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 2026-03-18.

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	18% 14% 4 9% 5% 5% 5% 4 5% 6% 25%	134597
	Night	14% 18% 5% 10% 5% 4 4 3 4 5% 27%	135771
Transparency	Day	60% 6% 14% 13% 5% 1	134234
	Night	60% 5% 9% 13% 10% 3	135715
Seeing	Day	25% 10% 21% 24% 15% 4	19681
	Night	26% 13% 28% 22% 10% 1	24225

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	7% 20% 5% 9% 5% 4 3 3 4 4 36%	2361
	11th to 20th	Day	10% 23% 8% 12% 5% 4 3 2 3 5% 26%	2689
	21st to end	Day	12% 15% 4 6% 6% 5% 3 2 3 4 40%	3732
February	1st to 10th	Day	6% 18% 4 8% 4 4 3 4 3 4 42%	1394
	11th to 20th	Day	10% 26% 7% 11% 6% 4 4 3 4 5% 21%	1583
	21st to end	Day	5% 13% 5% 11% 6% 6% 5% 4 6% 5% 34%	1486
March	1st to 10th	Day	4 21% 7% 14% 6% 5% 4 3 3 4 29%	4433
	11th to 20th	Day	6% 16% 7% 13% 5% 5% 5% 3 5% 7% 28%	4771
	21st to end	Day	7% 20% 4 7% 4 4 5% 4 5% 6% 33%	5918
April	1st to 10th	Day	7% 19% 4 11% 6% 5% 5% 5% 6% 7% 25%	2494
	11th to 20th	Day	7% 17% 4 7% 5% 4 4 4 6% 6% 37%	2766
	21st to end	Day	8% 14% 4 9% 6% 5% 5% 4 5% 6% 34%	2891
May	1st to 10th	Day	11% 20% 5% 10% 6% 6% 6% 4 6% 6% 18%	7260
	11th to 20th	Day	10% 14% 5% 12% 6% 6% 5% 4 5% 6% 27%	7347
	21st to end	Day	16% 12% 4 9% 6% 5% 6% 5% 7% 8% 23%	8911
June	1st to 10th	Day	18% 13% 4 9% 6% 5% 5% 4 6% 7% 22%	3600
	11th to 20th	Day	19% 10% 3 8% 6% 5% 5% 4 7% 7% 26%	3600
	21st to end	Day	20% 9% 3 9% 6% 6% 5% 5% 8% 8% 20%	3600
July	1st to 10th	Day	32% 10% 3 8% 5% 4 4 4 5% 6% 20%	8160
	11th to 20th	Day	26% 11% 4 9% 6% 5% 4 4 5% 7% 19%	8160
	21st to end	Day	25% 9% 3 9% 6% 5% 5% 4 5% 7% 21%	8184
August	1st to 10th	Day	43% 9% 3 7% 5% 4 4 2 3 4 16%	5206
	11th to 20th	Day	37% 11% 3 7% 4 3 4 2 3 4 21%	4697
	21st to end	Day	29% 9% 4 8% 4 4 5% 3 5% 6% 23%	5038
September	1st to 10th	Day	38% 11% 4 10% 4 3 3 3 4 5% 16%	2510
	11th to 20th	Day	37% 13% 4 9% 5% 3 3 2 4 4 16%	2400
	21st to end	Day	24% 10% 5% 8% 5% 5% 4 4 5% 5% 25%	2123
October	1st to 10th	Day	20% 14% 4 9% 5% 5% 5% 5% 7% 7% 20%	3228
	11th to 20th	Day	14% 10% 3 9% 5% 5% 4 3 5% 7% 34%	2827
	21st to end	Day	16% 15% 3 6% 4 4 4 3 4 4 36%	2721
November	1st to 10th	Day	10% 17% 6% 11% 6% 5% 4 3 4 5% 30%	1362
	11th to 20th	Day	11% 13% 4 6% 4 4 4 3 6% 5% 40%	1210
	21st to end	Day	12% 21% 4 12% 5% 4 4 2 4 3 27%	982
December	1st to 10th	Day	17% 23% 6% 9% 5% 5% 4 2 3 4 22%	1350
	11th to 20th	Day	5% 24% 9% 13% 5% 5% 5% 4 6% 5% 19%	1557
	21st to end	Day	5% 17% 6% 11% 6% 4 4 3 4 5% 35%	2046
January	1st to 10th	Night	7% 20% 5% 8% 5% 5% 4 3 4 4 35%	10564
	11th to 20th	Night	11% 24% 6% 11% 5% 3 3 2 3 3 28%	10252
	21st to end	Night	8% 17% 3 9% 5% 4 4 3 3 4 40%	10487
February	1st to 10th	Night	7% 17% 5% 9% 4 3 3 2 3 5% 41%	3223
	11th to 20th	Night	11% 25% 6% 12% 5% 4 4 3 5% 5% 21%	2924
	21st to end	Night	6% 16% 5% 12% 8% 4 4 4 5% 5% 30%	2317
