record WeatherObservation(
DateTime RecordedAt,
decimal TemperatureInCelsius,
decimal PressureInMillibars) {
public override string ToString() =>
$"At {RecordedAt:h:mm tt} on {RecordedAt:M/d/yyyy}: " +
$"Temp = {TemperatureInCelsius}, with {PressureInMillibars} pressure";
}