Seminole State College Star Range
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Seminole State College Star Range clear sky chart from 2005-11-06 to 2025-03-12.

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	8% 6% 2 7% 6% 6% 6% 5% 7% 9% 37%	109112
	Night	9% 6% 2 6% 5% 5% 5% 4 7% 9% 43%	109900
Transparency	Day	38% 10% 16% 19% 13% 4	112838
	Night	36% 9% 16% 20% 13% 5%	114300
Seeing	Day	9% 6% 19% 25% 22% 19%	16064
	Night	9% 4 18% 32% 29% 8%	26222

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	9% 5% 1 4 4 4 4 3 5% 7% 54%	4056
	11th to 20th	Day	18% 10% 3 8% 6% 5% 5% 3 5% 6% 31%	4060
	21st to end	Day	15% 6% 2 6% 4 4 3 3 6% 8% 44%	4484
February	1st to 10th	Day	12% 7% 2 6% 5% 4 5% 4 6% 7% 42%	2000
	11th to 20th	Day	7% 5% 2 7% 5% 4 4 3 5% 6% 51%	1948
	21st to end	Day	10% 5% 2 6% 5% 4 5% 4 6% 6% 47%	1796
March	1st to 10th	Day	7% 7% 3 9% 6% 5% 6% 5% 6% 9% 36%	3545
	11th to 20th	Day	6% 3 1 5% 5% 4 4 3 7% 11% 50%	3491
	21st to end	Day	11% 5% 2 6% 5% 5% 4 5% 6% 8% 45%	3815
April	1st to 10th	Day	7% 5% 2 5% 4 5% 6% 4 7% 9% 47%	2090
	11th to 20th	Day	9% 5% 2 6% 6% 5% 6% 5% 7% 8% 40%	2141
	21st to end	Day	5% 4 2 5% 4 5% 6% 5% 7% 10% 48%	2280
May	1st to 10th	Day	4 3 1 4 4 4 5% 5% 7% 10% 53%	3923
	11th to 20th	Day	10% 5% 2 7% 6% 6% 6% 5% 8% 10% 35%	4081
	21st to end	Day	4 4 2 5% 5% 5% 5% 5% 7% 10% 49%	4476
June	1st to 10th	Day	11% 8% 3 9% 7% 7% 8% 6% 8% 9% 25%	2470
	11th to 20th	Day	6% 6% 3 9% 8% 8% 9% 6% 8% 10% 28%	2470
	21st to end	Day	9% 7% 3 8% 8% 7% 6% 7% 7% 9% 27%	2470
July	1st to 10th	Day	6% 6% 3 9% 7% 7% 8% 7% 9% 13% 24%	4120
	11th to 20th	Day	5% 5% 3 7% 8% 8% 8% 6% 9% 13% 27%	4120
	21st to end	Day	5% 5% 2 9% 7% 8% 8% 7% 11% 13% 25%	4466
August	1st to 10th	Day	5% 7% 3 10% 7% 8% 8% 6% 9% 12% 26%	4104
	11th to 20th	Day	4 4 2 8% 6% 7% 8% 6% 9% 13% 34%	3894
	21st to end	Day	8% 6% 3 9% 7% 7% 8% 6% 9% 12% 25%	3865
September	1st to 10th	Day	8% 8% 3 10% 8% 8% 8% 7% 9% 9% 22%	2090
	11th to 20th	Day	10% 8% 4 9% 7% 8% 8% 5% 9% 10% 23%	2090
	21st to end	Day	10% 8% 3 10% 5% 6% 7% 4 9% 10% 28%	2090
October	1st to 10th	Day	13% 6% 2 10% 6% 7% 6% 5% 6% 8% 31%	2032
	11th to 20th	Day	7% 6% 2 6% 6% 5% 5% 4 7% 8% 44%	1900
	21st to end	Day	8% 4 1 6% 5% 5% 5% 4 7% 8% 46%	2090
November	1st to 10th	Day	7% 5% 2 8% 6% 5% 6% 5% 7% 8% 41%	1957
