| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 11.7° | — | 147.3mm | 11.7 | 50 |
| February | 10.6° | 6.3° | 119.6mm | 10.6 | 49 |
| March | 13.1° | 8.5° | 82.8mm | 10.4 | 57 |
| April | 17° | 12.4° | 55.9mm | 8.5 | 73 |
| May | 22.8° | 17.6° | 32.8mm | 7.9 | 84 |
| June | 28.6° | 22.3° | 37.2mm | 4.2 | 85 |
| July | 30.3° | 23.6° | 68.7mm | 5.8 | 75 |
| August | 30.3° | 23.7° | 119.3mm | 6.3 | 74 |
| September | 26.9° | 20.3° | 247.1mm | 11.2 | 78 |
| October | 22.2° | 16.7° | 286.1mm | 13.3 | 73 |
| November | 16.9° | 12.2° | 279.3mm | 12.6 | 65 |
| December | 13.5° | — | 158.3mm | 11.6 | 56 |
January in Lāhījān averages a daily high of 11.7°C. Expect roughly 11.7 wet days totalling 147.3mm. Demanding conditions — pack for it and plan indoor options.
February in Lāhījān averages a daily high of 10.6°C with nights around 6.3°C. Expect roughly 10.6 wet days totalling 119.6mm. Demanding conditions — pack for it and plan indoor options.
March in Lāhījān averages a daily high of 13.1°C with nights around 8.5°C. Expect roughly 10.4 wet days totalling 82.8mm. Generally workable, with some weather to plan around.
April in Lāhījān averages a daily high of 17°C with nights around 12.4°C. Expect roughly 8.5 wet days totalling 55.9mm. Generally workable, with some weather to plan around.
May in Lāhījān averages a daily high of 22.8°C with nights around 17.6°C. Expect roughly 7.9 wet days totalling 32.8mm. Comfortable conditions for being outdoors all day.
June in Lāhījān averages a daily high of 28.6°C with nights around 22.3°C. Expect roughly 4.2 wet days totalling 37.2mm. Comfortable conditions for being outdoors all day.
July in Lāhījān averages a daily high of 30.3°C with nights around 23.6°C. Expect roughly 5.8 wet days totalling 68.7mm. Comfortable conditions for being outdoors all day.
August in Lāhījān averages a daily high of 30.3°C with nights around 23.7°C. Expect roughly 6.3 wet days totalling 119.3mm. Generally workable, with some weather to plan around.
September in Lāhījān averages a daily high of 26.9°C with nights around 20.3°C. Expect roughly 11.2 wet days totalling 247.1mm. Comfortable conditions for being outdoors all day.
October in Lāhījān averages a daily high of 22.2°C with nights around 16.7°C. Expect roughly 13.3 wet days totalling 286.1mm. Generally workable, with some weather to plan around.
November in Lāhījān averages a daily high of 16.9°C with nights around 12.2°C. Expect roughly 12.6 wet days totalling 279.3mm. Generally workable, with some weather to plan around.
December in Lāhījān averages a daily high of 13.5°C. Expect roughly 11.6 wet days totalling 158.3mm. Generally workable, with some weather to plan around.
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. Lāhījān peaks at 85.
Based on 30 years of records, May–June scores highest for comfort in Lāhījān, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 30.3°C.
October is the wettest, averaging 286.1mm of rain across roughly 13.3 wet days.
February is the coolest month, with average daily highs around 10.6°C.