Overview: Roswell, NM Roswell, NM, known for its extraterrestrial intrigue, also presents an array of earthly weather patterns. Winter months boast crisp, cool days with occasional plunges below freezing during the night. As the calendar slips into spring, you can feel the warmth returning with blooming cacti under increasingly sunny skies. Summer turns up the heat, peak temperatures soar, and late-afternoon showers offer a brief respite. The transition into autumn sees a mellowing climate, offering ideal conditions for outdoor ventures with the backdrop of auburn leaves. Regardless of the season, the semi-arid climate means low humidity, creating comfortable conditions, especially in the shade.