As of 04:03 PDT

Fullerton, CA weather in December

69°

Fullerton, Sunday, 9 August, 04:03

Clear. Feels like 70°. High 98°, low 69°.

Pressure29.85 inHg

Wind5.5 mph SW

Humidity86%

Visibility6.2 mi

Dew point65°

See detailed hourly forecast

In December, Fullerton, CA averages a high of 64.6° and a low of 43.9°. About 2.4 inches of precipitation fall over the month (5 wet days). The record high is 86° (1979) and the record low 27.9° (1990). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	67.5°	45.3°	5%	80.1° (1977)	33.4° (2004)
2	67.3°	45°	12%	79.3° (1977)	34.3° (2004)
3	67.5°	46.2°	12%	79.7° (1979)	35.2° (2004)
4	66.7°	45.5°	15%	83.8° (1979)	34.3° (2011)
5	66.7°	45.5°	18%	86° (1979)	36° (1983)
6	66.7°	46.2°	15%	83.3° (1979)	33.6° (2011)
7	66.4°	46.6°	28%	79.7° (2015)	29.8° (1978)
8	66.2°	45.1°	13%	83.1° (1975)	28.4° (1978)
9	66°	44.8°	12%	83.1° (2017)	30.6° (1978)
10	66°	44.6°	7%	83.5° (2017)	32.7° (1998)
11	65.1°	45.5°	15%	81.1° (2017)	33.3° (1972)
12	64.2°	44.1°	13%	82.4° (2010)	29.5° (1972)
13	63.9°	43.9°	12%	80.6° (2017)	31.5° (1985)
14	64.2°	42.6°	13%	81° (2017)	30.4° (1972)
15	64.8°	42.8°	8%	80.1° (2013)	32.2° (1975)
16	65.3°	43.3°	22%	82.8° (2013)	32.4° (1971)
17	64.8°	43.7°	18%	79.7° (2013)	34° (1965)
18	64°	43.9°	22%	82.9° (2024)	32.7° (1965)
19	63.7°	43.5°	22%	77.7° (1999)	33.3° (2006)
20	63.5°	42.8°	15%	79.9° (2020)	31.5° (1978)
21	62.8°	43.2°	18%	79.3° (2020)	28.4° (1968)
22	63°	43.3°	18%	77.4° (1960)	30° (1968)
23	63.9°	43°	20%	80.1° (1989)	27.9° (1990)
24	64.2°	42.4°	15%	81.3° (1989)	29.3° (1998)
25	64.4°	43°	18%	81° (2022)	29.3° (1990)
26	63°	42.3°	17%	80.4° (2022)	28.6° (1987)
27	62.2°	41.9°	15%	80.6° (2013)	30.6° (1987)
28	62.1°	42.6°	23%	80.8° (2017)	30.7° (1962)
29	62.2°	43°	23%	81.1° (1980)	31.8° (1988)
30	62.4°	42.4°	17%	81.5° (1980)	29.7° (1982)
31	62.4°	42.4°	18%	78.3° (1963)	31.6° (1982)