Morro Bay weather in December: Morro Bay, California: normal highs, lows, rain and records for December
Morro Bay in December has a normal high of 65°F and a normal low of 46°F, a daily mean of 55°F, falling from 66°F on the 1st to 64°F by the 31st. Measurable precipitation falls on 7 days in a normal December, 2.75 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 18°C and low of 8°C, 70 mm of precipitation in December.
- NOAA stationMorro Bay Fire Dept
- Station IDUSC00045866
- Location35.37°N 120.84°W
- Elevation118 ft (36 m)
- Population10,591
- Jan 65° 46°
- Feb 65° 48°
- Mar 66° 49°
- Apr 67° 49°
- May 67° 52°
- Jun 66° 54°
- Jul 67° 57°
- Aug 70° 57°
- Sep 72° 56°
- Oct 73° 54°
- Nov 69° 50°
- Dec 65° 46°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Morro Bay in December?
The normal high is 65°F and the normal low 46°F, for a daily mean of 55.4°F. December is 4.3°F cooler than November and 0.3°F cooler than January. December is the 12th warmest month of the year in Morro Bay and the 4th wettest. Across the month the normal high falls 2°F, from 66°F on December 1 to 64°F on December 31. From one year to the next December's mean temperature typically moves about 1.4°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 54°F and 57°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 23%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 66°F | 48°F | 18% | 12% |
| December 8 | 65°F | 47°F | 20% | 14% |
| December 15 | 64°F | 46°F | 21% | 16% |
| December 22 | 64°F | 46°F | 22% | 17% |
| December 31 | 64°F | 46°F | 23% | 18% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 25)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 66°F | 48°F | 18% | 12% | 10 h |
| December 2 | 66°F | 47°F | 18% | 13% | 10 h |
| December 3 | 66°F | 47°F | 18% | 13% | 10 h |
| December 4 | 66°F | 47°F | 19% | 13% | 9 h 50 min |
| December 5 | 65°F | 47°F | 19% | 13% | 9 h 50 min |
| December 6 | 65°F | 47°F | 19% | 14% | 9 h 50 min |
| December 7 | 65°F | 47°F | 19% | 14% | 9 h 50 min |
| December 8 | 65°F | 47°F | 20% | 14% | 9 h 50 min |
| December 9 | 65°F | 47°F | 20% | 14% | 9 h 50 min |
| December 10 | 65°F | 46°F | 20% | 15% | 9 h 50 min |
| December 11 | 65°F | 46°F | 20% | 15% | 9 h 50 min |
| December 12 | 65°F | 46°F | 21% | 15% | 9 h 50 min |
| December 13 | 65°F | 46°F | 21% | 15% | 9 h 50 min |
| December 14 | 64°F | 46°F | 21% | 15% | 9 h 50 min |
| December 15 | 64°F | 46°F | 21% | 16% | 9 h 50 min |
| December 16 | 64°F | 46°F | 21% | 16% | 9 h 50 min |
| December 17 | 64°F | 46°F | 21% | 16% | 9 h 50 min |
| December 18 | 64°F | 46°F | 22% | 16% | 9 h 50 min |
| December 19 | 64°F | 46°F | 22% | 16% | 9 h 50 min |
| December 20 | 64°F | 46°F | 22% | 16% | 9 h 50 min |
| December 21 | 64°F | 46°F | 22% | 17% | 9 h 50 min |
| December 22 | 64°F | 46°F | 22% | 17% | 9 h 50 min |
| December 23 | 64°F | 46°F | 22% | 17% | 9 h 50 min |
| December 24 | 64°F | 46°F | 22% | 17% | 9 h 50 min |
| December 25 | 64°F | 46°F | 22% | 17% | 9 h 50 min |
| December 26 | 64°F | 46°F | 22% | 17% | 9 h 50 min |
| December 27 | 64°F | 46°F | 22% | 17% | 9 h 50 min |
| December 28 | 64°F | 46°F | 22% | 17% | 9 h 50 min |
| December 29 | 64°F | 46°F | 22% | 17% | 9 h 50 min |
| December 30 | 64°F | 46°F | 22% | 17% | 9 h 50 min |
| December 31 | 64°F | 46°F | 23% | 18% | 9 h 50 min |
- Normal high
- 65°FDecember average
- Normal low
- 46°FDecember average
- Precipitation
- 2.75 inmonth total
- Days with precipitation
- 70.01 inch or more
- Nights at 32°F or colder
- 1
- Daylight
- 10 h to 9 h 50 minDecember 1 to December 31
- Days at 70°F or more
- 3
- Sunshine
- 80%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00045866; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Morro Bay in December?
On a given December day the chance of 0.01 inch or more is 21% on average, highest around December 31 (23%). In all, 2.75 in falls on 7 days of a normal December, 1 of them with an inch or more.
In a normal December in Morro Bay, 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00045866.
What are the records for December in Morro Bay?
The warmest December temperature on this station's record (since 1959) is 81°F, on December 30, 1980; the coldest is 22°F, on December 22, 1990. The wettest December brought 10.56 in (2010).
Source: records: ACIS, station USC00045866. Records and recent months use complete months only.
How does December in Morro Bay compare across California?
Across the 219 places PlainClimate covers in California, December normal highs run from 38°F in Tahoma to 71°F in Anaheim; Morro Bay's is 65°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Morro Bay in November69°F by day, 50°F at night
- Morro Bay in January65°F by day, 46°F at night
- Morro Bay through the yearEvery month, frost dates, records and recent years
- California in DecemberThe statewide normal and the warmest and coolest places
- Anaheim: California's warmest Decembernormal high 71°F