	11th to 20th	Day	9% 6% 2 7% 6% 6% 5% 5% 6% 8% 40%	2000
	21st to end	Day	10% 7% 2 7% 5% 4 5% 4 6% 7% 42%	1929
December	1st to 10th	Day	5% 4 2 5% 3 4 4 3 6% 9% 56%	2930
	11th to 20th	Day	9% 7% 3 8% 5% 6% 6% 5% 7% 8% 36%	3373
	21st to end	Day	10% 8% 3 8% 5% 5% 5% 5% 6% 8% 38%	4466
January	1st to 10th	Night	9% 5% 2 5% 3 4 4 3 5% 7% 54%	5889
	11th to 20th	Night	18% 10% 3 8% 5% 5% 4 4 6% 7% 31%	5900
	21st to end	Night	15% 6% 2 6% 4 3 4 3 6% 8% 43%	6467
February	1st to 10th	Night	12% 7% 2 6% 4 3 5% 3 5% 7% 46%	2400
	11th to 20th	Night	10% 5% 2 5% 4 4 5% 4 5% 7% 49%	2338
	21st to end	Night	8% 4 2 5% 3 4 4 3 6% 8% 53%	1831
March	1st to 10th	Night	14% 8% 3 8% 5% 4 4 3 5% 7% 39%	3528
	11th to 20th	Night	5% 4 2 4 3 4 4 5% 8% 12% 50%	3498
	21st to end	Night	10% 6% 2 7% 5% 4 4 3 5% 7% 47%	3817
April	1st to 10th	Night	6% 5% 1 5% 3 3 4 4 6% 9% 54%	2090
	11th to 20th	Night	6% 5% 2 6% 4 5% 4 4 7% 7% 49%	1984
	21st to end	Night	5% 4 1 5% 5% 4 5% 4 6% 7% 55%	1900
May	1st to 10th	Night	3 2 1 4 3 4 4 4 6% 10% 60%	2985
	11th to 20th	Night	6% 5% 2 6% 4 5% 6% 5% 8% 10% 43%	2812
	21st to end	Night	4 3 2 4 4 4 4 4 6% 9% 57%	3079
June	1st to 10th	Night	9% 5% 3 8% 6% 6% 5% 5% 9% 11% 33%	1710
	11th to 20th	Night	5% 6% 4 7% 6% 7% 6% 6% 9% 11% 33%	1710
	21st to end	Night	7% 6% 3 9% 7% 5% 6% 5% 8% 11% 33%	1710
July	1st to 10th	Night	6% 6% 3 7% 6% 6% 6% 6% 8% 13% 35%	2840
	11th to 20th	Night	4 5% 2 7% 6% 6% 7% 7% 10% 15% 30%	2840
	21st to end	Night	6% 6% 3 10% 8% 8% 7% 6% 9% 13% 26%	3087
August	1st to 10th	Night	4 5% 3 9% 6% 6% 7% 4 8% 13% 35%	2825
	11th to 20th	Night	4 4 2 7% 5% 6% 6% 5% 9% 13% 39%	2900
	21st to end	Night	8% 6% 2 7% 5% 6% 6% 5% 8% 13% 32%	3785
September	1st to 10th	Night	8% 6% 2 8% 6% 7% 7% 6% 8% 11% 30%	2090
	11th to 20th	Night	9% 9% 3 9% 7% 6% 7% 5% 7% 9% 28%	2090
	21st to end	Night	9% 6% 2 8% 6% 5% 7% 5% 8% 10% 35%	2090
October	1st to 10th	Night	9% 7% 3 7% 5% 5% 6% 4 6% 9% 38%	2147
	11th to 20th	Night	6% 5% 3 5% 4 4 5% 3 6% 9% 51%	2280
	21st to end	Night	8% 4 2 6% 4 4 5% 4 6% 9% 49%	2508
November	1st to 10th	Night	9% 5% 2 6% 4 5% 5% 4 8% 8% 44%	2341
	11th to 20th	Night	9% 6% 2 6% 5% 5% 4 5% 6% 8% 45%	2400
	21st to end	Night	9% 6% 2 7% 5% 5% 5% 4 6% 8% 43%	2467
December	1st to 10th	Night	4 3 2 5% 4 4 4 3 6% 8% 58%	4250
