The CRL 95CGRY Gray 95C Silicone Building Sealant can be applied at outdoor temperatures as low as -20 degreeF (-29 degreeC) up to 130 degreeF (54.4 degreeC), provided surfaces are clean, dry, and frost-free. Once cured, the sealant will perform effectively in temperatures ranging from -40 degreeF (-40 degreeC) to 350 degreeF (177 degreeC).