Star Dogged Moon Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Star Dogged Moon Observatory clear sky chart from 2005-11-06 to 2024-11-30.

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	9% 6% 2 7% 5% 5% 6% 5% 7% 9% 38%	101198
	Night	9% 6% 2 6% 4 4 5% 4 6% 9% 42%	98341
Transparency	Day	38% 10% 16% 17% 14% 5%	104966
	Night	36% 10% 16% 18% 15% 6%	102712
Seeing	Day	10% 8% 21% 25% 21% 14%	15510
	Night	11% 6% 22% 32% 24% 5%	25563

By Month

Percentage Cloud Cover SE (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	12% 8% 3 6% 4 3 3 3 5% 7% 47%	2836
	11th to 20th	Day	18% 10% 3 8% 4 3 4 3 4 6% 38%	2840
	21st to end	Day	11% 6% 2 6% 4 4 4 3 6% 8% 45%	3202
February	1st to 10th	Day	15% 8% 2 6% 4 4 3 3 6% 6% 44%	1900
	11th to 20th	Day	11% 5% 2 5% 4 3 3 4 4 6% 51%	1848
	21st to end	Day	12% 6% 2 6% 4 4 4 3 5% 6% 48%	1620
March	1st to 10th	Day	10% 8% 3 8% 4 5% 5% 4 7% 9% 37%	3435
	11th to 20th	Day	8% 4 2 5% 3 4 5% 4 7% 9% 51%	3480
	21st to end	Day	12% 6% 2 6% 4 3 3 3 6% 9% 47%	3815
April	1st to 10th	Day	7% 4 2 5% 4 5% 5% 4 6% 8% 49%	2090
	11th to 20th	Day	8% 6% 3 7% 5% 6% 5% 4 6% 7% 43%	2093
	21st to end	Day	5% 4 2 5% 5% 5% 4 4 6% 8% 52%	2344
May	1st to 10th	Day	5% 3 2 5% 5% 5% 5% 5% 6% 9% 52%	4082
	11th to 20th	Day	10% 7% 2 8% 6% 6% 6% 5% 7% 8% 35%	4081
	21st to end	Day	6% 4 2 5% 4 5% 5% 5% 7% 10% 48%	4476
June	1st to 10th	Day	10% 8% 3 8% 7% 6% 7% 6% 8% 11% 26%	2470
	11th to 20th	Day	6% 5% 2 9% 8% 8% 8% 6% 9% 11% 27%	2470
	21st to end	Day	9% 7% 2 8% 8% 7% 7% 6% 7% 11% 27%	2470
July	1st to 10th	Day	6% 6% 3 10% 7% 8% 9% 8% 11% 14% 19%	4120
	11th to 20th	Day	4 5% 2 8% 7% 7% 8% 7% 11% 16% 28%	4120
	21st to end	Day	5% 5% 2 8% 7% 7% 9% 8% 10% 13% 25%	4466
August	1st to 10th	Day	11% 6% 3 9% 6% 7% 8% 5% 9% 12% 26%	4104
	11th to 20th	Day	6% 6% 3 8% 7% 6% 7% 5% 8% 11% 33%	3926
	21st to end	Day	9% 6% 3 9% 6% 6% 7% 6% 9% 12% 26%	3838
September	1st to 10th	Day	10% 8% 3 10% 8% 8% 8% 7% 8% 9% 22%	2090
	11th to 20th	Day	13% 8% 3 10% 6% 7% 7% 6% 7% 9% 23%	2090
	21st to end	Day	10% 7% 3 9% 6% 5% 6% 5% 5% 8% 35%	2090
October	1st to 10th	Day	12% 6% 3 7% 6% 5% 6% 4 6% 8% 36%	2085
	11th to 20th	Day	6% 4 2 5% 4 4 4 4 6% 7% 53%	1900
	21st to end	Day	8% 4 2 5% 3 4 5% 3 6% 7% 50%	2090
November	1st to 10th	Day	10% 5% 2 6% 4 4 4 4 5% 8% 47%	1957
	11th to 20th	Day	10% 7% 2 6% 5% 4 4 3 7% 6% 46%	1986
