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 2025-09-19.

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% 5% 5% 5% 4 6% 7% 36%	126855
	Night	11% 10% 4 10% 6% 5% 5% 4 5% 6% 33%	122454
Transparency	Day	46% 6% 13% 24% 10% 1	130373
	Night	50% 6% 12% 21% 10% 1	127027
Seeing	Day	16% 11% 32% 26% 13% 3	17387
	Night	16% 9% 33% 30% 10% 1	27190

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	5% 12% 6% 16% 8% 7% 6% 4 5% 6% 25%	3178
	11th to 20th	Day	5% 10% 6% 17% 9% 7% 8% 8% 11% 5% 13%	3239
	21st to end	Day	4 12% 10% 17% 9% 6% 5% 4 5% 6% 21%	4438
February	1st to 10th	Day	7% 14% 5% 12% 7% 7% 5% 4 6% 6% 27%	1800
	11th to 20th	Day	6% 12% 4 8% 7% 6% 7% 4 6% 6% 33%	1754
	21st to end	Day	9% 10% 4 12% 8% 6% 5% 4 5% 7% 30%	1485
March	1st to 10th	Day	10% 9% 3 7% 5% 5% 5% 3 6% 9% 39%	4877
	11th to 20th	Day	9% 9% 4 9% 6% 4 5% 4 7% 9% 33%	4980
	21st to end	Day	19% 14% 4 8% 4 4 3 3 4 5% 32%	5464
April	1st to 10th	Day	16% 10% 5% 9% 5% 5% 4 3 5% 5% 33%	2396
	11th to 20th	Day	17% 10% 4 9% 5% 4 4 4 5% 7% 32%	2494
	21st to end	Day	20% 10% 3 7% 4 4 4 4 5% 5% 33%	2600
May	1st to 10th	Day	14% 7% 2 5% 3 3 3 3 4 6% 49%	6197
	11th to 20th	Day	16% 10% 3 6% 4 4 4 3 5% 6% 41%	6319
	21st to end	Day	13% 7% 3 7% 4 4 4 4 5% 8% 42%	6949
June	1st to 10th	Day	11% 6% 2 6% 4 5% 6% 4 7% 9% 40%	2978
	11th to 20th	Day	14% 7% 2 7% 6% 5% 4 5% 6% 8% 37%	3000
	21st to end	Day	11% 6% 2 7% 5% 5% 6% 5% 8% 10% 38%	3000
July	1st to 10th	Day	6% 4 2 6% 5% 5% 5% 5% 7% 10% 45%	6799
	11th to 20th	Day	12% 6% 2 5% 3 3 4 4 6% 10% 46%	6800
	21st to end	Day	8% 5% 2 5% 4 4 5% 4 8% 9% 46%	6931
August	1st to 10th	Day	10% 5% 2 6% 4 4 5% 5% 7% 9% 43%	4239
	11th to 20th	Day	13% 5% 2 5% 4 4 4 4 6% 8% 45%	4171
	21st to end	Day	14% 7% 2 6% 4 4 4 3 5% 7% 43%	4591
September	1st to 10th	Day	11% 6% 2 5% 5% 3 4 3 6% 9% 46%	2400
	11th to 20th	Day	13% 7% 2 7% 5% 4 4 4 6% 8% 40%	2295
	21st to end	Day	16% 8% 3 6% 4 4 3 2 5% 7% 42%	2032
October	1st to 10th	Day	17% 10% 3 6% 4 3 4 3 6% 6% 37%	1900
	11th to 20th	Day	17% 15% 4 7% 4 4 4 3 3 4 34%	1900
	21st to end	Day	18% 15% 6% 8% 4 5% 3 3 4 5% 27%	2024
November	1st to 10th	Day	11% 16% 6% 10% 6% 5% 4 3 5% 6% 29%	1567
	11th to 20th	Day	12% 18% 7% 14% 9% 5% 3 3 3 6% 22%	1600
	21st to end	Day	12% 12% 7% 15% 9% 6% 5% 4 4 5% 20%	1600
December	1st to 10th	Day	10% 13% 5% 17% 16% 9% 5% 3 4 5% 14%	2610
	11th to 20th	Day	8% 17% 7% 13% 7% 4 5% 4 5% 5% 26%	2750
	21st to end	Day	16% 18% 7% 20% 10% 5% 4 2 3 4 12%	3498
January	1st to 10th	Night	5% 10% 5% 18% 11% 7% 6% 4 6% 6% 24%	6787
	11th to 20th	Night	5% 12% 6% 11% 8% 8% 9% 9% 10% 6% 16%	6651
	21st to end	Night	5% 13% 11% 15% 7% 6% 6% 4 5% 7% 20%	6536
February	1st to 10th	Night	7% 10% 5% 10% 6% 6% 6% 6% 7% 7% 31%	2600
	11th to 20th	Night	5% 11% 4 9% 7% 5% 6% 5% 7% 7% 34%	2533
	21st to end	Night	9% 11% 5% 12% 6% 6% 5% 5% 6% 7% 29%	2145
