subfreezing
adjective
                                                                                                                            
                                                            sub·freez·ing
                    
                                                                                                              
                                                                                                                                  ˈsəb-ˈfrē-ziŋ 
                                                      
                                                          
            
                                
              
          
                                                      : being or marked by temperature below the freezing point (as of water)                                      
              
                             
subfreezing weather
                         
                
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  Merriam-Webster unabridged




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