December in Gyumri averages a daily high of -0.3°C with nights around -9.8°C. Expect roughly 4.4 wet days totalling 34.7mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Gyumri is June–September.
Based on AMASIA, AM (1.6km), 1995–2024. 21 years of December data.