Pomona, CA weather in January
In January, Pomona sees highs around 68°F and lows around 45°F: mild, with some rain. Expect about 7 wet days. It is one of the coolest months in Pomona. Good for outdoor plans.
- Normal high
- 68°F
- Normal low
- 45°F
- Wet days
- 7
- 5.2 in total
- Daylight
- 10.2 h
How January changes from start to finish
| January 1 | January 31 | |
|---|---|---|
| Normal high | 67°F | 68°F |
| Normal low | 44°F | 45°F |
| Chance of a wet day | 22% | 24% |
| Sunrise / sunset | 6:56 am / 4:52 pm | 6:48 am / 5:20 pm |
| Daylight | 9.9 h | 10.5 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
A typical January day
- 6 am48°Fdew point 35°F
- 9 am54°Fdew point 36°F
- Noon64°Fdew point 34°F
- 3 pm66°Fdew point 35°F
- 6 pm60°Fdew point 38°F
- 9 pm55°Fdew point 38°F
NOAA hourly normals (local standard time) from Burbank Glendale Pasadena Airport (36 mi away); average wind 4 mph; clear or few clouds in 74% of daytime hours, mostly cloudy or overcast in 23%.
What kind of days to expect
- Comfortable dayshigh 65-80°F (temperature only: no humidity station nearby)16 of 31
- Hot dayshigh 90°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow7 of 31
- Notable rainat least 0.10 in5 of 31
- Freezing nightslow 32°F or below1 of 31
Average days per January, counted from daily records for each year 1991-2020.
Rain in January
Normal precipitation is 5.2 in; a dry January brings about 1.2 in and a wet one about 7.8 in (25th and 75th percentiles). About 3 days bring half an inch or more, and about 2 an inch or more. Snow is very rare.
How January varies from year to year
- Warmest January, 1991-20202014: average high 76°F
- Coolest January2017: average high 61°F
- Wettest January1993: 20.2 in
- Driest January2003: no measurable precipitation
- Highest reading90°F (January 31, 2003)
- Lowest reading25°F (January 14, 2007)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
January compared with December and February
| December | January | February | |
|---|---|---|---|
| Normal high | 67°F | 68°F | 68°F |
| Normal low | 44°F | 45°F | 46°F |
| Wet days | 6 | 7 | 8 |
| Comfortable days | 15 | 16 | 12 |
| Daylight | 9.9 h | 10.2 h | 11.0 h |
Highs change by +1°F from December and 0°F into February.
Nearby alternatives in January
- Drier: Palm Springs, CA71 mi · high 71°F · 3 wet days
- Cooler: Palmdale, CA42 mi · high 60°F · 5 wet days
How Pomona ranks in January
- Normal high46th warmest of 378 cities; 16th of 60 in California
- Wet days118th driest of 378
Frost in January
The last spring frost typically comes around Jan 8; in 1 year in 10 it comes after Feb 18. All frost dates for Pomona.
Heating and cooling
January has 280 heating degree days and 5 cooling degree days (base 65°F), 9% of the year's total heating and cooling demand.
Questions
How cold is Pomona in January?
The normal high is 68°F and the normal low is 45°F. From 1991 to 2020 the coldest January reading was 25°F (January 14, 2007).
Does it rain a lot in Pomona in January?
About 7 days in January have at least 0.01 in of precipitation, and the normal total is 5.2 in. The wettest January in 1991-2020 was in 1993 (20.2 in); the driest was in 2003, with no measurable precipitation.
Is January a good time to visit Pomona?
January ranks 5th of 12 months on our comfort score for Pomona (65 out of 100). It has about 16 comfortable days (judged by temperature only). The best months are March, April and May.
Where the numbers come from
- Temperature: Ontario Intl Airport (USW00003102), 8.7 mi E of the city center, 949 ft (100 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Rain: San Gabriel Canyon PH (USC00047776), 11 mi NW of the city center, 744 ft (105 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Covina City Yard Fc387b (USC00042090), 7.7 mi WNW of the city center, 607 ft (242 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Frost dates: Pomona/Fairplex (USC00047050), 2.0 mi NNW of the city center, 999 ft (150 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Burbank Glendale Pasadena Airport (USW00023152), 36 mi WNW of the city center, 741 ft (108 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Not available for this location: daily humidity and wind (no station close enough or similar enough in elevation).