#! /bin/sh

set -e

weather_station_id="$1"

metar -d "$weather_station_id" 2>&1 \
| awk '
    /METAR pattern not found in NOAA data/ {
        failures++
    }

    /^Temperature/ {
        celsius = $3;
        fahrenheit = (celsius * (9 / 5)) + 32;
        temperature = fahrenheit
    }

    END {
        if (failures > 0) {
            temperature = "--"
        }
        print temperature "°F"
    }'