In summer it gets quite hot (+25 ... +35 Celcius), in Bishkek it can get hotter.
In winter it can get to -10 ... - 15 Celcius at night, during day time it can be closer to -5 ... 0 Celcius, sometimes warmer.
When you go higher to the mountains, it will even be colder there. It is important to bring right type of clothes for winter adventures in Kyrgyzstan (winter jacket, warm pants, gloves, warm hat).