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 2026-07-31.

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	7% 5% 2 7% 6% 6% 6% 5% 7% 10% 38%	137834
	Night	8% 6% 2 6% 5% 5% 5% 4 7% 9% 43%	135194
Transparency	Day	37% 10% 16% 20% 13% 5%	141516
	Night	35% 9% 17% 21% 13% 6%	139571
Seeing	Day	8% 6% 19% 26% 22% 18%	18001
	Night	9% 4 18% 32% 29% 8%	28056

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	7% 5% 2 5% 4 4 4 3 6% 7% 54%	5258
	11th to 20th	Day	17% 9% 3 8% 5% 5% 5% 4 5% 6% 33%	5280
	21st to end	Day	12% 6% 2 6% 4 4 4 4 6% 7% 46%	5798
February	1st to 10th	Day	12% 6% 2 6% 5% 4 5% 4 5% 7% 44%	2100
	11th to 20th	Day	7% 5% 2 6% 5% 4 4 4 5% 6% 51%	2048
	21st to end	Day	10% 5% 2 6% 5% 4 5% 4 6% 6% 47%	1883
March	1st to 10th	Day	7% 6% 2 7% 5% 5% 5% 5% 6% 10% 41%	5045
	11th to 20th	Day	4 3 1 5% 4 3 3 3 6% 9% 59%	5090
	21st to end	Day	9% 5% 2 6% 5% 5% 4 5% 7% 9% 44%	5586
April	1st to 10th	Day	8% 5% 2 5% 4 5% 6% 4 6% 9% 47%	2310
	11th to 20th	Day	8% 5% 2 6% 6% 5% 6% 5% 6% 8% 44%	2369
	21st to end	Day	4 4 2 5% 4 5% 6% 5% 7% 10% 48%	2520
May	1st to 10th	Day	4 3 2 6% 5% 5% 6% 5% 8% 12% 44%	7317
	11th to 20th	Day	9% 5% 2 6% 5% 5% 5% 4 6% 10% 42%	7626
	21st to end	Day	4 4 2 6% 6% 7% 7% 6% 9% 13% 38%	8391
June	1st to 10th	Day	10% 7% 3 9% 7% 7% 8% 6% 8% 9% 25%	2730
	11th to 20th	Day	6% 6% 3 9% 8% 9% 9% 6% 8% 10% 27%	2730
	21st to end	Day	8% 7% 3 8% 8% 7% 7% 7% 8% 10% 27%	2730
July	1st to 10th	Day	7% 7% 3 10% 7% 8% 8% 7% 10% 14% 19%	6030
	11th to 20th	Day	4 5% 2 7% 7% 8% 9% 6% 9% 13% 29%	6030
	21st to end	Day	4 4 2 7% 6% 7% 7% 6% 10% 12% 33%	6554
August	1st to 10th	Day	5% 7% 3 10% 7% 8% 9% 6% 9% 12% 25%	4234
	11th to 20th	Day	4 4 2 8% 6% 7% 8% 6% 9% 13% 34%	4019
	21st to end	Day	8% 6% 3 9% 7% 7% 8% 6% 9% 12% 24%	3987
September	1st to 10th	Day	8% 8% 3 10% 8% 8% 8% 7% 9% 9% 21%	2200
	11th to 20th	Day	10% 8% 4 9% 7% 8% 8% 5% 9% 10% 23%	2200
	21st to end	Day	10% 8% 3 10% 6% 6% 6% 5% 9% 10% 28%	2200
October	1st to 10th	Day	12% 6% 2 10% 6% 7% 6% 5% 7% 9% 30%	2139
	11th to 20th	Day	7% 5% 2 6% 6% 5% 5% 4 7% 8% 45%	2000
	21st to end	Day	8% 4 1 6% 5% 5% 5% 4 7% 7% 47%	2200
November	1st to 10th	Day	7% 5% 2 8% 6% 5% 6% 5% 7% 8% 42%	2057
	11th to 20th	Day	8% 6% 2 7% 5% 6% 5% 5% 6% 7% 43%	2100
	21st to end	Day	10% 7% 2 6% 5% 4 5% 4 6% 8% 43%	2025
December	1st to 10th	Day	6% 4 2 5% 3 3 4 3 6% 9% 55%	3020
	11th to 20th	Day	9% 7% 3 8% 5% 6% 6% 5% 7% 8% 36%	3463
	21st to end	Day	9% 7% 3 8% 5% 5% 5% 4 6% 8% 39%	4565
January	1st to 10th	Night	7% 5% 2 5% 3 3 4 3 5% 7% 57%	7635
	11th to 20th	Night	15% 10% 3 8% 5% 5% 5% 4 5% 6% 33%	7680
	21st to end	Night	13% 6% 2 6% 4 3 4 3 6% 8% 46%	8364
February	1st to 10th	Night	11% 7% 2 6% 4 3 4 3 5% 7% 48%	2520
	11th to 20th	Night	10% 5% 2 6% 4 4 5% 3 5% 7% 49%	2458
	21st to end	Night	8% 4 2 5% 3 4 4 3 6% 7% 54%	1920
