Frost Dates for Clear Lake Riviera, CA

Based on data from Clearlake 4 Se weather station, 9 miles away

Frost Dates

Last Spring Frost (50%) iA 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. April 10
First Fall Frost (50%) iA 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. November 6
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30% Probability iOnly a 30% chance of frost remaining by this date. Use these dates for a safer planting window, especially for tender plants sensitive to cold.

Last Spring Frost April 18
First Fall Frost November 1

Hard Freeze (28°F)

Last Spring Hard Freeze March 14
First Fall Hard Freeze November 21
38.95°N, -122.72°W © OpenStreetMap

Growing Season

210 Days April 10 to November 6

USDA Hardiness Zone iHardiness zones indicate which perennial plants can survive winter in your area. For annual vegetables, frost dates and growing season length matter more than hardiness zone.

Zone 8b

Avg. annual minimum: 15 to 20°F (−9 to −7°C)

Learn more

Köppen Climate iThe Köppen climate classification system categorizes climates based on temperature and precipitation patterns.

Csa Hot-Summer Mediterranean

Hot, dry summers and mild, wet winters. Classic Mediterranean climate ideal for grapes, olives, tomatoes, and herbs. Summer irrigation is usually necessary.

Köppen climate map

Temperature

30° 50° 70° 90°
44°
High: 55°F
Avg: 44°F
Low: 33°F
Jan
46°
High: 58°F
Avg: 46°F
Low: 34°F
Feb
49°
High: 62°F
Avg: 49°F
Low: 35°F
Mar
53°
High: 66°F
Avg: 53°F
Low: 39°F
Apr
59°
High: 73°F
Avg: 59°F
Low: 45°F
May
67°
High: 83°F
Avg: 67°F
Low: 52°F
Jun
74°
High: 91°F
Avg: 74°F
Low: 56°F
Jul
72°
High: 91°F
Avg: 72°F
Low: 54°F
Aug
68°
High: 85°F
Avg: 68°F
Low: 50°F
Sep
59°
High: 75°F
Avg: 59°F
Low: 43°F
Oct
50°
High: 63°F
Avg: 50°F
Low: 36°F
Nov
44°
High: 55°F
Avg: 44°F
Low: 33°F
Dec
32°F
Avg High Avg Temp Avg Low Light Frost (32°F)

Precipitation

0" 2" 4" 6" 8.0"
7.6"
7.61"
Jan
7.1"
7.13"
Feb
6.3"
6.32"
Mar
3.5"
3.48"
Apr
3.0"
2.99"
May
0.4"
0.40"
Jun
0.0"
0.00"
Jul
0.0"
0.00"
Aug
0.0"
0.00"
Sep
2.6"
2.65"
Oct
5.1"
5.11"
Nov
8.0"
7.98"
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9.5h10.5h11.5h13h14h14.5h14.5h13.5h12h11h10h9.5h
Jan: 7:13 AM – 4:47 PM · 9h 33m
Feb: 6:44 AM – 5:16 PM · 10h 32m
Mar: 6:09 AM – 5:51 PM · 11h 42m
Apr: 5:29 AM – 6:31 PM · 13h 02m
May: 4:56 AM – 7:04 PM · 14h 08m
Jun: 4:39 AM – 7:21 PM · 14h 43m
Jul: 4:46 AM – 7:14 PM · 14h 29m
Aug: 5:14 AM – 6:46 PM · 13h 31m
Sep: 5:53 AM – 6:07 PM · 12h 14m
Oct: 6:31 AM – 5:29 PM · 10h 57m
Nov: 7:05 AM – 4:55 PM · 9h 50m
Dec: 7:22 AM – 4:38 PM · 9h 17m
Daylight Longest: 14h 44m · Shortest: 9h 16m

Nearby Stations

Calistoga, CA March 2 - November 23 Angwin Pacific Union College, CA April 7 - December 5 Healdsburg, CA February 15 - December 2 Cloverdale, CA February 25 - December 3 Saint Helena, CA February 3 - December 4 East Park Rsvr, CA April 6 - November 10

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