Imperial climate — normals and trends
Imperial (Peru) has a hot desert climate (BWh) under the Köppen-Geiger classification. Its mean annual temperature is 18.6 °C and it receives 136 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 February (20.2 °C on average) and the coldest is July (17.0 °C). Rainfall peaks in February.
Imperial averages 0 frost days, 0 hot days (≥ 30 °C) and 34 rainy days per year.
Imperial has warmed by +1.0 °C between 1940 and 2025, or +0.12 °C per decade. This trend is statistically significant.
The hottest day of the period reached 28.8 °C (on 16 February 1998) and the coldest 10.3 °C (on 10 August 1942).
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
ImperialLima region
- coords
- -13.06°, -76.35°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
18.6°C
Average daily high
22.1°C
Average daily low
16.2°C
Annual rainfall
136mm
Sunshine / day
11.1h
Mean relative humidity
75%
Average peak wind
10.7km/h
Seasonal range
3.2°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
34 d/yr
Annual snowfall
0.0 cm
Average feels-like high
23.7 °C
Average feels-like low
17.0 °C
Average peak gust
31.2 km/h
Tropical nights (≥ 20 °C)
3 d/yr
Solar radiation
22.1 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.0 °C
since 1940
+0.1 °C per decade · r² = 0.26 · 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
28.8 °C
16 February 1998
Coldest day
10.3 °C
10 August 1942
Wettest day
99 mm
10 March 1942
Windiest day
15.6 km/h
9 November 2019
Strongest gust
43.9 km/h
4 January 1998
Hottest feels-like
33.7 °C
16 February 1998
Coldest feels-like
9.1 °C
10 August 1942
Sunniest day
12.6 h
23 January 1944
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 | 24.2 °C | +1.1 °C | 14 mm | -16 mm |
| Feb | 24.1 °C | +0.8 °C | 53 mm | +9 mm |
| Mar | 24.3 °C | +0.8 °C | 18 mm | -14 mm |
| Apr | 23.9 °C | +0.8 °C | 10 mm | +1 mm |
| May | 21.9 °C | -0.2 °C | 9 mm | +5 mm |
| Jun | 20.5 °C | -0.4 °C | 0 mm | -3 mm |
| Jul | 20.5 °C | +0.2 °C | 0 mm | -0 mm |
| Aug | 20.6 °C | +0.1 °C | 0 mm | -0 mm |
| Sep | 21.4 °C | +0.3 °C | 2 mm | +1 mm |
| Oct | 22.1 °C | +0.4 °C | 2 mm | -0 mm |
| Nov | 23.4 °C | +1.1 °C | 0 mm | -3 mm |
| Dec | 23.6 °C | +0.7 °C | 2 mm | -6 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 Imperial?
Imperial has a hot desert climate (Köppen BWh). Over 1940-2025, the average annual temperature is 18.6 °C and it receives 136 mm of precipitation per year.
What is the hottest day ever recorded in Imperial?
The hottest day measured in Imperial between 1940 and 2025 was 16 February 1998, reaching 28.8 °C.
What is the coldest day in Imperial?
The coldest day measured in Imperial between 1940 and 2025 was 10 August 1942, at 10.3 °C.
Does it snow in Imperial?
Almost never: Imperial sees virtually no snow, with about 0 frost days per year.
Has the climate of Imperial warmed?
Yes: Imperial warmed by +1.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Imperial?
The wettest day measured in Imperial between 1940 and 2025 was 10 March 1942, with 99 mm of rain in 24 hours.
What was the windiest day in Imperial?
The windiest day measured in Imperial between 1940 and 2025 was 9 November 2019, with winds reaching 15.6 km/h.
What is the warmest month in Imperial?
The warmest month in Imperial is February (20.2 °C on average); the coldest is July (17.0 °C).
How much does it rain in Imperial?
Imperial receives on average 136 mm of precipitation per year, spread over about 34 rainy days.
Is it sunny in Imperial?
Imperial gets on average 11.1 hours of sunshine per day, roughly 4,052 hours per year over 1940-2025.
Are there tropical nights in Imperial?
Yes: Imperial has on average 3 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Imperial?
In Imperial, between 1940 and 2025, the highest apparent temperature reached 33.7 °C on 16 February 1998, and the lowest was 9.1 °C on 10 August 1942.
Compare Imperial with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Imperial