| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 13.1° | 1.7° | 70.5mm | 7.8 | 62 |
| February | 15.4° | 3.8° | 85.7mm | 8.4 | 68 |
| March | 20.7° | 9.1° | 100mm | 9 | 82 |
| April | 24.2° | 12.8° | 92.9mm | 7.6 | 85 |
| May | 28.2° | 17.8° | 137.7mm | 9.7 | 76 |
| June | 32.9° | 22.6° | 98.4mm | 6.7 | 63 |
| July | 34.9° | 24.3° | 54.3mm | 5.1 | 58 |
| August | 35.4° | 24.5° | 59.2mm | 5.2 | 56 |
| September | 31.3° | 20.3° | 82.6mm | 6.1 | 71 |
| October | 25.8° | 13.8° | 125.9mm | 7.6 | 85 |
| November | 19.4° | 7.9° | 75.7mm | 7 | 84 |
| December | 14.8° | 3.7° | 80.4mm | 8.2 | 67 |
January in Richardson averages a daily high of 13.1°C with nights around 1.7°C. Expect roughly 7.8 wet days totalling 70.5mm. Generally workable, with some weather to plan around.
February in Richardson averages a daily high of 15.4°C with nights around 3.8°C. Expect roughly 8.4 wet days totalling 85.7mm. Generally workable, with some weather to plan around.
March in Richardson averages a daily high of 20.7°C with nights around 9.1°C. Expect roughly 9 wet days totalling 100mm. Comfortable conditions for being outdoors all day.
April in Richardson averages a daily high of 24.2°C with nights around 12.8°C. Expect roughly 7.6 wet days totalling 92.9mm. Comfortable conditions for being outdoors all day.
May in Richardson averages a daily high of 28.2°C with nights around 17.8°C. Expect roughly 9.7 wet days totalling 137.7mm. Comfortable conditions for being outdoors all day.
June in Richardson averages a daily high of 32.9°C with nights around 22.6°C. Expect roughly 6.7 wet days totalling 98.4mm. Generally workable, with some weather to plan around.
July in Richardson averages a daily high of 34.9°C with nights around 24.3°C. Expect roughly 5.1 wet days totalling 54.3mm. Generally workable, with some weather to plan around.
August in Richardson averages a daily high of 35.4°C with nights around 24.5°C. Expect roughly 5.2 wet days totalling 59.2mm. Generally workable, with some weather to plan around.
September in Richardson averages a daily high of 31.3°C with nights around 20.3°C. Expect roughly 6.1 wet days totalling 82.6mm. Generally workable, with some weather to plan around.
October in Richardson averages a daily high of 25.8°C with nights around 13.8°C. Expect roughly 7.6 wet days totalling 125.9mm. Comfortable conditions for being outdoors all day.
November in Richardson averages a daily high of 19.4°C with nights around 7.9°C. Expect roughly 7 wet days totalling 75.7mm. Comfortable conditions for being outdoors all day.
December in Richardson averages a daily high of 14.8°C with nights around 3.7°C. Expect roughly 8.2 wet days totalling 80.4mm. 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. Richardson peaks at 85.
Based on 30 years of records, March–April scores highest for comfort in Richardson, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 35.4°C.
May is the wettest, averaging 137.7mm of rain across roughly 9.7 wet days.
January is the coolest month, with average daily highs around 13.1°C.