This is the same idea as my other temperature and humidity sensor but this one uses an ESP8266 wifi module, powered from a single 18650 battery over night and charged during the day by solar. It is also located outside
Climate at home in KIngaroy, Queensland, Australia. Measuring temperature and relative humidity with DHT22, barometric pressure with BMP085 and light with a Freetronics sensor. All connected to a Freetronics Etherten.