| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -15.9° | -26.2° | 4.4mm | 3.5 | 23 |
| February | -9.9° | -21.6° | 3.5mm | 2.7 | 25 |
| March | 0.5° | -10.8° | 12mm | 4.7 | 21 |
| April | 12.1° | -0.2° | 25.2mm | 6.1 | 59 |
| May | 20.5° | 7.3° | 47.1mm | 10.1 | 80 |
| June | 25.9° | 14.3° | 101.4mm | 12.3 | 75 |
| July | 27.2° | 17.9° | 141.8mm | 12.8 | 74 |
| August | 25.4° | 15.3° | 140.9mm | 12.8 | 74 |
| September | 20.5° | 8.1° | 53.5mm | 7.5 | 85 |
| October | 10.8° | -0.5° | 21.4mm | 5.1 | 57 |
| November | -2.7° | -12.5° | 12mm | 4.7 | 21 |
| December | -13.6° | -23.5° | 6.5mm | 4.5 | 21 |
January in Hailun averages a daily high of -15.9°C with nights around -26.2°C. Expect roughly 3.5 wet days totalling 4.4mm. A hard month to visit for comfort alone.
February in Hailun averages a daily high of -9.9°C with nights around -21.6°C. Rain is rare — about 2.7 wet days and 3.5mm across the month. A hard month to visit for comfort alone.
March in Hailun averages a daily high of 0.5°C with nights around -10.8°C. Expect roughly 4.7 wet days totalling 12mm. A hard month to visit for comfort alone.
April in Hailun averages a daily high of 12.1°C with nights around -0.2°C. Expect roughly 6.1 wet days totalling 25.2mm. Generally workable, with some weather to plan around.
May in Hailun averages a daily high of 20.5°C with nights around 7.3°C. Expect roughly 10.1 wet days totalling 47.1mm. Comfortable conditions for being outdoors all day.
June in Hailun averages a daily high of 25.9°C with nights around 14.3°C. Expect roughly 12.3 wet days totalling 101.4mm. Comfortable conditions for being outdoors all day.
July in Hailun averages a daily high of 27.2°C with nights around 17.9°C. Expect roughly 12.8 wet days totalling 141.8mm. Generally workable, with some weather to plan around.
August in Hailun averages a daily high of 25.4°C with nights around 15.3°C. Expect roughly 12.8 wet days totalling 140.9mm. Generally workable, with some weather to plan around.
September in Hailun averages a daily high of 20.5°C with nights around 8.1°C. Expect roughly 7.5 wet days totalling 53.5mm. Comfortable conditions for being outdoors all day.
October in Hailun averages a daily high of 10.8°C with nights around -0.5°C. Expect roughly 5.1 wet days totalling 21.4mm. Generally workable, with some weather to plan around.
November in Hailun averages a daily high of -2.7°C with nights around -12.5°C. Expect roughly 4.7 wet days totalling 12mm. A hard month to visit for comfort alone.
December in Hailun averages a daily high of -13.6°C with nights around -23.5°C. Expect roughly 4.5 wet days totalling 6.5mm. 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. Hailun peaks at 85.
Based on 30 years of records, May scores highest for comfort in Hailun, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 27.2°C.
July is the wettest, averaging 141.8mm of rain across roughly 12.8 wet days.
January is the coolest month, with average daily highs around -15.9°C.