PWS Forecast API - What exactly is the temperature value?

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  • Question
  • Updated 1 week ago
Hi, I'm developing a program using the PWS API, and I've come across three fields with seemingly conflicting descriptions.

In the API documentation, 'temperature' is not described clearly. From what I could tell it seems to be a 'feels like' temperature, however this would conflict with the descriptions of 'temperatureHeatIndex' and 'temperatureWindChill'. For example, as far as I can tell 'temperatureHeatIndex' is supposed to be the same as 'temperature' when the temperature is below 65F (18C), whereas in the following example (in celsius) it has a different value to the 'temperature' field:
"temperature": [
null,
2,
8,
1,
9,
0,
9,
2,
8,
-1,
8,
-1
],
"temperatureHeatIndex": [
null,
6,
8,
3,
8,
3,
9,
5,
7,
2,
8,
2
],
"temperatureWindChill": [
null,
1,
1,
-2,
-2,
-2,
1,
0,
-1,
-3,
-3,
-3
],
In this example, despite all temperatures being below 18C, each value is different. So I would like some clarification on what exactly 'temperature' is and is 'temperatureHeatIndex'/'temperatureWindChill' ever equal to 'temperature' (as it says in the documentation).

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Shea Smith

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Posted 2 weeks ago

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Photo of Paul Hutch

Paul Hutch

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Wind Chill is temperature modified for the effect of the wind it is limited to:
Windchill temperature is defined only for temperatures at or below 10 °C (50 °F) and wind speeds above 4.8 kilometres per hour (3.0 mph).
https://en.wikipedia.org/wiki/Wind_chill
click the image at the top of the page to see a larger chart.

Heat Index is temperature modified for the effect of relative humidity.
https://en.wikipedia.org/wiki/Heat_index
Scroll down for a table of values