| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 12.9° | 5.9° | 99.8mm | 12.3 | 53 |
| February | 13.6° | 6.3° | 102mm | 11.3 | 57 |
| March | 16.9° | 8.4° | 107.5mm | 11 | 68 |
| April | 20.3° | 10.7° | 66.5mm | 9 | 82 |
| May | 25° | 14.1° | 42.8mm | 7.5 | 85 |
| June | 30.6° | 18.7° | 14.2mm | 2.7 | 80 |
| July | 35.3° | 22.7° | 4mm | 1.1 | 65 |
| August | 34.8° | 22.4° | 7.3mm | 1.6 | 66 |
| September | 29.5° | 18.5° | 25.5mm | 5.1 | 80 |
| October | 25.2° | 14.8° | 44.5mm | 6 | 88 |
| November | 17.4° | 9.6° | 105mm | 12.1 | 67 |
| December | 13.8° | 7.2° | 100.5mm | 10.6 | 59 |
January in Aïn Defla averages a daily high of 12.9°C with nights around 5.9°C. Expect roughly 12.3 wet days totalling 99.8mm. Demanding conditions — pack for it and plan indoor options.
February in Aïn Defla averages a daily high of 13.6°C with nights around 6.3°C. Expect roughly 11.3 wet days totalling 102mm. Generally workable, with some weather to plan around.
March in Aïn Defla averages a daily high of 16.9°C with nights around 8.4°C. Expect roughly 11 wet days totalling 107.5mm. Generally workable, with some weather to plan around.
April in Aïn Defla averages a daily high of 20.3°C with nights around 10.7°C. Expect roughly 9 wet days totalling 66.5mm. Comfortable conditions for being outdoors all day.
May in Aïn Defla averages a daily high of 25°C with nights around 14.1°C. Expect roughly 7.5 wet days totalling 42.8mm. Comfortable conditions for being outdoors all day.
June in Aïn Defla averages a daily high of 30.6°C with nights around 18.7°C. Rain is rare — about 2.7 wet days and 14.2mm across the month. Comfortable conditions for being outdoors all day.
July in Aïn Defla averages a daily high of 35.3°C with nights around 22.7°C. Rain is rare — about 1.1 wet days and 4mm across the month. Generally workable, with some weather to plan around.
August in Aïn Defla averages a daily high of 34.8°C with nights around 22.4°C. Rain is rare — about 1.6 wet days and 7.3mm across the month. Generally workable, with some weather to plan around.
September in Aïn Defla averages a daily high of 29.5°C with nights around 18.5°C. Expect roughly 5.1 wet days totalling 25.5mm. Comfortable conditions for being outdoors all day.
October in Aïn Defla averages a daily high of 25.2°C with nights around 14.8°C. Expect roughly 6 wet days totalling 44.5mm. Comfortable conditions for being outdoors all day.
November in Aïn Defla averages a daily high of 17.4°C with nights around 9.6°C. Expect roughly 12.1 wet days totalling 105mm. Generally workable, with some weather to plan around.
December in Aïn Defla averages a daily high of 13.8°C with nights around 7.2°C. Expect roughly 10.6 wet days totalling 100.5mm. 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. Aïn Defla peaks at 88.
Based on 30 years of records, April–June scores highest for comfort in Aïn Defla, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 35.3°C.
March is the wettest, averaging 107.5mm of rain across roughly 11 wet days.
January is the coolest month, with average daily highs around 12.9°C.