March	1st to 10th	Night	10% 8% 3 7% 4 4 4 4 5% 7% 45%	5006
	11th to 20th	Night	10% 10% 3 13% 7% 6% 6% 4 5% 6% 31%	4979
	21st to end	Night	18% 15% 6% 10% 4 3 3 3 4 5% 29%	5467
April	1st to 10th	Night	16% 10% 3 8% 5% 5% 4 3 5% 6% 35%	2003
	11th to 20th	Night	16% 11% 4 8% 6% 3 4 2 5% 5% 37%	1853
	21st to end	Night	19% 9% 4 8% 4 3 4 3 6% 6% 35%	1800
May	1st to 10th	Night	13% 7% 2 6% 3 3 3 3 4 5% 49%	3762
	11th to 20th	Night	13% 10% 3 6% 3 2 3 3 5% 6% 45%	3596
	21st to end	Night	14% 8% 3 7% 5% 4 4 3 5% 7% 38%	3949
June	1st to 10th	Night	11% 6% 2 6% 4 5% 4 4 7% 7% 44%	1418
	11th to 20th	Night	11% 8% 2 6% 4 4 4 4 6% 8% 43%	1400
	21st to end	Night	10% 5% 2 5% 5% 5% 5% 4 6% 9% 46%	1400
July	1st to 10th	Night	8% 4 2 4 4 5% 5% 4 8% 10% 46%	3180
	11th to 20th	Night	7% 4 2 4 3 3 4 3 6% 8% 56%	3180
	21st to end	Night	9% 5% 2 6% 4 4 5% 4 6% 10% 47%	3943
August	1st to 10th	Night	9% 5% 2 6% 4 3 4 4 6% 8% 50%	2917
	11th to 20th	Night	13% 6% 2 3 4 4 3 4 5% 8% 48%	2888
	21st to end	Night	11% 6% 2 6% 4 4 3 4 5% 7% 47%	3314
September	1st to 10th	Night	9% 5% 2 5% 4 3 5% 3 6% 7% 50%	2000
	11th to 20th	Night	8% 5% 2 7% 4 4 4 3 4 8% 50%	2058
	21st to end	Night	14% 7% 3 6% 4 3 3 3 4 6% 48%	2128
October	1st to 10th	Night	16% 8% 2 7% 5% 3 4 3 5% 6% 40%	2280
	11th to 20th	Night	16% 11% 4 8% 4 4 4 3 4 6% 35%	2280
	21st to end	Night	19% 14% 3 10% 4 4 5% 3 4 6% 29%	2570
November	1st to 10th	Night	13% 13% 4 11% 5% 4 4 3 5% 6% 31%	2731
	11th to 20th	Night	14% 15% 5% 14% 8% 5% 3 3 4 6% 23%	2800
	21st to end	Night	12% 11% 5% 13% 9% 6% 5% 4 5% 5% 25%	2800
December	1st to 10th	Night	6% 13% 6% 17% 13% 11% 6% 3 4 6% 15%	4580
	11th to 20th	Night	10% 14% 6% 16% 8% 6% 4 4 6% 5% 20%	5440
	21st to end	Night	19% 18% 6% 17% 6% 5% 3 3 4 4 15%	7480

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	60% 5% 8% 16% 11%	3179
	11th to 20th	Day	64% 5% 6% 19% 5%	3267
	21st to end	Day	63% 6% 10% 15% 7%	4438
February	1st to 10th	Day	56% 5% 10% 19% 10%	1800
	11th to 20th	Day	49% 6% 13% 20% 10% 2	1763
	21st to end	Day	52% 7% 13% 17% 11% 1	1485
March	1st to 10th	Day	42% 5% 15% 23% 11% 4	4879
	11th to 20th	Day	45% 5% 14% 25% 10%	4980
	21st to end	Day	55% 5% 10% 21% 8%	5464
April	1st to 10th	Day	53% 6% 9% 19% 12% 2	2396
	11th to 20th	Day	52% 6% 12% 18% 11% 1	2494
	21st to end	Day	52% 6% 12% 21% 9% 1	2600
May	1st to 10th	Day	36% 6% 13% 28% 17% 1	6208
	11th to 20th	Day	43% 6% 12% 20% 14% 4	6323
	21st to end	Day	40% 6% 11% 28% 14% 1	6949
June	1st to 10th	Day	37% 9% 19% 24% 10% 1	2978
	11th to 20th	Day	45% 8% 14% 22% 11% 1	3000
	21st to end	Day	39% 9% 16% 27% 9%	3000
July	1st to 10th	Day	32% 8% 21% 30% 9%	6726
	11th to 20th	Day	34% 6% 18% 34% 8% 1	6719
	21st to end	Day	34% 7% 19% 31% 10%	6732
August	1st to 10th	Day	36% 7% 17% 27% 13% 1	4224
	11th to 20th	Day	36% 8% 17% 30% 9%	4210
