| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 5° | — | 22.7mm | 7.5 | 37 |
| February | 7.3° | — | 27.9mm | 6.9 | 46 |
| March | 13.9° | 2° | 37.5mm | 8.5 | 63 |
| April | 18.2° | 4.8° | 46.6mm | 8.3 | 78 |
| May | 24.4° | 8.4° | 36mm | 8.8 | 82 |
| June | 30.2° | 12.1° | 19.2mm | 3.2 | 81 |
| July | 32.9° | 15.5° | 13.6mm | 2.8 | 71 |
| August | 33.1° | 14.7° | 4.2mm | 1.3 | 73 |
| September | 29.4° | 10.5° | 2.3mm | 1.3 | 88 |
| October | 21.6° | 5.4° | 20.2mm | 5 | 90 |
| November | 12.8° | — | 29.7mm | 6.8 | 63 |
| December | 8° | — | 25.6mm | 6.1 | 49 |
January in Zanjan averages a daily high of 5°C. Expect roughly 7.5 wet days totalling 22.7mm. Demanding conditions — pack for it and plan indoor options.
February in Zanjan averages a daily high of 7.3°C. Expect roughly 6.9 wet days totalling 27.9mm. Demanding conditions — pack for it and plan indoor options.
March in Zanjan averages a daily high of 13.9°C with nights around 2°C. Expect roughly 8.5 wet days totalling 37.5mm. Generally workable, with some weather to plan around.
April in Zanjan averages a daily high of 18.2°C with nights around 4.8°C. Expect roughly 8.3 wet days totalling 46.6mm. Comfortable conditions for being outdoors all day.
May in Zanjan averages a daily high of 24.4°C with nights around 8.4°C. Expect roughly 8.8 wet days totalling 36mm. Comfortable conditions for being outdoors all day.
June in Zanjan averages a daily high of 30.2°C with nights around 12.1°C. Expect roughly 3.2 wet days totalling 19.2mm. Comfortable conditions for being outdoors all day.
July in Zanjan averages a daily high of 32.9°C with nights around 15.5°C. Rain is rare — about 2.8 wet days and 13.6mm across the month. Generally workable, with some weather to plan around.
August in Zanjan averages a daily high of 33.1°C with nights around 14.7°C. Rain is rare — about 1.3 wet days and 4.2mm across the month. Generally workable, with some weather to plan around.
September in Zanjan averages a daily high of 29.4°C with nights around 10.5°C. Rain is rare — about 1.3 wet days and 2.3mm across the month. Comfortable conditions for being outdoors all day.
October in Zanjan averages a daily high of 21.6°C with nights around 5.4°C. Expect roughly 5 wet days totalling 20.2mm. Comfortable conditions for being outdoors all day.
November in Zanjan averages a daily high of 12.8°C. Expect roughly 6.8 wet days totalling 29.7mm. Generally workable, with some weather to plan around.
December in Zanjan averages a daily high of 8°C. Expect roughly 6.1 wet days totalling 25.6mm. Demanding conditions — pack for it and plan indoor options.
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. Zanjan peaks at 90.
Based on 30 years of records, September–October scores highest for comfort in Zanjan, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 33.1°C.
April is the wettest, averaging 46.6mm of rain across roughly 8.3 wet days.
January is the coolest month, with average daily highs around 5°C.