	11th to 20th	Night	11% 7% 2 6% 5% 4 4 4 5% 6% 44%	4822
	21st to end	Night	12% 7% 3 8% 5% 5% 5% 4 6% 7% 39%	6490

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	30% 4 10% 16% 27% 12%	4057
	11th to 20th	Day	53% 5% 4 16% 15% 6%	4060
	21st to end	Day	38% 5% 8% 26% 16% 8%	4484
February	1st to 10th	Day	39% 7% 10% 15% 21% 8%	2000
	11th to 20th	Day	33% 5% 9% 21% 22% 11%	1958
	21st to end	Day	35% 6% 11% 17% 23% 9%	1796
March	1st to 10th	Day	42% 9% 13% 18% 14% 5%	3545
	11th to 20th	Day	28% 6% 13% 27% 21% 5%	3491
	21st to end	Day	35% 6% 11% 26% 15% 7%	3815
April	1st to 10th	Day	32% 7% 12% 23% 17% 8%	2090
	11th to 20th	Day	37% 8% 11% 19% 19% 6%	2141
	21st to end	Day	29% 8% 12% 21% 22% 9%	2280
May	1st to 10th	Day	20% 10% 17% 30% 18% 5%	3958
	11th to 20th	Day	39% 10% 17% 22% 10% 1	4085
	21st to end	Day	27% 9% 14% 33% 16% 1	4489
June	1st to 10th	Day	49% 12% 18% 17% 4	2470
	11th to 20th	Day	46% 13% 20% 19% 2	2470
	21st to end	Day	48% 13% 21% 14% 4	2470
July	1st to 10th	Day	44% 17% 24% 13% 2	4055
	11th to 20th	Day	42% 19% 30% 9%	4051
	21st to end	Day	42% 19% 28% 10% 1	4324
August	1st to 10th	Day	44% 17% 27% 11% 2	4091
	11th to 20th	Day	36% 16% 25% 18% 6%	3933
	21st to end	Day	45% 15% 24% 15% 2	3865
September	1st to 10th	Day	52% 16% 18% 9% 5%	2090
	11th to 20th	Day	51% 13% 20% 12% 3	2090
	21st to end	Day	46% 12% 16% 14% 10% 3	2090
October	1st to 10th	Day	55% 10% 13% 10% 8% 4	3370
	11th to 20th	Day	30% 6% 10% 23% 25% 6%	3140
	21st to end	Day	26% 5% 8% 23% 31% 6%	3428
November	1st to 10th	Day	36% 8% 10% 18% 19% 7%	1957
	11th to 20th	Day	40% 7% 9% 20% 18% 7%	2000
	21st to end	Day	39% 6% 9% 20% 18% 7%	1929
December	1st to 10th	Day	25% 6% 16% 27% 16% 9%	2930
	11th to 20th	Day	40% 8% 13% 15% 18% 6%	3370
	21st to end	Day	42% 6% 12% 20% 15% 5%	4466
January	1st to 10th	Night	30% 4 8% 19% 27% 12%	5889
	11th to 20th	Night	52% 5% 9% 16% 14% 4	5900
	21st to end	Night	39% 7% 9% 22% 15% 8%	6467
February	1st to 10th	Night	37% 6% 11% 18% 17% 12%	2400
	11th to 20th	Night	33% 7% 11% 21% 19% 10%	2339
	21st to end	Night	28% 6% 14% 20% 24% 8%	1831
March	1st to 10th	Night	43% 7% 13% 18% 14% 5%	3528
	11th to 20th	Night	23% 9% 20% 28% 15% 5%	3498
	21st to end	Night	35% 7% 11% 21% 20% 6%	3817
April	1st to 10th	Night	26% 7% 18% 25% 15% 9%	2090
	11th to 20th	Night	32% 7% 12% 25% 18% 6%	1984
