Hayward, CA weather in December
In December, Hayward sees highs around 58°F and lows around 45°F: cool, with frequent rain. Rain falls on about 12 days. It is one of the coolest months in Hayward.
- Normal high
- 58°F
- Normal low
- 45°F
- Wet days
- 12
- 5.1 in total
- Muggy days
- 0
- dew point 65°F+
How December changes from start to finish
| December 1 | December 31 | |
|---|---|---|
| Normal high | 60°F | 57°F |
| Normal low | 46°F | 44°F |
| Chance of a wet day | 35% | 36% |
| Sunrise / sunset | 7:04 am / 4:49 pm | 7:23 am / 4:59 pm |
| Daylight | 9.8 h | 9.6 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 December day
- 6 am46°Fdew point 41°F
- 9 am50°Fdew point 43°F
- Noon54°Fdew point 43°F
- 3 pm56°Fdew point 43°F
- 6 pm52°Fdew point 43°F
- 9 pm50°Fdew point 43°F
NOAA hourly normals (local standard time) from Oakland Metro Intl Airport (9 mi away); average wind 7 mph; clear or few clouds in 32% of daytime hours, mostly cloudy or overcast in 54%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F1 of 31
- Hot dayshigh 90°F or more0 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow12 of 31
- Notable rainat least 0.10 in8 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per December, counted from daily records for each year 1991-2020.
Rain in December
Normal precipitation is 5.1 in; a dry December brings about 2.5 in and a wet one about 7.5 in (25th and 75th percentiles). About 4 days bring half an inch or more, and about 1 an inch or more. Snow is very rare.
How December varies from year to year
- Warmest December, 1991-20202014: average high 62°F
- Coolest December1994: average high 53°F
- Wettest December2005: 11.6 in
- Driest December2011: 0.09 in
- Highest reading73°F (December 7, 2020)
- Lowest reading31°F (December 24, 1998)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
December compared with November and January
| November | December | January | |
|---|---|---|---|
| Normal high | 64°F | 58°F | 58°F |
| Normal low | 49°F | 45°F | 45°F |
| Wet days | 8 | 12 | 11 |
| Comfortable days | 11 | 1 | 2 |
| Daylight | 10.2 h | 9.6 h | 9.9 h |
Highs change by -6°F from November and 0°F into January.
Nearby alternatives in December
- Warmer: Santa Maria, CA209 mi · high 64°F · 7 wet days
- Drier: Salinas, CA72 mi · high 62°F · 8 wet days
- Cooler: Yosemite Valley, CA137 mi · high 46°F · 9 wet days
How Hayward ranks in December
- Normal high127th warmest of 378 cities; 39th of 60 in California
- Wet days293rd driest of 378
- Comfortable days190th most of 340
What to pack for Hayward in December
- A rain jacket or umbrella – rain on about 12 days
Heating and cooling
December has 422 heating degree days and 0 cooling degree days (base 65°F), 16% of the year's total heating and cooling demand.
Questions
How cold is Hayward in December?
The normal high is 58°F and the normal low is 45°F. From 1991 to 2020 the coldest December reading was 31°F (most recently on December 24, 1998).
Does it rain a lot in Hayward in December?
About 12 days in December have at least 0.01 in of precipitation, and the normal total is 5.1 in. The wettest December in 1991-2020 was in 2005 (11.6 in); the driest was in 2011 (0.09 in).
Is December a good time to visit Hayward?
December ranks 12th of 12 months on our comfort score for Hayward (42 out of 100). It has about 1 comfortable day. The best months are July and August.
Where the numbers come from
- Temperature and cloud cover: San Francisco Intl Airport (USW00023234), 16 mi WSW of the city center, 8 ft (98 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Rain: Upper San Leandro Filters (USC00049185), 8.6 mi NNW of the city center, 394 ft (288 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Newark (USC00046144), 11 mi SSE of the city center, 10 ft (96 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Frost dates: Hayward Air Terminal (USW00093228), 2.1 mi WSW of the city center, 43 ft (63 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Oakland Metro Intl Airport (USW00023230), 8.5 mi WNW of the city center, 6 ft (100 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: San Francisco International Airport (724940-23234), 16 mi WSW of the city center, 10 ft (96 ft lower than the city). Hourly observations, 1991-2020.