Let's write a basic program without Johnny-Five to collect our data on the Pi before adding in our LCD. In a file on your Pi or ready to be moved to your Pi called weather-test.js:

const request = require('request')

setInterval(() => {
  request({
    url: 'http://api.openweathermap.org/data/2.5/weather',
    qs: {
      q: [your city],
      appid: [your API key],
      units: ['metric' or 'imperial']
    },
    json: true // returns the parsed json body for us
  }, (err, resp, body) => {
    console.log(body)
  })
}, 60000)