March	1st to 10th	Night	12% 6% 3 6% 4 4 4 3 5% 7% 45%	5028
	11th to 20th	Night	5% 4 1 3 3 3 4 4 6% 10% 56%	5090
	21st to end	Night	8% 5% 2 6% 4 4 4 3 6% 8% 49%	5588
April	1st to 10th	Night	7% 5% 1 5% 3 3 4 4 6% 9% 52%	2310
	11th to 20th	Night	6% 5% 2 6% 4 5% 4 4 6% 7% 52%	2196
	21st to end	Night	5% 4 1 5% 5% 4 5% 4 6% 7% 54%	2100
May	1st to 10th	Night	5% 4 2 6% 5% 4 5% 4 7% 9% 49%	5577
	11th to 20th	Night	7% 7% 3 7% 4 4 5% 4 6% 8% 46%	5234
	21st to end	Night	4 4 2 6% 5% 5% 6% 5% 8% 12% 43%	5761
June	1st to 10th	Night	9% 6% 3 8% 6% 6% 5% 5% 9% 11% 33%	1890
	11th to 20th	Night	5% 6% 3 8% 7% 7% 6% 6% 9% 11% 31%	1890
	21st to end	Night	7% 6% 3 9% 7% 5% 6% 5% 7% 11% 34%	1890
July	1st to 10th	Night	8% 7% 3 9% 6% 6% 7% 6% 9% 12% 26%	4148
	11th to 20th	Night	3 5% 2 7% 6% 6% 7% 6% 9% 14% 35%	4147
	21st to end	Night	5% 5% 2 8% 6% 6% 7% 5% 8% 12% 36%	4517
August	1st to 10th	Night	4 5% 3 9% 6% 6% 7% 4 8% 13% 34%	2915
	11th to 20th	Night	4 4 2 7% 5% 6% 6% 5% 9% 13% 39%	2994
	21st to end	Night	8% 6% 3 7% 6% 6% 6% 6% 9% 13% 32%	3905
September	1st to 10th	Night	8% 6% 2 8% 6% 7% 7% 6% 8% 11% 29%	2200
	11th to 20th	Night	9% 9% 3 9% 7% 6% 6% 5% 8% 9% 29%	2200
	21st to end	Night	9% 6% 3 8% 6% 5% 7% 5% 8% 10% 35%	2200
October	1st to 10th	Night	9% 7% 3 7% 5% 5% 6% 5% 6% 9% 38%	2260
	11th to 20th	Night	6% 5% 3 5% 4 4 4 3 5% 9% 51%	2400
	21st to end	Night	8% 5% 2 6% 4 4 5% 4 6% 9% 50%	2640
November	1st to 10th	Night	9% 5% 2 6% 4 5% 4 4 7% 8% 45%	2461
	11th to 20th	Night	9% 5% 2 6% 5% 5% 4 4 5% 8% 47%	2520
	21st to end	Night	8% 6% 2 7% 5% 5% 5% 4 7% 8% 44%	2591
December	1st to 10th	Night	5% 3 2 5% 4 4 4 3 6% 8% 57%	4380
	11th to 20th	Night	10% 7% 2 7% 5% 4 4 4 5% 6% 44%	4952
	21st to end	Night	12% 7% 3 8% 5% 5% 5% 4 5% 7% 40%	6633

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	29% 5% 12% 20% 24% 10%	5259
	11th to 20th	Day	51% 5% 6% 15% 14% 10%	5280
	21st to end	Day	36% 6% 9% 25% 16% 9%	5798
February	1st to 10th	Day	38% 7% 10% 15% 21% 10%	2100
	11th to 20th	Day	33% 5% 9% 22% 22% 10%	2058
	21st to end	Day	35% 5% 11% 17% 23% 9%	1883
March	1st to 10th	Day	36% 8% 12% 18% 20% 6%	5045
	11th to 20th	Day	23% 5% 10% 24% 22% 17%	5090
	21st to end	Day	34% 6% 10% 26% 16% 8%	5586
April	1st to 10th	Day	32% 7% 12% 24% 18% 8%	2310
	11th to 20th	Day	35% 7% 11% 18% 22% 8%	2369
	21st to end	Day	28% 8% 13% 22% 22% 8%	2520
May	1st to 10th	Day	27% 10% 20% 27% 14% 3	7349
	11th to 20th	Day	34% 9% 16% 29% 11% 1	7630
	21st to end	Day	32% 13% 20% 25% 10%	8405
June	1st to 10th	Day	49% 12% 17% 16% 5%	2730
	11th to 20th	Day	46% 14% 21% 18% 2	2730
	21st to end	Day	47% 13% 21% 15% 4	2730
July	1st to 10th	Day	47% 19% 24% 10% 1	5965
	11th to 20th	Day	39% 18% 30% 12% 1	5961
	21st to end	Day	35% 16% 26% 21% 1	6370
August	1st to 10th	Day	44% 17% 27% 11% 2	4221
	11th to 20th	Day	35% 16% 25% 18% 6%	4058
	21st to end	Day	45% 16% 24% 14% 2	3987
