King Gardens
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the King Gardens clear sky chart from 2005-11-06 to 2024-04-25.

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	12% 9% 4 8% 7% 4 5% 5% 5% 7% 34%	83090
	Night	11% 10% 5% 9% 7% 4 5% 5% 5% 6% 33%	86066
Transparency	Day	48% 7% 13% 22% 9% 1	82784
	Night	50% 6% 12% 21% 9% 1	85906
Seeing	Day	16% 11% 31% 26% 13% 3	15277
	Night	16% 9% 33% 30% 10% 1	25380

By Month

Percentage Cloud Cover NE (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% 13% 7% 15% 9% 5% 5% 5% 6% 6% 22%	2218
	11th to 20th	Day	6% 9% 5% 14% 14% 7% 8% 9% 7% 5% 15%	2281
	21st to end	Day	6% 12% 11% 15% 11% 5% 6% 5% 5% 6% 18%	3099
February	1st to 10th	Day	7% 13% 5% 10% 7% 5% 6% 5% 6% 7% 28%	1710
	11th to 20th	Day	7% 12% 4 7% 8% 5% 7% 5% 5% 7% 33%	1664
	21st to end	Day	10% 9% 4 11% 9% 4 5% 5% 5% 7% 30%	1413
March	1st to 10th	Day	10% 10% 5% 7% 7% 5% 6% 4 5% 6% 35%	3391
	11th to 20th	Day	8% 9% 5% 9% 8% 3 5% 5% 5% 8% 36%	3480
	21st to end	Day	19% 13% 4 8% 6% 3 4 4 4 6% 30%	3814
April	1st to 10th	Day	16% 8% 5% 8% 6% 3 5% 4 5% 5% 34%	2276
	11th to 20th	Day	17% 10% 4 8% 6% 3 4 5% 5% 7% 32%	2368
	21st to end	Day	20% 10% 3 6% 5% 3 4 5% 5% 6% 34%	2394
May	1st to 10th	Day	18% 9% 4 6% 4 3 4 5% 4 6% 36%	2452
	11th to 20th	Day	15% 8% 3 5% 5% 3 5% 4 6% 8% 38%	2479
	21st to end	Day	14% 7% 3 6% 6% 3 5% 6% 6% 8% 36%	2725
June	1st to 10th	Day	12% 5% 2 5% 5% 3 6% 5% 7% 9% 40%	2680
	11th to 20th	Day	14% 6% 3 6% 6% 3 5% 6% 5% 8% 38%	2700
	21st to end	Day	11% 4 2 6% 6% 3 6% 6% 7% 11% 38%	2700
July	1st to 10th	Day	7% 4 2 4 4 3 4 6% 6% 9% 51%	2700
	11th to 20th	Day	9% 5% 2 5% 5% 3 5% 5% 6% 9% 45%	2700
	21st to end	Day	5% 4 2 5% 5% 3 4 4 7% 8% 52%	2748
August	1st to 10th	Day	8% 5% 2 5% 4 4 4 6% 6% 9% 46%	2333
	11th to 20th	Day	13% 5% 2 5% 4 3 4 5% 6% 8% 46%	2301
	21st to end	Day	10% 5% 2 5% 5% 3 4 5% 5% 7% 49%	2534
September	1st to 10th	Day	12% 6% 2 5% 5% 2 3 4 6% 9% 46%	2160
	11th to 20th	Day	14% 7% 3 6% 6% 3 4 5% 6% 8% 39%	2086
	21st to end	Day	17% 8% 4 5% 5% 3 4 3 5% 7% 40%	1926
October	1st to 10th	Day	18% 11% 3 6% 5% 3 4 4 5% 6% 37%	1800
	11th to 20th	Day	19% 15% 4 6% 6% 3 3 4 3 4 33%	1800
	21st to end	Day	19% 14% 6% 7% 5% 4 4 3 5% 5% 27%	1918
November	1st to 10th	Day	11% 15% 7% 9% 6% 5% 4 3 5% 6% 29%	1487
	11th to 20th	Day	12% 16% 7% 13% 9% 4 3 4 3 6% 22%	1520
