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Simi Valley, California Weather Summary
December,
2021
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
| 1 | 2 | 3 | 4 | |||
| 5 | 6 | 7 | 8 | 9 | 10 | 11 |
| 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 19 | 20 | 21 | 22 | 23 | 24 | 25 |
| 26 | 27 | 28 | 29 | 30 | 31 |
| Extremes | Average | Normal | ||
| High Temperature: | 84.5°F (29.2°C) | at 12:26PM Dec 1 | 61.0°F (16.1°C) | 65°F (19°C) |
| Low Temperature: | 34.7°F (1.5°C) | at 4:51AM Dec 15 | 42.8°F (6.0°C) | 47°F (8°C) |
| Month Average: | 51.5°F (10.8°C) | for 31 days | ||
| Normal Average: | 56°F (13°C) | |||
| Precipitation: | 9.03" (229.3 mm) | |||
| Date | High | Low | Average | Precipitation |
| December 1 | 84.5°F(29.2°C) | 56.8°F(13.8°C) | 73.1°F(22.9°C) | 0.00"(0.0 mm) |
| December 2 | 71.3°F(21.8°C) | 47.2°F(8.5°C) | 56.2°F(13.5°C) | 0.00"(0.0 mm) |
| December 3 | 61.9°F(16.6°C) | 42.4°F(5.8°C) | 50.4°F(10.2°C) | 0.00"(0.0 mm) |
| December 4 | 62.8°F(17.1°C) | 42.4°F(5.8°C) | 49.9°F(10.0°C) | 0.00"(0.0 mm) |
| December 5 | 78.9°F(26.0°C) | 40.7°F(4.8°C) | 56.9°F(13.8°C) | 0.00"(0.0 mm) |
| December 6 | 72.7°F(22.6°C) | 45.2°F(7.3°C) | 56.6°F(13.7°C) | 0.00"(0.0 mm) |
| December 7 | 62.7°F(17.1°C) | 48.9°F(9.4°C) | 56.1°F(13.4°C) | 0.03"(0.7 mm) |
| December 8 | 63.9°F(17.7°C) | 44.6°F(7.0°C) | 53.9°F(12.2°C) | 0.00"(0.0 mm) |
| December 9 | 55.0°F(12.8°C) | 43.0°F(6.1°C) | 51.6°F(10.9°C) | 0.23"(5.8 mm) |
| December 10 | 61.3°F(16.3°C) | 42.2°F(5.6°C) | 51.7°F(10.9°C) | 0.00"(0.0 mm) |
| December 11 | 64.0°F(17.8°C) | 41.4°F(5.2°C) | 53.2°F(11.8°C) | 0.00"(0.0 mm) |
| December 12 | 62.4°F(16.9°C) | 37.9°F(3.3°C) | 48.7°F(9.3°C) | 0.00"(0.0 mm) |
| December 13 | 54.9°F(12.7°C) | 40.8°F(4.9°C) | 49.4°F(9.7°C) | 0.05"(1.2 mm) |
| December 14 | 55.1°F(12.8°C) | 37.2°F(2.9°C) | 47.6°F(8.6°C) | 1.75"(44.4 mm) |
| December 15 | 54.5°F(12.5°C) | 34.7°F(1.5°C) | 43.3°F(6.3°C) | 0.00"(0.0 mm) |
| December 16 | 52.5°F(11.4°C) | 35.9°F(2.2°C) | 45.0°F(7.2°C) | 0.16"(4.0 mm) |
| December 17 | 61.5°F(16.4°C) | 47.7°F(8.7°C) | 53.5°F(11.9°C) | 0.00"(0.0 mm) |
| December 18 | 64.7°F(18.1°C) | 50.7°F(10.4°C) | 55.9°F(13.3°C) | 0.00"(0.0 mm) |
| December 19 | 67.6°F(19.8°C) | 38.9°F(3.8°C) | 51.2°F(10.7°C) | 0.00"(0.0 mm) |
| December 20 | 65.9°F(18.8°C) | 35.0°F(1.7°C) | 51.1°F(10.6°C) | 0.00"(0.0 mm) |
| December 21 | 66.7°F(19.3°C) | 45.6°F(7.6°C) | 57.0°F(13.9°C) | 0.00"(0.0 mm) |
| December 22 | 62.8°F(17.1°C) | 44.2°F(6.8°C) | 53.9°F(12.2°C) | 0.07"(1.7 mm) |
| December 23 | 53.0°F(11.7°C) | 49.8°F(9.9°C) | 51.0°F(10.5°C) | 2.27"(57.6 mm) |
| December 24 | 57.9°F(14.4°C) | 46.6°F(8.1°C) | 52.3°F(11.3°C) | 0.72"(18.2 mm) |
| December 25 | 54.4°F(12.4°C) | 46.7°F(8.2°C) | 49.1°F(9.5°C) | 0.42"(10.6 mm) |
| December 26 | 54.9°F(12.7°C) | 39.5°F(4.2°C) | 46.4°F(8.0°C) | 0.01"(0.2 mm) |
| December 27 | 49.7°F(9.8°C) | 37.9°F(3.3°C) | 44.1°F(6.7°C) | 0.21"(5.3 mm) |
| December 28 | 54.3°F(12.4°C) | 37.7°F(3.2°C) | 44.6°F(7.0°C) | 0.00"(0.0 mm) |
| December 29 | 49.9°F(10.0°C) | 40.1°F(4.5°C) | 45.8°F(7.7°C) | 0.54"(13.7 mm) |
| December 30 | 51.3°F(10.7°C) | 45.0°F(7.2°C) | 48.3°F(9.0°C) | 2.56"(65.0 mm) |
| December 31 | 57.8°F(14.3°C) | 41.0°F(5.0°C) | 49.0°F(9.4°C) | 0.01"(0.2 mm) |