Glendora in Winter
In winter (December, January and February), Glendora sees average daytime highs around 58°F and overnight lows near 41°F, with 9.9 in of precipitation over about 18 wet days across the season. It is the coldest season of the year and the wettest season of the year.
Across winter, daytime highs hold fairly steady around 58°F. The sky is clear or mostly clear about 47% of the time across winter, and the air most often feels dry.
Winter is Glendora's weakest season of the year to visit on our travel score. For the whole year in context, see Glendora's year-round climate.
- Avg daytime high
- 58°F
- coldest season of the year
- Avg overnight low
- 41°F
- Precipitation
- 9.9 in
- 18 wet days
- Avg wind
- 4 mph
- Travel score
- 4.7
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Glendora in Winter
Across winter, daytime highs hold fairly steady around 58°F.
A typical winter day in Glendora reaches about 58°F and drops to 41°F overnight. The warmest of the three months is February, the coolest December.
Glendora weather by month
How the three winter months (December, January and February) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 58° / 41° | 3.6 | 6 | 1.6 | 10 | 4.7 |
| Feb | 58° / 42° | 3.9 | 7 | 2.1 | 10.7 | 4.7 |
| Mar | 62° / 44° | 2.4 | 6.9 | 1.2 | 11.7 | 5.9 |
| Apr | 67° / 47° | 1.1 | 4.3 | 0.6 | 12.8 | 7.3 |
| May | 73° / 52° | 0.5 | 3.3 | 0 | 13.8 | 8.3 |
| Jun | 80° / 58° | 0.2 | 0.9 | 0 | 14.2 | 8.6 |
| Jul | 86° / 63° | 0.4 | 2.6 | 0 | 14 | 6.6 |
| Aug | 87° / 64° | 0.3 | 2.3 | 0 | 13.3 | 6.2 |
| Sep | 83° / 61° | 0.3 | 2 | 0 | 12.2 | 7.8 |
| Oct | 74° / 54° | 0.8 | 2.7 | 0 | 11.1 | 8.7 |
| Nov | 65° / 47° | 0.9 | 3 | 0.4 | 10.2 | 7.2 |
| Dec | 57° / 41° | 2.4 | 5.3 | 0.9 | 9.8 | 4.7 |
Cloud cover in Winter
The sky is clear or mostly clear about 47% of the time across winter.
Chance of precipitation in Winter
Glendora gets around 9.9 in of rain and snow over 18 wet days across winter. The line is the day-by-day chance of measurable precipitation.
Humidity in Winter
Most of winter feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Winter
Winds average 4 mph across winter.
Sunrise & sunset in Winter
Daylight runs from about 9 h 54 min in early December to 11 h 12 min by late February. The lit band spans sunrise to sunset each day.
Solar energy in Winter
Average shortwave solar energy reaching the ground each day across winter, about 3.4 kWh/m².
Is winter a good time to visit Glendora?
Our two travel scores rate winter for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
winter is a reasonable time to visit Glendora for sightseeing.
What to pack for Glendora in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, Glendora sees daytime highs around 58°F and nights near 41°F. Worth packing: a warm layer. About 18 days see rain.
Sea temperature near Glendora in Winter
The nearest coast averages about 59°F across winter — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 34 mi away) is warmest in August at about 68°F and coldest in February near 59°F.
It's comfortable for a long swim from Aug 4 to Sep 13 — about 1.3 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 59 | 59 | 59 | 59 | 62 | 65 | 67 | 68 | 68 | 66 | 63 | 60 |
| Comfort | Bracing | Bracing | Bracing | Cool | Cool | Cool | Cool | Refreshing | Refreshing | Cool | Cool | Cool |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 59 | Bracing |
| Feb | 59 | Bracing |
| Mar | 59 | Bracing |
| Apr | 59 | Cool |
| May | 62 | Cool |
| Jun | 65 | Cool |
| Jul | 67 | Cool |
| Aug | 68 | Refreshing |
| Sep | 68 | Refreshing |
| Oct | 66 | Cool |
| Nov | 63 | Cool |
| Dec | 60 | Cool |
UV index in Glendora in Winter
Clear-sky midday UV across winter averages around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Glendora peaks around July 11 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 4 | 5 | 5 | 8 | 8 | 11 | 11 | 10 | 8 | 6 | 3 | 3 |
| Level | Moderate | Moderate | Moderate | Very high | Very high | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 4 | Moderate |
| Feb | 5 | Moderate |
| Mar | 5 | Moderate |
| Apr | 8 | Very high |
| May | 8 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 10 | Extreme |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 3 | Moderate |
| Dec | 3 | Moderate |
Air quality in Glendora in Winter
Average fine-particle pollution (PM2.5) through the year — so you can see where winter falls, not just the annual average.
Air quality in Glendora is worst in September — around 39 µg/m³ PM2.5 (poor), about 3.2× the cleanest month (May, 12 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 14 | 15 | 16 | 14 | 12 | 15 | 18 | 22 | 39 | 15 | 17 | 14 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Poor | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 14 | Moderate |
| Feb | 15 | Moderate |
| Mar | 16 | Moderate |
| Apr | 14 | Moderate |
| May | 12 | Moderate |
| Jun | 15 | Moderate |
| Jul | 18 | Moderate |
| Aug | 22 | Moderate |
| Sep | 39 | Poor |
| Oct | 15 | Moderate |
| Nov | 17 | Moderate |
| Dec | 14 | Moderate |
Where is Glendora?
Glendora sits at 34.1°N, 117.9°W, 774 ft above sea level, in United States. The nearest listed city is Azusa, 2.5 mi away.
Topography around Glendora
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Glendora.
Within 2 miles, the terrain around Glendora has large variations in elevation — a maximum elevation change of 2,031 ft around an average of 938 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 5,164 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 10,013 ft.
The land around Glendora is covered by artificial surfaces (61%) and trees (20%) within 2 miles, artificial surfaces (41%), shrubs (28%) and trees (23%) within 10 miles, and artificial surfaces (26%) and grassland (20%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Glendora (34.1361°, -117.8653°, elevation 774 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.