| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | -11.5° | -22.6° | 31.6mm | 13.3 | 3 |
| February | -7.4° | -20.1° | 23.3mm | 9.5 | 11 |
| March | 0.7° | -11.5° | 28.6mm | 10.3 | 9 |
| April | 12° | -0.7° | 39.7mm | 10.4 | 50 |
| May | 20.6° | 5.8° | 56mm | 11.5 | 77 |
| June | 25.1° | 11.8° | 55.5mm | 11.5 | 77 |
| July | 26.5° | 13.9° | 67.4mm | 12.9 | 74 |
| August | 25.2° | 11.2° | 51.1mm | 10.7 | 79 |
| September | 18.5° | 5.2° | 37.8mm | 10.8 | 74 |
| October | 10° | -0.9° | 50.3mm | 13 | 38 |
| November | -1.3° | -9.9° | 52.8mm | 14.8 | 0 |
| December | -8.4° | -18° | 39.9mm | 14.7 | 1 |
January in Biysk averages a daily high of -11.5°C with nights around -22.6°C. Expect roughly 13.3 wet days totalling 31.6mm. A hard month to visit for comfort alone.
February in Biysk averages a daily high of -7.4°C with nights around -20.1°C. Expect roughly 9.5 wet days totalling 23.3mm. A hard month to visit for comfort alone.
March in Biysk averages a daily high of 0.7°C with nights around -11.5°C. Expect roughly 10.3 wet days totalling 28.6mm. A hard month to visit for comfort alone.
April in Biysk averages a daily high of 12°C with nights around -0.7°C. Expect roughly 10.4 wet days totalling 39.7mm. Demanding conditions — pack for it and plan indoor options.
May in Biysk averages a daily high of 20.6°C with nights around 5.8°C. Expect roughly 11.5 wet days totalling 56mm. Comfortable conditions for being outdoors all day.
June in Biysk averages a daily high of 25.1°C with nights around 11.8°C. Expect roughly 11.5 wet days totalling 55.5mm. Comfortable conditions for being outdoors all day.
July in Biysk averages a daily high of 26.5°C with nights around 13.9°C. Expect roughly 12.9 wet days totalling 67.4mm. Generally workable, with some weather to plan around.
August in Biysk averages a daily high of 25.2°C with nights around 11.2°C. Expect roughly 10.7 wet days totalling 51.1mm. Comfortable conditions for being outdoors all day.
September in Biysk averages a daily high of 18.5°C with nights around 5.2°C. Expect roughly 10.8 wet days totalling 37.8mm. Generally workable, with some weather to plan around.
October in Biysk averages a daily high of 10°C with nights around -0.9°C. Expect roughly 13 wet days totalling 50.3mm. Demanding conditions — pack for it and plan indoor options.
November in Biysk averages a daily high of -1.3°C with nights around -9.9°C. Expect roughly 14.8 wet days totalling 52.8mm. A hard month to visit for comfort alone.
December in Biysk averages a daily high of -8.4°C with nights around -18°C. Expect roughly 14.7 wet days totalling 39.9mm. 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. Biysk peaks at 79.
Based on 30 years of records, May–September scores highest for comfort in Biysk, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 26.5°C.
July is the wettest, averaging 67.4mm of rain across roughly 12.9 wet days.
January is the coolest month, with average daily highs around -11.5°C.