Frost Dates for OMU, Japan

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 30
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 11
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 May 4
First Fall Frost November 7

Hard Freeze (−2°C)

Last Spring Hard Freeze April 18
First Fall Hard Freeze November 19
44.58°N, 142.97°W © OpenStreetMap

Growing Season

195 Days April 30 to November 11

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 7a

Avg. annual minimum: −18 to −15°C

Learn more

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

Dfb Warm-Summer Continental

Warm summers and cold, snowy winters. A shorter growing season than hot-summer continental. Hardy vegetables, root crops, and cool-season greens do well. Season extension is valuable.

Köppen climate map

Temperature

-10° 0° 10° 20°
-6°
High: -4°C
Avg: -6°C
Low: -9°C
Jan
-6°
High: -3°C
Avg: -6°C
Low: -9°C
Feb
-2°
High: 1°C
Avg: -2°C
Low: -5°C
Mar
4°
High: 7°C
Avg: 4°C
Low: 1°C
Apr
10°
High: 14°C
Avg: 10°C
Low: 7°C
May
14°
High: 17°C
Avg: 14°C
Low: 11°C
Jun
18°
High: 21°C
Avg: 18°C
Low: 15°C
Jul
20°
High: 23°C
Avg: 20°C
Low: 17°C
Aug
17°
High: 20°C
Avg: 17°C
Low: 14°C
Sep
10°
High: 13°C
Avg: 10°C
Low: 8°C
Oct
3°
High: 6°C
Avg: 3°C
Low: 1°C
Nov
-3°
High: -1°C
Avg: -3°C
Low: -5°C
Dec
0°C
−2°C
Avg High Avg Temp Avg Low Light Frost (0°C) Hard Frost (−2°C)

Precipitation

0 mm 50 mm 100 mm 150 mm
74 mm
73.7 mm
Jan
53 mm
53.3 mm
Feb
69 mm
68.6 mm
Mar
71 mm
71.1 mm
Apr
81 mm
81.3 mm
May
81 mm
81.3 mm
Jun
104 mm
104.1 mm
Jul
122 mm
121.9 mm
Aug
130 mm
129.5 mm
Sep
97 mm
96.5 mm
Oct
89 mm
88.9 mm
Nov
79 mm
78.7 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec9h10h11.5h13.5h14.5h15.5h15h14h12.5h10.5h9.5h8.5h
Jan: 7:30 AM – 4:30 PM · 8h 60m
Feb: 6:54 AM – 5:06 PM · 10h 12m
Mar: 6:11 AM – 5:49 PM · 11h 38m
Apr: 5:22 AM – 6:38 PM · 13h 15m
May: 4:42 AM – 7:18 PM · 14h 37m
Jun: 4:19 AM – 7:41 PM · 15h 21m
Jul: 4:29 AM – 7:31 PM · 15h 03m
Aug: 5:04 AM – 6:56 PM · 13h 52m
Sep: 5:51 AM – 6:09 PM · 12h 17m
Oct: 6:38 AM – 5:22 PM · 10h 43m
Nov: 7:20 AM – 4:40 PM · 9h 20m
Dec: 7:41 AM – 4:19 PM · 8h 39m
Daylight Longest: 15h 22m · Shortest: 8h 38m

Nearby Stations

MOMBETSU, Japan April 30 - November 9 KITAMIESASHI, Japan April 29 - November 9 ASAHIKAWA, Japan May 4 - October 25 HABORO, Japan April 22 - November 14 RUMOI, Japan April 25 - November 12 WAKKANAI, Japan April 27 - November 10

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