	21st to end	Day	41% 6% 16% 28% 8% 1	4590
September	1st to 10th	Day	35% 8% 17% 31% 10%	2400
	11th to 20th	Day	41% 8% 19% 25% 7%	2295
	21st to end	Day	44% 5% 13% 31% 6% 1	2032
October	1st to 10th	Day	38% 3 13% 32% 13% 1	3160
	11th to 20th	Day	46% 5% 10% 21% 18% 1	3140
	21st to end	Day	56% 4 13% 21% 5%	3316
November	1st to 10th	Day	56% 6% 11% 16% 9% 1	1567
	11th to 20th	Day	66% 5% 10% 11% 7% 1	1600
	21st to end	Day	65% 7% 10% 12% 5% 1	1600
December	1st to 10th	Day	74% 4 10% 10% 2	2610
	11th to 20th	Day	61% 4 7% 18% 10%	2751
	21st to end	Day	76% 4 6% 10% 4	3498
January	1st to 10th	Night	60% 4 9% 15% 12%	6787
	11th to 20th	Night	61% 6% 10% 13% 9%	6698
	21st to end	Night	63% 5% 10% 17% 4	6536
February	1st to 10th	Night	50% 6% 12% 21% 11% 1	2600
	11th to 20th	Night	46% 7% 12% 22% 12% 1	2534
	21st to end	Night	53% 7% 10% 20% 10% 1	2145
March	1st to 10th	Night	38% 6% 17% 21% 15% 3	5017
	11th to 20th	Night	53% 6% 10% 19% 11%	4980
	21st to end	Night	59% 4 9% 17% 10% 1	5467
April	1st to 10th	Night	51% 5% 10% 20% 13% 1	2003
	11th to 20th	Night	50% 5% 9% 21% 14% 1	1853
	21st to end	Night	49% 5% 12% 21% 12% 1	1800
May	1st to 10th	Night	37% 6% 13% 27% 17% 1	3770
	11th to 20th	Night	39% 6% 11% 22% 18% 4	3597
	21st to end	Night	43% 7% 11% 24% 14% 1	3950
June	1st to 10th	Night	37% 6% 20% 26% 9% 2	1418
	11th to 20th	Night	37% 8% 15% 23% 16% 1	1400
	21st to end	Night	35% 8% 17% 29% 10% 2	1400
July	1st to 10th	Night	30% 10% 21% 28% 11%	3145
	11th to 20th	Night	25% 6% 21% 35% 11% 1	3138
	21st to end	Night	34% 6% 18% 30% 11% 1	3828
August	1st to 10th	Night	30% 7% 19% 26% 15% 2	2908
	11th to 20th	Night	33% 7% 16% 35% 9% 1	2915
	21st to end	Night	36% 7% 19% 27% 10% 1	3314
September	1st to 10th	Night	32% 7% 16% 34% 11% 1	2000
	11th to 20th	Night	34% 7% 20% 30% 9%	2058
	21st to end	Night	39% 6% 11% 34% 11%	2128
October	1st to 10th	Night	32% 4 9% 36% 16% 4	3800
	11th to 20th	Night	44% 4 10% 25% 17% 1	3779
	21st to end	Night	53% 5% 12% 22% 8%	4230
November	1st to 10th	Night	54% 5% 11% 21% 8% 1	2731
	11th to 20th	Night	63% 5% 11% 13% 7% 1	2800
	21st to end	Night	60% 6% 13% 15% 5% 1	2800
December	1st to 10th	Night	71% 6% 11% 9% 2	4580
	11th to 20th	Night	64% 4 9% 14% 8% 1	5438
	21st to end	Night	73% 5% 6% 12% 4	7480

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% 12% 38% 27% 11% 1	300
	11th to 20th	Day	15% 11% 34% 32% 8%	300
	21st to end	Day	13% 10% 41% 23% 12% 2	330
February	1st to 10th	Day	15% 17% 43% 18% 6% 1	300
	11th to 20th	Day	14% 18% 39% 19% 9% 2	300
	21st to end	Day	13% 12% 46% 23% 6%	249
March	1st to 10th	Day	13% 15% 44% 19% 7% 1	300
	11th to 20th	Day	16% 12% 37% 23% 11% 2	300
	21st to end	Day	21% 12% 36% 17% 12% 2	330
April	1st to 10th	Day	20% 15% 35% 24% 6%	496
	11th to 20th	Day	22% 15% 29% 24% 9% 1	612
	21st to end	Day	24% 10% 30% 24% 11%	700
May	1st to 10th	Day	20% 13% 31% 23% 10% 3	703
