Goochtown
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Goochtown clear sky chart from 2005-11-06 to 2026-02-16.

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% 8% 3 8% 5% 5% 5% 4 6% 7% 36%	130842
	Night	14% 9% 3 8% 5% 4 4 3 5% 7% 39%	130027
Transparency	Day	44% 6% 11% 22% 14% 2	134542
	Night	43% 6% 10% 22% 16% 3	134396
Seeing	Day	18% 11% 24% 23% 16% 8%	16357
	Night	17% 9% 24% 30% 18% 2	26466

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	17% 13% 7% 11% 4 4 4 3 5% 5% 26%	5258
	11th to 20th	Day	13% 12% 5% 15% 4 4 3 2 3 4 36%	5280
	21st to end	Day	20% 10% 5% 7% 6% 4 4 4 4 5% 31%	5780
February	1st to 10th	Day	18% 13% 4 8% 4 3 4 4 5% 6% 33%	2079
	11th to 20th	Day	22% 9% 4 10% 5% 4 3 3 4 6% 30%	1998
	21st to end	Day	19% 11% 4 8% 5% 4 4 3 4 5% 33%	1650
March	1st to 10th	Day	18% 12% 4 7% 4 4 4 3 4 5% 34%	4522
	11th to 20th	Day	13% 7% 2 6% 4 4 4 3 4 7% 44%	4980
	21st to end	Day	13% 8% 2 7% 5% 5% 5% 4 6% 7% 38%	5465
April	1st to 10th	Day	14% 9% 2 7% 5% 4 4 4 6% 7% 39%	2345
	11th to 20th	Day	13% 9% 3 7% 4 4 4 3 5% 7% 41%	2384
	21st to end	Day	15% 8% 3 7% 5% 5% 5% 4 6% 6% 36%	2600
May	1st to 10th	Day	19% 10% 3 8% 5% 5% 5% 4 7% 8% 25%	5862
	11th to 20th	Day	16% 10% 3 9% 6% 5% 5% 4 6% 7% 30%	5861
	21st to end	Day	14% 6% 3 7% 5% 5% 6% 4 8% 8% 34%	6433
June	1st to 10th	Day	10% 6% 2 7% 6% 5% 6% 5% 6% 8% 38%	2600
	11th to 20th	Day	8% 5% 2 7% 5% 5% 5% 4 7% 10% 42%	2600
	21st to end	Day	8% 6% 2 5% 5% 5% 5% 5% 7% 12% 39%	2600
July	1st to 10th	Day	8% 5% 2 7% 5% 5% 5% 5% 7% 9% 41%	5900
	11th to 20th	Day	9% 6% 2 8% 5% 6% 6% 6% 8% 11% 33%	5900
	21st to end	Day	15% 8% 3 9% 6% 5% 6% 5% 7% 9% 28%	6424
August	1st to 10th	Day	8% 5% 2 6% 5% 5% 6% 5% 8% 10% 42%	4234
	11th to 20th	Day	9% 6% 2 6% 5% 6% 6% 5% 8% 11% 35%	4078
	21st to end	Day	5% 4 1 4 3 4 4 4 7% 9% 54%	4312
September	1st to 10th	Day	13% 6% 3 7% 5% 5% 5% 3 5% 7% 40%	2264
	11th to 20th	Day	12% 6% 2 6% 4 4 4 4 6% 8% 45%	2200
	21st to end	Day	16% 5% 2 5% 4 4 3 3 6% 6% 45%	2200
October	1st to 10th	Day	11% 4 2 5% 3 3 3 3 5% 7% 54%	2200
	11th to 20th	Day	13% 6% 2 6% 3 3 3 2 4 6% 52%	2063
	21st to end	Day	19% 7% 2 5% 4 2 3 3 4 6% 44%	2090
November	1st to 10th	Day	11% 6% 2 6% 4 4 4 3 5% 7% 50%	1852
	11th to 20th	Day	16% 8% 2 6% 3 3 3 3 5% 7% 43%	1890
	21st to end	Day	16% 10% 4 7% 4 3 4 4 3 5% 39%	1890
December	1st to 10th	Day	18% 10% 3 7% 5% 4 3 2 4 5% 38%	3020
	11th to 20th	Day	20% 13% 5% 9% 5% 4 4 3 5% 6% 27%	3463
	21st to end	Day	18% 14% 5% 11% 5% 4 5% 4 5% 6% 23%	4565
January	1st to 10th	Night	14% 14% 5% 13% 4 3 3 3 4 6% 30%	7635
	11th to 20th	Night	16% 11% 4 9% 5% 4 4 2 4 5% 36%	7680
