transients.php

<?php

function get_temperature() {
	// api call
}

function get_cached( $method, $args ) {
	$key = [ $method, $args ];
	$key = md5( $key );
	
	$value = get_transient( $key );
	
	if ( $value === false ) {
		$value = call_user_func( $method, $args );
		set_transient( $key, $value );
	}
	
	return $value;
}

get_cached( 'get_temperature', 'foo' );