	21st to end	Night	27% 6% 14% 26% 20% 7%	1900
May	1st to 10th	Night	17% 10% 20% 34% 15% 5%	3015
	11th to 20th	Night	31% 11% 23% 25% 9% 1	2813
	21st to end	Night	22% 9% 16% 36% 17% 1	3087
June	1st to 10th	Night	42% 10% 22% 22% 4	1710
	11th to 20th	Night	39% 14% 22% 23% 2	1710
	21st to end	Night	41% 12% 24% 17% 5% 1	1710
July	1st to 10th	Night	35% 15% 31% 16% 1	2795
	11th to 20th	Night	36% 18% 37% 8% 1	2786
	21st to end	Night	44% 16% 27% 12% 1	2988
August	1st to 10th	Night	38% 13% 35% 11% 2	2814
	11th to 20th	Night	30% 15% 30% 19% 6%	2927
	21st to end	Night	40% 14% 30% 14% 2	3785
September	1st to 10th	Night	43% 19% 20% 14% 5%	2090
	11th to 20th	Night	48% 12% 22% 15% 3	2090
	21st to end	Night	40% 11% 18% 19% 9% 2	2090
October	1st to 10th	Night	54% 10% 13% 13% 7% 3	3576
	11th to 20th	Night	29% 7% 10% 26% 24% 5%	3779
	21st to end	Night	28% 6% 10% 21% 28% 6%	4120
November	1st to 10th	Night	34% 8% 12% 21% 18% 8%	2341
	11th to 20th	Night	36% 7% 11% 20% 19% 8%	2400
	21st to end	Night	36% 7% 11% 20% 19% 7%	2467
December	1st to 10th	Night	25% 5% 16% 30% 11% 13%	4250
	11th to 20th	Night	38% 8% 14% 18% 14% 8%	4824
	21st to end	Night	42% 8% 12% 21% 12% 5%	6490

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	13% 10% 44% 23% 8% 2	300
	11th to 20th	Day	9% 14% 38% 25% 9% 5%	300
	21st to end	Day	17% 14% 42% 21% 6%	330
February	1st to 10th	Day	13% 11% 33% 27% 14% 3	300
	11th to 20th	Day	13% 8% 36% 29% 10% 4	300
	21st to end	Day	10% 9% 27% 31% 21% 2	395
March	1st to 10th	Day	7% 11% 35% 32% 14% 2	500
	11th to 20th	Day	10% 7% 30% 30% 19% 4	464
	21st to end	Day	8% 8% 28% 31% 21% 4	506
April	1st to 10th	Day	9% 7% 33% 29% 17% 4	460
	11th to 20th	Day	9% 10% 25% 29% 20% 8%	452
	21st to end	Day	6% 4 25% 33% 21% 12%	460
May	1st to 10th	Day	7% 3 20% 31% 25% 14%	463
	11th to 20th	Day	9% 5% 16% 29% 25% 16%	487
	21st to end	Day	6% 2 11% 23% 29% 28%	529
June	1st to 10th	Day	12% 2 11% 25% 25% 24%	490
	11th to 20th	Day	6% 3 10% 23% 25% 33%	490
	21st to end	Day	8% 2 5% 16% 28% 41%	490
July	1st to 10th	Day	5% 3 4 11% 27% 49%	485
	11th to 20th	Day	6% 1 2 11% 32% 48%	484
	21st to end	Day	8% 1 4 16% 25% 47%	532
August	1st to 10th	Day	5% 2 7% 17% 27% 42%	486
	11th to 20th	Day	5% 4 11% 26% 53%	479
	21st to end	Day	10% 2 6% 17% 28% 37%	539
