Kingman Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kingman Observatory clear sky chart from 2005-11-06 to 2025-05-26.

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	14% 11% 5% 9% 5% 4 4 3 5% 7% 34%	113744
	Night	15% 13% 5% 10% 5% 4 4 3 5% 6% 30%	115700
Transparency	Day	49% 6% 12% 21% 12% 1	117330
	Night	54% 6% 10% 18% 11% 1	120257
Seeing	Day	19% 13% 29% 23% 13% 4	16459
	Night	21% 11% 28% 28% 11% 1	26417

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	11% 22% 11% 22% 5% 4 2 2 3 4 14%	3617
	11th to 20th	Day	12% 18% 10% 17% 13% 9% 8% 2 2 3 7%	3620
	21st to end	Day	19% 19% 7% 14% 4 4 4 3 3 4 18%	3982
February	1st to 10th	Day	13% 18% 6% 14% 9% 6% 4 4 4 4 18%	1899
	11th to 20th	Day	14% 15% 7% 16% 8% 5% 4 2 4 5% 20%	1948
	21st to end	Day	16% 15% 8% 11% 6% 4 5% 3 4 5% 23%	1650
March	1st to 10th	Day	17% 12% 6% 11% 4 3 3 2 4 6% 31%	4480
	11th to 20th	Day	10% 9% 7% 8% 4 4 4 4 6% 9% 35%	4782
	21st to end	Day	18% 16% 7% 10% 5% 5% 4 3 4 5% 22%	5774
April	1st to 10th	Day	17% 14% 4 7% 5% 4 4 3 5% 7% 32%	2400
	11th to 20th	Day	15% 11% 3 6% 4 4 4 3 5% 6% 38%	2379
	21st to end	Day	18% 9% 3 7% 4 4 4 4 6% 7% 35%	2600
May	1st to 10th	Day	18% 8% 2 6% 4 4 5% 4 6% 8% 36%	4212
	11th to 20th	Day	14% 8% 3 6% 4 4 4 3 6% 7% 40%	4211
	21st to end	Day	11% 6% 2 6% 4 4 3 3 6% 8% 47%	4895
June	1st to 10th	Day	10% 6% 1 6% 5% 4 4 3 6% 7% 46%	2660
	11th to 20th	Day	9% 5% 2 6% 5% 4 4 4 6% 7% 47%	2660
	21st to end	Day	11% 6% 2 6% 4 4 4 4 6% 8% 44%	2660
July	1st to 10th	Day	12% 6% 3 7% 4 5% 6% 4 6% 8% 38%	4440
	11th to 20th	Day	7% 4 1 5% 3 4 4 4 6% 10% 51%	4440
	21st to end	Day	7% 6% 2 7% 4 5% 5% 4 7% 8% 46%	4813
August	1st to 10th	Day	10% 5% 2 6% 3 4 4 3 6% 8% 48%	4149
	11th to 20th	Day	10% 5% 2 6% 4 4 4 4 6% 7% 47%	3959
	21st to end	Day	7% 5% 2 5% 4 4 4 4 6% 9% 48%	4180
September	1st to 10th	Day	10% 6% 2 6% 4 5% 5% 3 6% 8% 46%	2274
	11th to 20th	Day	12% 4 2 5% 3 4 5% 4 6% 8% 47%	2090
	21st to end	Day	13% 8% 2 6% 4 3 5% 3 6% 8% 40%	2090
October	1st to 10th	Day	15% 7% 3 7% 4 4 4 4 4 6% 44%	2090
	11th to 20th	Day	21% 9% 2 7% 4 3 6% 3 5% 7% 32%	1867
	21st to end	Day	23% 12% 3 8% 5% 4 5% 4 5% 6% 25%	1881
November	1st to 10th	Day	15% 13% 3 8% 4 4 4 4 5% 6% 36%	1762
	11th to 20th	Day	17% 20% 5% 10% 6% 4 3 4 4 5% 24%	1800
	21st to end	Day	20% 20% 6% 10% 4 4 3 3 3 5% 23%	1800
December	1st to 10th	Day	11% 20% 11% 19% 3 3 3 2 4 5% 19%	2690
	11th to 20th	Day	15% 22% 11% 15% 7% 4 3 3 4 4 12%	3008
	21st to end	Day	24% 23% 8% 15% 5% 3 3 3 3 4 9%	3982
January	1st to 10th	Night	14% 21% 11% 21% 5% 4 3 2 4 4 10%	6348
	11th to 20th	Night	14% 20% 9% 21% 8% 9% 6% 2 2 2 8%	6360
	21st to end	Night	19% 17% 9% 12% 6% 5% 6% 2 3 4 17%	6996
February	1st to 10th	Night	16% 16% 5% 12% 9% 5% 3 3 4 5% 22%	2497
	11th to 20th	Night	14% 16% 5% 14% 8% 5% 4 3 5% 5% 22%	2338