	21st to end	Day	12% 6% 2 5% 5% 4 3 4 5% 8% 46%	1797
December	1st to 10th	Day	9% 5% 2 6% 4 5% 4 3 6% 8% 47%	1710
	11th to 20th	Day	14% 7% 2 5% 4 3 4 4 6% 7% 44%	2153
	21st to end	Day	15% 8% 3 8% 4 4 3 3 4 6% 42%	3124
January	1st to 10th	Night	13% 8% 3 6% 4 4 3 3 5% 7% 43%	4109
	11th to 20th	Night	14% 9% 3 8% 4 4 4 4 5% 8% 37%	4120
	21st to end	Night	13% 7% 3 6% 4 4 4 4 5% 6% 42%	4436
February	1st to 10th	Night	12% 6% 2 6% 3 4 4 4 5% 7% 47%	2280
	11th to 20th	Night	11% 7% 3 7% 4 4 4 3 4 6% 48%	2218
	21st to end	Night	10% 6% 2 6% 5% 4 4 3 5% 6% 48%	1832
March	1st to 10th	Night	17% 10% 3 8% 5% 3 4 3 5% 7% 36%	3418
	11th to 20th	Night	7% 5% 2 5% 4 4 5% 4 7% 10% 48%	3480
	21st to end	Night	11% 6% 2 6% 3 4 4 3 6% 6% 48%	3817
April	1st to 10th	Night	7% 5% 2 4 4 3 6% 4 5% 9% 51%	2090
	11th to 20th	Night	8% 6% 2 6% 4 3 4 4 5% 9% 50%	2035
	21st to end	Night	6% 4 1 4 4 3 5% 5% 6% 7% 55%	1850
May	1st to 10th	Night	5% 3 2 5% 3 4 4 5% 7% 10% 53%	2813
	11th to 20th	Night	9% 6% 2 6% 4 4 5% 4 7% 9% 43%	2812
	21st to end	Night	3 3 1 3 3 3 3 4 6% 9% 62%	3079
June	1st to 10th	Night	9% 5% 3 7% 5% 5% 7% 5% 9% 11% 35%	1710
	11th to 20th	Night	5% 5% 2 7% 6% 7% 7% 6% 9% 14% 34%	1710
	21st to end	Night	7% 5% 3 7% 4 5% 7% 6% 9% 13% 34%	1710
July	1st to 10th	Night	7% 7% 3 11% 7% 6% 7% 5% 10% 11% 24%	2840
	11th to 20th	Night	3 5% 2 8% 7% 6% 7% 6% 9% 14% 32%	2840
	21st to end	Night	6% 7% 3 8% 6% 8% 9% 8% 10% 11% 24%	3087
August	1st to 10th	Night	10% 6% 2 7% 5% 6% 7% 6% 8% 11% 31%	2825
	11th to 20th	Night	4 4 2 6% 4 5% 6% 6% 10% 14% 41%	2899
	21st to end	Night	7% 6% 3 8% 6% 6% 6% 5% 9% 11% 33%	3786
September	1st to 10th	Night	8% 8% 2 9% 5% 7% 7% 5% 8% 11% 29%	2090
	11th to 20th	Night	12% 8% 3 8% 6% 6% 6% 5% 7% 9% 28%	2090
	21st to end	Night	10% 6% 3 8% 5% 5% 5% 4 6% 9% 40%	2090
October	1st to 10th	Night	11% 7% 3 7% 4 5% 4 3 5% 8% 43%	2093
	11th to 20th	Night	5% 4 1 6% 4 4 4 3 5% 7% 56%	2280
	21st to end	Night	8% 5% 2 5% 4 3 5% 3 6% 7% 51%	2508
November	1st to 10th	Night	9% 4 2 5% 4 4 4 3 5% 9% 51%	2341
	11th to 20th	Night	10% 7% 2 6% 3 4 3 4 5% 7% 48%	2410
	21st to end	Night	11% 6% 2 5% 5% 4 5% 3 5% 7% 47%	2599
December	1st to 10th	Night	10% 6% 2 6% 4 4 4 4 6% 8% 47%	2470
	11th to 20th	Night	12% 8% 2 7% 4 4 3 3 4 5% 47%	3042
	21st to end	Night	15% 8% 3 7% 4 4 5% 3 6% 7% 39%	4532

