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 2024-11-05.

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% 3 8% 5% 5% 5% 4 6% 7% 35%	101796
	Night	11% 10% 4 9% 6% 5% 5% 4 5% 6% 34%	97405
Transparency	Day	46% 7% 14% 24% 9% 1	105331
	Night	48% 6% 13% 22% 10% 1	101959
Seeing	Day	16% 11% 31% 26% 13% 3	16127
	Night	16% 9% 33% 30% 11% 1	26007

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% 14% 6% 17% 7% 6% 5% 4 6% 6% 22%	2218
	11th to 20th	Day	5% 10% 4 17% 12% 8% 9% 6% 7% 5% 15%	2281
	21st to end	Day	6% 13% 10% 18% 9% 6% 5% 4 5% 6% 18%	3099
February	1st to 10th	Day	7% 14% 5% 11% 7% 6% 5% 4 6% 6% 28%	1710
	11th to 20th	Day	7% 13% 4 8% 7% 6% 7% 4 6% 6% 33%	1664
	21st to end	Day	10% 10% 4 12% 8% 6% 5% 4 5% 7% 30%	1413
March	1st to 10th	Day	10% 11% 4 8% 6% 6% 5% 3 5% 6% 35%	3391
	11th to 20th	Day	8% 10% 4 10% 6% 4 5% 4 6% 8% 35%	3480
	21st to end	Day	18% 14% 4 9% 5% 4 4 3 4 6% 30%	3814
April	1st to 10th	Day	16% 9% 5% 9% 5% 5% 4 3 5% 5% 34%	2276
	11th to 20th	Day	17% 10% 3 9% 5% 4 4 4 5% 7% 32%	2368
	21st to end	Day	20% 10% 3 7% 4 4 4 4 5% 5% 33%	2470
May	1st to 10th	Day	18% 8% 3 7% 3 4 4 4 5% 7% 36%	4319
	11th to 20th	Day	15% 7% 2 6% 4 4 4 4 6% 8% 40%	4399
	21st to end	Day	17% 8% 3 7% 5% 4 4 4 5% 8% 35%	4837
June	1st to 10th	Day	12% 6% 2 6% 4 5% 5% 5% 7% 9% 40%	2829
	11th to 20th	Day	14% 7% 2 7% 5% 5% 4 5% 6% 8% 37%	2850
	21st to end	Day	11% 5% 2 7% 5% 5% 6% 5% 8% 10% 38%	2850
July	1st to 10th	Day	7% 5% 2 6% 5% 5% 6% 5% 7% 10% 42%	4750
	11th to 20th	Day	6% 4 2 4 4 4 4 4 7% 11% 50%	4750
	21st to end	Day	6% 5% 2 5% 4 4 5% 4 9% 9% 48%	4819
August	1st to 10th	Day	10% 5% 2 5% 4 4 6% 5% 7% 9% 43%	4109
	11th to 20th	Day	13% 5% 2 5% 4 4 4 4 6% 8% 45%	4041
	21st to end	Day	14% 7% 2 6% 4 4 4 3 5% 7% 43%	4450
September	1st to 10th	Day	11% 6% 2 5% 4 3 4 3 6% 9% 47%	2280
	11th to 20th	Day	13% 7% 2 7% 5% 4 4 4 6% 8% 40%	2201
	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% 9% 6% 5% 4 3 5% 6% 28%	1519
	11th to 20th	Day	12% 17% 7% 14% 9% 5% 3 3 3 6% 22%	1520
	21st to end	Day	12% 12% 6% 14% 9% 6% 5% 4 4 6% 21%	1520
December	1st to 10th	Day	11% 14% 5% 16% 9% 7% 6% 4 5% 6% 19%	1520
	11th to 20th	Day	9% 16% 6% 13% 9% 5% 7% 4 4 4 22%	1751
	21st to end	Day	20% 16% 6% 14% 8% 5% 4 2 4 5% 16%	2442
January	1st to 10th	Night	7% 12% 5% 15% 9% 6% 5% 4 6% 6% 24%	4737
	11th to 20th	Night	5% 13% 5% 13% 10% 9% 10% 6% 6% 6% 17%	4687
	21st to end	Night	7% 15% 12% 17% 7% 5% 5% 4 5% 5% 19%	4564
February	1st to 10th	Night	6% 10% 5% 10% 6% 6% 6% 5% 7% 7% 32%	2470
