Rossi posits that the chances of survival for the missing daughter are not good, given that temperatures are predicted to be in the 20s that night. Later, however, when they are out searching, it is not freezing at all but rather pouring rain.
The super (screen with text) following the flashback at the beginning reads, "Two years later..." However, it is mentioned many times in the episode (and it is written in the description) that only one year has passed between events.
When Hotch gets a text from JJ saying "Neighbor heard a fight Monday night," he taps the screen, and you can clearly see that it was picture 2 of 2 in the camera roll and not an actual text message.
The story takes place in Salisbury, Maryland, during February; however, the deciduous trees were full of green leaves.