Glendora climate — normals and trends
Glendora (United States) has a hot-summer mediterranean climate (Csa) under the Köppen-Geiger classification. Its mean annual temperature is 15.1 °C and it receives 439 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 (23.2 °C on average) and the coldest is January (8.1 °C). Rainfall peaks in February.
Glendora averages 9 frost days, 54 hot days (≥ 30 °C) and 47 rainy days per year.
Glendora has warmed by +2.3 °C between 1940 and 2025, or +0.27 °C per decade. This trend is statistically significant.
The number of frost days there went from about 17 to 1 per year over the period.
The hottest day of the period reached 41.9 °C (on 6 September 2020) and the coldest -7.7 °C (on 4 January 1949).
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
GlendoraCalifornia
- coords
- 34.14°, -117.87°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.1°C
Average daily high
21.2°C
Average daily low
10.1°C
Annual rainfall
439mm
Sunshine / day
11.3h
Mean relative humidity
54%
Average peak wind
10.9km/h
Seasonal range
15.1°C
Frost days (< 0 °C)
9 d/yr
Hot days (≥ 30 °C)
54 d/yr
Rainy days (≥ 1 mm)
47 d/yr
Annual snowfall
23.4 cm
Average feels-like high
20.0 °C
Average feels-like low
8.0 °C
Average peak gust
34.9 km/h
Tropical nights (≥ 20 °C)
13 d/yr
Solar radiation
20.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.3 °C
since 1940
+0.3 °C per decade · r² = 0.57 · 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
41.9 °C
6 September 2020
Coldest day
-7.7 °C
4 January 1949
Wettest day
120 mm
1 March 1983
Windiest day
32.3 km/h
16 March 1964
Strongest gust
96.1 km/h
1 March 1983
Hottest feels-like
41.7 °C
6 September 2020
Coldest feels-like
-13.0 °C
4 January 1949
Snowiest day
23.7 cm
4 January 1974
Sunniest day
14.0 h
8 June 1940
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 14.9 °C | +1.5 °C | 21 mm | -64 mm |
| Feb | 17.4 °C | +3.2 °C | 99 mm | +10 mm |
| Mar | 15.6 °C | -0.2 °C | 81 mm | +11 mm |
| Apr | 18.9 °C | +0.1 °C | 20 mm | -12 mm |
| May | 23.3 °C | +1.1 °C | 16 mm | +3 mm |
| Jun | 27.9 °C | +1.3 °C | 3 mm | -0 mm |
| Jul | 29.3 °C | -1.0 °C | 2 mm | -6 mm |
| Aug | 31.1 °C | +0.9 °C | 11 mm | +1 mm |
| Sep | 27.4 °C | -0.6 °C | 27 mm | +16 mm |
| Oct | 23.3 °C | +0.1 °C | 51 mm | +33 mm |
| Nov | 19.2 °C | +1.4 °C | 120 mm | +82 mm |
| Dec | 18.3 °C | +4.3 °C | 125 mm | +61 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 Glendora?
Glendora has a hot-summer mediterranean climate (Köppen Csa). Over 1940-2025, the average annual temperature is 15.1 °C and it receives 439 mm of precipitation per year.
What is the hottest day ever recorded in Glendora?
The hottest day measured in Glendora between 1940 and 2025 was 6 September 2020, reaching 41.9 °C.
What is the coldest day in Glendora?
The coldest day measured in Glendora between 1940 and 2025 was 4 January 1949, at -7.7 °C.
Does it snow in Glendora?
Yes. Glendora gets on average 23.4 cm of snow per year and has around 9 frost days.
Has the climate of Glendora warmed?
Yes: Glendora warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Glendora?
The wettest day measured in Glendora between 1940 and 2025 was 1 March 1983, with 120 mm of rain in 24 hours.
What was the windiest day in Glendora?
The windiest day measured in Glendora between 1940 and 2025 was 16 March 1964, with winds reaching 32.3 km/h.
What is the warmest month in Glendora?
The warmest month in Glendora is July (23.2 °C on average); the coldest is January (8.1 °C).
How much does it rain in Glendora?
Glendora receives on average 439 mm of precipitation per year, spread over about 47 rainy days.
Is it sunny in Glendora?
Glendora gets on average 11.3 hours of sunshine per day, roughly 4,125 hours per year over 1940-2025.
What is the biggest single-day snowfall in Glendora?
The heaviest 24-hour snowfall measured in Glendora between 1940 and 2025 was 4 January 1974, with 23.7 cm.
Are there tropical nights in Glendora?
Yes: Glendora has on average 13 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Glendora?
In Glendora, between 1940 and 2025, the highest apparent temperature reached 41.7 °C on 6 September 2020, and the lowest was -13.0 °C on 4 January 1949.
Compare Glendora with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Glendora