Singular Days

(Niigata)
Days when it tends to be fine
Date Fine weather ratio
of the day
[%]		 Fine weather ratio
before and after 10 days
[%]		 Difference of
fine weather ratio
[%]		 Statistic Z
Jan. 26 22.5 11.3 +11.3+2.07
Feb. 8 30.0 16.8 +13.3+2.08
Mar. 26 55.0 37.0 +18.0+2.23
Apr. 11 62.5 44.3 +18.3+2.21
May 22 67.5 51.0 +16.5+1.99
May 26 70.0 52.5 +17.5+2.12
Jun. 8 60.0 42.3 +17.8+2.16
Jun. 15 60.0 38.5 +21.5+2.64
Aug. 29 67.5 47.8 +19.8+2.38
Dec. 16 30.0 14.0 +16.0+2.67

Days when it tends not to be fine
Date Fine weather ratio
of the day
[%]		 Fine weather ratio
before and after 10 days
[%]		 Difference of
fine weather ratio
[%]		 Statistic Z
Jan. 23 2.5 14.0 -11.5-2.07
Mar. 16 17.5 34.0 -16.5-2.12
Apr. 9 32.5 49.8 -17.3-2.08
May 21 32.5 54.0 -21.5-2.60
Aug. 26 35.0 54.0 -19.0-2.29
Oct. 19 30.0 46.5 -16.5-2.00

Days when it tends to rain or snow
Date Precipitation ratio
of the day
[%]		 Precipitation ratio
before and after 10 days
[%]		 Difference of
precipitation ratio
[%]		 Statistic Z
Mar. 16 70.0 49.8 +20.3+2.44
Mar. 31 55.0 38.5 +16.5+2.03
May 14 47.5 29.3 +18.3+2.38
May 17 47.5 31.0 +16.5+2.12
Jun. 3 40.0 25.5 +14.5+1.97
Jun. 4 45.0 25.8 +19.3+2.60
Jun. 20 55.0 37.3 +17.8+2.20
Jun. 27 60.0 43.3 +16.8+2.03
Aug. 26 47.5 31.8 +15.8+2.02
Sep. 26 60.0 41.3 +18.8+2.28
Nov. 10 72.5 52.8 +19.8+2.39
Dec. 5 87.5 72.4 +15.1+2.07

Days when it tends not to rain or snow
Date Precipitation ratio
of the day
[%]		 Precipitation ratio
before and after 10 days
[%]		 Difference of
precipitation ratio
[%]		 Statistic Z
Jan. 11 55.0 71.0 -16.0-2.10
Feb. 8 52.5 69.0 -16.5-2.12
Apr. 3 25.0 41.5 -16.5-2.03
Apr. 11 25.0 41.3 -16.3-2.00
Jun. 23 27.5 47.8 -20.3-2.45
Jul. 7 30.0 47.3 -17.3-2.09
Sep. 29 30.0 46.5 -16.5-2.00
Nov. 7 32.5 52.8 -20.3-2.44
Nov. 16 42.5 62.0 -19.5-2.40
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