Siwei climate — normals and trends
Siwei (China) has a hot-summer humid continental, dry winter climate (Dwa) under the Köppen-Geiger classification. Its mean annual temperature is 12.5 °C and it receives 747 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 (26.0 °C on average) and the coldest is January (-3.1 °C). Rainfall peaks in July.
Siwei averages 115 frost days, 56 hot days (≥ 30 °C) and 80 rainy days per year.
Siwei has warmed by +2.0 °C between 1940 and 2025, or +0.24 °C per decade. This trend is statistically significant.
The number of frost days there went from about 126 to 104 per year over the period.
The hottest day of the period reached 42.2 °C (on 5 July 1942) and the coldest -25.3 °C (on 13 January 1951).
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
SiweiHebei
- coords
- 38.02°, 114.15°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.5°C
Average daily high
17.9°C
Average daily low
7.5°C
Annual rainfall
747mm
Sunshine / day
9.2h
Mean relative humidity
61%
Average peak wind
12.3km/h
Seasonal range
29.1°C
Frost days (< 0 °C)
115 d/yr
Hot days (≥ 30 °C)
56 d/yr
Rainy days (≥ 1 mm)
80 d/yr
Annual snowfall
23.0 cm
Average feels-like high
16.8 °C
Average feels-like low
5.8 °C
Average peak gust
28.4 km/h
Tropical nights (≥ 20 °C)
57 d/yr
Solar radiation
15.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.39 · 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
42.2 °C
5 July 1942
Coldest day
-25.3 °C
13 January 1951
Wettest day
175 mm
7 August 1963
Windiest day
42.2 km/h
20 March 2010
Strongest gust
88.2 km/h
2 May 1982
Hottest feels-like
45.8 °C
23 July 2024
Coldest feels-like
-30.6 °C
13 January 1951
Snowiest day
15.3 cm
9 April 1957
Sunniest day
14.4 h
1 July 1948
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 | 5.1 °C | +2.8 °C | 3 mm | -1 mm |
| Feb | 6.5 °C | +1.1 °C | 1 mm | -10 mm |
| Mar | 15.7 °C | +3.2 °C | 24 mm | +7 mm |
| Apr | 24.5 °C | +4.0 °C | 13 mm | -22 mm |
| May | 27.1 °C | +0.6 °C | 50 mm | -6 mm |
| Jun | 32.2 °C | +1.7 °C | 75 mm | -8 mm |
| Jul | 32.4 °C | +2.1 °C | 92 mm | -112 mm |
| Aug | 30.2 °C | +1.8 °C | 206 mm | +13 mm |
| Sep | 26.6 °C | +1.7 °C | 29 mm | -51 mm |
| Oct | 16.0 °C | -3.0 °C | 129 mm | +90 mm |
| Nov | 14.8 °C | +4.0 °C | 17 mm | -4 mm |
| Dec | 5.8 °C | +2.0 °C | 6 mm | -0 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 Siwei?
Siwei has a hot-summer humid continental, dry winter climate (Köppen Dwa). Over 1940-2025, the average annual temperature is 12.5 °C and it receives 747 mm of precipitation per year.
What is the hottest day ever recorded in Siwei?
The hottest day measured in Siwei between 1940 and 2025 was 5 July 1942, reaching 42.2 °C.
What is the coldest day in Siwei?
The coldest day measured in Siwei between 1940 and 2025 was 13 January 1951, at -25.3 °C.
Does it snow in Siwei?
Yes. Siwei gets on average 23.0 cm of snow per year and has around 115 frost days.
Has the climate of Siwei warmed?
Yes: Siwei warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Siwei?
The wettest day measured in Siwei between 1940 and 2025 was 7 August 1963, with 175 mm of rain in 24 hours.
What was the windiest day in Siwei?
The windiest day measured in Siwei between 1940 and 2025 was 20 March 2010, with winds reaching 42.2 km/h.
What is the warmest month in Siwei?
The warmest month in Siwei is July (26.0 °C on average); the coldest is January (-3.1 °C).
How much does it rain in Siwei?
Siwei receives on average 747 mm of precipitation per year, spread over about 80 rainy days.
Is it sunny in Siwei?
Siwei gets on average 9.2 hours of sunshine per day, roughly 3,358 hours per year over 1940-2025.
What is the biggest single-day snowfall in Siwei?
The heaviest 24-hour snowfall measured in Siwei between 1940 and 2025 was 9 April 1957, with 15.3 cm.
Are there tropical nights in Siwei?
Yes: Siwei has on average 57 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Siwei?
In Siwei, between 1940 and 2025, the highest apparent temperature reached 45.8 °C on 23 July 2024, and the lowest was -30.6 °C on 13 January 1951.
Compare Siwei with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Siwei