| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 5.8° | -5.5° | 6mm | 2.4 | 39 |
| February | 10.3° | -1.4° | 9.2mm | 2.7 | 58 |
| March | 17° | 4.2° | 13.7mm | 3.2 | 84 |
| April | 23.4° | 10° | 32.7mm | 5.6 | 89 |
| May | 28.6° | 15.2° | 49.7mm | 6.4 | 81 |
| June | 32.9° | 20.4° | 52.3mm | 6.4 | 64 |
| July | 33.3° | 23° | 102.7mm | 8.9 | 57 |
| August | 31.4° | 21.7° | 90.7mm | 8.5 | 65 |
| September | 26.8° | 16.7° | 94.4mm | 9 | 82 |
| October | 20.9° | 9.9° | 49.3mm | 7.3 | 85 |
| November | 13.6° | 2.2° | 18.8mm | 4 | 72 |
| December | 6.9° | -4.2° | 3.6mm | 1.7 | 45 |
January in Sanmenxia averages a daily high of 5.8°C with nights around -5.5°C. Rain is rare — about 2.4 wet days and 6mm across the month. Demanding conditions — pack for it and plan indoor options.
February in Sanmenxia averages a daily high of 10.3°C with nights around -1.4°C. Rain is rare — about 2.7 wet days and 9.2mm across the month. Generally workable, with some weather to plan around.
March in Sanmenxia averages a daily high of 17°C with nights around 4.2°C. Expect roughly 3.2 wet days totalling 13.7mm. Comfortable conditions for being outdoors all day.
April in Sanmenxia averages a daily high of 23.4°C with nights around 10°C. Expect roughly 5.6 wet days totalling 32.7mm. Comfortable conditions for being outdoors all day.
May in Sanmenxia averages a daily high of 28.6°C with nights around 15.2°C. Expect roughly 6.4 wet days totalling 49.7mm. Comfortable conditions for being outdoors all day.
June in Sanmenxia averages a daily high of 32.9°C with nights around 20.4°C. Expect roughly 6.4 wet days totalling 52.3mm. Generally workable, with some weather to plan around.
July in Sanmenxia averages a daily high of 33.3°C with nights around 23°C. Expect roughly 8.9 wet days totalling 102.7mm. Generally workable, with some weather to plan around.
August in Sanmenxia averages a daily high of 31.4°C with nights around 21.7°C. Expect roughly 8.5 wet days totalling 90.7mm. Generally workable, with some weather to plan around.
September in Sanmenxia averages a daily high of 26.8°C with nights around 16.7°C. Expect roughly 9 wet days totalling 94.4mm. Comfortable conditions for being outdoors all day.
October in Sanmenxia averages a daily high of 20.9°C with nights around 9.9°C. Expect roughly 7.3 wet days totalling 49.3mm. Comfortable conditions for being outdoors all day.
November in Sanmenxia averages a daily high of 13.6°C with nights around 2.2°C. Expect roughly 4 wet days totalling 18.8mm. Generally workable, with some weather to plan around.
December in Sanmenxia averages a daily high of 6.9°C with nights around -4.2°C. Rain is rare — about 1.7 wet days and 3.6mm across the month. 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. Sanmenxia peaks at 89.
Based on 30 years of records, March–May scores highest for comfort in Sanmenxia, balancing daytime temperature against rainfall.
July is the warmest, averaging a daily high of 33.3°C.
July is the wettest, averaging 102.7mm of rain across roughly 8.9 wet days.
January is the coolest month, with average daily highs around 5.8°C.