Sparta climate — normals and trends
Sparta (United States) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.4 °C and it receives 1,137 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 (22.8 °C on average) and the coldest is January (-2.4 °C). Rainfall peaks in May.
Sparta averages 108 frost days, 20 hot days (≥ 30 °C) and 123 rainy days per year.
Sparta 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 38.6 °C (on 22 July 2011) and the coldest -27.2 °C (on 22 January 1984).
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
SpartaNew Jersey
- coords
- 41.03°, -74.64°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.4°C
Average daily high
15.1°C
Average daily low
5.9°C
Annual rainfall
1,137mm
Sunshine / day
8.6h
Mean relative humidity
69%
Average peak wind
15.9km/h
Seasonal range
25.2°C
Frost days (< 0 °C)
108 d/yr
Hot days (≥ 30 °C)
20 d/yr
Rainy days (≥ 1 mm)
123 d/yr
Annual snowfall
89.7 cm
Average feels-like high
13.5 °C
Average feels-like low
3.3 °C
Average peak gust
38.8 km/h
Tropical nights (≥ 20 °C)
20 d/yr
Solar radiation
14.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.46 · 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
38.6 °C
22 July 2011
Coldest day
-27.2 °C
22 January 1984
Wettest day
159 mm
16 September 1999
Windiest day
48.3 km/h
25 November 1950
Strongest gust
138.6 km/h
25 November 1950
Hottest feels-like
43.6 °C
26 August 1948
Coldest feels-like
-32.3 °C
12 January 1981
Snowiest day
32.8 cm
14 March 2017
Sunniest day
14.2 h
24 June 2025
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 | -0.8 °C | 27 mm | -59 mm |
| Feb | 3.5 °C | +0.4 °C | 82 mm | +3 mm |
| Mar | 12.8 °C | +4.7 °C | 99 mm | -2 mm |
| Apr | 16.4 °C | +1.6 °C | 94 mm | -5 mm |
| May | 19.9 °C | -0.5 °C | 183 mm | +78 mm |
| Jun | 26.0 °C | +0.8 °C | 65 mm | -29 mm |
| Jul | 30.1 °C | +2.3 °C | 96 mm | -5 mm |
| Aug | 27.2 °C | +0.4 °C | 34 mm | -65 mm |
| Sep | 25.3 °C | +2.4 °C | 73 mm | -21 mm |
| Oct | 17.7 °C | +0.9 °C | 86 mm | -6 mm |
| Nov | 10.2 °C | +0.1 °C | 52 mm | -39 mm |
| Dec | 2.2 °C | -1.7 °C | 72 mm | -23 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 Sparta?
Sparta has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.4 °C and it receives 1,137 mm of precipitation per year.
What is the hottest day ever recorded in Sparta?
The hottest day measured in Sparta between 1940 and 2025 was 22 July 2011, reaching 38.6 °C.
What is the coldest day in Sparta?
The coldest day measured in Sparta between 1940 and 2025 was 22 January 1984, at -27.2 °C.
Does it snow in Sparta?
Yes. Sparta gets on average 89.7 cm of snow per year and has around 108 frost days.
Has the climate of Sparta warmed?
Yes: Sparta warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sparta?
The wettest day measured in Sparta between 1940 and 2025 was 16 September 1999, with 159 mm of rain in 24 hours.
What was the windiest day in Sparta?
The windiest day measured in Sparta between 1940 and 2025 was 25 November 1950, with winds reaching 48.3 km/h.
What is the warmest month in Sparta?
The warmest month in Sparta is July (22.8 °C on average); the coldest is January (-2.4 °C).
How much does it rain in Sparta?
Sparta receives on average 1,137 mm of precipitation per year, spread over about 123 rainy days.
Is it sunny in Sparta?
Sparta gets on average 8.6 hours of sunshine per day, roughly 3,139 hours per year over 1940-2025.
What is the biggest single-day snowfall in Sparta?
The heaviest 24-hour snowfall measured in Sparta between 1940 and 2025 was 14 March 2017, with 32.8 cm.
Are there tropical nights in Sparta?
Yes: Sparta has on average 20 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sparta?
In Sparta, between 1940 and 2025, the highest apparent temperature reached 43.6 °C on 26 August 1948, and the lowest was -32.3 °C on 12 January 1981.
Compare Sparta with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sparta