September	1st to 10th	Day	10% 3 6% 15% 27% 39%	490
	11th to 20th	Day	10% 3 9% 22% 27% 29%	490
	21st to end	Day	10% 3 8% 25% 28% 26%	490
October	1st to 10th	Day	16% 3 16% 30% 26% 8%	490
	11th to 20th	Day	6% 6% 20% 28% 31% 9%	490
	21st to end	Day	7% 5% 20% 38% 23% 7%	539
November	1st to 10th	Day	9% 8% 20% 31% 27% 6%	495
	11th to 20th	Day	12% 7% 24% 35% 18% 5%	500
	21st to end	Day	11% 6% 26% 35% 19% 3	429
December	1st to 10th	Day	6% 10% 37% 29% 12% 5%	300
	11th to 20th	Day	11% 12% 29% 29% 17% 1	300
	21st to end	Day	9% 11% 29% 33% 15% 2	330
January	1st to 10th	Night	12% 8% 30% 37% 13% 1	800
	11th to 20th	Night	11% 7% 28% 39% 15% 1	800
	21st to end	Night	15% 9% 33% 35% 9%	880
February	1st to 10th	Night	14% 7% 26% 36% 16% 1	800
	11th to 20th	Night	11% 6% 32% 37% 13% 1	783
	21st to end	Night	9% 6% 32% 43% 10%	660
March	1st to 10th	Night	5% 6% 33% 41% 13% 1	800
	11th to 20th	Night	9% 6% 25% 42% 18% 1	767
	21st to end	Night	7% 7% 29% 39% 17% 1	836
April	1st to 10th	Night	7% 5% 28% 42% 17% 1	760
	11th to 20th	Night	7% 7% 24% 42% 20% 1	751
	21st to end	Night	6% 4 20% 46% 23% 2	760
May	1st to 10th	Night	6% 3 14% 49% 25% 3	680
	11th to 20th	Night	7% 2 12% 35% 38% 5%	561
	21st to end	Night	8% 2 6% 28% 47% 9%	617
June	1st to 10th	Night	11% 2 7% 28% 45% 7%	570
	11th to 20th	Night	7% 1 5% 21% 44% 21%	570
	21st to end	Night	8% 2 5% 15% 49% 21%	570
July	1st to 10th	Night	9% 2 4 11% 48% 27%	555
	11th to 20th	Night	7% 1 2 9% 52% 29%	552
	21st to end	Night	5% 1 3 13% 50% 29%	624
August	1st to 10th	Night	6% 1 3 13% 50% 27%	567
	11th to 20th	Night	3 1 3 12% 49% 32%	627
	21st to end	Night	12% 1 6% 17% 40% 23%	836
September	1st to 10th	Night	9% 2 5% 17% 45% 22%	760
	11th to 20th	Night	10% 3 6% 21% 45% 14%	760
	21st to end	Night	11% 1 7% 23% 43% 14%	760
October	1st to 10th	Night	13% 3 12% 32% 32% 7%	760
	11th to 20th	Night	7% 4 13% 33% 38% 6%	760
	21st to end	Night	10% 2 14% 39% 31% 4	836
November	1st to 10th	Night	9% 4 18% 37% 30% 3	780
	11th to 20th	Night	10% 5% 19% 40% 23% 2	800
	21st to end	Night	10% 4 23% 41% 20% 2	800
December	1st to 10th	Night	7% 4 25% 37% 25% 3	800
	11th to 20th	Night	12% 7% 22% 37% 21% 2	800
	21st to end	Night	11% 5% 26% 37% 20% 1	880

Page generated at 2025-03-09 08:08:45. Version ac07

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