	21st to end	Night	18% 15% 6% 12% 5% 4 4 2 4 5% 25%	1980
March	1st to 10th	Night	15% 12% 6% 10% 4 4 3 3 4 6% 33%	5373
	11th to 20th	Night	11% 9% 3 7% 4 5% 4 4 4 7% 41%	5176
	21st to end	Night	19% 13% 5% 9% 4 4 4 3 4 5% 30%	5197
April	1st to 10th	Night	16% 11% 3 7% 5% 4 5% 4 5% 7% 34%	2000
	11th to 20th	Night	19% 11% 2 6% 4 4 4 3 4 6% 36%	1970
	21st to end	Night	18% 7% 4 7% 5% 4 4 4 5% 6% 37%	1800
May	1st to 10th	Night	15% 9% 3 8% 5% 4 5% 4 6% 8% 34%	2903
	11th to 20th	Night	18% 7% 2 6% 4 3 4 3 5% 7% 40%	2886
	21st to end	Night	16% 6% 2 6% 3 4 4 4 5% 7% 42%	2788
June	1st to 10th	Night	9% 5% 2 5% 3 3 4 4 7% 9% 48%	1520
	11th to 20th	Night	9% 6% 3 4 5% 4 5% 4 7% 9% 44%	1520
	21st to end	Night	10% 3 2 7% 4 5% 4 5% 7% 9% 41%	1520
July	1st to 10th	Night	9% 5% 2 7% 5% 5% 5% 4 8% 8% 42%	2530
	11th to 20th	Night	7% 4 1 4 3 3 4 4 6% 7% 56%	2530
	21st to end	Night	6% 6% 2 6% 5% 5% 4 5% 8% 8% 46%	2750
August	1st to 10th	Night	9% 6% 2 6% 4 4 5% 4 6% 9% 45%	2780
	11th to 20th	Night	10% 4 2 5% 3 4 5% 4 6% 8% 50%	2867
	21st to end	Night	9% 5% 2 6% 4 4 4 4 6% 7% 49%	3476
September	1st to 10th	Night	10% 7% 2 6% 4 4 3 3 4 7% 49%	1900
	11th to 20th	Night	11% 5% 2 4 3 3 2 3 6% 8% 54%	2076
	21st to end	Night	13% 6% 2 7% 4 5% 4 4 5% 8% 42%	2090
October	1st to 10th	Night	15% 7% 2 5% 4 3 3 3 5% 7% 45%	2090
	11th to 20th	Night	20% 11% 3 7% 4 4 4 3 4 6% 35%	2310
	21st to end	Night	25% 10% 3 7% 5% 3 4 3 4 5% 31%	2717
November	1st to 10th	Night	15% 12% 4 6% 5% 3 4 3 4 5% 38%	2536
	11th to 20th	Night	16% 18% 5% 11% 5% 4 4 3 5% 6% 25%	2600
	21st to end	Night	19% 20% 6% 8% 4 4 4 2 4 6% 23%	2600
December	1st to 10th	Night	12% 18% 8% 17% 7% 5% 4 3 5% 5% 16%	4481
	11th to 20th	Night	16% 23% 10% 16% 7% 4 3 2 3 4 11%	5199
	21st to end	Night	24% 23% 7% 11% 5% 4 4 3 4 4 10%	6996

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	75% 5% 9% 9% 2	3618
	11th to 20th	Day	82% 6% 7% 3 2	3620
	21st to end	Day	71% 4 10% 11% 3	3982
February	1st to 10th	Day	68% 6% 9% 10% 5% 1	1899
	11th to 20th	Day	65% 5% 10% 13% 6%	1958
	21st to end	Day	62% 6% 11% 13% 7% 1	1650
March	1st to 10th	Day	55% 5% 10% 21% 8%	4480
	11th to 20th	Day	45% 5% 14% 28% 7% 1	4782
	21st to end	Day	64% 6% 9% 14% 6%	5776
April	1st to 10th	Day	52% 6% 11% 20% 11%	2400
	11th to 20th	Day	46% 7% 10% 22% 13% 3	2379
	21st to end	Day	47% 7% 12% 20% 12% 2	2600
May	1st to 10th	Day	44% 9% 12% 25% 11% 1	4250
	11th to 20th	Day	40% 8% 13% 27% 11% 1	4215
	21st to end	Day	33% 8% 11% 24% 23% 1	4908
June	1st to 10th	Day	36% 7% 11% 25% 19% 2	2660
	11th to 20th	Day	34% 7% 13% 24% 19% 3	2660
	21st to end	Day	37% 9% 14% 22% 16% 3	2660
July	1st to 10th	Day	44% 5% 13% 20% 16% 3	4371
	11th to 20th	Day	28% 6% 17% 33% 16% 1	4365
	21st to end	Day	35% 7% 16% 19% 20% 3	4662
August	1st to 10th	Day	34% 6% 14% 30% 15% 1	4134
	11th to 20th	Day	33% 7% 13% 31% 15% 1	3998
