| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -19.7° | -29.6° | 4.9mm | 4.8 | 20 |
| February | -13.8° | -25.6° | 3.5mm | 3.1 | 24 |
| March | -3.5° | -15.6° | 7.6mm | 4.2 | 22 |
| April | 9.8° | -3.1° | 14mm | 4.9 | 50 |
| May | 18.9° | 4.6° | 22.9mm | 5.8 | 85 |
| June | 25.2° | 12° | 52.5mm | 10.1 | 80 |
| July | 26.8° | 15.5° | 99.9mm | 13.2 | 74 |
| August | 25.2° | 12.8° | 73.9mm | 9.7 | 81 |
| September | 18.9° | 5.2° | 30.3mm | 6.3 | 84 |
| October | 8.5° | -3.9° | 16.9mm | 5.3 | 44 |
| November | -6.2° | -16.8° | 8.3mm | 5.7 | 19 |
| December | -17.2° | -26.8° | 8.1mm | 6.8 | 16 |
January in Hailar averages a daily high of -19.7°C with nights around -29.6°C. Expect roughly 4.8 wet days totalling 4.9mm. A hard month to visit for comfort alone.
February in Hailar averages a daily high of -13.8°C with nights around -25.6°C. Expect roughly 3.1 wet days totalling 3.5mm. A hard month to visit for comfort alone.
March in Hailar averages a daily high of -3.5°C with nights around -15.6°C. Expect roughly 4.2 wet days totalling 7.6mm. A hard month to visit for comfort alone.
April in Hailar averages a daily high of 9.8°C with nights around -3.1°C. Expect roughly 4.9 wet days totalling 14mm. Demanding conditions — pack for it and plan indoor options.
May in Hailar averages a daily high of 18.9°C with nights around 4.6°C. Expect roughly 5.8 wet days totalling 22.9mm. Comfortable conditions for being outdoors all day.
June in Hailar averages a daily high of 25.2°C with nights around 12°C. Expect roughly 10.1 wet days totalling 52.5mm. Comfortable conditions for being outdoors all day.
July in Hailar averages a daily high of 26.8°C with nights around 15.5°C. Expect roughly 13.2 wet days totalling 99.9mm. Generally workable, with some weather to plan around.
August in Hailar averages a daily high of 25.2°C with nights around 12.8°C. Expect roughly 9.7 wet days totalling 73.9mm. Comfortable conditions for being outdoors all day.
September in Hailar averages a daily high of 18.9°C with nights around 5.2°C. Expect roughly 6.3 wet days totalling 30.3mm. Comfortable conditions for being outdoors all day.
October in Hailar averages a daily high of 8.5°C with nights around -3.9°C. Expect roughly 5.3 wet days totalling 16.9mm. Demanding conditions — pack for it and plan indoor options.
November in Hailar averages a daily high of -6.2°C with nights around -16.8°C. Expect roughly 5.7 wet days totalling 8.3mm. A hard month to visit for comfort alone.
December in Hailar averages a daily high of -17.2°C with nights around -26.8°C. Expect roughly 6.8 wet days totalling 8.1mm. 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. Hailar peaks at 85.
Based on 30 years of records, May–June scores highest for comfort in Hailar, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 26.8°C.
July is the wettest, averaging 99.9mm of rain across roughly 13.2 wet days.
January is the coolest month, with average daily highs around -19.7°C.