Frost Dates for IRUMA, Japan

Elevation: 80 m

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. March 26
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. December 5
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 1
First Fall Frost November 30

Hard Freeze (−2°C)

Last Spring Hard Freeze March 12
First Fall Hard Freeze December 17
35.83°N, 139.42°W © OpenStreetMap

Growing Season

254 Days March 26 to December 5

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 8a

Avg. annual minimum: −12 to −9°C

Learn more

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

Cfa Humid Subtropical

Hot, humid summers and mild winters with rain year-round. Long growing seasons support a wide variety of vegetables, fruits, and ornamentals. The most common climate in the eastern US.

Köppen climate map

Temperature

-5° 5° 15° 25°
2°
High: 8°C
Avg: 2°C
Low: -2°C
Jan
3°
High: 8°C
Avg: 3°C
Low: -1°C
Feb
7°
High: 12°C
Avg: 7°C
Low: 2°C
Mar
12°
High: 17°C
Avg: 12°C
Low: 8°C
Apr
17°
High: 22°C
Avg: 17°C
Low: 13°C
May
21°
High: 24°C
Avg: 21°C
Low: 18°C
Jun
24°
High: 28°C
Avg: 24°C
Low: 22°C
Jul
26°
High: 29°C
Avg: 26°C
Low: 23°C
Aug
22°
High: 25°C
Avg: 22°C
Low: 19°C
Sep
16°
High: 20°C
Avg: 16°C
Low: 13°C
Oct
11°
High: 15°C
Avg: 11°C
Low: 7°C
Nov
5°
High: 10°C
Avg: 5°C
Low: 1°C
Dec
0°C
−2°C
Avg High Avg Temp Avg Low Light Frost (0°C) Hard Frost (−2°C)

Precipitation

0 mm 75 mm 150 mm 225 mm
66 mm
66.0 mm
Jan
71 mm
71.1 mm
Feb
112 mm
111.8 mm
Mar
122 mm
121.9 mm
Apr
142 mm
142.2 mm
May
185 mm
185.4 mm
Jun
178 mm
177.8 mm
Jul
152 mm
152.4 mm
Aug
216 mm
215.9 mm
Sep
224 mm
223.5 mm
Oct
91 mm
91.4 mm
Nov
58 mm
58.4 mm
Dec

Sunrise / Sunset

4a7a10a1p4p7p10pNoonJanFebMarAprMayJunJulAugSepOctNovDec10h10.5h11.5h13h14h14.5h14h13.5h12h11h10h9.5h
Jan: 7:05 AM – 4:55 PM · 9h 49m
Feb: 6:39 AM – 5:21 PM · 10h 41m
Mar: 6:08 AM – 5:52 PM · 11h 44m
Apr: 5:32 AM – 6:28 PM · 12h 55m
May: 5:03 AM – 6:57 PM · 13h 54m
Jun: 4:47 AM – 7:13 PM · 14h 25m
Jul: 4:54 AM – 7:06 PM · 14h 12m
Aug: 5:19 AM – 6:41 PM · 13h 22m
Sep: 5:54 AM – 6:06 PM · 12h 13m
Oct: 6:28 AM – 5:32 PM · 11h 04m
Nov: 6:58 AM – 5:02 PM · 10h 04m
Dec: 7:13 AM – 4:47 PM · 9h 35m
Daylight Longest: 14h 26m · Shortest: 9h 34m

Nearby Stations

FUSSA YOKOTA AB, Japan March 28 - December 2 TACHIKAWA, Japan March 26 - December 5 KUMAGAYA, Japan March 27 - December 6 CHICHIBU, Japan March 28 - December 8 ATSUGI, Japan March 11 - December 17 TOKYO, JapanMarch 3 - December 19

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