South Cushing
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the South Cushing clear sky chart from 2005-11-06 to 2024-01-13.

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	18% 7% 3 5% 5% 3 4 4 5% 7% 39%	74561
	Night	19% 8% 3 5% 5% 3 4 4 5% 7% 38%	75141
Transparency	Day	44% 6% 12% 22% 14% 2	74268
	Night	46% 6% 12% 21% 14% 2	74969
Seeing	Day	21% 12% 31% 26% 9% 2	14340
	Night	23% 12% 29% 25% 10% 1	23046

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	15% 8% 4 6% 6% 3 3 3 5% 7% 41%	1517
	11th to 20th	Day	21% 9% 3 6% 4 3 3 4 4 6% 37%	1456
	21st to end	Day	14% 9% 3 7% 4 2 4 3 4 6% 41%	1606
February	1st to 10th	Day	19% 10% 4 6% 5% 3 4 5% 5% 6% 35%	1620
	11th to 20th	Day	14% 9% 3 6% 5% 3 4 5% 6% 7% 38%	1708
	21st to end	Day	15% 10% 3 6% 6% 3 5% 5% 6% 6% 35%	1480
March	1st to 10th	Day	17% 7% 3 5% 4 3 5% 5% 5% 8% 38%	1797
	11th to 20th	Day	18% 6% 3 6% 4 3 4 3 5% 6% 43%	1973
	21st to end	Day	18% 9% 2 4 5% 2 5% 4 4 5% 41%	2181
April	1st to 10th	Day	20% 9% 3 5% 5% 3 4 4 4 7% 36%	2160
	11th to 20th	Day	18% 7% 2 5% 5% 3 4 4 5% 7% 40%	2259
	21st to end	Day	23% 7% 4 6% 5% 3 4 3 5% 6% 34%	2340
May	1st to 10th	Day	23% 8% 3 5% 6% 3 4 4 4 6% 33%	2340
	11th to 20th	Day	20% 7% 3 6% 4 3 4 4 5% 6% 39%	2301
	21st to end	Day	19% 7% 3 5% 5% 2 4 5% 6% 8% 34%	2698
June	1st to 10th	Day	22% 7% 3 6% 6% 3 4 5% 5% 7% 32%	2641
	11th to 20th	Day	19% 6% 3 5% 4 3 4 5% 5% 6% 39%	2700
	21st to end	Day	24% 7% 3 6% 5% 3 5% 4 5% 8% 31%	2623
July	1st to 10th	Day	17% 5% 2 6% 5% 3 4 5% 5% 9% 39%	2520
	11th to 20th	Day	15% 6% 3 5% 4 3 6% 5% 6% 9% 39%	2520
	21st to end	Day	13% 5% 3 5% 5% 3 6% 6% 6% 10% 38%	2709
August	1st to 10th	Day	13% 6% 3 4 4 3 4 6% 6% 9% 41%	2327
	11th to 20th	Day	14% 5% 2 5% 5% 4 5% 5% 7% 9% 40%	2304
	21st to end	Day	12% 5% 2 4 5% 3 4 5% 6% 8% 47%	2522
September	1st to 10th	Day	11% 7% 2 4 5% 3 4 4 5% 8% 47%	2085
	11th to 20th	Day	13% 5% 2 4 4 2 3 3 5% 7% 52%	1980
	21st to end	Day	18% 7% 2 4 4 2 4 4 3 7% 44%	1980
October	1st to 10th	Day	19% 6% 2 5% 5% 2 3 5% 5% 6% 42%	1957
	11th to 20th	Day	19% 6% 2 5% 5% 2 4 4 4 7% 43%	1772
	21st to end	Day	22% 8% 2 5% 4 2 4 3 3 6% 39%	1782
November	1st to 10th	Day	16% 7% 2 5% 5% 3 4 3 5% 6% 46%	1671
	11th to 20th	Day	21% 6% 1 4 4 2 3 4 3 7% 45%	1710
	21st to end	Day	20% 7% 3 5% 4 2 3 3 4 6% 43%	1588
December	1st to 10th	Day	23% 8% 3 5% 5% 2 4 4 3 5% 38%	1417
	11th to 20th	Day	23% 8% 3 5% 4 2 3 4 4 5% 40%	1668
	21st to end	Day	26% 10% 3 6% 5% 3 4 4 5% 5% 31%	2649
January	1st to 10th	Night	17% 9% 3 6% 4 3 4 4 5% 7% 39%	2649
	11th to 20th	Night	18% 12% 4 6% 6% 3 4 4 4 7% 31%	2549
	21st to end	Night	14% 10% 3 5% 4 3 4 4 5% 8% 40%	2750
February	1st to 10th	Night	19% 9% 3 5% 6% 3 5% 4 5% 5% 35%	2340
	11th to 20th	Night	15% 9% 4 7% 6% 3 4 4 4 6% 39%	2135
	21st to end	Night	15% 8% 4 6% 5% 3 5% 3 4 6% 41%	1776