	21st to end	Day	13% 11% 7% 12% 11% 5% 6% 5% 3 6% 21%	1520
December	1st to 10th	Day	11% 12% 6% 14% 10% 6% 6% 5% 4 6% 20%	1520
	11th to 20th	Day	9% 15% 7% 12% 11% 4 7% 6% 4 4 22%	1751
	21st to end	Day	20% 15% 7% 12% 10% 4 4 3 4 5% 16%	2442
January	1st to 10th	Night	7% 11% 6% 13% 11% 5% 5% 5% 6% 6% 24%	4737
	11th to 20th	Night	5% 12% 6% 11% 12% 6% 10% 8% 6% 7% 17%	4687
	21st to end	Night	7% 14% 12% 15% 8% 4 5% 5% 5% 5% 20%	4564
February	1st to 10th	Night	6% 9% 5% 9% 7% 4 7% 7% 6% 7% 32%	2470
	11th to 20th	Night	5% 11% 4 9% 8% 4 7% 5% 7% 7% 33%	2403
	21st to end	Night	10% 10% 5% 10% 8% 4 5% 7% 5% 7% 29%	2041
March	1st to 10th	Night	9% 9% 4 7% 6% 3 4 5% 5% 7% 42%	3478
	11th to 20th	Night	9% 8% 3 10% 9% 4 5% 5% 6% 6% 35%	3479
	21st to end	Night	19% 16% 6% 9% 5% 2 3 3 4 4 28%	3817
April	1st to 10th	Night	16% 9% 3 7% 6% 4 5% 4 5% 6% 35%	1903
	11th to 20th	Night	17% 10% 4 6% 6% 2 4 3 4 5% 37%	1759
	21st to end	Night	18% 8% 4 7% 5% 2 4 4 6% 6% 36%	1665
May	1st to 10th	Night	16% 8% 4 6% 5% 2 5% 3 4 6% 41%	1506
	11th to 20th	Night	13% 8% 4 6% 4 2 4 6% 6% 8% 40%	1416
	21st to end	Night	11% 6% 3 6% 6% 3 5% 5% 6% 8% 40%	1551
June	1st to 10th	Night	10% 6% 3 5% 5% 4 4 5% 7% 7% 44%	1277
	11th to 20th	Night	9% 6% 3 5% 4 3 4 5% 6% 8% 46%	1260
	21st to end	Night	9% 5% 2 4 5% 3 5% 5% 5% 10% 46%	1260
July	1st to 10th	Night	4 3 2 3 4 2 5% 4 7% 9% 57%	1260
	11th to 20th	Night	7% 3 2 3 3 2 6% 4 6% 8% 56%	1260
	21st to end	Night	4 3 1 4 4 2 4 4 5% 10% 58%	1570
August	1st to 10th	Night	6% 4 2 4 4 3 5% 5% 6% 8% 53%	1602
	11th to 20th	Night	12% 5% 2 4 4 3 3 4 4 7% 52%	1600
	21st to end	Night	9% 5% 2 4 4 3 3 4 4 7% 55%	1821
September	1st to 10th	Night	10% 5% 2 4 5% 2 4 5% 6% 8% 50%	1800
	11th to 20th	Night	9% 5% 3 6% 5% 3 4 4 5% 8% 49%	1872
	21st to end	Night	15% 6% 3 5% 5% 2 4 3 4 6% 46%	2016
October	1st to 10th	Night	17% 9% 2 6% 6% 2 4 5% 5% 6% 38%	2160
	11th to 20th	Night	17% 11% 4 7% 5% 2 5% 4 4 6% 34%	2160
	21st to end	Night	19% 13% 4 9% 5% 3 5% 4 4 6% 29%	2434
November	1st to 10th	Night	13% 12% 5% 10% 6% 3 4 4 5% 6% 32%	2591
	11th to 20th	Night	14% 13% 6% 13% 9% 4 4 4 4 7% 23%	2660
	21st to end	Night	12% 10% 5% 10% 10% 5% 6% 5% 5% 6% 26%	2660
December	1st to 10th	Night	8% 13% 7% 12% 11% 6% 6% 5% 5% 7% 19%	2660
	11th to 20th	Night	11% 13% 6% 13% 9% 5% 6% 5% 5% 6% 21%	3442
	21st to end	Night	21% 16% 6% 11% 7% 4 4 4 4 5% 18%	5225

