Sanmenxia climate — normals and trends
Sanmenxia (China) has a hot-summer humid continental, dry winter climate (Dwa) under the Köppen-Geiger classification. Its mean annual temperature is 12.3 °C and it receives 805 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (25.0 °C on average) and the coldest is January (-2.2 °C). Rainfall peaks in July.
Sanmenxia averages 102 frost days, 43 hot days (≥ 30 °C) and 94 rainy days per year.
Sanmenxia has warmed by +1.9 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The number of frost days there went from about 113 to 91 per year over the period.
The hottest day of the period reached 40.4 °C (on 1 August 1969) and the coldest -23.5 °C (on 15 January 1958).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
SanmenxiaHenan
- coords
- 34.78°, 111.19°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.3°C
Average daily high
17.2°C
Average daily low
8.0°C
Annual rainfall
805mm
Sunshine / day
8.3h
Mean relative humidity
69%
Average peak wind
14.3km/h
Seasonal range
27.2°C
Frost days (< 0 °C)
102 d/yr
Hot days (≥ 30 °C)
43 d/yr
Rainy days (≥ 1 mm)
94 d/yr
Annual snowfall
38.3 cm
Average feels-like high
16.0 °C
Average feels-like low
6.4 °C
Average peak gust
33.5 km/h
Tropical nights (≥ 20 °C)
49 d/yr
Solar radiation
15.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.40 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
40.4 °C
1 August 1969
Coldest day
-23.5 °C
15 January 1958
Wettest day
148 mm
9 August 1999
Windiest day
42.5 km/h
2 June 1946
Strongest gust
100.1 km/h
26 April 2010
Hottest feels-like
43.7 °C
12 July 1959
Coldest feels-like
-29.4 °C
15 January 1958
Snowiest day
15.2 cm
13 January 1957
Sunniest day
14.0 h
23 June 1941
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 4.9 °C | +2.4 °C | 31 mm | +19 mm |
| Feb | 6.6 °C | +1.0 °C | 4 mm | -16 mm |
| Mar | 14.6 °C | +2.3 °C | 37 mm | +2 mm |
| Apr | 24.3 °C | +5.0 °C | 9 mm | -42 mm |
| May | 27.4 °C | +3.1 °C | 19 mm | -52 mm |
| Jun | 30.3 °C | +1.4 °C | 61 mm | -20 mm |
| Jul | 33.0 °C | +3.5 °C | 53 mm | -103 mm |
| Aug | 29.8 °C | +1.8 °C | 171 mm | +30 mm |
| Sep | 22.1 °C | -1.2 °C | 272 mm | +151 mm |
| Oct | 14.9 °C | -2.9 °C | 216 mm | +146 mm |
| Nov | 13.2 °C | +2.5 °C | 15 mm | -21 mm |
| Dec | 7.4 °C | +3.2 °C | 14 mm | +2 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Sanmenxia?
Sanmenxia has a hot-summer humid continental, dry winter climate (Köppen Dwa). Over 1940-2025, the average annual temperature is 12.3 °C and it receives 805 mm of precipitation per year.
What is the hottest day ever recorded in Sanmenxia?
The hottest day measured in Sanmenxia between 1940 and 2025 was 1 August 1969, reaching 40.4 °C.
What is the coldest day in Sanmenxia?
The coldest day measured in Sanmenxia between 1940 and 2025 was 15 January 1958, at -23.5 °C.
Does it snow in Sanmenxia?
Yes. Sanmenxia gets on average 38.3 cm of snow per year and has around 102 frost days.
Has the climate of Sanmenxia warmed?
Yes: Sanmenxia warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sanmenxia?
The wettest day measured in Sanmenxia between 1940 and 2025 was 9 August 1999, with 148 mm of rain in 24 hours.
What was the windiest day in Sanmenxia?
The windiest day measured in Sanmenxia between 1940 and 2025 was 2 June 1946, with winds reaching 42.5 km/h.
What is the warmest month in Sanmenxia?
The warmest month in Sanmenxia is July (25.0 °C on average); the coldest is January (-2.2 °C).
How much does it rain in Sanmenxia?
Sanmenxia receives on average 805 mm of precipitation per year, spread over about 94 rainy days.
Is it sunny in Sanmenxia?
Sanmenxia gets on average 8.3 hours of sunshine per day, roughly 3,030 hours per year over 1940-2025.
What is the biggest single-day snowfall in Sanmenxia?
The heaviest 24-hour snowfall measured in Sanmenxia between 1940 and 2025 was 13 January 1957, with 15.2 cm.
Are there tropical nights in Sanmenxia?
Yes: Sanmenxia has on average 49 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sanmenxia?
In Sanmenxia, between 1940 and 2025, the highest apparent temperature reached 43.7 °C on 12 July 1959, and the lowest was -29.4 °C on 15 January 1958.
Compare Sanmenxia with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sanmenxia