	21st to end	Day	32% 6% 13% 26% 20% 3	4179
September	1st to 10th	Day	34% 7% 16% 23% 16% 3	2274
	11th to 20th	Day	33% 6% 12% 29% 18% 2	2090
	21st to end	Day	40% 7% 12% 23% 16% 1	2090
October	1st to 10th	Day	30% 4 9% 36% 20% 1	3480
	11th to 20th	Day	40% 6% 11% 21% 23%	3070
	21st to end	Day	50% 5% 10% 24% 10% 2	3081
November	1st to 10th	Day	48% 7% 11% 20% 13% 1	1762
	11th to 20th	Day	62% 6% 9% 15% 6% 1	1800
	21st to end	Day	66% 5% 10% 15% 4	1800
December	1st to 10th	Day	69% 4 15% 10% 2	2690
	11th to 20th	Day	75% 5% 10% 8% 1	3005
	21st to end	Day	80% 4 6% 8% 2	3982
January	1st to 10th	Night	76% 6% 7% 9% 2	6348
	11th to 20th	Night	84% 5% 6% 4 2	6360
	21st to end	Night	72% 4 13% 8% 3	6996
February	1st to 10th	Night	65% 5% 10% 12% 6% 1	2497
	11th to 20th	Night	63% 6% 10% 15% 6%	2339
	21st to end	Night	62% 5% 10% 15% 6% 2	1980
March	1st to 10th	Night	53% 6% 10% 23% 7% 1	5373
	11th to 20th	Night	42% 6% 12% 28% 10% 2	5176
	21st to end	Night	56% 6% 10% 18% 10% 1	5197
April	1st to 10th	Night	48% 7% 12% 20% 12% 1	2000
	11th to 20th	Night	48% 6% 9% 20% 15% 3	1970
	21st to end	Night	47% 7% 10% 20% 14% 2	1800
May	1st to 10th	Night	46% 7% 12% 22% 11% 1	2930
	11th to 20th	Night	41% 7% 13% 23% 15% 1	2887
	21st to end	Night	39% 8% 10% 19% 22% 2	2796
June	1st to 10th	Night	32% 6% 13% 29% 17% 3	1520
	11th to 20th	Night	35% 7% 14% 23% 19% 2	1520
	21st to end	Night	36% 9% 17% 22% 14% 2	1520
July	1st to 10th	Night	38% 6% 14% 24% 13% 6%	2490
	11th to 20th	Night	27% 6% 14% 24% 28% 2	2482
	21st to end	Night	34% 8% 16% 17% 23% 3	2662
August	1st to 10th	Night	35% 6% 13% 29% 16% 1	2771
	11th to 20th	Night	32% 7% 11% 29% 20% 1	2894
	21st to end	Night	34% 5% 10% 29% 20% 3	3476
September	1st to 10th	Night	35% 7% 12% 23% 19% 5%	1900
	11th to 20th	Night	29% 6% 8% 30% 25% 2	2076
	21st to end	Night	40% 6% 11% 25% 17% 2	2090
October	1st to 10th	Night	27% 4 9% 32% 26% 1	3480
	11th to 20th	Night	43% 4 9% 21% 22% 1	3846
	21st to end	Night	44% 5% 8% 27% 16% 1	4467
November	1st to 10th	Night	49% 6% 9% 21% 14% 1	2536
	11th to 20th	Night	61% 5% 11% 15% 7% 1	2600
	21st to end	Night	64% 6% 10% 16% 5%	2600
December	1st to 10th	Night	69% 4 13% 11% 3	4481
	11th to 20th	Night	78% 5% 8% 7% 2	5201
	21st to end	Night	77% 5% 9% 7% 2	6996

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	21% 19% 35% 18% 5% 1	300
	11th to 20th	Day	24% 19% 37% 15% 4 1	300
	21st to end	Day	26% 18% 35% 18% 2	330
February	1st to 10th	Day	28% 20% 32% 16% 3 1	300
	11th to 20th	Day	27% 26% 29% 15% 3	300
	21st to end	Day	24% 28% 37% 9% 2	249
March	1st to 10th	Day	25% 21% 39% 12% 3 1	300
	11th to 20th	Day	27% 17% 33% 17% 5% 1	406
	21st to end	Day	30% 18% 28% 17% 5% 1	550
April	1st to 10th	Day	28% 18% 31% 19% 4 1	500
	11th to 20th	Day	24% 22% 27% 17% 7% 2	492
	21st to end	Day	26% 13% 32% 19% 8% 2	500