	11th to 20th	Day	19% 11% 31% 26% 11% 2	725
	21st to end	Day	17% 10% 28% 29% 13% 2	789
June	1st to 10th	Day	12% 11% 29% 29% 16% 3	730
	11th to 20th	Day	15% 12% 35% 26% 10% 2	730
	21st to end	Day	14% 8% 30% 27% 15% 5%	730
July	1st to 10th	Day	9% 5% 25% 29% 22% 9%	721
	11th to 20th	Day	10% 8% 30% 25% 20% 8%	718
	21st to end	Day	7% 7% 26% 32% 21% 7%	794
August	1st to 10th	Day	11% 7% 23% 31% 22% 6%	726
	11th to 20th	Day	13% 7% 23% 31% 19% 8%	715
	21st to end	Day	14% 8% 23% 30% 20% 4	758
September	1st to 10th	Day	11% 8% 32% 28% 18% 3	530
	11th to 20th	Day	15% 7% 31% 30% 15% 2	441
	21st to end	Day	22% 10% 33% 22% 12% 2	300
October	1st to 10th	Day	20% 13% 31% 19% 12% 4	300
	11th to 20th	Day	19% 17% 38% 22% 4	300
	21st to end	Day	23% 18% 36% 17% 5% 1	330
November	1st to 10th	Day	18% 15% 35% 24% 8% 1	300
	11th to 20th	Day	20% 17% 42% 19% 3	300
	21st to end	Day	20% 15% 40% 21% 4	300
December	1st to 10th	Day	14% 13% 41% 24% 7%	300
	11th to 20th	Day	18% 17% 32% 27% 5%	300
	21st to end	Day	23% 12% 32% 24% 7% 2	330
January	1st to 10th	Night	11% 12% 37% 30% 9% 2	1000
	11th to 20th	Night	15% 10% 37% 29% 8% 1	1000
	21st to end	Night	15% 11% 40% 26% 8% 1	1100
February	1st to 10th	Night	12% 12% 37% 30% 9% 1	1000
	11th to 20th	Night	10% 14% 43% 23% 9% 2	979
	21st to end	Night	14% 10% 38% 28% 9% 2	825
March	1st to 10th	Night	14% 12% 37% 27% 10% 1	650
	11th to 20th	Night	15% 10% 42% 28% 6% 1	600
	21st to end	Night	22% 9% 30% 26% 11% 3	660
April	1st to 10th	Night	19% 11% 35% 27% 7% 1	600
	11th to 20th	Night	20% 10% 34% 26% 8% 1	593
	21st to end	Night	23% 8% 28% 32% 9% 1	600
May	1st to 10th	Night	20% 11% 32% 29% 9% 1	600
	11th to 20th	Night	17% 9% 31% 34% 9% 1	591
	21st to end	Night	14% 8% 30% 35% 12% 1	650
June	1st to 10th	Night	13% 8% 31% 35% 14% 1	600
	11th to 20th	Night	14% 5% 36% 37% 8%	600
	21st to end	Night	12% 7% 27% 39% 16%	600
July	1st to 10th	Night	5% 3 25% 42% 24% 1	585
	11th to 20th	Night	8% 4 27% 40% 20% 1	582
	21st to end	Night	5% 2 27% 41% 23% 2	657
August	1st to 10th	Night	8% 4 20% 48% 20% 1	597
	11th to 20th	Night	12% 4 20% 39% 22% 2	594
	21st to end	Night	12% 6% 27% 35% 19% 1	660
September	1st to 10th	Night	12% 5% 26% 38% 17% 2	600
	11th to 20th	Night	10% 6% 33% 34% 16% 2	594
	21st to end	Night	16% 9% 33% 28% 11% 2	608
October	1st to 10th	Night	20% 9% 34% 27% 10%	760
	11th to 20th	Night	22% 10% 36% 26% 6% 1	760
	21st to end	Night	26% 12% 32% 26% 4	870
November	1st to 10th	Night	19% 11% 34% 28% 8%	975
	11th to 20th	Night	20% 13% 35% 24% 8% 1	1000
	21st to end	Night	18% 15% 38% 24% 5%	1000
December	1st to 10th	Night	15% 14% 35% 28% 8% 1	1000
	11th to 20th	Night	19% 11% 38% 26% 6% 1	1000
	21st to end	Night	24% 10% 35% 24% 7% 1	1100

Page generated at 2025-09-16 00:49:15. Version ac07

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