How do I calculate the temperature in celsius returned in openweathermap.org JSON?

StackOverflow https://stackoverflow.com/questions/19477324

Question

I'm getting the weather for a city using openweathermap.org.

The jsonp call is working and everything is fine but the resulting object contains the temperature in an unknown unit:

{
    //...
    "main": {
        "temp": 290.38, // What unit of measurement is this?
        "pressure": 1005,
        "humidity": 72,
        "temp_min": 289.25,
        "temp_max": 291.85
    },
    //...
}

Here is a demo that console.log's the full object.

I don't think the resulting temperature is in fahrenheit because converting 290.38 fahrenheit to celsius is 143.544.

Does anyone know what temperature unit openweathermap is returning?

Was it helpful?

Solution

It looks like kelvin. Converting kelvin to celsius is easy: Just subtract 273.15.

Looking at the API documentation, if you add &units=metric to your request, you'll get back celsius.

OTHER TIPS

Kelvin to Fahrenheit is:

(( kelvinValue - 273.15) * 9/5) + 32

I've noticed not all of the OpenWeatherApp calls read the units parameter if its passed in. (An example of this error: http://api.openweathermap.org/data/2.5/group?units=Imperial&id=5375480,4737316,4164138,5099133,4666102,5391811,5809844,5016108,4400860,4957280&appid=XXXXXX) Kelvin is still returned.

You can change the unit to metric.

This is my code.

<head>
    <script src="http://code.jquery.com/jquery-1.6.1.min.js"></script>
        <script src="http://code.jquery.com/ui/1.10.2/jquery-ui.min.js"></script>
        <style type="text/css">]
        body{
            font-size: 100px;

        }

        #weatherLocation{

            font-size: 40px;
        }
        </style>
        </head>
        <body>
<div id="weatherLocation">Click for weather</div>

<div id="location"><input type="text" name="location"></div>

<div class="showHumidity"></div>

<div class="showTemp"></div>

<script type="text/javascript">
$(document).ready(function() {
  $('#weatherLocation').click(function() {
    var city = $('input:text').val();
    let request = new XMLHttpRequest();
    let url = `http://api.openweathermap.org/data/2.5/weather?q=${city}&units=metric&appid=[YOUR API KEY HERE]`;


    request.onreadystatechange = function() {
      if (this.readyState === 4 && this.status === 200) {
        let response = JSON.parse(this.responseText);
        getElements(response);
      }
    }

    request.open("GET", url, true);
    request.send();

    getElements = function(response) {
      $('.showHumidity').text(`The humidity in ${city} is ${response.main.humidity}%`);
      $('.showTemp').text(`The temperature in Celcius is ${response.main.temp} degrees.`);
    }
  });
});
</script>

</body>

First Determine which Format do you want. Add Only &mode=json&units=metric after you send city in your BASE_URL. You will get dirrect Celsius value from the server.

Try this example

curl --location --request GET 'http://api.openweathermap.org/data/2.5/weather?q=Manaus,br&APPID=your_api_key&lang=PT&units=metric'
Licensed under: CC-BY-SA with attribution
Not affiliated with StackOverflow
scroll top