Core

Data Fields

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

FieldValues (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: ∧ ∨ ~ ⧖

temperaturetemperature

temperature-sitemperature-si
temperature-ustemperature-us
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: ∧ ∨ ~ ⧖
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: ∧ ∨ ~ ⧖

dewpointdewpoint

dewpoint-sidewpoint-si
dewpoint-usdewpoint-us
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: ∧ ∨ ~ ⧖

humidityhumidity

humidityhumidity
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: ∧ ∨ ~ ⧖

wind-speedwind-speed

wind-speed-siwind-speed-si
wind-speed-uswind-speed-us
windDirection

The direction from which it originates, measured in degrees clockwise from due north (at 10m)
degrees or nullF: [-6 hours for free, up to -7 days for paying accounts, +15 days]
I: T I M R
A: WW
S:

wind-directionwind-direction

wind-directionwind-direction
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: ∧ ∨ ~ ⧖

wind-gustwind-gust

wind-gust-siwind-gust-si
wind-gust-uswind-gust-us
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: ∧ ∨ ~ ⧖
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: ∧ ∨ ~ ⧖

pressurepressure

pressure-sipressure-si
pressure-uspressure-us
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: ∧ ∨ ~ ⧖

precip-siprecip-si

precip-siprecip-si
precip-usprecip-us
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: ∧ ∨ ~ ⧖
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: ∧ ∨ ~ ⧖
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: ∧ ∨ ~ ⧖
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: ∧ ∨ ~ ⧖
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: ∧ ∨ ~ ⧖
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: ∧ ∨ ~ ⧖
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: ∧ ∨ ~ ⧖
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: ∧ ∨ ~ ⧖
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: ∧ ∨ ~
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: ∧ ∨ ~ ⧖
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: ∧ ∨ ~
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: ∧ ∨ ~ ⧖
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: ∧ ∨ ~
sunriseTime

The daily appearance of the Sun on the horizon due to Earth's rotation
UTC ISO-8601F: [-6 hours for free, up to -7 days for paying accounts, +15 days]
I: T I
A: WW
S:
sunsetTime

The daily disappearance of the Sun below the horizon due to Earth's rotation
UTC ISO-8601F: [-6 hours for free, up to -7 days for paying accounts, +15 days]
I: T I
A: WW
S:
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: ∧ ∨ ~ ⧖

visibilityvisibility

visibility-sivisibility-si
visibility-usvisibility-us
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: ∧ ∨ ~ ⧖

cloud-covercloud-cover

cloud-covercloud-cover
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: ∧ ∨ ~ ⧖

cloud-basecloud-base

cloud-base-sicloud-base-si
cloud-base-uscloud-base-us
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: ∧ ∨ ~ ⧖

cloud-ceilingcloud-ceiling

cloud-ceiling-sicloud-ceiling-si
cloud-ceiling-uscloud-ceiling-us
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:
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: ∧ ∨ ~ ⧖
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: ∧ ∨ ~ ⧖
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 daysF: [-6 hours for free, up to -7 days for paying accounts, +15 days]
I: T R
A: WW
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 daysF: [-6 hours for free, up to -7 days for paying accounts, +15 days]
I: T R
A: WW
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 daysF: [-6 hours for free, up to -7 days for paying accounts, +15 days]
I: T R
A: WW
S:
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 daysF: [-6 hours for free, up to -7 days for paying accounts, +15 days]
I: T R
A: WW
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: ∧ ∨ ~ ⧖
weatherCodeFullDay

The text description that conveys the most prominent weather condition during the day (from sunrise till next sunrise)
Weather Codes valuesF: [-6 hours for free, up to -7 days for paying accounts, +15 days]
I: T R
A: WW
S: ∧ ∨ ⧖
weatherCodeDay

The text description that conveys the most prominent weather condition during the day (from sunrise till sunset)
Weather Codes valuesF: [-6 hours for free, up to -7 days for paying accounts, +15 days]
I: T R
A: WW
S: ∧ ∨ ⧖
weatherCodeNight

The text description that conveys the most prominent weather condition during the night (from sunset till sunrise)
Weather Codes valuesF: [-6 hours for free, up to -7 days for paying accounts, +15 days]
I: T R
A: WW
S: ∧ ∨ ⧖
weatherCode

The text description that conveys the most prominent weather condition
Weather Codes valuesF: [-6 hours for free, up to -7 days for paying accounts, +15 days]
I: T R
A: WW
S: ∧ ∨ ⧖