1. The temperature should be above five degrees Celsius. Geomembrane should generally be intense under low temperature while under high tempetature it should be loose. 2. The wind is Category 4. 3. In low temperature, Category 4 wind, snowy and rainy days, it cannot be constructed. 4. Weather will affect the construction and welding of geomembrane. HDPE geomembrane should be covered by sand bags.