This function takes information of where and when a set of environmental samples were
collected and retrieves temperature data (measured in accumulated degree-days) for those locations and times. Data come from
the Open-Meteo Historical Weather API (https://open-meteo.com/en/docs/historical-weather-api)
via the `openmeteo`

R package. The optional `intervals`

argument
specifies a set of intervals over which the function will calculate the accumulated temperature in the form of Accumulated Thermal Units (ATUs) for each interval.

## Arguments

- lon
A numeric vector giving the longitude of the sampling sites in Decimal Degrees.

- lat
A numeric vector giving the latitude of the sampling sites in Decimal Degrees.

- dates
A character or date vector of dates giving the date when each sample was collected (format is YYYY-MM-DD)

- intervals
An integer vector giving a set of time intervals over to calculate accumulated degree-days. Default is NULL where the interval is 0 (returns the daily temperature in degrees Celsius at time t). If

`intervals`

=3 then the accumulated degree-days for the preceding 3 days is returned.