Bay City climate — normals and trends
Bay City (United States) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 21.0 °C and it receives 1,036 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 (28.1 °C on average) and the coldest is January (12.2 °C). Rainfall peaks in September.
Bay City averages 6 frost days, 125 hot days (≥ 30 °C) and 125 rainy days per year.
Bay City has warmed by +1.7 °C between 1940 and 2025, or +0.19 °C per decade. This trend is statistically significant.
The hottest day of the period reached 42.5 °C (on 4 September 2000) and the coldest -16.1 °C (on 31 January 1949).
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
Bay CityTexas
- coords
- 28.98°, -95.97°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
21.0°C
Average daily high
25.9°C
Average daily low
16.8°C
Annual rainfall
1,036mm
Sunshine / day
9.6h
Mean relative humidity
75%
Average peak wind
17.8km/h
Seasonal range
15.9°C
Frost days (< 0 °C)
6 d/yr
Hot days (≥ 30 °C)
125 d/yr
Rainy days (≥ 1 mm)
125 d/yr
Annual snowfall
0.6 cm
Average feels-like high
27.5 °C
Average feels-like low
17.3 °C
Average peak gust
37.1 km/h
Tropical nights (≥ 20 °C)
163 d/yr
Solar radiation
17.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.41 · 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
42.5 °C
4 September 2000
Coldest day
-16.1 °C
31 January 1949
Wettest day
234 mm
11 September 1961
Windiest day
70.5 km/h
11 September 1961
Strongest gust
142.2 km/h
11 September 1961
Hottest feels-like
45.5 °C
29 June 2013
Coldest feels-like
-20.6 °C
31 January 1949
Snowiest day
10.4 cm
30 January 1949
Sunniest day
13.2 h
18 June 2021
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 | 15.3 °C | -2.0 °C | 100 mm | +19 mm |
| Feb | 20.6 °C | +1.6 °C | 38 mm | -30 mm |
| Mar | 26.4 °C | +4.0 °C | 76 mm | +4 mm |
| Apr | 28.3 °C | +2.4 °C | 42 mm | -43 mm |
| May | 31.7 °C | +2.5 °C | 89 mm | -10 mm |
| Jun | 32.6 °C | +0.8 °C | 204 mm | +105 mm |
| Jul | 33.9 °C | +1.2 °C | 80 mm | -8 mm |
| Aug | 33.4 °C | +0.4 °C | 163 mm | +70 mm |
| Sep | 32.1 °C | +1.3 °C | 93 mm | -17 mm |
| Oct | 30.9 °C | +3.4 °C | 48 mm | -30 mm |
| Nov | 26.3 °C | +4.0 °C | 47 mm | -40 mm |
| Dec | 21.1 °C | +2.2 °C | 65 mm | -14 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 Bay City?
Bay City has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 21.0 °C and it receives 1,036 mm of precipitation per year.
What is the hottest day ever recorded in Bay City?
The hottest day measured in Bay City between 1940 and 2025 was 4 September 2000, reaching 42.5 °C.
What is the coldest day in Bay City?
The coldest day measured in Bay City between 1940 and 2025 was 31 January 1949, at -16.1 °C.
Does it snow in Bay City?
Almost never: Bay City sees virtually no snow, with about 6 frost days per year.
Has the climate of Bay City warmed?
Yes: Bay City warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Bay City?
The wettest day measured in Bay City between 1940 and 2025 was 11 September 1961, with 234 mm of rain in 24 hours.
What was the windiest day in Bay City?
The windiest day measured in Bay City between 1940 and 2025 was 11 September 1961, with winds reaching 70.5 km/h.
What is the warmest month in Bay City?
The warmest month in Bay City is July (28.1 °C on average); the coldest is January (12.2 °C).
How much does it rain in Bay City?
Bay City receives on average 1,036 mm of precipitation per year, spread over about 125 rainy days.
Is it sunny in Bay City?
Bay City gets on average 9.6 hours of sunshine per day, roughly 3,504 hours per year over 1940-2025.
What is the biggest single-day snowfall in Bay City?
The heaviest 24-hour snowfall measured in Bay City between 1940 and 2025 was 30 January 1949, with 10.4 cm.
Are there tropical nights in Bay City?
Yes: Bay City has on average 163 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Bay City?
In Bay City, between 1940 and 2025, the highest apparent temperature reached 45.5 °C on 29 June 2013, and the lowest was -20.6 °C on 31 January 1949.
Compare Bay City with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Bay City