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Weather
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Overview:
Japan has a full four seasons. Its 3,000+ islands stretch from the equivalent of the US-Canadian border in the north to Key West and Cuba in the south. As the currents in the Northern Pacific Ocean move in a clockwise manner, Japan is fortunate to have the "Japan Current" coming up from the south throughout the year bringing warm water and more favorable climatic conditions than might be expected given its latitude range. Between 50% and 75% of the land area of Japan is mountainous and covered with forests providing a vertical range of climates as well. Its highest peak is Mt. Fuji at 12,390 ft. (3,776 m.)
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The following data reflect the weather in Tokyo, the capital. Data is available for some additional non-capital cities on their respective web page(s).
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Average Monthly High/Low Temperature in ° F
Jan 48/35; Feb 49/36; Mar 54/41; Apr 64/50; May 72/58; Jun 76/66; Jul 82/71; Aug 86/75; Sep 79/69; Oct 69/58; Nov 61/49; Dec 53/40.
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Average Monthly High/Low Temperature in ° C
Jan 10/2; Feb 10/2; Mar 13/5; Apr 18/11; May 23/15; Jun 25/19; Jul 29/23; Aug 31/24; Sep 27/21; Oct 22/15; Nov 17/10; Dec 12/5.
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Number of Days with Rain ( > 1 mm.)
Jan 4.6; Feb 5.8; Mar 9.5; Apr 10.1; May 9.6; Jun 11.9; Jul 10.4; Aug 8.2; Sep 11.3; Oct 9.1; Nov 6.2; Dec 3.8.
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Mean Total Rainfall (in inches)
Jan 2; Feb 2; Mar 5; Apr 5; May 5; Jun 7; Jul 6; Aug 6; Sep 8; Oct 6; Nov 4; Dec 2.
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Mean Total Rainfall (in mm.)
Jan 49; Feb 60; Mar 115; Apr 130; May 128; Jun 165; Jul 162; Aug 155; Sep 209; Oct 163; Nov 93; Dec 40.
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Mean Daily Hours of Sunshine
Jan 5.6; Feb 5.4; Mar 5.3; Apr 5.4; May 5.9; Jun 4.1; Jul 4.4; Aug 5.7; Sep 3.7; Oct 4.2; Nov 4.6; Dec 5.3.
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Average # of days above 90° F / 32° C
Jan 0; Feb 0; Mar 0; Apr 0; May 0; Jun 0; Jul 5; Aug 10; Sep 2; Oct 0; Nov 0; Dec 0.
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Average # of days above 70° F / 21° C
Jan 0; Feb 0; Mar 1; Apr 8; May 22; Jun 27; Jul 30; Aug 31; Sep 28; Oct 16; Nov 3; Dec 0.
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Average # of days below 32° F / 0° C
Jan 10; Feb 7; Mar 0; Apr 0; May 0; Jun 0; Jul 0; Aug 0; Sep 0; Oct 0; Nov 0; Dec 2.
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Sources:
The Japan Meteorological Agency through the World Weather Information Service of the World Meteorological Organization website maintained by the Hong Kong Observatory; and weatherbase.com.
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