K'esugi Ken Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the K'esugi Ken Campground clear sky chart from 2005-11-06 to 2024-12-06.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	20% 14% 4 9% 5% 5% 4 4 5% 6% 25%	106847
	Night	15% 17% 5% 9% 5% 4 4 3 5% 5% 28%	101505
Transparency	Day	60% 6% 14% 13% 5% 1	106533
	Night	59% 5% 10% 13% 10% 3	101468
Seeing	Day	26% 9% 21% 24% 16% 4	18140
	Night	26% 12% 28% 23% 10% 2	22399

By Month

Percentage Cloud Cover NW (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	9% 14% 4 10% 6% 5% 5% 4 6% 6% 32%	1269
	11th to 20th	Day	7% 19% 5% 10% 4 4 3 3 4 5% 37%	1421
	21st to end	Day	9% 13% 4 6% 7% 6% 4 3 4 5% 40%	2003
February	1st to 10th	Day	6% 20% 5% 9% 4 4 3 4 3 3 40%	1260
	11th to 20th	Day	11% 26% 7% 10% 6% 3 4 3 5% 5% 21%	1427
	21st to end	Day	6% 13% 5% 11% 7% 6% 5% 4 5% 5% 33%	1348
March	1st to 10th	Day	4 18% 6% 13% 7% 5% 4 2 3 3 35%	3018
	11th to 20th	Day	8% 13% 6% 11% 5% 4 5% 3 5% 7% 32%	3283
	21st to end	Day	10% 29% 6% 9% 5% 4 4 3 3 4 23%	4128
April	1st to 10th	Day	7% 19% 4 10% 6% 5% 5% 4 6% 7% 26%	2369
	11th to 20th	Day	7% 16% 4 6% 5% 4 4 4 6% 6% 38%	2626
	21st to end	Day	9% 13% 3 9% 6% 5% 5% 4 5% 6% 35%	2746
May	1st to 10th	Day	12% 20% 5% 10% 6% 6% 6% 5% 6% 6% 18%	5070
	11th to 20th	Day	7% 12% 5% 11% 6% 6% 6% 4 6% 6% 31%	5118
	21st to end	Day	16% 11% 3 9% 6% 5% 5% 4 6% 8% 26%	6205
June	1st to 10th	Day	18% 12% 4 9% 6% 5% 5% 4 6% 7% 23%	3420
	11th to 20th	Day	19% 10% 4 9% 6% 5% 5% 5% 6% 7% 24%	3420
	21st to end	Day	20% 9% 3 9% 6% 6% 5% 5% 7% 8% 20%	3420
July	1st to 10th	Day	36% 11% 4 8% 5% 4 4 4 5% 5% 15%	5700
	11th to 20th	Day	34% 12% 4 8% 5% 4 4 3 5% 5% 17%	5700
	21st to end	Day	27% 9% 3 8% 5% 5% 4 4 5% 6% 23%	5700
August	1st to 10th	Day	43% 9% 3 7% 5% 4 4 3 3 4 15%	5046
	11th to 20th	Day	38% 11% 3 7% 4 3 4 2 3 4 21%	4551
	21st to end	Day	28% 9% 4 8% 5% 4 5% 3 5% 6% 23%	4884
September	1st to 10th	Day	37% 11% 4 10% 4 3 3 3 4 5% 17%	2385
	11th to 20th	Day	37% 13% 4 8% 5% 3 3 2 4 4 16%	2280
	21st to end	Day	24% 10% 4 8% 5% 5% 4 4 5% 5% 25%	2017
October	1st to 10th	Day	19% 13% 4 9% 5% 4 5% 5% 7% 7% 21%	3129
	11th to 20th	Day	14% 10% 3 9% 5% 5% 5% 3 4 7% 35%	2740
	21st to end	Day	17% 15% 3 6% 3 3 4 3 4 4 37%	2636
November	1st to 10th	Day	10% 17% 6% 10% 5% 5% 4 3 4 6% 30%	1296
	11th to 20th	Day	11% 13% 4 6% 4 4 4 3 6% 5% 40%	1153
	21st to end	Day	13% 21% 4 12% 5% 4 4 2 4 3 27%	935
December	1st to 10th	Day	17% 21% 6% 11% 5% 5% 3 3 3 4 23%	780
	11th to 20th	Day	7% 26% 9% 12% 5% 4 4 3 5% 3 21%	967
	21st to end	Day	7% 19% 7% 9% 5% 4 4 3 4 5% 33%	1397
January	1st to 10th	Night	7% 20% 5% 9% 6% 5% 5% 4 5% 6% 30%	5686
	11th to 20th	Night	9% 17% 5% 10% 5% 4 4 3 4 4 35%	5488
	21st to end	Night	7% 14% 3 8% 5% 4 4 3 3 4 44%	5666
February	1st to 10th	Night	7% 19% 5% 9% 5% 3 2 2 3 4 39%	2917