	11th to 20th	Night	5% 11% 4 10% 7% 5% 6% 5% 7% 7% 33%	2403
	21st to end	Night	9% 11% 5% 12% 6% 6% 5% 5% 5% 7% 29%	2041
March	1st to 10th	Night	8% 10% 3 8% 5% 4 4 4 5% 7% 42%	3478
	11th to 20th	Night	9% 8% 3 12% 7% 5% 5% 4 6% 6% 35%	3479
	21st to end	Night	19% 17% 6% 11% 4 3 3 3 4 4 28%	3817
April	1st to 10th	Night	15% 10% 3 8% 6% 5% 4 3 5% 6% 35%	1903
	11th to 20th	Night	17% 11% 4 7% 6% 3 4 2 4 5% 37%	1759
	21st to end	Night	18% 9% 4 8% 4 3 4 3 6% 6% 35%	1710
May	1st to 10th	Night	17% 9% 3 6% 4 4 4 3 5% 6% 39%	2630
	11th to 20th	Night	14% 8% 3 6% 3 3 4 4 5% 7% 44%	2506
	21st to end	Night	17% 9% 3 7% 5% 4 5% 3 5% 7% 35%	2750
June	1st to 10th	Night	10% 6% 2 6% 4 5% 4 5% 7% 7% 44%	1347
	11th to 20th	Night	10% 7% 2 6% 4 4 4 4 6% 8% 45%	1330
	21st to end	Night	10% 5% 2 5% 5% 5% 5% 4 5% 9% 46%	1330
July	1st to 10th	Night	8% 4 2 4 4 5% 6% 4 9% 11% 44%	2220
	11th to 20th	Night	5% 3 2 3 2 3 4 3 6% 7% 62%	2220
	21st to end	Night	6% 3 1 4 3 3 5% 4 6% 10% 54%	2745
August	1st to 10th	Night	8% 5% 2 6% 4 3 4 4 6% 8% 50%	2827
	11th to 20th	Night	13% 5% 2 4 4 4 3 4 5% 8% 48%	2798
	21st to end	Night	11% 7% 2 6% 4 4 3 4 5% 7% 47%	3213
September	1st to 10th	Night	9% 5% 2 5% 4 3 5% 3 6% 7% 50%	1900
	11th to 20th	Night	8% 5% 2 7% 4 4 4 3 4 8% 50%	1976
	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% 5% 32%	2660
	11th to 20th	Night	14% 14% 5% 14% 8% 5% 3 3 4 6% 23%	2660
	21st to end	Night	12% 11% 5% 12% 8% 6% 5% 4 5% 6% 26%	2660
December	1st to 10th	Night	8% 15% 6% 13% 9% 7% 6% 4 5% 7% 19%	2660
	11th to 20th	Night	10% 14% 6% 14% 8% 6% 5% 4 6% 6% 21%	3442
	21st to end	Night	21% 17% 5% 12% 6% 5% 4 3 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	52% 6% 12% 20% 9%	2470
May	1st to 10th	Day	45% 7% 13% 22% 11% 2	4330
	11th to 20th	Day	40% 8% 15% 25% 9% 3	4403
	21st to end	Day	45% 8% 13% 26% 7% 1	4837
June	1st to 10th	Day	37% 9% 19% 24% 10% 1	2829
	11th to 20th	Day	44% 8% 13% 23% 12% 1	2850
	21st to end	Day	39% 9% 16% 27% 8%	2850
July	1st to 10th	Day	34% 9% 19% 25% 12% 1	4676
	11th to 20th	Day	27% 7% 18% 36% 11% 1	4669
	21st to end	Day	30% 8% 19% 33% 10% 1	4666
August	1st to 10th	Day	35% 7% 16% 28% 13% 1	4094
	11th to 20th	Day	35% 8% 17% 30% 9%	4080
	21st to end	Day	41% 6% 16% 28% 9% 1	4449
September	1st to 10th	Day	34% 8% 17% 31% 10%	2280
	11th to 20th	Day	41% 8% 18% 26% 7%	2201
	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	57% 6% 12% 16% 9% 1	1519
	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	49% 5% 12% 21% 12% 1	1710
