Data Fields
The Tomorrow.io REST Weather API provides the following information
Field | (Metric, Imperial) | |
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The "real" temperature measurement (at 2m) | Celsius [-90,60] | F: [-6 hours for free, up to -7 days for paying accounts, +14 days]
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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] | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
The temperature to which air must be cooled to become saturated with water vapor (at 2m) | Celsius [0,100] | F: [-6 hours for free, up to -7 days for paying accounts, +14 days]
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The concentration of water vapor present in the air | % | F: [-6 hours for free, up to -7 days for paying accounts, +14 days]
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The fundamental atmospheric quantity caused by air moving from high to low pressure, usually due to changes in temperature (at 10m) | m/s | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] I: T I M R
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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, +14 days]
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The maximum brief increase in the speed of the wind, usually less than 20 seconds (at 10m) | m/s | F: [-6 hours for free, up to -7 days for paying accounts, +14 days]
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The force exerted against a surface by the weight of the air above the surface (at the surface level) | hPa | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
The force exerted against a surface by the weight of the air above the surface (at the mean sea level) | hPa | F: [-6 hours for free, up to -7 days for paying accounts, +14 days]
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The rate is expressed in terms of length (depth) per unit time, in millimeters per hour, or inches per hour. | mm/hr | F: [-6 hours for free, up to -7 days for paying accounts, +14 days]
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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 | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
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 | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
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 | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
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 | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
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, +14 days] |
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 | 1: Rain | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
The accumulated amount of liquid rain that has or will accumulate for the past or future hour of the requested time | mm | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
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 | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
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 | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
The depth of snow on the ground including both new and old snow | cm | F: [-6 hours for free, up to -7 days for paying accounts, +48 hours] |
The accumulated amount of sleet (ice pellets) that has or will accumulate for the past or future hour of the requested time | mm | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
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 | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
The accumulated amount of ice from freezing rain that has or will accumulate for the past or future hour of the requested time | mm | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
The liquid water equivalent | mm of LWE | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
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, +14 days] |
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, +14 days] |
The measure of the distance at which an object or light can be clearly discerned | km | F: [-6 hours for free, up to -7 days for paying accounts, +14 days]
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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, +14 days]
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The lowest altitude of the visible portion of a cloud (above ground level) | km or null | F: [-6 hours for free, up to -7 days for paying accounts, +14 days]
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The highest altitude of the visible portion of a cloud (above ground level) | km or null | F: [-6 hours for free, up to -7 days for paying accounts, +14 days]
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The shape of the directly sunlit portion of the Moon as viewed from Earth | 0: New (0.0625-0.9375) | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
Standard measurement of the strength of sunburn producing UV radiation at a particular place and time. | 0-2: Low | F: [-6 hours for free, up to -7 days for paying accounts, +108 hours] |
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 | F: [-6 hours for free, up to -7 days for paying accounts, +108 hours] |
Growing Degree Days calculation with a temperature base of 10°C and a temperature cap of 30°C. | The number of growing degree days | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
Growing Degree Days calculation with a temperature base of 10°C and a temperature cap of 31°C. | The number of growing degree days | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
Growing Degree Days calculation with a temperature base of 08°C and a temperature cap of 30°C. | The number of growing degree days | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
Growing Degree Days calculation with a temperature base of 03°C and a temperature cap of 25°C. | The number of growing degree days | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
The combined processes by which water moves from the earth’s surface into the atmosphere. | mm | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] |
The text description that conveys the most prominent weather condition during the day(from sunrise till next sunrise) | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] | |
The text description that conveys the most prominent weather condition during the day(from sunrise till sunset) | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] | |
The text description that conveys the most prominent weather condition during the night (from sunset till sunrise) | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] | |
The text description that conveys the most prominent weather condition | F: [-6 hours for free, up to -7 days for paying accounts, +14 days] | |
The probability that lightning flash density exceeds 0.1 with units of (100 km^2 / hour). | % | F: [+14 days] |
Heat stress index based on Ezra-Zohar formula. | 0-22: No Heat Stress | F: [-7d, +14 days] |