	11th to 20th	Night	11% 26% 6% 11% 5% 4 4 3 5% 5% 21%	2640
	21st to end	Night	6% 16% 5% 13% 7% 4 4 4 5% 5% 29%	2103
March	1st to 10th	Night	5% 18% 7% 10% 5% 4 3 3 4 6% 36%	3836
	11th to 20th	Night	6% 18% 5% 10% 5% 5% 5% 4 6% 6% 31%	3673
	21st to end	Night	13% 29% 7% 10% 4 3 3 2 3 3 24%	3503
April	1st to 10th	Night	8% 23% 6% 9% 6% 6% 6% 4 6% 5% 22%	1810
	11th to 20th	Night	8% 17% 3 8% 4 5% 5% 4 6% 7% 33%	1503
	21st to end	Night	11% 16% 3 6% 5% 5% 6% 3 6% 5% 33%	1431
May	1st to 10th	Night	16% 23% 5% 11% 6% 4 5% 4 6% 6% 15%	1900
	11th to 20th	Night	7% 13% 5% 14% 7% 6% 5% 4 6% 7% 27%	1782
	21st to end	Night	17% 11% 4 10% 7% 6% 5% 4 6% 7% 24%	1381
June	1st to 10th	Night	19% 12% 4 8% 6% 4 7% 5% 9% 6% 19%	760
	11th to 20th	Night	22% 11% 3 7% 5% 4 5% 4 6% 8% 25%	760
	21st to end	Night	26% 11% 4 8% 5% 5% 6% 3 6% 7% 18%	760
July	1st to 10th	Night	42% 9% 2 6% 4 4 5% 3 4 6% 13%	1270
	11th to 20th	Night	39% 9% 4 8% 5% 5% 5% 2 4 5% 15%	1270
	21st to end	Night	28% 9% 3 8% 5% 5% 5% 3 5% 6% 22%	1868
August	1st to 10th	Night	44% 10% 3 6% 4 4 4 3 4 5% 14%	1894
	11th to 20th	Night	42% 11% 3 7% 3 3 4 2 4 4 17%	2286
	21st to end	Night	28% 11% 4 9% 6% 5% 6% 4 3 5% 18%	2783
September	1st to 10th	Night	39% 12% 3 7% 5% 5% 3 3 4 4 16%	1793
	11th to 20th	Night	38% 12% 4 8% 5% 5% 4 4 3 3 15%	1900
	21st to end	Night	27% 11% 4 7% 5% 4 6% 3 4 6% 22%	2161
October	1st to 10th	Night	21% 16% 3 9% 5% 5% 6% 4 6% 7% 17%	3832
	11th to 20th	Night	13% 11% 5% 10% 6% 5% 5% 3 5% 7% 31%	4188
	21st to end	Night	14% 14% 4 9% 4 5% 4 4 5% 6% 31%	4923
November	1st to 10th	Night	11% 19% 6% 10% 5% 4 4 3 5% 5% 28%	3000
	11th to 20th	Night	12% 16% 4 6% 4 4 3 3 4 5% 39%	3247
	21st to end	Night	12% 20% 5% 9% 6% 4 4 3 4 4 29%	3465
December	1st to 10th	Night	17% 22% 5% 9% 4 4 4 3 5% 4 24%	3516
	11th to 20th	Night	8% 25% 9% 13% 6% 4 4 3 4 4 21%	4240
	21st to end	Night	7% 19% 6% 11% 6% 5% 4 3 4 5% 30%	6270

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	49% 7% 11% 17% 12% 4	1269
	11th to 20th	Day	48% 5% 10% 20% 13% 3	1436
	21st to end	Day	48% 4 4 9% 23% 12%	2003
February	1st to 10th	Day	50% 3 10% 13% 16% 8%	1260
	11th to 20th	Day	65% 5% 7% 11% 8% 3	1434
	21st to end	Day	51% 7% 8% 19% 13% 2	1348
March	1st to 10th	Day	55% 5% 5% 9% 18% 9%	3018
	11th to 20th	Day	50% 5% 8% 16% 19% 3	3283
	21st to end	Day	66% 5% 11% 8% 8% 2	4128
April	1st to 10th	Day	55% 7% 14% 16% 8% 1	2369
	11th to 20th	Day	48% 6% 14% 22% 11% 1	2626
	21st to end	Day	48% 6% 13% 24% 9% 1	2746
May	1st to 10th	Day	64% 6% 14% 14% 2	5070
	11th to 20th	Day	52% 5% 15% 24% 3	5121
	21st to end	Day	55% 7% 14% 21% 2	6206
June	1st to 10th	Day	59% 7% 19% 14% 2	3420
	11th to 20th	Day	60% 8% 17% 12% 4	3420
	21st to end	Day	61% 10% 22% 6%	3420
July	1st to 10th	Day	71% 8% 15% 5%	5611
	11th to 20th	Day	70% 7% 16% 8%	5601
	21st to end	Day	61% 8% 19% 12%	5519