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	38% 6% 7% 18% 19% 13%	2837
	11th to 20th	Day	47% 5% 6% 12% 17% 12%	2840
	21st to end	Day	36% 7% 9% 19% 17% 12%	3202
February	1st to 10th	Day	41% 6% 9% 13% 21% 11%	1900
	11th to 20th	Day	34% 6% 9% 15% 23% 13%	1858
	21st to end	Day	36% 6% 11% 15% 20% 12%	1620
March	1st to 10th	Day	39% 10% 11% 18% 14% 7%	3435
	11th to 20th	Day	27% 8% 15% 18% 22% 10%	3480
	21st to end	Day	34% 6% 10% 27% 16% 8%	3815
April	1st to 10th	Day	31% 8% 13% 18% 18% 12%	2090
	11th to 20th	Day	37% 8% 9% 17% 21% 7%	2093
	21st to end	Day	27% 8% 11% 23% 22% 9%	2344
May	1st to 10th	Day	23% 11% 16% 27% 17% 5%	4120
	11th to 20th	Day	41% 11% 15% 22% 10% 2	4085
	21st to end	Day	26% 9% 17% 30% 17% 1	4489
June	1st to 10th	Day	47% 12% 17% 16% 8%	2470
	11th to 20th	Day	45% 14% 20% 17% 4	2470
	21st to end	Day	47% 14% 21% 13% 5%	2470
July	1st to 10th	Day	46% 18% 26% 9% 1	4055
	11th to 20th	Day	37% 19% 36% 6% 1	4051
	21st to end	Day	41% 19% 29% 9% 1	4324
August	1st to 10th	Day	44% 15% 27% 11% 2	4091
	11th to 20th	Day	38% 14% 23% 17% 8%	3965
	21st to end	Day	44% 16% 22% 16% 2	3838
September	1st to 10th	Day	54% 15% 16% 9% 5% 1	2090
	11th to 20th	Day	52% 14% 16% 12% 6% 1	2090
	21st to end	Day	44% 9% 13% 16% 14% 3	2090
October	1st to 10th	Day	51% 9% 10% 12% 12% 6%	3462
	11th to 20th	Day	23% 6% 8% 17% 34% 11%	3140
	21st to end	Day	22% 6% 9% 23% 32% 8%	3428
November	1st to 10th	Day	33% 7% 11% 21% 17% 13%	1957
	11th to 20th	Day	36% 6% 9% 16% 21% 10%	1986
	21st to end	Day	36% 6% 10% 18% 23% 8%	1797
December	1st to 10th	Day	34% 6% 14% 24% 16% 6%	1710
	11th to 20th	Day	39% 6% 10% 17% 17% 10%	2150
	21st to end	Day	44% 5% 7% 19% 17% 8%	3124
January	1st to 10th	Night	39% 5% 7% 15% 20% 13%	4109
	11th to 20th	Night	45% 6% 7% 17% 18% 8%	4120
	21st to end	Night	40% 9% 11% 12% 17% 11%	4436
February	1st to 10th	Night	36% 7% 10% 16% 19% 12%	2280
	11th to 20th	Night	37% 5% 9% 19% 18% 12%	2219
	21st to end	Night	35% 6% 11% 18% 19% 11%	1832
March	1st to 10th	Night	46% 8% 11% 14% 13% 7%	3418
	11th to 20th	Night	28% 8% 18% 20% 18% 8%	3480
	21st to end	Night	34% 6% 11% 20% 19% 9%	3817
April	1st to 10th	Night	29% 7% 15% 20% 19% 10%	2090
	11th to 20th	Night	31% 6% 11% 25% 20% 8%	2035
	21st to end	Night	24% 8% 15% 25% 19% 8%	1850
May	1st to 10th	Night	19% 15% 21% 25% 15% 4	2840
	11th to 20th	Night	32% 12% 20% 24% 10% 2	2813
	21st to end	Night	18% 8% 17% 35% 21% 1	3087
June	1st to 10th	Night	37% 14% 22% 20% 7%	1710
	11th to 20th	Night	36% 15% 23% 22% 4	1710
	21st to end	Night	37% 15% 25% 16% 6% 1	1710
July	1st to 10th	Night	47% 16% 25% 10% 1	2795
	11th to 20th	Night	38% 20% 31% 9% 2	2786
	21st to end	Night	44% 17% 27% 10% 2	2988
August	1st to 10th	Night	42% 15% 31% 10% 2	2814
	11th to 20th	Night	27% 17% 27% 21% 8%	2926
	21st to end	Night	39% 15% 25% 18% 3	3786
September	1st to 10th	Night	44% 17% 20% 13% 5% 1	2090
	11th to 20th	Night	48% 14% 18% 15% 5%	2090
	21st to end	Night	38% 10% 18% 19% 13% 3	2090
October	1st to 10th	Night	50% 9% 12% 12% 11% 6%	3496
	11th to 20th	Night	24% 6% 8% 18% 34% 9%	3779
	21st to end	Night	22% 6% 8% 23% 33% 8%	4120
November	1st to 10th	Night	29% 7% 14% 20% 19% 11%	2341
	11th to 20th	Night	35% 6% 10% 18% 19% 12%	2410
	21st to end	Night	36% 6% 11% 18% 20% 10%	2599
December	1st to 10th	Night	34% 6% 15% 24% 14% 6%	2470
	11th to 20th	Night	39% 5% 9% 16% 21% 10%	3044
	21st to end	Night	44% 7% 11% 17% 16% 5%	4532

