[INTA hizo cambios en su sitio. Este código no funciona] Obtención de datos históricos meteorológicos desde http://siga2.inta.gov.ar/en/datoshistoricos/

inta_weather.php

<?php
class IntaWeather {
	public $endPointUrl = 'http://siga2.inta.gov.ar/en/datoshistoricos/getDatosTabla';

	// Locations and fields scrapped from http://siga2.inta.gov.ar/en/datoshistoricos/
	public $locations = [
		'eea-reconquista-reconquista' => ['id' => 294, 'idP' => 55],
		'eea-oliveros-villa-cañas' => ['id' => 299, 'idP' => 55],
	];

	// Order of elements is important. Response will content data in site predefined order.
	// Keep same order than displayed on the site
	public $fields = [
		'PrecDiaCrono',
		'TempAbrigo150Max',
		'TempAbrigo150Min',
	];

	public $block = 80; // days to request

	function executeHttpRequest($fromTime, array $params) {
		$postData = [
			'id' => $params['id'],
			'idP' => $params['idP'],
			'T' => 'False',
		];

		$postData['vars'] = join(',', $this->fields);
		$fromDate = DateTime::createFromFormat('Y-m-d|+', $fromTime);
		$fromDate->add(New DateInterval('P1D'));
		$postData['fi'] = $fromDate->format('j/m/Y');

		$fromDate->add(New DateInterval('P' . $this->block . 'D'));
		$nowDate = DateTime::createFromFormat('Y-m-d|', date('Y-m-d'));
		if ($fromDate >= $nowDate) {
			$fromDate = $nowDate;
		}
		$postData['ff'] = $fromDate->format('j/m/Y');

		$curlOptions = [
			CURLOPT_URL => $this->endPointUrl,
			CURLOPT_FOLLOWLOCATION => true,
			CURLOPT_RETURNTRANSFER => true,
			CURLOPT_TIMEOUT => 120,
			CURLOPT_POST => true,
			CURLOPT_POSTFIELDS => http_build_query($postData),
			CURLOPT_HTTPHEADER => ['X-Requested-With: XMLHttpRequest'],
		];

		$ch = curl_init();
		curl_setopt_array($ch, $curlOptions);
		$response = curl_exec($ch);
		if ($response === false) {
			$curlError = curl_error($ch);
			throw new RuntimeException('Error while performing curl: ' . $curlError);
		}
		curl_close($ch);
		$jsonData = json_decode($response, true);
		if (!$jsonData or !isset($jsonData['aaData'])) {
			echo "Invalid jsonData for postData " . print_r($postData, true);
		}

		$rows = [];
		foreach ($jsonData['aaData'] as $weatherData) {
			$rowDate = DateTime::createFromFormat('j/m/Y|', $weatherData[0]);
			$index = 1;
			$row = ['datetime' => $rowDate];
			foreach ($this->fields as $field) {
				$row[$field] = $weatherData[$index];
				$index++;
			}
			$rows[] = $row;
		}

		return $rows;
	}
}

// Usage

$weather = new IntaWeather();
$fromTime = date('Y-m-d H:i:s', strtotime('-3 days'));

foreach ($weather->locations as $name => $params) {
	$rows = $weather->executeHttpRequest($fromTime, $params);
	echo 'Weather conditions at : ' . $name;
	print_r($rows);
	echo "-----\n\n";
}