Climate and monthly weather forecast
Sanmenxia, China

Sanmenxia, a city located in Henan Province, China, resides under the umbrella of the Cwa Köppen climate classification, indicating a humid subtropical climate with dry winters. Experiencing a wide range of weather variability throughout the year, the general climate conditions range greatly from cool winters to warm summers.

The highest average monthly temperatures of Sanmenxia occur from May to September, peaking at 31.6°C (88.9°F) in July. In complete contrast, the lowest average temperatures manifest themselves during the peak of winter, falling to -4.1°C (24.6°F) in January. This wide spread of temperatures affirms the climatic diversity experienced in the area.

The rainfall distribution throughout the year presents a clear trend, with increasing amounts from January to July, and decreasing subsequently. The months of July and August bring maximum rainfall, with averages of 113mm (4.45") and 95mm (3.74") respectively. To contrast, the dryer part of the year consists of a below the average rainfall from November to February, with the least rainfall in January at 5mm (0.2").

The presence of daylight hours in Sanmenxia follows the regular trend associated with a subtropical climate, more abundant in the summer months, peaking at 14.5 hours per day in June. Inversely the sun is not as generous in the winter months, with the least daylight hours being 9.9 hours in December.

Taking into account the averaged climate parameters, it can be suggested that the most favorable time to visit Sanmenxia is from late spring to early summer, specifically months of April, May, and June. As these months coincide with warmer climate conditions, averaging high temperatures from 13.5°C (56.3°F) to 30.9°C (87.6°F) and fairly moderate rainfall with daylight hours extending from 13.1 hours in April to 14.5 hours in June. These conditions are ideal for outdoor activity, exploration, and appreciating the subtropical climate without the burden of heavy rainfall.

The harsher climate conditions of Sanmenxia are experienced during late summer and early winter, specifically from July to January. The high temperatures and heavy rainfall from July to September which peak at 31.6°C (88.9°F) and 113mm (4.45"), might discourage outdoor activity. Transitioning into the winter season temperatures decline vastly reaching the coldest conditions in January with an average low temperature of -4.1°C (24.6°F). Unless one is equipped for and fond of colder winters and sparse rainfall, these months may not be ideal for a visit.

Spring in Sanmenxia, encompassing March to May, brings about a significant rise in temperature. The average high temperature progresses from 13.5°C (56.3°F) in March to 26.8°C (80.2°F) in May. Correspondingly the average low temperatures rise from 3.8°C (38.8°F) to 15.2°C (59.4°F) in May. The incidence of rainfall also begins escalating with an increase from 22mm (0.87") in March to 52mm (2.05") in May. Daylight hours extend correspondingly from 12 hours to 14 hours from March to May, providing plenty of opportunity for the enjoyment of outdoor activities and local sightseeing.

Sanmenxia experiences a warm and tropical summer, extending from June to August. High temperatures during this season range around a high of 30.9°C (87.6°F) in June to 30.3°C (86.5°F) in August. Night temperatures also stay fairly warm, averaging from 19.6°C (67.3°F) in June to 21.5°C (70.7°F) in August. However, it is worth noting the heavy rainfall this season brings with it, as the city experiences the maximum rainfall of the year, level reaching a high of 113mm (4.45") in July. Coupled with a generous 14-14.2 daylight hours, summers give a truly tropical experience, given provision is made for the occasional showers.

Autumn in Sanmenxia from September to November ushers in a period of moderation. Although September remains fairly warm with a high of 25.5°C (77.9°F), by November average high temperatures reduce to a cooler 12.5°C (54.5°F). Also, low temperatures register a noticeable decline from 16.3°C (61.3°F) to 3.3°C (37.9°F) over these months. Autumn witnesses a sharp decline in rainfall, reducing from the high summer levels of 84mm (3.31") in September to a moderate 20mm (0.79") by November. Daylight hours also decrease gradually from 12.4 hours in September to 10.4 hours in November.

Winters in Sanmenxia, that span December to February, are generally characterised by cool temperatures and scarce rainfall. High temperatures during winter range from 6.3°C (43.3°F) in December to 4.6°C (40.3°F) in January. The average low temperature reaches its nadir in January at -4.1°C (24.6°F). Rainfall during these months is also at its annual lowest, dwindling from 5mm (0.2") in December to 6mm (0.24") in February. Even daylight hours reduce to their minimum averages falling from 10.1 hours in December to 9.9 in February, confining most activities to indoor environments.

Beginning the year in Sanmenxia, China the weather is chilly but relatively dry. Average high temperatures reach only 4.6°C (40.3°F), while lows can plummet to an average of -4.1°C (24.6°F). This makes it the coldest month of the year. Weather in January »

As winter continues into February, Sanmenxia residents notice a slight uptick in temperature. Despite this increase, the weather remains cold with temperatures generally being lower than March. The daylight hours also increase slightly, hinting at the coming spring. Weather in February »

In March, Sanmenxia begins to transition into spring. As high temperatures climb to an average of 13.5°C (56.3°F), the threat of frost starts to diminish. The noticeable increase in daylight hours influences this warmer shift in the weather. Weather in March »

April showcases a significant leap in warmer conditions in Sanmenxia. Making it a notably warmer month than March with high temperatures soaring above and touching 21.3°C (70.3°F). The extended daylight hours further complement these warmer conditions. Weather in April »

May in Sanmenxia is synonymous with the full bloom of spring. The weather continues to heat up from April, and the city gets considerably wetter. Noteworthy is the increase in the daylight hours that adds to the warmth of the month. Despite the considerable rainfall, the pleasant temperatures make May an excellent time to enjoy outdoor activities. May in Sanmenxia sees a temperature increase, moving from a pleasant 21.3°C (70.3°F) in April to a warm 26.8°C (80.2°F). Weather in May »

June declares the start of summer in Sanmenxia with high temperatures going up to 30.9°C (87.6°F). The city continues to get wetter compared to May, with regular rainfall throughout the month. Correspondingly, the daylight hours reach their peak, contributing to the overall heat. Weather in June »

July is the middle of summer in Sanmenxia, with conditions being even hotter than June. The month also crosses a significant threshold with an average high temperature reaching 31.6°C (88.9°F). However, it is also the wettest month of the year, which may come as a surprise to some. Weather in July »

August shows a slight reprieve from the scorching and wet conditions of July in Sanmenxia. While the rain meters indicate a decline, the temperatures remain relatively high. August retains the characteristics of a regular summer month with long daylight hours. Weather in August »

September marks the transition from summer to autumn in Sanmenxia. The temperatures begin their gradual descent from the summer heat, but they remain comfortably warm. Correspondingly, the daylight hours start to shorten, reflecting the oncoming fall season. Weather in September »

October in Sanmenxia brings about a noticeable shift towards cooler and drier conditions. The weather takes a turn from the trend set by September, cooling down significantly. The shortened daylight hours contribute to the cooling conditions. Weather in October »

November quantifies the advancement of the cool season in Sanmenxia. From a temperature perspective, the weather cools down even further from October. As it transitions deeper into autumn, the daylight hours continue to decrease. Weather in November »

December brings about winter in Sanmenxia, with temperatures dropping drastically from November. Among monthly standouts are low daylight hours echoing the rest of China’s winter season. The precipitation drops significantly, making it one of the driest months of the year. Weather in December »