Newton climate — normals and trends
Newton (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 9.5 °C and it receives 940 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 (23.6 °C on average) and the coldest is January (-6.9 °C). Rainfall peaks in May.
Newton averages 129 frost days, 30 hot days (≥ 30 °C) and 106 rainy days per year.
Newton has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The number of frost days there went from about 138 to 120 per year over the period.
The hottest day of the period reached 38.8 °C (on 17 August 1988) and the coldest -34.1 °C (on 3 February 1996).
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
NewtonIowa
- coords
- 41.70°, -93.05°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.5°C
Average daily high
14.5°C
Average daily low
4.6°C
Annual rainfall
940mm
Sunshine / day
8.9h
Mean relative humidity
70%
Average peak wind
21.8km/h
Seasonal range
30.5°C
Frost days (< 0 °C)
129 d/yr
Hot days (≥ 30 °C)
30 d/yr
Rainy days (≥ 1 mm)
106 d/yr
Annual snowfall
67.2 cm
Average feels-like high
12.3 °C
Average feels-like low
1.4 °C
Average peak gust
39.9 km/h
Tropical nights (≥ 20 °C)
28 d/yr
Solar radiation
15.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.28 · 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
38.8 °C
17 August 1988
Coldest day
-34.1 °C
3 February 1996
Wettest day
101 mm
21 July 1961
Windiest day
78.8 km/h
9 April 1973
Strongest gust
113.4 km/h
5 May 1950
Hottest feels-like
46.1 °C
6 July 1948
Coldest feels-like
-40.8 °C
3 February 1996
Snowiest day
33.9 cm
9 April 1973
Sunniest day
14.8 h
24 June 1940
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 | -0.7 °C | +1.8 °C | 12 mm | -21 mm |
| Feb | -0.5 °C | -0.6 °C | 12 mm | -24 mm |
| Mar | 14.2 °C | +6.9 °C | 97 mm | +24 mm |
| Apr | 16.6 °C | +1.2 °C | 111 mm | +6 mm |
| May | 22.4 °C | +0.9 °C | 60 mm | -66 mm |
| Jun | 28.9 °C | +2.3 °C | 116 mm | -3 mm |
| Jul | 28.9 °C | +0.4 °C | 234 mm | +137 mm |
| Aug | 26.9 °C | -0.6 °C | 52 mm | -47 mm |
| Sep | 26.5 °C | +2.8 °C | 58 mm | -32 mm |
| Oct | 20.1 °C | +2.8 °C | 65 mm | -5 mm |
| Nov | 9.9 °C | +1.7 °C | 48 mm | -6 mm |
| Dec | 0.9 °C | +0.3 °C | 27 mm | -11 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 Newton?
Newton has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 9.5 °C and it receives 940 mm of precipitation per year.
What is the hottest day ever recorded in Newton?
The hottest day measured in Newton between 1940 and 2025 was 17 August 1988, reaching 38.8 °C.
What is the coldest day in Newton?
The coldest day measured in Newton between 1940 and 2025 was 3 February 1996, at -34.1 °C.
Does it snow in Newton?
Yes. Newton gets on average 67.2 cm of snow per year and has around 129 frost days.
Has the climate of Newton warmed?
Yes: Newton warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Newton?
The wettest day measured in Newton between 1940 and 2025 was 21 July 1961, with 101 mm of rain in 24 hours.
What was the windiest day in Newton?
The windiest day measured in Newton between 1940 and 2025 was 9 April 1973, with winds reaching 78.8 km/h.
What is the warmest month in Newton?
The warmest month in Newton is July (23.6 °C on average); the coldest is January (-6.9 °C).
How much does it rain in Newton?
Newton receives on average 940 mm of precipitation per year, spread over about 106 rainy days.
Is it sunny in Newton?
Newton gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.
What is the biggest single-day snowfall in Newton?
The heaviest 24-hour snowfall measured in Newton between 1940 and 2025 was 9 April 1973, with 33.9 cm.
Are there tropical nights in Newton?
Yes: Newton has on average 28 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Newton?
In Newton, between 1940 and 2025, the highest apparent temperature reached 46.1 °C on 6 July 1948, and the lowest was -40.8 °C on 3 February 1996.
Compare Newton with another city
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Nearby cities
The climate around Newton