September	1st to 10th	Day	52% 17% 17% 9% 4	2200
	11th to 20th	Day	51% 13% 20% 13% 3	2200
	21st to end	Day	46% 12% 16% 14% 10% 2	2200
October	1st to 10th	Day	54% 10% 13% 11% 8% 4	3477
	11th to 20th	Day	29% 6% 10% 23% 26% 6%	3240
	21st to end	Day	26% 6% 8% 24% 30% 7%	3538
November	1st to 10th	Day	36% 8% 10% 18% 20% 7%	2057
	11th to 20th	Day	38% 6% 9% 20% 19% 8%	2100
	21st to end	Day	38% 6% 9% 21% 18% 7%	2025
December	1st to 10th	Day	26% 6% 16% 27% 16% 9%	3020
	11th to 20th	Day	40% 8% 13% 15% 18% 7%	3460
	21st to end	Day	41% 6% 12% 21% 16% 5%	4565
January	1st to 10th	Night	27% 4 11% 24% 23% 10%	7636
	11th to 20th	Night	50% 5% 9% 15% 13% 8%	7680
	21st to end	Night	35% 6% 12% 23% 13% 11%	8364
February	1st to 10th	Night	35% 6% 10% 18% 18% 13%	2520
	11th to 20th	Night	33% 7% 11% 22% 18% 9%	2459
	21st to end	Night	28% 6% 14% 19% 24% 8%	1920
March	1st to 10th	Night	37% 6% 12% 19% 19% 7%	5028
	11th to 20th	Night	22% 7% 15% 24% 16% 16%	5090
	21st to end	Night	32% 7% 12% 23% 20% 5%	5588
April	1st to 10th	Night	27% 7% 18% 25% 15% 8%	2310
	11th to 20th	Night	29% 7% 11% 24% 21% 7%	2196
	21st to end	Night	27% 6% 14% 27% 20% 7%	2100
May	1st to 10th	Night	28% 10% 20% 28% 12% 3	5607
	11th to 20th	Night	34% 9% 21% 27% 9% 1	5235
	21st to end	Night	31% 12% 22% 25% 10%	5771
June	1st to 10th	Night	42% 10% 21% 21% 5%	1890
	11th to 20th	Night	40% 14% 22% 21% 2	1890
	21st to end	Night	41% 13% 24% 18% 4 1	1890
July	1st to 10th	Night	45% 16% 26% 11% 1	4105
	11th to 20th	Night	33% 17% 38% 11% 1	4096
	21st to end	Night	36% 14% 26% 22% 1	4387
August	1st to 10th	Night	40% 13% 34% 11% 2	2904
	11th to 20th	Night	30% 15% 30% 19% 6%	3021
	21st to end	Night	40% 15% 29% 14% 2	3905
September	1st to 10th	Night	44% 19% 20% 13% 5%	2200
	11th to 20th	Night	48% 12% 21% 16% 3	2200
	21st to end	Night	41% 12% 18% 19% 9% 2	2200
October	1st to 10th	Night	53% 10% 13% 14% 7% 3	3689
	11th to 20th	Night	28% 7% 10% 25% 25% 5%	3899
	21st to end	Night	28% 6% 10% 21% 28% 6%	4252
November	1st to 10th	Night	34% 8% 12% 20% 18% 9%	2461
	11th to 20th	Night	34% 7% 11% 20% 20% 8%	2520
	21st to end	Night	36% 7% 11% 21% 18% 7%	2591
December	1st to 10th	Night	26% 5% 16% 30% 11% 12%	4380
	11th to 20th	Night	37% 8% 14% 18% 14% 8%	4954
	21st to end	Night	41% 8% 12% 21% 13% 5%	6633

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% 10% 42% 24% 10% 2	330
	11th to 20th	Day	9% 14% 38% 25% 9% 5%	330
	21st to end	Day	15% 15% 44% 20% 6%	363
February	1st to 10th	Day	12% 12% 33% 27% 13% 2	330
	11th to 20th	Day	12% 9% 37% 29% 9% 3	330
	21st to end	Day	10% 10% 28% 31% 19% 2	426
March	1st to 10th	Day	6% 10% 34% 33% 15% 2	540
	11th to 20th	Day	10% 9% 31% 29% 17% 4	540
	21st to end	Day	7% 8% 28% 33% 20% 4	594
April	1st to 10th	Day	9% 8% 31% 31% 17% 4	540
	11th to 20th	Day	8% 9% 25% 29% 20% 9%	532
	21st to end	Day	5% 3 25% 33% 21% 12%	540
