Add in a windchill calculator.

src/lib.rs

@@ -22,7 +22,17 @@ impl Temperature {
     fn to_fahrenheit(&self) -> f32 {
         self.celsius * 1.8 + 32.0
     }
+
+    fn windchill(&self, wind_speed_kph: f32) -> f32 {
+        // From https://www.weather.gov/media/epz/wxcalc/windChill.pdf
+        // And https://www.calcunation.com/calculator/wind-chill-celsius.php
+        13.12 + (0.6215 * self.celsius) - (11.37 * wind_speed_kph.powf(0.16))
+            + (0.3965 * self.celsius * wind_speed_kph.powf(0.16))
     }
+}
+
+// Refer to: https://www.weather.gov/epz/wxcalc_windchill
+// TODO: Add a test that -20 C and 32 kph feels like -32.9
 
 #[pyfunction]
 fn batch_converter(temperatures: Vec<f32>) -> Vec<f32> {