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	61% 7% 10% 17% 5%	2219
	11th to 20th	Day	66% 7% 8% 15% 4	2281
	21st to end	Day	66% 7% 8% 13% 6%	3099
February	1st to 10th	Day	55% 5% 10% 19% 10%	1710
	11th to 20th	Day	50% 6% 13% 19% 10% 2	1673
	21st to end	Day	53% 7% 11% 17% 11% 1	1413
March	1st to 10th	Day	48% 6% 11% 24% 10%	3393
	11th to 20th	Day	45% 7% 13% 26% 9%	3480
	21st to end	Day	56% 6% 11% 22% 5%	3814
April	1st to 10th	Day	52% 6% 9% 19% 12% 2	2276
	11th to 20th	Day	52% 6% 11% 18% 11% 1	2368
	21st to end	Day	51% 6% 12% 21% 10% 1	2394
May	1st to 10th	Day	48% 6% 12% 22% 10% 2	2452
	11th to 20th	Day	43% 7% 13% 26% 9% 2	2483
	21st to end	Day	44% 7% 14% 22% 11% 1	2725
June	1st to 10th	Day	38% 9% 19% 25% 9% 1	2680
	11th to 20th	Day	43% 8% 14% 23% 11% 1	2700
	21st to end	Day	38% 9% 16% 27% 8%	2700
July	1st to 10th	Day	28% 9% 16% 32% 14% 1	2626
	11th to 20th	Day	35% 9% 16% 25% 13% 1	2619
	21st to end	Day	28% 9% 19% 30% 13% 1	2595
August	1st to 10th	Day	33% 8% 16% 32% 9% 2	2318
	11th to 20th	Day	35% 10% 18% 26% 10% 1	2301
	21st to end	Day	35% 7% 14% 30% 13% 1	2534
September	1st to 10th	Day	35% 8% 16% 30% 10%	2160
	11th to 20th	Day	42% 8% 17% 26% 6%	2086
	21st to end	Day	45% 6% 13% 30% 5%	1926
October	1st to 10th	Day	50% 5% 15% 23% 6% 1	1800
	11th to 20th	Day	55% 6% 10% 20% 9% 1	1800
	21st to end	Day	59% 5% 13% 17% 5%	1918
November	1st to 10th	Day	56% 6% 12% 16% 9% 1	1487
	11th to 20th	Day	66% 5% 10% 11% 7% 1	1520
	21st to end	Day	64% 7% 10% 12% 5% 1	1520
December	1st to 10th	Day	65% 5% 13% 14% 4	1520
	11th to 20th	Day	65% 6% 9% 17% 3	1752
	21st to end	Day	71% 5% 6% 12% 6%	2442
January	1st to 10th	Night	59% 6% 11% 19% 5%	4737
	11th to 20th	Night	64% 7% 11% 13% 5%	4687
	21st to end	Night	66% 5% 8% 16% 5%	4564
February	1st to 10th	Night	48% 7% 12% 22% 11% 1	2470
	11th to 20th	Night	46% 7% 12% 22% 12% 1	2404
	21st to end	Night	53% 7% 10% 20% 10% 1	2041
March	1st to 10th	Night	40% 8% 16% 21% 13% 2	3489
	11th to 20th	Night	48% 7% 11% 22% 11% 1	3480
	21st to end	Night	61% 5% 9% 16% 9% 1	3817
April	1st to 10th	Night	50% 5% 11% 20% 13% 1	1903
	11th to 20th	Night	50% 5% 8% 21% 14% 1	1759
	21st to end	Night	48% 5% 12% 21% 12% 1	1665
May	1st to 10th	Night	45% 6% 12% 24% 12% 1	1506
	11th to 20th	Night	40% 8% 15% 22% 12% 2	1417
	21st to end	Night	41% 8% 13% 20% 15% 2	1552
June	1st to 10th	Night	36% 6% 21% 26% 9% 2	1277
	11th to 20th	Night	35% 8% 15% 24% 16% 2	1260
	21st to end	Night	34% 8% 18% 28% 10% 2	1260
July	1st to 10th	Night	23% 8% 20% 32% 17% 1	1225
	11th to 20th	Night	24% 9% 18% 30% 16% 2	1218
	21st to end	Night	22% 7% 19% 32% 17% 2	1483
August	1st to 10th	Night	26% 8% 17% 34% 11% 3	1593
	11th to 20th	Night	33% 7% 15% 32% 12% 1	1600
	21st to end	Night	30% 6% 15% 31% 16% 2	1821
September	1st to 10th	Night	32% 7% 16% 32% 12% 1	1800
	11th to 20th	Night	34% 7% 18% 30% 10%	1872
	21st to end	Night	40% 6% 12% 34% 9%	2016
October	1st to 10th	Night	46% 6% 13% 25% 10% 1	2160
	11th to 20th	Night	51% 6% 10% 25% 8%	2160
	21st to end	Night	57% 6% 12% 19% 6%	2434
November	1st to 10th	Night	53% 5% 11% 21% 8% 1	2591
	11th to 20th	Night	63% 5% 11% 13% 7% 1	2660
	21st to end	Night	58% 7% 14% 16% 5% 1	2660
December	1st to 10th	Night	64% 6% 13% 13% 3 1	2660
	11th to 20th	Night	62% 6% 11% 14% 5% 1	3440
	21st to end	Night	68% 7% 8% 12% 5%	5225