August	1st to 10th	Day	73% 6% 16% 4 1	5027
	11th to 20th	Day	70% 4 13% 11% 1	4597
	21st to end	Day	62% 8% 19% 10% 2	4883
September	1st to 10th	Day	72% 6% 13% 7% 3	2385
	11th to 20th	Day	75% 5% 11% 8% 2	2280
	21st to end	Day	61% 6% 15% 13% 3	2017
October	1st to 10th	Day	59% 7% 14% 18% 2	3129
	11th to 20th	Day	49% 6% 15% 20% 9% 1	2740
	21st to end	Day	51% 5% 11% 25% 7% 1	2636
November	1st to 10th	Day	57% 5% 12% 14% 9% 3	1296
	11th to 20th	Day	46% 5% 9% 27% 13% 1	1153
	21st to end	Day	63% 3 9% 9% 14% 3	935
December	1st to 10th	Day	66% 3 8% 10% 12% 1	780
	11th to 20th	Day	67% 6% 7% 12% 6% 2	970
	21st to end	Day	55% 5% 7% 8% 15% 10%	1397
January	1st to 10th	Night	53% 5% 9% 17% 11% 4	5686
	11th to 20th	Night	53% 3 9% 16% 15% 4	5536
	21st to end	Night	44% 4 5% 10% 22% 16%	5666
February	1st to 10th	Night	51% 3 6% 14% 17% 8%	2917
	11th to 20th	Night	66% 4 7% 11% 9% 3	2644
	21st to end	Night	57% 6% 8% 15% 13% 1	2103
March	1st to 10th	Night	51% 5% 5% 12% 19% 9%	3836
	11th to 20th	Night	51% 4 8% 15% 19% 3	3675
	21st to end	Night	68% 4 9% 9% 7% 4	3503
April	1st to 10th	Night	61% 7% 8% 16% 6% 1	1810
	11th to 20th	Night	51% 5% 13% 19% 11% 1	1503
	21st to end	Night	53% 6% 11% 21% 8%	1431
May	1st to 10th	Night	69% 5% 12% 12% 1	1900
	11th to 20th	Night	57% 7% 13% 20% 3	1783
	21st to end	Night	58% 7% 14% 19% 2	1381
June	1st to 10th	Night	61% 11% 17% 9% 2	760
	11th to 20th	Night	58% 7% 20% 12% 3	760
	21st to end	Night	66% 9% 20% 5%	760
July	1st to 10th	Night	72% 6% 17% 5%	1250
	11th to 20th	Night	74% 6% 14% 7%	1246
	21st to end	Night	63% 8% 19% 10%	1810
August	1st to 10th	Night	72% 6% 18% 3 1	1888
	11th to 20th	Night	71% 5% 13% 11%	2306
	21st to end	Night	69% 7% 15% 7% 2	2783
September	1st to 10th	Night	73% 6% 11% 9% 2	1793
	11th to 20th	Night	75% 7% 8% 8% 2	1900
	21st to end	Night	65% 5% 12% 14% 4	2161
October	1st to 10th	Night	65% 5% 11% 15% 3	3832
	11th to 20th	Night	53% 5% 11% 19% 11% 1	4188
	21st to end	Night	54% 6% 10% 20% 9% 1	4923
November	1st to 10th	Night	58% 4 11% 17% 7% 2	3000
	11th to 20th	Night	50% 4 7% 27% 12%	3247
	21st to end	Night	60% 5% 8% 11% 13% 3	3465
December	1st to 10th	Night	64% 5% 8% 11% 12% 1	3516
	11th to 20th	Night	68% 5% 7% 12% 7% 1	4236
	21st to end	Night	57% 4 7% 9% 15% 9%	6270

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	19% 19% 33% 24% 3 1	90
	11th to 20th	Day	17% 23% 34% 22% 4	191
	21st to end	Day	24% 19% 34% 20% 3	308
February	1st to 10th	Day	19% 18% 29% 22% 9% 3	280
	11th to 20th	Day	24% 17% 25% 25% 8%	340
	21st to end	Day	15% 17% 30% 25% 11% 2	307
March	1st to 10th	Day	16% 15% 36% 23% 9% 1	370
	11th to 20th	Day	17% 14% 30% 23% 13% 3	441
	21st to end	Day	17% 9% 28% 25% 16% 5%	616
April	1st to 10th	Day	14% 14% 28% 24% 14% 6%	576
	11th to 20th	Day	15% 8% 25% 22% 21% 9%	640
	21st to end	Day	14% 6% 19% 32% 24% 5%	650
May	1st to 10th	Day	15% 9% 19% 30% 23% 4	653
