Historical weather data, all-time temperature records, and monthly climate averages for Lake Ronkonkoma, NY. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5 in Lake Ronkonkoma sits right in that awkward shoulder of spring — expect a high near 54° and a low around 37°, with a 32% chance of rain. The date has swung from a balmy 68° in 1988 down to a brutal 24° in 1995, so don't put the layers away just yet.
Lake Ronkonkoma has seen genuine extremes over its 63-year record: a scorching 104° in July 1966 and a bone-chilling -14° in February 1967, a swing of 118 degrees. The wettest single day — 13.51 inches on August 13, 2014 — and a 23.5-inch snowstorm in January 2022 round out a location that doesn't do anything halfway.
Summer is the clear sweet spot, with highs peaking around 82–84° in mid-July, while mid-January bottoms out near 37°. If you're avoiding rain, skip mid-August — it's the wettest stretch of the year, averaging over an inch of precipitation in a single week. Spring and fall offer mild temps in the 50s–60s with manageable precipitation.