Jetpack Holiday Snow only when it is really snowing. Snow outside your window, snow on your blog.

is-it-snowing

function cc_is_it_snowing() {

	// Zip Code / City Name
 	$location = 'North Pole';
 	$weather_data_api_url = 'http://api.openweathermap.org/data/2.5/weather?q=' . $location;

	$weather_data_response = wp_remote_get( $weather_data_api_url );

	if ( is_wp_error( $weather_data_response ) ) {
		// Errors are no joy. No joy, no snow.
		return false;
	} else {
	   	$weather_data = json_decode( $weather_data_response['body'], true );
	   	if ( 'Snow' == $weather_data['weather'][0]['main'] ) {
	   		// Let it snow.
			return true;
		} else {
			// Elsa doesn't want to build a snowman
			return false;
		}

	}

}
add_filter( 'jetpack_holiday_chance_of_snow', 'cc_is_it_snowing' );