	11th to 20th	Day	18% 7% 22% 29% 19% 5%	676
	21st to end	Day	22% 9% 19% 32% 16% 2	940
June	1st to 10th	Day	25% 7% 15% 27% 21% 5%	870
	11th to 20th	Day	22% 8% 16% 28% 19% 6%	870
	21st to end	Day	24% 5% 13% 24% 27% 7%	870
July	1st to 10th	Day	27% 7% 16% 24% 19% 7%	856
	11th to 20th	Day	33% 7% 13% 27% 15% 5%	852
	21st to end	Day	31% 7% 16% 22% 18% 6%	857
August	1st to 10th	Day	39% 8% 15% 20% 14% 4	676
	11th to 20th	Day	37% 10% 17% 21% 12% 3	665
	21st to end	Day	37% 6% 17% 19% 16% 4	748
September	1st to 10th	Day	41% 5% 15% 20% 15% 4	605
	11th to 20th	Day	43% 7% 12% 19% 13% 6%	580
	21st to end	Day	31% 9% 20% 20% 14% 6%	409
October	1st to 10th	Day	37% 9% 17% 19% 15% 4	390
	11th to 20th	Day	26% 12% 23% 25% 11% 3	390
	21st to end	Day	31% 12% 28% 20% 8% 1	429
November	1st to 10th	Day	25% 15% 30% 24% 5%	358
	11th to 20th	Day	21% 13% 36% 24% 6%	253
	21st to end	Day	25% 18% 34% 17% 5% 1	100
December	1st to 10th	Day	28% 15% 33% 23% 1	95
	11th to 20th	Day	26% 18% 32% 19% 6%	90
	21st to end	Day	26% 17% 35% 17% 4	99
January	1st to 10th	Night	18% 15% 36% 26% 6%	940
	11th to 20th	Night	21% 20% 35% 18% 6%	940
	21st to end	Night	25% 19% 33% 21% 1	958
February	1st to 10th	Night	18% 18% 33% 23% 6% 1	850
	11th to 20th	Night	24% 17% 32% 22% 4	834
	21st to end	Night	16% 11% 37% 27% 9%	608
March	1st to 10th	Night	17% 18% 38% 19% 7% 1	660
	11th to 20th	Night	14% 12% 38% 28% 7% 1	660
	21st to end	Night	18% 10% 27% 27% 16% 2	638
April	1st to 10th	Night	22% 12% 26% 22% 15% 4	570
	11th to 20th	Night	16% 9% 22% 28% 19% 5%	563
	21st to end	Night	21% 6% 15% 29% 25% 4	539
May	1st to 10th	Night	23% 7% 14% 24% 26% 6%	380
	11th to 20th	Night	15% 8% 24% 30% 19% 4	329
	21st to end	Night	23% 6% 22% 23% 25% 1	206
June	1st to 10th	Night	25% 7% 19% 25% 21% 3	190
	11th to 20th	Night	27% 7% 13% 31% 18% 3	190
	21st to end	Night	31% 3 13% 25% 26% 2	190
July	1st to 10th	Night	26% 6% 17% 29% 18% 3	185
	11th to 20th	Night	39% 4 17% 26% 14% 1	184
	21st to end	Night	34% 5% 13% 21% 22% 5%	408
August	1st to 10th	Night	43% 6% 14% 18% 17% 1	378
	11th to 20th	Night	44% 9% 15% 19% 11% 3	461
	21st to end	Night	41% 6% 12% 22% 16% 4	627
September	1st to 10th	Night	44% 5% 10% 21% 15% 4	570
	11th to 20th	Night	46% 6% 13% 17% 15% 3	570
	21st to end	Night	35% 7% 26% 17% 11% 3	617
October	1st to 10th	Night	41% 7% 19% 20% 11% 2	689
	11th to 20th	Night	30% 10% 24% 23% 12% 1	860
	21st to end	Night	26% 13% 31% 22% 7% 1	946
November	1st to 10th	Night	27% 13% 33% 22% 5%	880
	11th to 20th	Night	22% 13% 38% 23% 3	900
	21st to end	Night	24% 19% 30% 21% 5% 1	933
December	1st to 10th	Night	32% 14% 31% 19% 4	972
	11th to 20th	Night	21% 15% 36% 21% 6% 1	940
	21st to end	Night	25% 14% 32% 23% 5%	1034

Page generated at 2024-12-03 02:45:10. Version ac07

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