March	1st to 10th	Night	15% 11% 3 5% 5% 2 5% 4 5% 5% 39%	2150
	11th to 20th	Night	18% 8% 3 5% 6% 3 5% 5% 5% 6% 36%	1984
	21st to end	Night	20% 7% 3 5% 4 2 3 3 4 6% 42%	2173
April	1st to 10th	Night	23% 8% 2 5% 6% 2 5% 3 5% 5% 35%	1800
	11th to 20th	Night	20% 6% 3 5% 4 3 5% 4 5% 7% 38%	1648
	21st to end	Night	24% 8% 3 5% 4 3 4 4 4 7% 33%	1620
May	1st to 10th	Night	22% 9% 4 6% 6% 3 4 5% 5% 6% 29%	1620
	11th to 20th	Night	22% 9% 2 5% 6% 4 5% 5% 5% 6% 31%	1593
	21st to end	Night	21% 10% 3 6% 4 2 5% 3 4 7% 34%	1589
June	1st to 10th	Night	24% 6% 2 6% 6% 4 5% 4 5% 7% 30%	1314
	11th to 20th	Night	19% 7% 3 5% 5% 3 4 5% 4 8% 37%	1260
	21st to end	Night	24% 10% 3 4 5% 3 5% 5% 5% 7% 30%	1329
July	1st to 10th	Night	19% 7% 3 5% 5% 3 5% 4 5% 9% 35%	1440
	11th to 20th	Night	19% 7% 2 5% 6% 3 5% 5% 6% 9% 34%	1440
	21st to end	Night	16% 7% 3 5% 5% 3 4 4 7% 9% 37%	1588
August	1st to 10th	Night	14% 7% 3 6% 5% 2 5% 5% 5% 8% 40%	1612
	11th to 20th	Night	15% 7% 3 7% 6% 4 6% 4 4 9% 35%	1596
	21st to end	Night	14% 6% 2 4 4 3 4 4 5% 8% 46%	1830
September	1st to 10th	Night	14% 5% 2 4 3 3 5% 5% 5% 7% 48%	1874
	11th to 20th	Night	16% 7% 2 3 3 2 3 3 3 6% 51%	1980
	21st to end	Night	17% 5% 2 4 4 3 4 3 4 6% 47%	1980
October	1st to 10th	Night	20% 6% 2 5% 5% 3 4 4 6% 7% 40%	2002
	11th to 20th	Night	18% 6% 2 5% 4 3 4 5% 5% 6% 43%	2186
	21st to end	Night	24% 8% 2 4 5% 2 3 3 4 7% 36%	2574
November	1st to 10th	Night	18% 5% 2 5% 4 2 3 4 5% 6% 44%	2407
	11th to 20th	Night	18% 6% 2 5% 4 2 4 5% 5% 5% 44%	2470
	21st to end	Night	18% 7% 2 5% 5% 3 3 4 5% 6% 42%	2588
December	1st to 10th	Night	23% 9% 3 5% 4 3 4 4 4 6% 35%	2759
	11th to 20th	Night	24% 6% 2 4 4 2 3 3 4 6% 42%	3531
	21st to end	Night	25% 9% 3 5% 5% 3 4 3 3 6% 35%	5005

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	46% 4 12% 23% 13% 1	1518
	11th to 20th	Day	49% 6% 14% 19% 10% 2	1456
	21st to end	Day	45% 4 13% 22% 15% 1	1606
February	1st to 10th	Day	50% 5% 13% 18% 12% 1	1620
	11th to 20th	Day	45% 6% 15% 18% 13% 3	1717
	21st to end	Day	48% 6% 10% 19% 12% 4	1480
March	1st to 10th	Day	44% 6% 15% 17% 13% 4	1800
	11th to 20th	Day	42% 5% 10% 23% 16% 5%	1973
	21st to end	Day	43% 6% 10% 17% 17% 6%	2181
April	1st to 10th	Day	48% 5% 10% 18% 15% 4	2160
	11th to 20th	Day	43% 7% 10% 23% 15% 3	2259
	21st to end	Day	51% 5% 8% 18% 15% 3	2340
May	1st to 10th	Day	51% 6% 9% 19% 14% 2	2340
	11th to 20th	Day	44% 6% 11% 21% 16% 2	2305
	21st to end	Day	47% 8% 13% 19% 11% 2	2698
June	1st to 10th	Day	51% 7% 13% 20% 9%	2641
	11th to 20th	Day	44% 7% 11% 21% 15% 2	2700
	21st to end	Day	51% 8% 12% 18% 10% 1	2623
July	1st to 10th	Day	43% 7% 12% 23% 14%	2450
	11th to 20th	Day	40% 8% 16% 24% 11% 1	2445
	21st to end	Day	39% 10% 15% 24% 11% 1	2557
August	1st to 10th	Day	37% 8% 18% 28% 9%	2314
	11th to 20th	Day	39% 9% 16% 23% 13%	2304
