| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 4.9° | -4.8° | 97.6mm | 11.1 | 19 |
| February | 6.4° | -4.2° | 78.7mm | 9.7 | 28 |
| March | 10.8° | -0.2° | 107.4mm | 10.5 | 46 |
| April | 17.1° | 5° | 103.2mm | 11.4 | 68 |
| May | 22.3° | 10.4° | 108.1mm | 13 | 74 |
| June | 27.4° | 15.7° | 118.2mm | 11.6 | 75 |
| July | 30.5° | 18.7° | 125.5mm | 11 | 64 |
| August | 29.5° | 17.9° | 118.9mm | 10.5 | 69 |
| September | 26° | 13.9° | 115.1mm | 9 | 82 |
| October | 19.6° | 7.2° | 111.6mm | 10.1 | 79 |
| November | 13.2° | 1.7° | 82.1mm | 8.5 | 61 |
| December | 7.6° | -1.9° | 115.9mm | 10.3 | 34 |
January in Piscataway averages a daily high of 4.9°C with nights around -4.8°C. Expect roughly 11.1 wet days totalling 97.6mm. A hard month to visit for comfort alone.
February in Piscataway averages a daily high of 6.4°C with nights around -4.2°C. Expect roughly 9.7 wet days totalling 78.7mm. A hard month to visit for comfort alone.
March in Piscataway averages a daily high of 10.8°C with nights around -0.2°C. Expect roughly 10.5 wet days totalling 107.4mm. Demanding conditions — pack for it and plan indoor options.
April in Piscataway averages a daily high of 17.1°C with nights around 5°C. Expect roughly 11.4 wet days totalling 103.2mm. Generally workable, with some weather to plan around.
May in Piscataway averages a daily high of 22.3°C with nights around 10.4°C. Expect roughly 13 wet days totalling 108.1mm. Generally workable, with some weather to plan around.
June in Piscataway averages a daily high of 27.4°C with nights around 15.7°C. Expect roughly 11.6 wet days totalling 118.2mm. Comfortable conditions for being outdoors all day.
July in Piscataway averages a daily high of 30.5°C with nights around 18.7°C. Expect roughly 11 wet days totalling 125.5mm. Generally workable, with some weather to plan around.
August in Piscataway averages a daily high of 29.5°C with nights around 17.9°C. Expect roughly 10.5 wet days totalling 118.9mm. Generally workable, with some weather to plan around.
September in Piscataway averages a daily high of 26°C with nights around 13.9°C. Expect roughly 9 wet days totalling 115.1mm. Comfortable conditions for being outdoors all day.
October in Piscataway averages a daily high of 19.6°C with nights around 7.2°C. Expect roughly 10.1 wet days totalling 111.6mm. Comfortable conditions for being outdoors all day.
November in Piscataway averages a daily high of 13.2°C with nights around 1.7°C. Expect roughly 8.5 wet days totalling 82.1mm. Generally workable, with some weather to plan around.
December in Piscataway averages a daily high of 7.6°C with nights around -1.9°C. Expect roughly 10.3 wet days totalling 115.9mm. A hard month to visit for comfort alone.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Piscataway peaks at 82.
Based on 30 years of records, May–June scores highest for comfort in Piscataway, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 30.5°C.
July is the wettest, averaging 125.5mm of rain across roughly 11 wet days.
January is the coolest month, with average daily highs around 4.9°C.