Weather Info from API

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yr.no provides free detailed forecast API.
This example will check if there will be snow in the next day. You only need to adjust your location (latitude/longitude) and the status object address. There might be some limits on how often the API can be accessed so create a scheduled script that runs every 3 hours or so.

Code:

latitude = 60.3894
longitude = 5.33
status = '1/1/1'

json = require('json')
http = require('socket.http')

args = 'lat=' .. latitude .. '&lon=' .. longitude
url = 'https://api.met.no/weatherapi/locationforecast/2.0/compact?' .. args
mac = 0
io.readfile('/sys/class/net/eth0/address'):gsub('%x%x', function(v)
  mac = mac * 256 + tonumber(v, 16)
end)
http.USERAGENT = 'LM ' .. mac

res, err = http.request(url)
data = json.pdecode(res)

if type(data) == 'table' then
  date = os.date('*t')
  date.day = date.day + 1
  time = os.time(date)
  timestamp = os.date('%Y-%m-%d', time)

  snow = false

  for i, entry in ipairs(data.properties.timeseries) do
    if entry.time:sub(1, #timestamp) == timestamp then

      next1h = entry.data.next_1_hours
      code = ''

      if type(next1h) == 'table' and type(next1h.summary) == 'table' then
        code = next1h.summary.symbol_code or ''
      end

      if code:find('snow') then
        snow = true
        break
      end
    end
  end

  grp.checkwrite(status, snow)
end