	21st to end	Day	33% 8% 15% 26% 17% 2	2522
September	1st to 10th	Day	35% 7% 14% 27% 17% 1	2085
	11th to 20th	Day	34% 5% 11% 26% 21% 3	1980
	21st to end	Day	41% 5% 9% 27% 16% 1	1980
October	1st to 10th	Day	41% 7% 12% 23% 15% 2	1957
	11th to 20th	Day	41% 7% 12% 29% 11% 1	1772
	21st to end	Day	47% 5% 11% 21% 14% 2	1782
November	1st to 10th	Day	39% 6% 13% 25% 15% 2	1671
	11th to 20th	Day	42% 4 11% 21% 19% 3	1710
	21st to end	Day	45% 4 18% 21% 11% 1	1588
December	1st to 10th	Day	50% 6% 12% 20% 11% 1	1417
	11th to 20th	Day	48% 5% 11% 20% 13% 4	1668
	21st to end	Day	55% 6% 11% 17% 8% 2	2649
January	1st to 10th	Night	45% 6% 15% 22% 11% 1	2649
	11th to 20th	Night	53% 7% 13% 16% 8% 1	2549
	21st to end	Night	44% 5% 14% 22% 14% 1	2750
February	1st to 10th	Night	51% 6% 12% 18% 11% 2	2340
	11th to 20th	Night	49% 5% 9% 20% 14% 2	2137
	21st to end	Night	45% 5% 10% 22% 14% 4	1776
March	1st to 10th	Night	48% 5% 8% 21% 16% 3	2160
	11th to 20th	Night	47% 7% 10% 18% 14% 4	1985
	21st to end	Night	44% 4 9% 20% 19% 4	2173
April	1st to 10th	Night	51% 4 8% 16% 17% 4	1800
	11th to 20th	Night	44% 6% 10% 23% 16% 1	1648
	21st to end	Night	52% 4 12% 17% 12% 3	1620
May	1st to 10th	Night	52% 7% 10% 17% 13% 1	1620
	11th to 20th	Night	52% 7% 10% 17% 13% 3	1594
	21st to end	Night	52% 5% 10% 18% 13% 2	1590
June	1st to 10th	Night	53% 7% 11% 20% 9% 1	1314
	11th to 20th	Night	46% 7% 13% 19% 14% 2	1260
	21st to end	Night	52% 8% 10% 19% 10% 1	1329
July	1st to 10th	Night	46% 7% 13% 20% 13% 1	1400
	11th to 20th	Night	46% 6% 14% 23% 10%	1392
	21st to end	Night	42% 7% 16% 23% 10% 1	1500
August	1st to 10th	Night	42% 8% 15% 26% 9% 1	1600
	11th to 20th	Night	45% 8% 15% 20% 13%	1596
	21st to end	Night	36% 8% 10% 27% 19% 1	1830
September	1st to 10th	Night	35% 7% 13% 28% 16% 1	1874
	11th to 20th	Night	37% 4 11% 26% 20% 2	1980
	21st to end	Night	38% 6% 9% 29% 16% 2	1980
October	1st to 10th	Night	44% 6% 11% 23% 14% 2	2002
	11th to 20th	Night	39% 6% 13% 28% 12% 1	2186
	21st to end	Night	49% 6% 10% 20% 14% 1	2574
November	1st to 10th	Night	42% 6% 12% 24% 15% 1	2407
	11th to 20th	Night	42% 5% 11% 23% 16% 2	2470
	21st to end	Night	44% 6% 16% 20% 13% 2	2588
December	1st to 10th	Night	51% 6% 11% 20% 11% 1	2759
	11th to 20th	Night	45% 5% 14% 20% 15% 1	3532
	21st to end	Night	51% 7% 12% 17% 12% 1	5005

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	26% 23% 31% 16% 5%	180
	11th to 20th	Day	27% 22% 27% 21% 2 1	164
	21st to end	Day	20% 17% 36% 23% 4	198
February	1st to 10th	Day	26% 23% 33% 16% 2	340
	11th to 20th	Day	23% 19% 41% 15% 2	398
	21st to end	Day	22% 18% 37% 18% 4	346
March	1st to 10th	Day	21% 20% 37% 19% 3	420
	11th to 20th	Day	20% 19% 39% 18% 4	420
	21st to end	Day	24% 18% 32% 17% 7% 2	462
April	1st to 10th	Day	25% 20% 34% 16% 5% 1	420
	11th to 20th	Day	23% 16% 35% 20% 6% 1	412
