| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 3.7° | -5.4° | 86.5mm | 9.6 | 18 |
| February | 5° | -5.2° | 59.2mm | 9.3 | 23 |
| March | 9.7° | -1.1° | 89mm | 10 | 42 |
| April | 16.3° | 4.2° | 105.4mm | 11.6 | 65 |
| May | 22° | 9.9° | 111.8mm | 12.8 | 74 |
| June | 26.9° | 15.2° | 121.1mm | 12 | 76 |
| July | 29.9° | 18.1° | 127.2mm | 10.9 | 67 |
| August | 28.9° | 16.9° | 111.9mm | 10 | 72 |
| September | 24.9° | 12.7° | 95.1mm | 9 | 82 |
| October | 18.6° | 7° | 130mm | 11 | 74 |
| November | 11.8° | 0.9° | 80.5mm | 8.5 | 55 |
| December | 6.2° | -2.4° | 111.2mm | 10.7 | 28 |
January in Parsippany averages a daily high of 3.7°C with nights around -5.4°C. Expect roughly 9.6 wet days totalling 86.5mm. A hard month to visit for comfort alone.
February in Parsippany averages a daily high of 5°C with nights around -5.2°C. Expect roughly 9.3 wet days totalling 59.2mm. A hard month to visit for comfort alone.
March in Parsippany averages a daily high of 9.7°C with nights around -1.1°C. Expect roughly 10 wet days totalling 89mm. Demanding conditions — pack for it and plan indoor options.
April in Parsippany averages a daily high of 16.3°C with nights around 4.2°C. Expect roughly 11.6 wet days totalling 105.4mm. Generally workable, with some weather to plan around.
May in Parsippany averages a daily high of 22°C with nights around 9.9°C. Expect roughly 12.8 wet days totalling 111.8mm. Generally workable, with some weather to plan around.
June in Parsippany averages a daily high of 26.9°C with nights around 15.2°C. Expect roughly 12 wet days totalling 121.1mm. Comfortable conditions for being outdoors all day.
July in Parsippany averages a daily high of 29.9°C with nights around 18.1°C. Expect roughly 10.9 wet days totalling 127.2mm. Generally workable, with some weather to plan around.
August in Parsippany averages a daily high of 28.9°C with nights around 16.9°C. Expect roughly 10 wet days totalling 111.9mm. Generally workable, with some weather to plan around.
September in Parsippany averages a daily high of 24.9°C with nights around 12.7°C. Expect roughly 9 wet days totalling 95.1mm. Comfortable conditions for being outdoors all day.
October in Parsippany averages a daily high of 18.6°C with nights around 7°C. Expect roughly 11 wet days totalling 130mm. Generally workable, with some weather to plan around.
November in Parsippany averages a daily high of 11.8°C with nights around 0.9°C. Expect roughly 8.5 wet days totalling 80.5mm. Generally workable, with some weather to plan around.
December in Parsippany averages a daily high of 6.2°C with nights around -2.4°C. Expect roughly 10.7 wet days totalling 111.2mm. 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. Parsippany peaks at 82.
Based on 30 years of records, May–June scores highest for comfort in Parsippany, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 29.9°C.
October is the wettest, averaging 130mm of rain across roughly 11 wet days.
January is the coolest month, with average daily highs around 3.7°C.