Frankfort climate — normals and trends
Frankfort (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.9 °C and it receives 1,001 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 (23.4 °C on average) and the coldest is January (-3.3 °C). Rainfall peaks in May.
Frankfort averages 108 frost days, 27 hot days (≥ 30 °C) and 123 rainy days per year.
Frankfort has warmed by +2.0 °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 121 to 95 per year over the period.
The hottest day of the period reached 39.1 °C (on 25 June 1988) and the coldest -30.3 °C (on 19 January 1994).
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
FrankfortIndiana
- coords
- 40.28°, -86.51°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.9°C
Average daily high
15.8°C
Average daily low
6.3°C
Annual rainfall
1,001mm
Sunshine / day
8.7h
Mean relative humidity
70%
Average peak wind
20.5km/h
Seasonal range
26.7°C
Frost days (< 0 °C)
108 d/yr
Hot days (≥ 30 °C)
27 d/yr
Rainy days (≥ 1 mm)
123 d/yr
Annual snowfall
58.9 cm
Average feels-like high
13.9 °C
Average feels-like low
3.4 °C
Average peak gust
39.2 km/h
Tropical nights (≥ 20 °C)
33 d/yr
Solar radiation
15.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.38 · 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
39.1 °C
25 June 1988
Coldest day
-30.3 °C
19 January 1994
Wettest day
75 mm
11 January 2020
Windiest day
60.3 km/h
26 January 1978
Strongest gust
112.7 km/h
10 November 1998
Hottest feels-like
44.8 °C
14 July 1995
Coldest feels-like
-38.6 °C
20 January 1985
Snowiest day
25.8 cm
2 January 1999
Sunniest day
14.5 h
10 June 2023
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 | -1.3 °C | -2.1 °C | 43 mm | -25 mm |
| Feb | 3.2 °C | +0.1 °C | 40 mm | -24 mm |
| Mar | 14.5 °C | +5.2 °C | 115 mm | +20 mm |
| Apr | 17.6 °C | +1.3 °C | 125 mm | +19 mm |
| May | 21.4 °C | -0.6 °C | 83 mm | -24 mm |
| Jun | 28.6 °C | +1.9 °C | 105 mm | +5 mm |
| Jul | 30.2 °C | +2.0 °C | 120 mm | +33 mm |
| Aug | 27.7 °C | +0.1 °C | 36 mm | -42 mm |
| Sep | 27.4 °C | +2.9 °C | 34 mm | -34 mm |
| Oct | 20.5 °C | +2.4 °C | 40 mm | -32 mm |
| Nov | 10.9 °C | +0.9 °C | 48 mm | -34 mm |
| Dec | 3.3 °C | 0.0 °C | 47 mm | -25 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 Frankfort?
Frankfort has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.9 °C and it receives 1,001 mm of precipitation per year.
What is the hottest day ever recorded in Frankfort?
The hottest day measured in Frankfort between 1940 and 2025 was 25 June 1988, reaching 39.1 °C.
What is the coldest day in Frankfort?
The coldest day measured in Frankfort between 1940 and 2025 was 19 January 1994, at -30.3 °C.
Does it snow in Frankfort?
Yes. Frankfort gets on average 58.9 cm of snow per year and has around 108 frost days.
Has the climate of Frankfort warmed?
Yes: Frankfort warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Frankfort?
The wettest day measured in Frankfort between 1940 and 2025 was 11 January 2020, with 75 mm of rain in 24 hours.
What was the windiest day in Frankfort?
The windiest day measured in Frankfort between 1940 and 2025 was 26 January 1978, with winds reaching 60.3 km/h.
What is the warmest month in Frankfort?
The warmest month in Frankfort is July (23.4 °C on average); the coldest is January (-3.3 °C).
How much does it rain in Frankfort?
Frankfort receives on average 1,001 mm of precipitation per year, spread over about 123 rainy days.
Is it sunny in Frankfort?
Frankfort gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.
What is the biggest single-day snowfall in Frankfort?
The heaviest 24-hour snowfall measured in Frankfort between 1940 and 2025 was 2 January 1999, with 25.8 cm.
Are there tropical nights in Frankfort?
Yes: Frankfort has on average 33 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Frankfort?
In Frankfort, between 1940 and 2025, the highest apparent temperature reached 44.8 °C on 14 July 1995, and the lowest was -38.6 °C on 20 January 1985.
Compare Frankfort with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Frankfort