Historical weather data, all-time temperature records, and monthly climate averages for Greenlawn, NY. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Greenlawn typically lands in that awkward in-between zone — average highs of 54° and lows of 37°, with a real shot at frost on bad years (the record low on this date is 24°, set in 1995). There's about a 1-in-3 chance of rain today historically, though snow is nearly off the table at just 2%.
Greenlawn has seen some genuinely extreme weather over its 63 years of records — from a scorching 104° on July 3, 1966, to a brutal -14° on February 13, 1967, a swing of 118 degrees. The wettest single day on record dropped an astonishing 13.51 inches of rain on August 13, 2014, and the snowiest dumped 23.5 inches in a single January 2022 storm.
Greenlawn peaks in warmth the week of July 16-22 with average highs of 84°, while mid-January is the coldest stretch at just 37°. The wettest period is mid-August, averaging over an inch of rain per week — something to keep in mind for late-summer plans. Spring and fall are mild and dry by comparison, making them the sweet spots for visiting.