WordPress shortcode to fetch and display weather forecast

shortcode_weather_forecast.php

function weather_forecast_func( $atts ) {
	$atts = shortcode_atts( array(
		'city' => 'Kingston, ON'
	), $atts );

	// delete_transient( 'weather_forecast' );

	if ( false === ( $weather_forecast = get_transient( 'weather_forecast' ) ) ) {

		// $weather_forecast_raw = get_transient( 'weather_forecast_raw' );
		$city = urlencode($city);
	    $weather_forecast_raw = wp_remote_post( 'https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20weather.forecast%20where%20woeid%20in%20(select%20woeid%20from%20geo.places(1)%20where%20text%3D%22'.$city.'%22)&format=json&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys');

	    if($weather_forecast_raw['response']['code'] != 200)
			return '';

		$wf = $weather_forecast_raw['body'];
	    set_transient( 'weather_forecast_raw', $weather_forecast_raw, 24 * HOUR_IN_SECONDS );


		$wf = json_decode($wf);
		$channel  = $wf->query->results->channel;
		$forecast = $wf->query->results->channel->item->forecast;
		$units = $wf->query->results->channel->units;

		// print_r($wf);
		ob_start();

	?>
	<div class="row" id="weather_block">
		<div class="col-sm-5 col-sm-offset-6 col-md-3 col-md-offset-7">
			<div class="today"><?php echo date('l', strtotime($channel->item->condition->date)); ?></div>
			<hr />
			<div class="row">
				<div class="col-md-6">
					<span class="location"><?php echo $channel->location->city ?>,<?php echo $channel->location->region ?> </span>
					<div class="temperature">
					<?php echo FtoC($channel->item->condition->temp); ?>&deg;
					</div>
				</div>
				<div class="col-md-6">
					<img src="<?php echo get_template_directory_uri().'/images/weather/'.WeatherImageName($channel->item->condition->text); ?>" alt="<?php echo $channel->item->condition->text; ?>" class="img-responsive" />
				</div>
			</div>

			<hr />
			<div class="row">
				<div class="col-sm-6">
					<h4>Wind:</h4>
					<span>Speed:</span> <?php echo $channel->wind->speed?> <?php echo $units->speed ?> <br/>
					<span>Feels Like:</span> <?php echo FtoC($channel->wind->chill)?>&deg;<br/>
					<span>Direction:</span> <?php echo $channel->wind->direction?>&deg; <br/>

					<h4>Atmosphere:</h4>
					<span>Humidity:</span> <?php echo $channel->atmosphere->humidity?>% <br/>
					<span>Pressure:</span> <?php echo $channel->atmosphere->pressure?> <?php echo $units->pressure ?><br/>
					<!-- <span>Rising:</span> <?php echo $channel->atmosphere->rising?> <br/> -->
					<span>Visibility:</span> <?php echo $channel->atmosphere->visibility?> <?php echo $units->distance ?><br/>
				</div>
				<div class="col-sm-6">
					<br/>
					<img src="<?php echo get_template_directory_uri(); ?>/images/weather/wind.png" alt="<?php echo $channel->wind->speed?> <?php echo $units->speed ?>" class="img-responsive" style="max-width: 100px;" />
				</div>
			</div>
			<div class="row forecast">
				<?php

				$i=0;
				foreach ($forecast as $day) {
				?>
				<div class="col-sm-2">
					<div class="inner">
						<h5><?php echo $day->day; ?></h5>
						<img src="<?php echo get_template_directory_uri().'/images/weather/'.WeatherImageName($day->text); ?>" alt="<?php echo $day->text; ?>" class="img-responsive" />
						<div class="temp">
							<?php echo FtoC($day->high); ?>C
						</div>
					</div>
				</div>
				<?php
					if(++$i >= 6)
						break;
				}
				?>
			</div>
		</div>
	</div>
	<?php
		$weather_forecast = ob_get_clean();
		set_transient( 'weather_forecast', $weather_forecast, 24 * HOUR_IN_SECONDS );
	}
	return $weather_forecast;
}
add_shortcode( 'weather_forecast','weather_forecast_func' );

function WeatherImageName($str) {
	return strtolower(str_replace(' ', '_', $str)).'.png';
}

function FtoC($temp) {
	return ceil ( ($temp-32)/1.8 );
}