weather_forecast {openmeteo}

Retrieve weather forecasts from the Open-Meteo API

Description

weather_forecast() calls the Open-Meteo Weather Forecast API to obtain meteorological forecasts for a given location.

Refer to the API documentation at: https://open-meteo.com/en/docs

Usage

weather_forecast(
  location,
  start = NULL,
  end = NULL,
  hourly = NULL,
  daily = NULL,
  response_units = NULL,
  model = NULL,
  timezone = "auto"
)

Arguments

location

Required. The location for which data will be retrieved. Supplied as either a c(latitude,longitude) WGS84 coordinate pair or a place name string (with co-ordinates obtained via geocode()).

start, end

Start and end dates in ISO 8601 (e.g. "2020-12-31"). If no dates are supplied, data for the next 7 days will be provided by default.

hourly, daily

At least one required. A weather variable accepted by the API, or list thereof. See details below.

response_units

Supply to convert temperature, windspeed, or precipitation units. This defaults to: ⁠list(temperature_unit = "celsius",⁠ ⁠windspeed_unit = "kmh", precipitation_unit = "mm")⁠

model

Supply to specify a model for forecasted values (defaults to autoselection of best model).

timezone

specify timezone for time data as a string, i.e. "australia/sydney" (defaults to "auto", the timezone local to the specified location).

Details

You will need to specify at least one weather variable, such as temperature, that you want forecasted data for. These variables are sampled or aggregated at hourly or daily intervals, and can be supplied as a list to request multiple variables over the same time period.

Example Hourly forecast variables include:

Variable	Description
temperature_2m	Air temperature at 2 meters above ground
precipitation	Sum of rain, showers, and snow over the preceding hour
windspeed_10m	Wind speed at 10 meters above ground
cloudcover	Total cloud cover as an area fraction
pressure_msl	Atmospheric air pressure at mean sea level

Example Daily forecast variables include:

Variable	Description
temperature_2m_max	Maximum daily air temperature at 2 meters above ground
precipitation_sum	Sum of rain, showers, and snow over the preceding day
windspeed_10m_max	Maximum daily wind speed at 10 meters above ground

Full documentation for the forecast API is available at: https://open-meteo.com/en/docs

You can also call weather_variables() to retrieve an (incomplete) shortlist of valid hourly and daily weather variables.

Value

Requested weather forecast data for the given location and time, as a tidy tibble.

Examples

# obtain temperature forecasts for the South Pole's next 7 days
weather_forecast(c(-90, 0), hourly = "temperature_2m")

# obtain temperature and precipitation forecasts for NYC in Imperial units
weather_forecast("nyc",
  hourly = c("temperature_2m", "precipitation"),
  response_units = list(
    temperature_unit = "fahrenheit",
    precipitation_unit = "inch"
  )
)

# will it rain tomorrow in Jakarta?
tomorrow <- Sys.Date() + 1
weather_forecast("jakarta", tomorrow, tomorrow, daily = "precipitation_sum")