Weather Almanac: Simi Valley, CA 93063

🗓️ Historical norms for December 2025

November January

Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.

December avg. precipitation

🌧️ 2.99"

December days below freezing

📉 ≈0.1 days

Average December lows 43°F – 46°F

USDA Zone

10a

Annual extreme lows 30°F to 35°F

Last Spring Frost (36°F)

🌷 Apr 12

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First Fall Frost (36°F)

🍂 Nov 9

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Book Recommendations (ads!)

📚 Month-by-Month Gardening California: What to Do Each Month to Have a Beautiful Garden All Year

📚 Pacific Northwest Month-by-Month Gardening: What to Do Each Month to Have a Beautiful Garden All Year

📚 California Gardener's Handbook: Your Complete Guide: Select - Plan - Plant - Maintain - Problem-solve

F: Forecast

H: Normal High Temp

L: Normal Low Temp

Sunday

Monday

Tuesday

Wednesday

Thursday

Friday

Saturday

Mon. December 1

🌅 6:43 a.m.

H: 56°F – 72°F

L: 39°F – 51°F

🌇 4:44 p.m.

Tue. December 2

🌅 6:43 a.m.

H: 55°F – 72°F

L: 39°F – 50°F

🌇 4:44 p.m.

Wed. December 3

🌅 6:44 a.m.

H: 55°F – 72°F

L: 39°F – 50°F

🌇 4:44 p.m.

Thu. December 4

🌅 6:45 a.m.

H: 55°F – 71°F

L: 39°F – 50°F

🌇 4:44 p.m.

Fri. December 5

🌅 6:46 a.m.

H: 54°F – 71°F

L: 39°F – 50°F

🌇 4:44 p.m.

Sat. December 6

🌅 6:47 a.m.

H: 54°F – 71°F

L: 39°F – 50°F

🌇 4:44 p.m.

Sun. December 7

🌅 6:48 a.m.

H: 54°F – 71°F

L: 39°F – 50°F

🌇 4:44 p.m.

Mon. December 8

🌅 6:48 a.m.

H: 54°F – 70°F

L: 39°F – 50°F

🌇 4:44 p.m.

Tue. December 9

🌅 6:49 a.m.

H: 54°F – 70°F

L: 38°F – 50°F

🌇 4:44 p.m.

Wed. December 10

🌅 6:50 a.m.

H: 54°F – 70°F

L: 38°F – 50°F

🌇 4:45 p.m.

Thu. December 11

🌅 6:51 a.m.

H: 53°F – 70°F

L: 38°F – 50°F

🌇 4:45 p.m.

Fri. December 12

🌅 6:51 a.m.

H: 53°F – 70°F

L: 38°F – 50°F

🌇 4:45 p.m.

Sat. December 13

🌅 6:52 a.m.

H: 53°F – 70°F

L: 38°F – 50°F

🌇 4:45 p.m.

Sun. December 14

🌅 6:53 a.m.

H: 53°F – 70°F

L: 38°F – 50°F

🌇 4:46 p.m.

Mon. December 15

🌅 6:53 a.m.

H: 53°F – 70°F

L: 38°F – 50°F

🌇 4:46 p.m.

Tue. December 16

🌅 6:54 a.m.

H: 53°F – 70°F

L: 38°F – 50°F

🌇 4:46 p.m.

Wed. December 17

🌅 6:55 a.m.

H: 53°F – 70°F

L: 38°F – 50°F

🌇 4:47 p.m.

Thu. December 18

🌅 6:55 a.m.

H: 53°F – 69°F

L: 38°F – 50°F

🌇 4:47 p.m.

Fri. December 19

🌅 6:56 a.m.

H: 53°F – 69°F

L: 38°F – 50°F

🌇 4:48 p.m.

Sat. December 20

🌅 6:56 a.m.

H: 53°F – 70°F

L: 38°F – 50°F

🌇 4:48 p.m.

Sun. December 21 Winter Solstice

🌅 6:57 a.m.

H: 53°F – 69°F

L: 38°F – 50°F

🌇 4:48 p.m.

Mon. December 22

🌅 6:57 a.m.

H: 53°F – 69°F

L: 38°F – 50°F

🌇 4:49 p.m.

Tue. December 23

🌅 6:58 a.m.

H: 53°F – 69°F

L: 38°F – 50°F

🌇 4:50 p.m.

Wed. December 24 Christmas Eve

🌅 6:58 a.m.

H: 53°F – 70°F

L: 38°F – 50°F

🌇 4:50 p.m.

Thu. December 25 Christmas Day

🌅 6:59 a.m.

H: 53°F – 70°F

L: 38°F – 50°F

🌇 4:51 p.m.

Fri. December 26

🌅 6:59 a.m.

H: 53°F – 70°F

L: 38°F – 50°F

🌇 4:51 p.m.

Sat. December 27

🌅 6:59 a.m.

H: 53°F – 70°F

L: 39°F – 51°F

🌇 4:52 p.m.

Sun. December 28

🌅 7:00 a.m.

H: 54°F – 70°F

L: 38°F – 51°F

🌇 4:53 p.m.

Mon. December 29

🌅 7:00 a.m.

H: 54°F – 70°F

L: 38°F – 51°F

🌇 4:53 p.m.

Tue. December 30

🌅 7:00 a.m.

H: 54°F – 70°F

L: 39°F – 51°F

🌇 4:54 p.m.

Wed. December 31

🌅 7:00 a.m.

H: 54°F – 70°F

L: 39°F – 51°F

🌇 4:55 p.m.

November January

Jan. Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. Dec.

Temperature climatic data from weather station: NEWHALL 5NW (USC00046161)

Precipitation climatic data from weather station: CHATSWORTH FC 24 F (USC00041680)

Agricultural climatic data from weather station: CANOGA PARK PIERCE CLG (USC00041484)