A year 365 days, whether rainy or windy day, global meteorological station has to release weather balloon in a certain time and certain place, and share detected altitude data through internal system of world meteorological organization where head office set in Geneva. Every weather balloon carry a radiosonde, collected temperature, humidity, air pressure, air speed and wind direction from ground to 30,000m height altitude. Temperature is too low in 30,000m height altitude, balloon will burst according to weather situation.
You can buy a high altitude balloon from: High Altitude Balloon
You can buy a high altitude balloon from: High Altitude Balloon