May	1st to 10th	Night	44% 7% 12% 26% 11% 1	2638
	11th to 20th	Night	38% 7% 13% 24% 15% 3	2507
	21st to end	Night	46% 9% 12% 21% 11% 1	2751
June	1st to 10th	Night	36% 7% 20% 26% 9% 2	1347
	11th to 20th	Night	36% 8% 14% 23% 17% 1	1330
	21st to end	Night	35% 8% 17% 29% 10% 2	1330
July	1st to 10th	Night	31% 11% 21% 25% 12%	2185
	11th to 20th	Night	20% 6% 17% 40% 15% 1	2178
	21st to end	Night	25% 7% 19% 35% 13% 1	2658
August	1st to 10th	Night	30% 7% 19% 27% 15% 2	2818
	11th to 20th	Night	33% 7% 16% 35% 9% 1	2825
	21st to end	Night	36% 7% 19% 27% 10% 1	3213
September	1st to 10th	Night	31% 7% 16% 34% 11% 1	1900
	11th to 20th	Night	34% 7% 20% 31% 9%	1976
	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	2660
	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	24% 9% 31% 24% 12%	650
May	1st to 10th	Day	20% 14% 31% 23% 9% 2	653
	11th to 20th	Day	18% 11% 32% 25% 12% 2	675
	21st to end	Day	17% 10% 29% 28% 13% 2	734
June	1st to 10th	Day	12% 11% 29% 29% 16% 4	680
	11th to 20th	Day	15% 13% 35% 25% 10% 2	680
	21st to end	Day	14% 8% 30% 28% 15% 5%	680
July	1st to 10th	Day	9% 6% 24% 28% 23% 10%	671
	11th to 20th	Day	10% 7% 29% 25% 20% 8%	668
	21st to end	Day	7% 6% 26% 32% 22% 8%	739
August	1st to 10th	Day	10% 7% 23% 32% 22% 6%	676
	11th to 20th	Day	13% 6% 22% 31% 19% 8%	665
	21st to end	Day	15% 8% 24% 29% 19% 4	705
September	1st to 10th	Day	10% 8% 33% 29% 18% 2	490
	11th to 20th	Day	15% 7% 32% 29% 16% 3	411
	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	20% 14% 34% 24% 8% 1	282
	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	22% 8% 29% 32% 9% 1	570
May	1st to 10th	Night	20% 11% 31% 28% 8% 1	570
	11th to 20th	Night	16% 9% 31% 34% 10% 1	561
	21st to end	Night	14% 8% 31% 34% 12% 1	617
June	1st to 10th	Night	12% 7% 31% 34% 14% 1	570
	11th to 20th	Night	13% 5% 37% 37% 8%	570
	21st to end	Night	12% 7% 25% 39% 16%	570
July	1st to 10th	Night	5% 3 25% 42% 24% 1	555
	11th to 20th	Night	8% 4 27% 40% 21% 1	552
	21st to end	Night	5% 2 27% 41% 23% 2	624
August	1st to 10th	Night	7% 3 20% 49% 19% 1	567
	11th to 20th	Night	12% 4 20% 39% 22% 2	564
	21st to end	Night	12% 6% 27% 35% 19% 1	627
September	1st to 10th	Night	12% 5% 26% 38% 17% 2	570
	11th to 20th	Night	10% 6% 32% 34% 16% 2	570
	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	20% 11% 33% 28% 8%	950
	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 2024-11-03 01:11:12. Version ac07

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