Core

Data Fields

The Tomorrow.io REST Weather API provides the following information:

Field	Values (Metric, Imperial)	Availability
temperature The "real" temperature measurement (at 2m)	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: +
temperatureApparent The 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".	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: +
dewPoint The temperature to which air must be cooled to become saturated with water vapor (at 2m)	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: +
humidity The concentration of water vapor present in the air	%	F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R A: WW S: ∧ ∨ ~ ⧖ P: +
windSpeed The fundamental atmospheric quantity caused by air moving from high to low pressure, usually due to changes in temperature (at 10m)	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: +
windDirection The direction from which it originates, measured in degrees clockwise from due north (at 10m)	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: +
windGust The maximum brief increase in the speed of the wind, usually less than 20 seconds (at 10m)	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: +
pressureSurfaceLevel The force exerted against a surface by the weight of the air above the surface (at the surface level)	hPa inHg	F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I R A: WW S: ∧ ∨ ~ ⧖ P: +
pressureSeaLevel The force exerted against a surface by the weight of the air above the surface (at the mean sea level)	hPa inHg	F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T M R A: WW S: ∧ ∨ ~ ⧖ P: +
precipitationIntensity The 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.	mm/hr in/hr	F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R (map from 6h back to 6h out) A: WW S: ∧ ∨ ~ ⧖ P: +
rainIntensity The 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.	mm/hr in/hr	F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I R (map from 6h back to 6h out) A: WW S: ∧ ∨ ~ ⧖ P: -
freezingRainIntensity The 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.	mm/hr in/hr	F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I R (map from 6h back to 6h out) A: WW S: ∧ ∨ ~ ⧖ P: -
snowIntensity The 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.	mm/hr in/hr	F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I R (map from 6h back to 6h out) A: WW S: ∧ ∨ ~ ⧖ P: -
sleetIntensity The 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.	mm/hr in/hr	F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I R (map from 6h back to 6h out) A: WW S: ∧ ∨ ~ ⧖ P: -
precipitationProbability Probability 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.	%	F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T R A: WW S: ∧ ∨ ~ ⧖ P: -
precipitationType The 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	0: N/A 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: -
rainAccumulation The accumulated amount of liquid rain that has or will accumulate for the past or future hour of the requested time	mm in	F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I A: WW S: ∧ ∨ ~ ⧖ P: +
snowAccumulation The 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.	mm in	F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I A: WW S: ∧ ∨ ~ ⧖ P: -
snowAccumulationLwe The 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.	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: +
snowDepth The depth of snow on the ground including both new and old snow	cm in	F: [-6 hours for free, up to -7 days for paying accounts, +48 hours] I: T I M A: US S: ∧ ∨ ~ ⧖ P: -
sleetAccumulation The accumulated amount of sleet (ice pellets) that has or will accumulate for the past or future hour of the requested time	mm in	F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I A: WW S: ∧ ∨ ~ ⧖ P: -
sleetAccumulationLwe The 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: -
iceAccumulation The accumulated amount of ice from freezing rain that has or will accumulate for the past or future hour of the requested time	mm in	F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I A: WW S: ∧ ∨ ~ ⧖ P: -
iceAccumulationLwe The 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: -
sunriseTime The daily appearance of the Sun on the horizon due to Earth's rotation	UTC ISO-8601	F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I A: WW S: P: -
sunsetTime The daily disappearance of the Sun below the horizon due to Earth's rotation	UTC ISO-8601	F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I A: WW S: P: -
visibility The measure of the distance at which an object or light can be clearly discerned	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: +
cloudCover The fraction of the sky obscured by clouds when observed from a particular location	%	F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I M R A: WW S: ∧ ∨ ~ ⧖ P: +
cloudBase The lowest altitude of the visible portion of a cloud (above ground level)	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: +
cloudCeiling The highest altitude of the visible portion of a cloud (above ground level)	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: +
moonPhase The shape of the directly sunlit portion of the Moon as viewed from Earth	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: -
uvIndex Standard measurement of the strength of sunburn producing UV radiation at a particular place and time.	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.	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: -
gdd10To30 Growing 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.	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: -
gdd10To31 Growing 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: -
gdd08To30 Growing 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: -
gdd03To25 Growing 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: -
evapotranspiration Penman–Monteith FAO56 The combined processes by which water moves from the earth’s surface into the atmosphere.	mm in	F: [-6 hours for free, up to -7 days for paying accounts, +15 days] I: T I A: WW S: ∧ ∨ ~ ⧖ P: +
weatherCodeFullDay The 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: -
weatherCodeDay The 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: -
weatherCodeNight The 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: -
weatherCode The 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: -
wetBulbGlobeTemperature Wet Bulb Globe Temperature (WBGT) is a measure of heat stress in direct sunlight. It takes into account temperature, humidity, wind speed, sun angle and solar radiation. WBGT values are NOT directly comparable to temperature or heat index values with values of 90 or higher being dangerous for any strenuous activity.	Celsius [-90,60] Fahrenheit [-130,140]	F: [-7 days , +15 days] I: T I M R A: WW S: ∧ ∨ ~ P: -