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	12% 11% 37% 29% 11% 1	270
	11th to 20th	Day	15% 11% 34% 31% 9%	270
	21st to end	Day	12% 7% 41% 24% 13% 2	297
February	1st to 10th	Day	15% 16% 43% 19% 6% 1	270
	11th to 20th	Day	15% 19% 37% 19% 8% 2	270
	21st to end	Day	14% 12% 44% 24% 6%	225
March	1st to 10th	Day	13% 14% 44% 20% 7% 1	270
	11th to 20th	Day	16% 10% 37% 24% 11% 2	270
	21st to end	Day	21% 13% 34% 16% 13% 2	297
April	1st to 10th	Day	20% 14% 34% 25% 7%	456
	11th to 20th	Day	23% 14% 28% 24% 10% 1	566
	21st to end	Day	23% 9% 31% 25% 12%	622
May	1st to 10th	Day	20% 14% 31% 23% 9% 2	603
	11th to 20th	Day	19% 10% 31% 25% 12% 3	625
	21st to end	Day	17% 10% 28% 29% 13% 2	679
June	1st to 10th	Day	12% 10% 27% 30% 17% 4	630
	11th to 20th	Day	14% 12% 36% 26% 11% 2	630
	21st to end	Day	13% 9% 28% 29% 16% 6%	630
July	1st to 10th	Day	10% 5% 24% 29% 23% 9%	621
	11th to 20th	Day	10% 8% 29% 26% 19% 7%	618
	21st to end	Day	7% 6% 26% 32% 21% 8%	684
August	1st to 10th	Day	9% 6% 23% 32% 24% 7%	626
	11th to 20th	Day	13% 7% 23% 31% 19% 8%	615
	21st to end	Day	14% 8% 24% 29% 20% 5%	653
September	1st to 10th	Day	11% 8% 32% 30% 18% 2	450
	11th to 20th	Day	16% 7% 31% 28% 15% 3	376
	21st to end	Day	24% 10% 33% 20% 11% 1	270
October	1st to 10th	Day	21% 12% 31% 19% 13% 5%	270
	11th to 20th	Day	19% 17% 37% 22% 5%	270
	21st to end	Day	24% 18% 36% 16% 5% 1	297
November	1st to 10th	Day	18% 15% 34% 24% 8% 1	270
	11th to 20th	Day	18% 17% 42% 20% 3	270
	21st to end	Day	21% 14% 40% 21% 4	270
December	1st to 10th	Day	13% 14% 41% 24% 8%	270
	11th to 20th	Day	17% 17% 33% 28% 5%	270
	21st to end	Day	23% 12% 32% 24% 7% 2	297
January	1st to 10th	Night	11% 11% 37% 30% 9% 2	950
	11th to 20th	Night	15% 10% 38% 29% 8% 1	950
	21st to end	Night	16% 11% 39% 26% 8% 1	1045
February	1st to 10th	Night	11% 12% 37% 30% 9% 1	950
	11th to 20th	Night	10% 14% 43% 23% 9% 2	929
	21st to end	Night	14% 9% 38% 27% 9% 2	785
March	1st to 10th	Night	14% 12% 37% 26% 10% 1	618
	11th to 20th	Night	14% 9% 42% 28% 6% 1	570
	21st to end	Night	22% 9% 28% 27% 11% 3	627
April	1st to 10th	Night	19% 11% 35% 27% 7% 1	570
	11th to 20th	Night	20% 10% 34% 27% 9% 1	563
	21st to end	Night	21% 7% 29% 32% 10% 1	555
May	1st to 10th	Night	20% 11% 32% 28% 9% 1	540
	11th to 20th	Night	17% 8% 31% 34% 10% 1	531
	21st to end	Night	14% 8% 31% 35% 12% 1	584
June	1st to 10th	Night	12% 7% 31% 35% 15% 1	540
	11th to 20th	Night	12% 5% 37% 38% 9%	540
	21st to end	Night	12% 7% 25% 39% 17%	540
July	1st to 10th	Night	4 3 25% 43% 24% 1	525
	11th to 20th	Night	8% 4 28% 40% 19% 1	522
	21st to end	Night	5% 2 26% 41% 23% 2	591
August	1st to 10th	Night	7% 3 19% 49% 20% 1	537
	11th to 20th	Night	12% 4 20% 39% 22% 2	534
	21st to end	Night	12% 5% 26% 36% 20% 2	594
September	1st to 10th	Night	13% 5% 26% 39% 17% 2	540
	11th to 20th	Night	10% 6% 31% 35% 16% 2	540
	21st to end	Night	17% 9% 34% 28% 10% 2	576
October	1st to 10th	Night	21% 9% 33% 27% 10%	720
	11th to 20th	Night	22% 10% 36% 26% 6% 1	720
	21st to end	Night	27% 12% 31% 26% 4	824
November	1st to 10th	Night	19% 11% 33% 28% 8%	925
	11th to 20th	Night	19% 13% 35% 25% 8% 1	950
	21st to end	Night	18% 15% 38% 24% 5%	950
December	1st to 10th	Night	15% 14% 34% 28% 9% 1	950
	11th to 20th	Night	19% 10% 38% 26% 6% 1	950
	21st to end	Night	24% 10% 35% 24% 6% 1	1045

Page generated at 2024-04-22 08:25:43. Version ac07

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