All pressure data is reported as sea-level pressure.

Depending on the quality of the station,.

So summer data is in daylight savings time and winter data is in standard time. However, there are a few important points to note about processing the data once it’s downloaded:

Next, update the path to chromedriver in scrape_wunderground.py: # Set the absolute path to chromedriverĬhromedriver_path = '/path/to/chromedriver'Īs long as BeautifulSoup and Selenium are installed, the script should work fine after that. It’s also possible to use something other than Chrome, for example geckodriver for Firefox or safaridriver for Safari. Note that you have to match the ChromeDriver version to whichever version of Chrome is installed on your machine. To run the script, the first thing to do is ensure that ChromeDriver is installed. WebDriver is an toolbox for natively running web browsers, so when you render a page with WebDriver, Weather Underground thinks a regular user is accessing their website and you can access the full source code. This is where Selenium WebDriver comes in. Weather Underground has a security policy that blocks automated requests from viewing data stored in each table.

It’s possible to view tables of 5-min data from a single day – see this example from a station outside Crested Butte, Colorado – but if you try to scrape the http using something like Python’s requests library, the tables appear blank. Unfortunately, historical data are not easy to access. Weather Undergound stores data from over 250,000 personal weather stations across the world.

Underground weather station