Gibbous (0.5625-0.6875) 6: Third Quarter (0.6875-0.8125) 7: Waning Crescent (0.8125-0.9375) | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T A: WW S: P: - |
uvIndexStandard measurement of the strength of sunburn producing UV radiation at a particular place and time. Learn more | 0-2: Low 3-5: Moderate 6-7: High 8-10: Very High 11+: Extreme | F: [-6 hours for free, up to -7 days for paying accounts, +108 hours] D: T A: WW S: ∧ ∨ ~ ⧖ P: - |
uvHealthConcern When the predicted UV index is within these numerical ranges, the recommended need for protection is indicated by the qualitative description of the values. Learn more | 0-2: Low 3-5: Moderate 6-7: High 8-10: Very High 11+: Extreme | F: [-6 hours for free, up to -7 days for paying accounts, +108 hours] D: T A: WW S: ∧ ∨ ~ ⧖ P: - |
gdd10To30Growing Degree Days calculation with a temperature base of 10°C and a temperature cap of 30°C. Typically used to determine Maize and Soybean phonological stage. Learn more | The number of growing degree days | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T R A: WW P: - |
gdd10To31Growing Degree Days calculation with a temperature base of 10°C and a temperature cap of 31°C. Typically used to determine Sunflower phonological stage. | The number of growing degree days | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T R A: WW P: - |
gdd08To30Growing Degree Days calculation with a temperature base of 08°C and a temperature cap of 30°C. Typically used to determine Green Gram and Sorghum phonological stage. | The number of growing degree days | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T R A: WW P: - |
gdd03To25Growing Degree Days calculation with a temperature base of 03°C and a temperature cap of 25°C. Typically used to determine Potatoes phonological stage. | The number of growing degree days | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T R A: WW P: - |
evapotranspirationPenman–Monteith FAO56 The combined processes by which water moves from the earth’s surface into the atmosphere. Learn more | mm in | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I A: WW S: ∧ ∨ ~ ⧖ P: - |
weatherCodeFullDayThe text description that conveys the most prominent weather condition during the day (from sunrise till next sunrise) | Weather Codes values | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T R A: WW S: ∧ ∨ ⧖ P: - |
weatherCodeDayThe text description that conveys the most prominent weather condition during the day (from sunrise till sunset) | Weather Codes values | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T R A: WW S: ∧ ∨ ⧖ P: - |
weatherCodeNightThe text description that conveys the most prominent weather condition during the night (from sunset till sunrise) | Weather Codes values | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T R A: WW S: ∧ ∨ ⧖ P: - |
weatherCodeThe text description that conveys the most prominent weather condition | Weather Codes values | F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T R A: WW S: ∧ ∨ ⧖ P: - |
thunderstormProbabilityThe probability that lightning flash density exceeds 0.1 with units of (100 km^2 / hour). | % | F: [+14 days] I: T I M A: WW S: ∧ ∨ ~ P: -  |
ezHeatStressIndexHeat stress index based on Ezra-Zohar formula. | 0-22: No Heat Stress 22-24: Mild Heat Stress 24-26: Moderate Heat Stress 26-28: Medium Heat Stress 28-30: Severe Heat Stress 30+: Extreme Heat Stress | F: [-7d, +15 days] I: T I M R A: WW S: ∧ ∨ ~ ⧖ P: -  |