The climate of Wuhan is temperate, with relatively cold winters, and hot, muggy and rainy summers. Wuhan is the capital of the Hubei Province, and is located in southeastern China, at the confluence of the Han and Yangtze rivers, at a fairly low latitude (at the 30th parallel), but also in a large continental area, and 630 kilometres (390 miles) away from the sea, so the summer heat is intense and annoying, while in winter cold air can stagnate on the ground. Wuhan is a city with a millennial history, but today it is a metropolis, polluted as often happens in the big cities of China.
Here are the average temperatures.
Wuhan - Average temperatures
Min (°C)1471419232625211583
Max (°C)81115222730333228231711
Min (°F)343945576673797770594637
Max (°F)465259728186919082736352

Precipitation is quite abundant, and amounts to 1,315 millimeters (52 inches) per year; we can notice a minimum between autumn and early winter, and a clear maximum between spring and summer, with more than 200 mm (8 in) per month in June and July. Here is the average rainfall.
Wuhan - Average precipitation

Winter, from December to February, is quite cold: the average January temperature is 4.5 °C (42 °F). Being a little further north, and not protected by mountains, the city is a little colder than Nanchang. There may be cold periods, when the temperature remains around freezing even during the day, and snow can fall. Nocturnal frosts are quite frequent, but generally not intense. However, in January 1977 the temperature dropped to as low as -18 °C (-1 °F). At other periods, the temperature becomes mild (around 15 °C or 59 °F). Sunny days are a bit more frequent in December, then they become rarer. At night fog can form.

Spring, from March to May, is initially mild, and becomes gradually warmer and rainier. In May there are already several warm and summer-like days, at least as regards to the temperature.

Summer, from June to September, is decidedly hot and muggy. The distance from the sea and the humidity make the heat annoying, especially in July and August. June and July are the wettest months of the year. On sunny periods it can be very hot, especially in July and August, with peaks around 36/38 °C (97/100 °F), and tropical nights. In the summer Wuhan is traditionally considered as one of the "three furnaces" of China, along with Chongqing and Nanjing.

Autumn, in October and November, is initially mild, and gradually becomes cooler, and then quite cold at night by November. Rainfall is moderate.

Wuhan from the Yellow Crane Tower

The amount of sunshine in Wuhan is not very good; however, it is quite good in July and August, while it is lower from January to March.
Wuhan - Sunshine

Every so often, from June to October, typhoons, the tropical cyclones of Southeast Asia, which most easily affect the coastal areas, can penetrate in the mainland, even though in this area they arrive decidedly weakened because of the distance from the sea.

Wuhan is located about 300 km (185 miles) east of the Three Gorges Dam, built upstream on the Blue River (Yangtze), and completed in 2006.

When to go

It is not easy to find the best time to visit Wuhan. Since the spring is very rainy, you can choose autumn, especially from late September to early November, which is generally mild or pleasantly warm; it must be said that the arrival of the remains of a typhoon can not be excluded.
Those who can stand the heat can also choose the summer period; August is preferable to July because it is less rainy.