March	1st to 10th	Night	5% 20% 8% 13% 6% 4 4 3 4 5% 29%	5641
	11th to 20th	Night	5% 20% 7% 12% 6% 5% 4 4 6% 6% 25%	5340
	21st to end	Night	9% 20% 5% 8% 4 4 4 3 4 5% 33%	5013
April	1st to 10th	Night	8% 23% 6% 9% 6% 6% 6% 4 6% 5% 22%	1905
	11th to 20th	Night	8% 18% 3 8% 4 5% 5% 4 6% 7% 32%	1583
	21st to end	Night	11% 16% 4 7% 6% 5% 6% 4 6% 5% 31%	1506
May	1st to 10th	Night	15% 23% 6% 11% 6% 4 4 4 5% 6% 16%	2720
	11th to 20th	Night	10% 16% 6% 13% 7% 6% 5% 4 5% 6% 24%	2560
	21st to end	Night	21% 14% 3 10% 7% 5% 6% 4 6% 6% 19%	1986
June	1st to 10th	Night	19% 14% 4 8% 6% 4 7% 5% 9% 6% 18%	800
	11th to 20th	Night	21% 11% 3 7% 5% 4 5% 4 6% 8% 27%	800
	21st to end	Night	25% 10% 4 8% 5% 5% 6% 3 7% 7% 18%	800
July	1st to 10th	Night	40% 9% 2 6% 4 4 5% 4 5% 7% 14%	1820
	11th to 20th	Night	30% 9% 4 10% 6% 6% 6% 3 5% 5% 15%	1820
	21st to end	Night	25% 10% 4 10% 6% 6% 6% 3 5% 5% 18%	2692
August	1st to 10th	Night	44% 10% 3 6% 4 4 4 3 4 5% 14%	1954
	11th to 20th	Night	42% 11% 3 7% 4 4 4 2 4 4 17%	2360
	21st to end	Night	29% 11% 4 9% 6% 5% 5% 4 3 5% 17%	2871
September	1st to 10th	Night	40% 12% 3 7% 5% 5% 3 3 3 4 15%	1888
	11th to 20th	Night	38% 13% 4 8% 5% 4 4 4 3 3 15%	2000
	21st to end	Night	28% 12% 4 7% 5% 4 6% 3 4 6% 21%	2275
October	1st to 10th	Night	22% 17% 3 9% 5% 5% 6% 4 6% 7% 17%	3953
	11th to 20th	Night	13% 11% 5% 10% 6% 6% 5% 3 5% 7% 30%	4321
	21st to end	Night	14% 14% 4 9% 4 5% 4 4 5% 6% 30%	5080
November	1st to 10th	Night	11% 19% 6% 10% 5% 4 4 3 5% 5% 28%	3154
	11th to 20th	Night	12% 16% 4 6% 5% 4 4 3 4 5% 38%	3410
	21st to end	Night	11% 21% 5% 9% 6% 4 4 3 4 4 29%	3638
December	1st to 10th	Night	17% 22% 5% 10% 5% 4 4 3 4 4 21%	6060
	11th to 20th	Night	6% 23% 10% 13% 6% 4 4 3 4 4 23%	6880
	21st to end	Night	5% 18% 6% 12% 6% 5% 4 3 4 5% 31%	9174

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	51% 4 7% 10% 14% 13%	2361
	11th to 20th	Day	62% 3 7% 15% 10% 2	2704
	21st to end	Day	50% 3 4 17% 19% 7%	3733
February	1st to 10th	Day	48% 3 10% 16% 16% 8%	1394
	11th to 20th	Day	66% 5% 7% 11% 9% 3	1590
	21st to end	Day	51% 8% 7% 18% 14% 2	1486
March	1st to 10th	Day	60% 4 4 9% 16% 6%	4433
	11th to 20th	Day	56% 4 8% 13% 16% 2	4771
	21st to end	Day	53% 5% 11% 17% 11% 3	5918
April	1st to 10th	Day	55% 8% 14% 15% 8% 1	2494
	11th to 20th	Day	49% 6% 14% 21% 10% 1	2766
	21st to end	Day	49% 6% 12% 24% 8% 1	2891
May	1st to 10th	Day	64% 6% 12% 17% 2	7260
	11th to 20th	Day	57% 6% 15% 20% 3	7350
	21st to end	Day	57% 8% 16% 18% 1	8912
June	1st to 10th	Day	60% 7% 18% 13% 2	3600
	11th to 20th	Day	57% 8% 19% 12% 3	3600
	21st to end	Day	60% 10% 23% 6%	3600
July	1st to 10th	Day	66% 8% 20% 5%	8071
	11th to 20th	Day	65% 8% 20% 7%	8061
	21st to end	Day	61% 8% 20% 10%	7953
August	1st to 10th	Day	73% 6% 17% 4 1	5187
	11th to 20th	Day	69% 4 14% 11% 1	4743