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	11% 16% 49% 18% 5%	270
	11th to 20th	Day	10% 13% 46% 19% 10% 1	270
	21st to end	Day	20% 21% 44% 14% 2	297
February	1st to 10th	Day	17% 17% 35% 24% 6% 1	270
	11th to 20th	Day	16% 15% 40% 21% 8%	270
	21st to end	Day	11% 16% 36% 27% 11%	275
March	1st to 10th	Day	8% 18% 34% 29% 10% 1	460
	11th to 20th	Day	14% 13% 33% 26% 12% 2	460
	21st to end	Day	11% 14% 31% 28% 14% 2	506
April	1st to 10th	Day	13% 12% 33% 24% 16% 2	460
	11th to 20th	Day	11% 13% 32% 27% 14% 3	452
	21st to end	Day	5% 8% 30% 30% 15% 11%	460
May	1st to 10th	Day	6% 8% 26% 30% 19% 11%	463
	11th to 20th	Day	10% 5% 20% 28% 22% 15%	487
	21st to end	Day	9% 3 10% 28% 34% 16%	529
June	1st to 10th	Day	14% 3 12% 28% 23% 19%	490
	11th to 20th	Day	9% 3 12% 25% 28% 24%	490
	21st to end	Day	4 3 7% 24% 33% 29%	490
July	1st to 10th	Day	7% 2 6% 15% 31% 39%	485
	11th to 20th	Day	6% 2 4 13% 35% 41%	484
	21st to end	Day	8% 2 6% 18% 33% 34%	532
August	1st to 10th	Day	12% 2 4 20% 29% 33%	486
	11th to 20th	Day	6% 3 5% 17% 29% 40%	479
	21st to end	Day	10% 3 8% 20% 30% 30%	539
September	1st to 10th	Day	12% 6% 8% 16% 29% 29%	490
	11th to 20th	Day	14% 3 8% 29% 26% 19%	490
	21st to end	Day	10% 5% 10% 24% 34% 17%	490
October	1st to 10th	Day	12% 6% 25% 29% 20% 7%	490
	11th to 20th	Day	6% 7% 20% 31% 30% 6%	490
	21st to end	Day	9% 5% 24% 37% 21% 4	539
November	1st to 10th	Day	12% 6% 27% 30% 20% 5%	495
	11th to 20th	Day	15% 9% 29% 29% 14% 4	486
	21st to end	Day	12% 10% 37% 28% 11% 2	299
December	1st to 10th	Day	11% 14% 36% 24% 12% 4	270
	11th to 20th	Day	17% 12% 33% 28% 9% 1	270
	21st to end	Day	13% 10% 32% 33% 9% 2	297
January	1st to 10th	Night	14% 13% 34% 28% 10% 1	760
	11th to 20th	Night	13% 12% 28% 35% 12% 1	760
	21st to end	Night	17% 14% 36% 27% 6%	836
February	1st to 10th	Night	15% 9% 32% 33% 11%	760
	11th to 20th	Night	13% 12% 32% 35% 8% 1	743
	21st to end	Night	11% 11% 33% 38% 6%	628
March	1st to 10th	Night	11% 12% 33% 36% 8%	760
	11th to 20th	Night	11% 12% 33% 32% 12% 1	760
	21st to end	Night	9% 11% 33% 36% 10%	836
April	1st to 10th	Night	9% 10% 31% 36% 13% 1	760
	11th to 20th	Night	10% 10% 33% 34% 13%	751
	21st to end	Night	7% 6% 27% 41% 18% 1	710
May	1st to 10th	Night	6% 3 24% 45% 19% 2	570
	11th to 20th	Night	6% 4 18% 42% 28% 3	561
	21st to end	Night	7% 2 7% 42% 37% 5%	617
June	1st to 10th	Night	12% 1 12% 36% 34% 6%	570
	11th to 20th	Night	7% 2 9% 28% 40% 14%	570
	21st to end	Night	9% 2 5% 23% 43% 18%	570
July	1st to 10th	Night	7% 3 6% 19% 45% 20%	555
	11th to 20th	Night	5% 1 4 15% 52% 23%	552
	21st to end	Night	5% 1 3 20% 53% 17%	624
August	1st to 10th	Night	8% 2 5% 18% 48% 19%	567
	11th to 20th	Night	6% 1 4 14% 54% 21%	564
	21st to end	Night	12% 3 6% 24% 40% 15%	807
September	1st to 10th	Night	10% 3 8% 25% 41% 13%	760
	11th to 20th	Night	12% 4 9% 34% 33% 9%	760
	21st to end	Night	12% 3 11% 31% 37% 7%	760
October	1st to 10th	Night	14% 2 21% 33% 27% 3	760
	11th to 20th	Night	5% 5% 22% 39% 27% 2	760
	21st to end	Night	10% 6% 20% 39% 23% 1	836
November	1st to 10th	Night	10% 6% 27% 34% 22% 2	780
	11th to 20th	Night	12% 7% 27% 36% 17% 1	800
	21st to end	Night	13% 6% 31% 34% 16% 1	800
December	1st to 10th	Night	11% 8% 27% 33% 19% 1	760
	11th to 20th	Night	14% 9% 28% 34% 15% 1	760
	21st to end	Night	15% 9% 26% 36% 14%	836

Page generated at 2024-11-27 17:30:53. Version ac07

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