boonah                  SILO weather data extracted for Boonah SE
                        Queensland
crop                    Crop data containing hypothetical sowing
                        flowering and harvest dates
cumulative              Sum of a weather variable between between two
                        dates
daily_mean              Mean of daily weather variable values between
                        two dates
date_from_day_year      Calculate a date from the day of the year and
                        the year
day_of_harvest          The day of harvest in the year of sowing
day_of_year             Calculate day of year from a date
get_multi_silodata      Retrieve SILO data for multiple sites from Qld
                        DES longpaddock website
get_silodata            Retrieve weather data from Queensland
                        Government DES longpaddock website
growing_degree_days     Degree days as the sum of capped average daily
                        temperature above a baseline value
number_of_days          The number of days between two dates
stress_days_over        The number of days that maximum temp is over a
                        baseline value
two_sites               SILO weather data extracted for two arbitrary
                        sites
weather_extract         Extract one or more columns of weather data
                        between two dates