	21st to end	Day	62% 8% 19% 9% 2	5037
September	1st to 10th	Day	73% 5% 12% 7% 2	2510
	11th to 20th	Day	75% 5% 11% 8% 2	2400
	21st to end	Day	62% 6% 15% 13% 3	2123
October	1st to 10th	Day	60% 7% 13% 18% 2	3228
	11th to 20th	Day	49% 6% 15% 20% 9% 1	2827
	21st to end	Day	52% 5% 11% 24% 7% 1	2721
November	1st to 10th	Day	58% 5% 13% 14% 9% 2	1362
	11th to 20th	Day	45% 5% 9% 27% 14% 1	1210
	21st to end	Day	63% 3 9% 9% 13% 3	982
December	1st to 10th	Day	67% 4 7% 12% 10% 1	1350
	11th to 20th	Day	66% 6% 10% 11% 5% 1	1560
	21st to end	Day	52% 5% 9% 13% 14% 8%	2046
January	1st to 10th	Night	53% 3 6% 11% 14% 12%	10564
	11th to 20th	Night	63% 3 8% 11% 13% 2	10300
	21st to end	Night	49% 3 5% 17% 17% 9%	10487
February	1st to 10th	Night	49% 3 7% 17% 17% 7%	3223
	11th to 20th	Night	66% 4 7% 10% 9% 3	2928
	21st to end	Night	56% 6% 8% 15% 14% 2	2317
March	1st to 10th	Night	58% 4 5% 10% 16% 6%	5641
	11th to 20th	Night	58% 3 7% 13% 17% 2	5342
	21st to end	Night	54% 4 8% 16% 13% 4	5013
April	1st to 10th	Night	62% 7% 8% 16% 6% 1	1905
	11th to 20th	Night	53% 5% 12% 18% 11% 1	1583
	21st to end	Night	54% 6% 11% 21% 8%	1506
May	1st to 10th	Night	68% 5% 11% 15% 2	2717
	11th to 20th	Night	61% 7% 13% 17% 3	2561
	21st to end	Night	64% 7% 13% 14% 1	1986
June	1st to 10th	Night	63% 11% 16% 9% 2	800
	11th to 20th	Night	57% 7% 21% 12% 3	800
	21st to end	Night	65% 9% 21% 5%	800
July	1st to 10th	Night	69% 7% 19% 5%	1800
	11th to 20th	Night	70% 7% 17% 5%	1796
	21st to end	Night	68% 7% 17% 7%	2618
August	1st to 10th	Night	71% 6% 19% 3 1	1948
	11th to 20th	Night	71% 5% 13% 11%	2380
	21st to end	Night	69% 7% 15% 7% 2	2871
September	1st to 10th	Night	74% 5% 10% 8% 2	1888
	11th to 20th	Night	75% 7% 9% 8% 2	2000
	21st to end	Night	65% 5% 12% 13% 4	2275
October	1st to 10th	Night	66% 5% 11% 15% 3	3953
	11th to 20th	Night	53% 5% 11% 19% 10% 1	4321
	21st to end	Night	54% 6% 10% 20% 9% 1	5080
November	1st to 10th	Night	58% 5% 11% 17% 7% 2	3154
	11th to 20th	Night	50% 4 7% 26% 12%	3410
	21st to end	Night	60% 5% 7% 11% 13% 3	3638
December	1st to 10th	Night	67% 4 7% 11% 9% 1	6060
	11th to 20th	Night	66% 5% 11% 11% 6% 1	6876
	21st to end	Night	56% 5% 8% 10% 13% 7%	9174

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	22% 19% 35% 21% 3 1	110
	11th to 20th	Day	21% 22% 34% 19% 4	223
	21st to end	Day	25% 18% 33% 19% 3	352
February	1st to 10th	Day	17% 18% 32% 23% 8% 3	320
	11th to 20th	Day	23% 17% 27% 25% 7%	396
	21st to end	Day	16% 16% 32% 23% 10% 2	355
March	1st to 10th	Day	16% 15% 37% 23% 8% 1	430
	11th to 20th	Day	15% 14% 32% 24% 12% 3	498
	21st to end	Day	16% 9% 28% 25% 17% 5%	660
April	1st to 10th	Day	15% 14% 30% 23% 13% 6%	618
	11th to 20th	Day	16% 8% 26% 21% 20% 8%	690
	21st to end	Day	15% 6% 18% 32% 24% 5%	700
May	1st to 10th	Day	15% 11% 19% 29% 23% 4	703