May	1st to 10th	Day	27% 14% 29% 21% 8% 2	503
	11th to 20th	Day	21% 12% 28% 23% 12% 4	527
	21st to end	Day	14% 10% 33% 24% 14% 5%	760
June	1st to 10th	Day	11% 9% 32% 30% 14% 4	680
	11th to 20th	Day	12% 8% 31% 29% 16% 4	680
	21st to end	Day	15% 8% 31% 28% 15% 4	680
July	1st to 10th	Day	10% 5% 25% 28% 23% 10%	671
	11th to 20th	Day	10% 6% 28% 30% 19% 7%	668
	21st to end	Day	8% 4 25% 37% 20% 6%	739
August	1st to 10th	Day	11% 3 18% 31% 26% 12%	519
	11th to 20th	Day	11% 7% 22% 26% 27% 8%	479
	21st to end	Day	10% 5% 21% 31% 25% 9%	539
September	1st to 10th	Day	13% 8% 20% 30% 21% 8%	490
	11th to 20th	Day	10% 5% 17% 30% 25% 13%	490
	21st to end	Day	18% 11% 20% 24% 17% 9%	490
October	1st to 10th	Day	19% 10% 26% 26% 17% 3	490
	11th to 20th	Day	26% 15% 28% 25% 6%	367
	21st to end	Day	33% 14% 31% 16% 5%	330
November	1st to 10th	Day	20% 18% 32% 21% 6% 2	300
	11th to 20th	Day	27% 23% 30% 16% 5%	300
	21st to end	Day	33% 16% 37% 12% 2	300
December	1st to 10th	Day	25% 25% 31% 13% 5% 1	300
	11th to 20th	Day	21% 28% 35% 12% 4 1	300
	21st to end	Day	27% 26% 31% 14% 2	330
January	1st to 10th	Night	24% 17% 34% 20% 5%	1000
	11th to 20th	Night	26% 16% 34% 20% 4	1000
	21st to end	Night	22% 16% 34% 24% 4	1100
February	1st to 10th	Night	26% 12% 37% 22% 3	840
	11th to 20th	Night	22% 17% 33% 24% 3	783
	21st to end	Night	26% 14% 39% 17% 3	660
March	1st to 10th	Night	22% 15% 32% 24% 7% 1	800
	11th to 20th	Night	19% 13% 36% 25% 7%	800
	21st to end	Night	25% 11% 29% 28% 6% 1	765
April	1st to 10th	Night	21% 12% 34% 27% 6% 1	600
	11th to 20th	Night	26% 10% 30% 26% 7% 1	593
	21st to end	Night	22% 10% 32% 27% 8% 1	600
May	1st to 10th	Night	20% 7% 30% 32% 9% 1	600
	11th to 20th	Night	20% 6% 25% 35% 15% 1	591
	21st to end	Night	14% 4 24% 39% 18% 1	634
June	1st to 10th	Night	11% 5% 23% 42% 18% 1	570
	11th to 20th	Night	12% 4 27% 40% 15% 1	570
	21st to end	Night	10% 4 24% 39% 21% 1	570
July	1st to 10th	Night	8% 3 16% 41% 28% 4	555
	11th to 20th	Night	9% 3 17% 39% 28% 4	552
	21st to end	Night	8% 2 14% 45% 29% 2	624
August	1st to 10th	Night	8% 2 12% 47% 28% 4	567
	11th to 20th	Night	10% 3 15% 38% 30% 4	564
	21st to end	Night	10% 3 15% 39% 30% 3	627
September	1st to 10th	Night	12% 5% 16% 38% 25% 5%	570
	11th to 20th	Night	12% 5% 14% 36% 28% 3	746
	21st to end	Night	16% 7% 23% 31% 19% 4	760
October	1st to 10th	Night	19% 6% 23% 32% 19% 1	760
	11th to 20th	Night	26% 14% 26% 26% 8% 1	760
	21st to end	Night	31% 13% 28% 23% 6%	836
November	1st to 10th	Night	23% 12% 32% 23% 9% 1	780
	11th to 20th	Night	25% 19% 30% 21% 4 1	800
	21st to end	Night	28% 14% 31% 23% 4	800
December	1st to 10th	Night	26% 17% 35% 18% 3	940
	11th to 20th	Night	25% 17% 36% 19% 3	1000
	21st to end	Night	31% 16% 34% 17% 2	1100

Page generated at 2025-05-23 09:21:03. Version ac07

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