May	1st to 10th	Day	7% 4 24% 30% 23% 12%	543
	11th to 20th	Day	10% 5% 18% 29% 23% 15%	567
	21st to end	Day	6% 3 12% 24% 29% 25%	617
June	1st to 10th	Day	11% 4 13% 25% 25% 22%	570
	11th to 20th	Day	5% 4 10% 22% 26% 32%	570
	21st to end	Day	7% 2 5% 17% 29% 40%	570
July	1st to 10th	Day	5% 3 4 11% 28% 48%	565
	11th to 20th	Day	6% 1 3 15% 31% 44%	564
	21st to end	Day	7% 2 4 18% 25% 44%	616
August	1st to 10th	Day	5% 3 7% 17% 27% 41%	526
	11th to 20th	Day	5% 1 4 11% 26% 53%	519
	21st to end	Day	10% 2 7% 17% 28% 36%	583
September	1st to 10th	Day	10% 4 8% 15% 27% 37%	530
	11th to 20th	Day	10% 3 11% 24% 26% 27%	530
	21st to end	Day	10% 3 8% 25% 27% 26%	530
October	1st to 10th	Day	15% 4 17% 31% 25% 7%	530
	11th to 20th	Day	6% 6% 20% 29% 30% 8%	530
	21st to end	Day	7% 5% 21% 37% 23% 6%	583
November	1st to 10th	Day	9% 8% 20% 30% 27% 6%	535
	11th to 20th	Day	11% 7% 23% 36% 19% 5%	540
	21st to end	Day	10% 6% 26% 36% 19% 3	465
December	1st to 10th	Day	7% 11% 39% 28% 11% 5%	330
	11th to 20th	Day	10% 12% 31% 29% 17% 1	330
	21st to end	Day	9% 10% 29% 34% 15% 3	363
January	1st to 10th	Night	11% 8% 29% 38% 14% 1	840
	11th to 20th	Night	11% 8% 28% 38% 14% 1	840
	21st to end	Night	14% 9% 33% 35% 9%	924
February	1st to 10th	Night	14% 7% 28% 35% 15% 1	840
	11th to 20th	Night	11% 6% 31% 38% 12% 1	823
	21st to end	Night	10% 6% 31% 43% 9%	692
March	1st to 10th	Night	5% 6% 33% 41% 14% 1	840
	11th to 20th	Night	9% 6% 26% 41% 17% 1	840
	21st to end	Night	7% 6% 29% 40% 17% 1	924
April	1st to 10th	Night	7% 6% 27% 41% 18% 1	840
	11th to 20th	Night	6% 6% 23% 43% 21% 1	831
	21st to end	Night	5% 4 20% 46% 23% 1	840
May	1st to 10th	Night	6% 4 15% 48% 24% 3	752
	11th to 20th	Night	7% 2 13% 36% 37% 5%	621
	21st to end	Night	8% 2 6% 29% 46% 9%	683
June	1st to 10th	Night	11% 2 7% 29% 44% 7%	630
	11th to 20th	Night	7% 2 5% 21% 46% 20%	630
	21st to end	Night	7% 2 4 15% 50% 22%	630
July	1st to 10th	Night	9% 3 4 12% 47% 26%	615
	11th to 20th	Night	6% 1 2 11% 52% 28%	612
	21st to end	Night	5% 1 3 14% 50% 27%	687
August	1st to 10th	Night	6% 1 3 12% 50% 27%	597
	11th to 20th	Night	4 1 3 11% 49% 32%	661
	21st to end	Night	12% 2 6% 18% 41% 22%	880
September	1st to 10th	Night	9% 2 7% 18% 44% 21%	800
	11th to 20th	Night	11% 3 7% 23% 44% 14%	800
	21st to end	Night	11% 2 7% 23% 43% 15%	800
October	1st to 10th	Night	13% 3 13% 33% 32% 7%	800
	11th to 20th	Night	7% 4 13% 33% 37% 6%	800
	21st to end	Night	10% 3 14% 39% 31% 4	880
November	1st to 10th	Night	9% 4 17% 37% 30% 3	820
	11th to 20th	Night	9% 5% 19% 41% 24% 2	840
	21st to end	Night	10% 4 23% 41% 20% 1	840
December	1st to 10th	Night	7% 4 25% 37% 24% 3	840
	11th to 20th	Night	11% 7% 22% 38% 21% 1	840
	21st to end	Night	11% 5% 25% 37% 21% 1	924

Page generated at 2026-07-28 03:25:26. Version ac07

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