	11th to 20th	Day	18% 6% 22% 29% 19% 5%	726
	21st to end	Day	21% 9% 19% 31% 18% 2	1006
June	1st to 10th	Day	26% 7% 16% 26% 20% 5%	930
	11th to 20th	Day	21% 8% 16% 30% 19% 6%	930
	21st to end	Day	23% 4 13% 24% 27% 7%	930
July	1st to 10th	Day	26% 7% 17% 24% 19% 7%	916
	11th to 20th	Day	32% 7% 13% 27% 15% 5%	912
	21st to end	Day	30% 7% 17% 22% 17% 5%	918
August	1st to 10th	Day	38% 7% 15% 21% 14% 4	726
	11th to 20th	Day	36% 10% 19% 21% 12% 3	715
	21st to end	Day	39% 6% 17% 19% 16% 4	803
September	1st to 10th	Day	43% 6% 15% 19% 14% 3	647
	11th to 20th	Day	42% 7% 13% 19% 14% 6%	620
	21st to end	Day	31% 9% 20% 20% 15% 5%	440
October	1st to 10th	Day	38% 10% 17% 18% 14% 3	420
	11th to 20th	Day	26% 12% 24% 25% 10% 3	420
	21st to end	Day	30% 13% 29% 20% 7% 1	462
November	1st to 10th	Day	24% 16% 30% 24% 6%	384
	11th to 20th	Day	20% 13% 37% 24% 6%	270
	21st to end	Day	25% 16% 35% 18% 5% 1	110
December	1st to 10th	Day	29% 14% 34% 22% 2	110
	11th to 20th	Day	25% 21% 32% 16% 5%	110
	21st to end	Day	26% 21% 34% 16% 3	121
January	1st to 10th	Night	20% 15% 36% 24% 5%	1060
	11th to 20th	Night	23% 21% 34% 17% 5%	1060
	21st to end	Night	25% 19% 32% 22% 1	1072
February	1st to 10th	Night	17% 19% 34% 23% 6% 1	950
	11th to 20th	Night	23% 18% 34% 21% 4	934
	21st to end	Night	16% 11% 39% 26% 8%	678
March	1st to 10th	Night	16% 18% 39% 19% 6% 1	740
	11th to 20th	Night	13% 11% 39% 29% 7% 1	728
	21st to end	Night	17% 10% 27% 26% 17% 3	672
April	1st to 10th	Night	21% 12% 27% 22% 14% 4	600
	11th to 20th	Night	17% 10% 22% 27% 18% 5%	593
	21st to end	Night	20% 6% 16% 29% 26% 4	567
May	1st to 10th	Night	23% 8% 15% 24% 26% 5%	400
	11th to 20th	Night	16% 8% 24% 29% 19% 4	346
	21st to end	Night	24% 6% 22% 23% 24% 1	217
June	1st to 10th	Night	25% 8% 20% 25% 21% 3	200
	11th to 20th	Night	26% 8% 13% 34% 18% 3	200
	21st to end	Night	31% 3 13% 26% 26% 2	200
July	1st to 10th	Night	27% 6% 17% 29% 17% 3	195
	11th to 20th	Night	37% 4 17% 26% 14% 1	194
	21st to end	Night	33% 5% 13% 22% 21% 5%	430
August	1st to 10th	Night	43% 6% 14% 17% 19% 1	398
	11th to 20th	Night	42% 9% 16% 20% 11% 3	486
	21st to end	Night	41% 6% 12% 22% 15% 4	660
September	1st to 10th	Night	45% 6% 10% 20% 15% 4	600
	11th to 20th	Night	45% 6% 13% 17% 15% 3	600
	21st to end	Night	35% 8% 26% 18% 11% 3	652
October	1st to 10th	Night	42% 8% 18% 20% 10% 2	730
	11th to 20th	Night	30% 10% 25% 23% 11% 1	910
	21st to end	Night	26% 13% 30% 22% 7% 1	1001
November	1st to 10th	Night	26% 13% 33% 23% 5%	930
	11th to 20th	Night	22% 13% 38% 24% 3	950
	21st to end	Night	24% 20% 30% 21% 5% 1	986
December	1st to 10th	Night	32% 15% 31% 18% 4	1060
	11th to 20th	Night	21% 18% 35% 19% 5% 1	1060
	21st to end	Night	25% 16% 34% 21% 4	1166

Page generated at 2026-03-14 22:23:53. Version ac07

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