NIIGATA, JAPAN

Average Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		13.9		2.8		2.9		5.8		11.5		16.5		20.7		24.5		26.6		22.5		16.4		10.5		5.6

Average High Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		17.6		5.5		6		9.7		16		21		24.5		28.2		30.6		26.2		20.3		14.2		8.7

Average Low Temperature

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		10.6		0.2		0.1		2.3		7.3		12.7		17.6		21.7		23.4		19.2		12.8		7		2.7

Highest Recorded Temperature

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		37		15		16		25		28		32		32		36		37		36		30		25		20

Lowest Recorded Temperature

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		-10		-7		-10		-4		-1		2		10		13		15		10		3		---		-6

Average Number of Days Above 90F/32C

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		12		---		---		---		---		---		---		4		7		1		---		---		---

Average Number of Days Above 70F/21C

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		140		---		---		---		4		11		25		31		31		28		10		1		---

Average Number of Days Below 32F/0C

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		46		17		16		8		---		---		---		---		---		---		---		---		5

Average Precipitation

Years on Record: 104

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1790		190		120		100		100		90		110		170		120		170		160		190		230

Average Number of Days With Thunderstorms

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		12		1		1		---		---		1		1		1		1		1		2		2		1

Most Rain Reported in a Month

Years on Record: 104

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		2350		370		260		200		240		210		370		510		430		370		300		370		390

Least Recorded Rainfall

Years on Record: 104

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
mm		1270		10		50		50		30		30		10		10		---		20		10		80		90

Average Relative Humidity

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		71		72		71		67		65		69		74		77		73		73		71		71		72

Average Morning Relative Humidity

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		79		76		76		75		77		79		83		85		83		83		81		78		77

Average Evening Relative Humidity

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
%		65		69		67		61		58		61		68		69		66		65		62		64		68

Average Dew Point

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
C		8		-2		-2		---		4		10		15		20		21		16		10		5		---

Heating Degree Days

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2675.6		490.8		455.2		404.7		208.3		68.9		---		---		---		---		77.5		241.7		404.7

Cooling Degree Days

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		614.1		---		---		---		---		---		66.7		189.4		249.7		108.3		---		---		---

Growing Degree Days

Years on Record: 20

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		2051.1		---		---		---		41.7		189.4		316.7		447.8		508.1		358.3		180.8		8.3		---

Average Length of Day

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		12.7		10.4		11.3		12.4		13.7		14.7		15.3		15		14.1		12.9		11.6		10.6		10.1

Average Monthly Sunshine

Years on Record: 30

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Hours		1642.5		57.1		75.1		128.4		181.8		200.2		173.1		169.4		214.9		150.7		144		89.9		60.5

Average Number of Days With Fog

Years on Record: 18

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Days		60		1		2		3		5		6		9		9		9		5		5		3		3

Average Wind Speed

Years on Record: 19

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
km/h		9		22		20		19		6		8		9		6		6		6		6		8		8

Average Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.3		5.7		8.6		13.6		18.7		19.9		19.1		18.2		19		14		11		7		5.2

Average Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.9		3.1		4.2		5.7		6.9		8.3		9		8.7		7.3		6.3		4.6		3.4		2.8

Average Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		14.2		8		10.7		15.7		19		18.2		16.9		16.3		18.4		15.1		14.1		9.7		7.5

Average Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.2		7		9.6		14.7		19.1		17.8		15.3		14.5		18.4		13.6		13.3		9		6.7

Maximum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		13.3		5.7		8.6		13.6		18.7		19.9		19.1		18.2		19		14		11		7		5.2

Maximum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		6		3.2		4.3		5.8		7.4		8.6		9.1		8.9		7.8		6.4		4.8		3.5		2.8

Maximum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		16.9		10.3		13.6		18.1		23.4		20.4		19.6		20.2		22.9		17.6		15.8		11.3		9.6

Maximum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		18		10		13.6		18.3		27.6		22.2		21		22.1		27.3		17.3		15.7		11.2		9.4

Minimum Daily Solar Radiation - Global

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.7		4.1		7		12.2		15.8		16.6		16.2		15.6		12.8		10.8		8		5		4

Minimum Daily Solar Radiation - Diffuse

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		5.4		2.7		4.1		5.4		5.7		7.9		8.6		8.1		6.2		6		4.5		3.2		2.6

Minimum Daily Solar Radiation - Reflected

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		10.9		5.1		8.2		13.8		15.8		15.2		14.4		14.1		12.2		11.2		9.3		6.3		5.4

Minimum Daily Solar Radiation - Direct

Years on Record: 22

		ANNUAL		JAN		FEB		MAR		APR		MAY		JUN		JUL		AUG		SEP		OCT		NOV		DEC
Mj/m2		8.4		3.6		6.3		11.8		13.6		12.2		10.8		10.4		8.2		8		7		4.8		4.1