	21st to end	Day	28% 10% 35% 20% 6% 1	420
May	1st to 10th	Day	25% 13% 34% 21% 5% 2	423
	11th to 20th	Day	19% 9% 39% 25% 8% 1	447
	21st to end	Day	22% 10% 35% 25% 8% 1	485
June	1st to 10th	Day	24% 5% 31% 29% 9% 2	571
	11th to 20th	Day	21% 7% 30% 27% 13% 2	630
	21st to end	Day	22% 5% 26% 31% 14% 2	553
July	1st to 10th	Day	21% 4 26% 34% 13% 2	445
	11th to 20th	Day	17% 4 23% 39% 14% 3	444
	21st to end	Day	13% 2 25% 41% 15% 3	488
August	1st to 10th	Day	13% 4 25% 39% 17% 2	446
	11th to 20th	Day	16% 3 24% 36% 15% 6%	439
	21st to end	Day	15% 6% 24% 36% 16% 4	495
September	1st to 10th	Day	15% 5% 26% 33% 18% 3	450
	11th to 20th	Day	15% 9% 27% 30% 14% 5%	450
	21st to end	Day	18% 7% 30% 29% 11% 4	450
October	1st to 10th	Day	22% 12% 22% 29% 13% 3	438
	11th to 20th	Day	18% 12% 33% 26% 10% 2	360
	21st to end	Day	31% 10% 27% 26% 6%	396
November	1st to 10th	Day	18% 19% 28% 26% 7% 2	365
	11th to 20th	Day	25% 17% 31% 21% 5% 1	370
	21st to end	Day	25% 20% 30% 18% 7%	370
December	1st to 10th	Day	25% 16% 39% 15% 6%	267
	11th to 20th	Day	29% 19% 36% 12% 3 1	180
	21st to end	Day	28% 22% 34% 11% 5%	198
January	1st to 10th	Night	23% 19% 36% 19% 3	760
	11th to 20th	Night	28% 20% 34% 14% 4	729
	21st to end	Night	21% 22% 35% 18% 4	792
February	1st to 10th	Night	25% 19% 35% 18% 3	720
	11th to 20th	Night	20% 22% 37% 18% 3	703
	21st to end	Night	21% 15% 38% 20% 5%	592
March	1st to 10th	Night	24% 17% 36% 21% 2	720
	11th to 20th	Night	22% 15% 32% 22% 8%	720
	21st to end	Night	23% 14% 34% 23% 7% 1	792
April	1st to 10th	Night	29% 13% 33% 19% 5% 1	720
	11th to 20th	Night	23% 9% 34% 27% 7% 1	584
	21st to end	Night	30% 8% 26% 25% 9% 1	540
May	1st to 10th	Night	27% 4 29% 27% 11% 2	540
	11th to 20th	Night	26% 4 31% 29% 8% 1	532
	21st to end	Night	26% 4 22% 33% 14% 1	428
June	1st to 10th	Night	28% 4 20% 31% 15% 2	360
	11th to 20th	Night	20% 5% 19% 39% 16% 1	360
	21st to end	Night	30% 3 16% 38% 13%	360
July	1st to 10th	Night	22% 4 14% 39% 20% 1	350
	11th to 20th	Night	21% 2 17% 37% 20% 3	348
	21st to end	Night	18% 3 17% 37% 23% 1	408
August	1st to 10th	Night	18% 2 17% 42% 20% 1	538
	11th to 20th	Night	17% 3 16% 42% 20% 2	532
	21st to end	Night	15% 4 18% 37% 24% 2	642
September	1st to 10th	Night	15% 3 22% 35% 23% 2	720
	11th to 20th	Night	20% 5% 23% 28% 19% 5%	720
	21st to end	Night	18% 5% 26% 30% 18% 3	720
October	1st to 10th	Night	23% 7% 22% 31% 16% 1	720
	11th to 20th	Night	19% 11% 29% 28% 11% 2	720
	21st to end	Night	28% 13% 30% 23% 6%	792
November	1st to 10th	Night	21% 11% 32% 25% 8% 2	740
	11th to 20th	Night	22% 17% 34% 20% 7% 1	760
	21st to end	Night	21% 22% 30% 20% 7%	816
December	1st to 10th	Night	28% 14% 38% 13% 6%	850
	11th to 20th	Night	25% 21% 33% 18% 3	850
	21st to end	Night	29% 17% 35% 16% 3	868

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