Guilford climate — normals and trends
Guilford (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 1,216 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 (22.2 °C on average) and the coldest is January (-0.2 °C). Rainfall peaks in December.
Guilford averages 66 frost days, 1 hot days (≥ 30 °C) and 119 rainy days per year.
Guilford has warmed by +1.5 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The number of frost days there went from about 76 to 56 per year over the period.
The hottest day of the period reached 32.8 °C (on 6 July 2010) and the coldest -19.5 °C (on 14 February 2016).
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
GuilfordConnecticut
- coords
- 41.29°, -72.68°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.9°C
Average daily high
13.6°C
Average daily low
8.5°C
Annual rainfall
1,216mm
Sunshine / day
9.0h
Mean relative humidity
73%
Average peak wind
25.3km/h
Seasonal range
22.4°C
Frost days (< 0 °C)
66 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
119 d/yr
Annual snowfall
66.4 cm
Average feels-like high
11.4 °C
Average feels-like low
5.0 °C
Average peak gust
39.8 km/h
Tropical nights (≥ 20 °C)
39 d/yr
Solar radiation
14.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.5 °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
32.8 °C
6 July 2010
Coldest day
-19.5 °C
14 February 2016
Wettest day
165 mm
14 October 2005
Windiest day
78.7 km/h
25 November 1950
Strongest gust
147.6 km/h
27 September 1985
Hottest feels-like
36.6 °C
6 August 2018
Coldest feels-like
-28.3 °C
14 February 2016
Snowiest day
32.5 cm
16 February 1958
Sunniest day
14.5 h
17 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 | 1.5 °C | -1.0 °C | 42 mm | -61 mm |
| Feb | 2.7 °C | -0.1 °C | 100 mm | +5 mm |
| Mar | 8.3 °C | +2.4 °C | 127 mm | +10 mm |
| Apr | 12.0 °C | +1.2 °C | 102 mm | -6 mm |
| May | 16.1 °C | +0.2 °C | 194 mm | +93 mm |
| Jun | 22.1 °C | +0.9 °C | 51 mm | -32 mm |
| Jul | 26.3 °C | +1.5 °C | 81 mm | +1 mm |
| Aug | 24.5 °C | 0.0 °C | 52 mm | -45 mm |
| Sep | 22.5 °C | +1.0 °C | 61 mm | -36 mm |
| Oct | 16.8 °C | +0.4 °C | 135 mm | +29 mm |
| Nov | 10.7 °C | -0.2 °C | 61 mm | -51 mm |
| Dec | 4.0 °C | -1.4 °C | 82 mm | -38 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 Guilford?
Guilford has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.9 °C and it receives 1,216 mm of precipitation per year.
What is the hottest day ever recorded in Guilford?
The hottest day measured in Guilford between 1940 and 2025 was 6 July 2010, reaching 32.8 °C.
What is the coldest day in Guilford?
The coldest day measured in Guilford between 1940 and 2025 was 14 February 2016, at -19.5 °C.
Does it snow in Guilford?
Yes. Guilford gets on average 66.4 cm of snow per year and has around 66 frost days.
Has the climate of Guilford warmed?
Yes: Guilford warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Guilford?
The wettest day measured in Guilford between 1940 and 2025 was 14 October 2005, with 165 mm of rain in 24 hours.
What was the windiest day in Guilford?
The windiest day measured in Guilford between 1940 and 2025 was 25 November 1950, with winds reaching 78.7 km/h.
What is the warmest month in Guilford?
The warmest month in Guilford is July (22.2 °C on average); the coldest is January (-0.2 °C).
How much does it rain in Guilford?
Guilford receives on average 1,216 mm of precipitation per year, spread over about 119 rainy days.
Is it sunny in Guilford?
Guilford gets on average 9.0 hours of sunshine per day, roughly 3,285 hours per year over 1940-2025.
What is the biggest single-day snowfall in Guilford?
The heaviest 24-hour snowfall measured in Guilford between 1940 and 2025 was 16 February 1958, with 32.5 cm.
Are there tropical nights in Guilford?
Yes: Guilford has on average 39 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Guilford?
In Guilford, between 1940 and 2025, the highest apparent temperature reached 36.6 °C on 6 August 2018, and the lowest was -28.3 °C on 14 February 2016.
Compare Guilford with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Guilford