Add paramater so that provider calculates the elevation. This is the default in the API, but not with this program.

prototype.js

@@ -32,19 +32,26 @@ const days_fore_max = 16;
 const days_fore_default = 12;
 const days_past_default =  2;
 
+const ft_to_m = 0.3048;
+
 const argv = yargs(hideBin(process.argv))
   .option('days_fore', {
     alias: 'f',
-    describe: 'Set forecast days',
+    describe: 'Set forecast days, such as "-f 10". Maximum of 16.',
     type: 'number',
     requiresArg: true,
   })
   .option('days_past', {
     alias: 'p',
-    describe: 'Set past days',
+    describe: 'Set past days, such as "-p 3"',
     type: 'number',
     requiresArg: true,
   })
+  .option('calc_elevation', {
+    alias: 'e',
+    describe: 'Set to calculate elevation at lat/long.',
+    type: 'boolean',
+  })
   .check((argv) => {
     if (argv.f !== undefined && (isNaN(argv.f) || argv.f < 0)) {
       throw new Error('Forecast days must be a non-negative number');
@@ -66,10 +73,13 @@ function max (value, upper) {
 }
 const days_fore = max(argv.hasOwnProperty("days_fore") ? argv.days_fore : days_fore_default, days_fore_max);
 const days_past = argv.hasOwnProperty("days_past") ? argv.days_past : days_past_default;
+const calc_elevation = argv.calc_elevation ? true : false;
 
 const days = days_fore + days_past;
 
 console.log(`Averaging for ${days} days: ${days_fore} forecasted, ${days_past} past.`);
+if (calc_elevation) console.log("Calculating elevation rather than using provided values.");
+else console.log("Using user-provided elevations when they exist.");
 
 const locations = [
   //{ name: "Flagstaff, AZ",  lat: 35.1983,  lon: -111.6513, elevation: 6903 },
@@ -93,8 +103,8 @@ const locations = [
   { name: "Cherry: ++",     lat: 34.5781,  lon: -112.0677, elevation: 5300 },
   //{ name: "Sedona: NG",     lat: 34.8697,  lon: -111.7610, elevation: 4420 },
   //{ name: "Ehrenberg, AZ",  lat: 33.9897,  lon: -114.3550, elevation: 333  },
-  { name: "Ehrenberg: ++",  lat: 33.9897,  lon: -114.3550, elevation: 333  },
-  { name: "Quartzsite: ++", lat: 33.6763,  lon: -114.2104, elevation: 888  },
+  { name: "Ehrenberg: ++",  lat: 33.9897,  lon: -114.3550, elevation: 300 },
+  { name: "Quartzsite: ++", lat: 33.6763,  lon: -114.2104, elevation: 900 },
 ];
 locations.sort((a, b) => a.elevation - b.elevation);
 
@@ -155,7 +165,7 @@ async function getForecast(loc) {
   const url = new URL("https://api.open-meteo.com/v1/forecast");
   url.searchParams.set("latitude", loc.lat);
   url.searchParams.set("longitude", loc.lon);
-  url.searchParams.set("elevation", loc.elevation * 0.3048);
+  if (!calc_elevation && loc.elevation) url.searchParams.set("elevation", loc.elevation * ft_to_m);
   url.searchParams.set("daily", "temperature_2m_max,temperature_2m_min,apparent_temperature_max,apparent_temperature_min");
   url.searchParams.set("temperature_unit", "fahrenheit");
   url.searchParams.set("precipitation_unit", "inch");
@@ -179,7 +189,9 @@ async function getForecast(loc) {
   const avgHigh2 = (highs2.reduce((a, b) => a + b, 0) / highs2.length).toFixed(1);
   const avgLow2  = (lows2.reduce((a, b) => a + b, 0) / lows2.length).toFixed(1);
 
-  return { name: loc.name, elevation: loc.elevation, avgHigh, avgLow, avgHigh2, avgLow2 };
+  const elev = (!calc_elevation && loc.elevation) ? loc.elevation : (data.elevation / ft_to_m).toFixed(0);
+
+  return { name: loc.name, elevation: elev, avgHigh, avgLow, avgHigh2, avgLow2 };
 }
 
 (async () => {