	21st to end	Night	18% 10% 4 9% 4 4 3 3 3 5% 37%	8401
February	1st to 10th	Night	19% 10% 4 9% 4 5% 4 4 4 6% 30%	2538
	11th to 20th	Night	22% 11% 4 8% 4 4 3 3 4 5% 33%	2399
	21st to end	Night	21% 12% 3 8% 5% 4 4 3 3 5% 31%	1980
March	1st to 10th	Night	17% 12% 4 8% 5% 4 4 3 4 5% 35%	5329
	11th to 20th	Night	12% 7% 2 5% 4 3 4 3 5% 7% 48%	4980
	21st to end	Night	15% 8% 3 8% 5% 5% 5% 4 5% 6% 35%	5467
April	1st to 10th	Night	13% 8% 2 6% 4 4 5% 5% 5% 6% 42%	2070
	11th to 20th	Night	14% 7% 2 6% 4 4 4 3 5% 6% 44%	1963
	21st to end	Night	16% 7% 3 7% 4 4 4 3 5% 9% 38%	1800
May	1st to 10th	Night	19% 9% 3 8% 6% 5% 5% 4 6% 8% 27%	4033
	11th to 20th	Night	16% 9% 3 9% 6% 5% 5% 5% 5% 7% 29%	4032
	21st to end	Night	12% 7% 3 7% 5% 5% 5% 4 6% 9% 39%	4421
June	1st to 10th	Night	8% 5% 2 7% 5% 4 5% 5% 7% 10% 43%	1800
	11th to 20th	Night	6% 4 2 5% 4 4 6% 4 7% 12% 47%	1800
	21st to end	Night	7% 5% 2 5% 5% 5% 5% 6% 8% 12% 41%	1800
July	1st to 10th	Night	7% 6% 2 6% 5% 4 5% 5% 7% 8% 45%	4058
	11th to 20th	Night	8% 6% 2 6% 4 4 5% 4 8% 12% 40%	4057
	21st to end	Night	11% 8% 3 8% 6% 6% 6% 5% 8% 10% 30%	4427
August	1st to 10th	Night	7% 4 2 7% 4 5% 4 4 6% 9% 47%	2915
	11th to 20th	Night	7% 6% 2 6% 5% 5% 6% 5% 6% 9% 43%	2967
	21st to end	Night	4 3 1 3 2 3 3 4 6% 9% 62%	3586
September	1st to 10th	Night	10% 6% 2 5% 4 3 5% 4 6% 6% 47%	2115
	11th to 20th	Night	10% 6% 3 6% 4 4 4 3 5% 7% 48%	2200
	21st to end	Night	13% 6% 2 5% 3 3 3 3 5% 6% 52%	2200
October	1st to 10th	Night	10% 5% 2 4 3 3 3 3 5% 6% 56%	2200
	11th to 20th	Night	14% 5% 2 6% 4 3 2 3 4 7% 50%	2335
	21st to end	Night	16% 7% 2 6% 3 3 3 3 4 6% 46%	2748
November	1st to 10th	Night	11% 7% 3 5% 4 4 3 3 5% 5% 51%	2666
	11th to 20th	Night	14% 8% 3 6% 3 3 3 2 4 7% 45%	2730
	21st to end	Night	17% 9% 4 6% 3 4 4 3 4 5% 41%	2730
December	1st to 10th	Night	18% 12% 4 9% 4 3 3 2 4 4 36%	4380
	11th to 20th	Night	22% 10% 4 8% 4 3 3 3 4 5% 34%	4952
	21st to end	Night	16% 13% 5% 11% 6% 6% 6% 4 5% 6% 22%	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	59% 5% 9% 19% 8% 1	5259
	11th to 20th	Day	53% 2 5% 21% 16% 2	5280
	21st to end	Day	55% 4 8% 22% 10% 2	5780
February	1st to 10th	Day	53% 5% 8% 19% 13% 2	2079
	11th to 20th	Day	56% 4 7% 20% 11% 2	2008
	21st to end	Day	53% 4 9% 17% 14% 4	1650
March	1st to 10th	Day	52% 4 5% 15% 18% 6%	4522
	11th to 20th	Day	39% 4 9% 24% 21% 3	4980
	21st to end	Day	44% 6% 10% 28% 12% 1	5465
April	1st to 10th	Day	42% 6% 10% 24% 15% 3	2345
	11th to 20th	Day	44% 4 9% 22% 18% 3	2384
	21st to end	Day	45% 7% 10% 25% 11% 2	2600
May	1st to 10th	Day	53% 8% 12% 18% 9%	5897
	11th to 20th	Day	52% 7% 12% 19% 9%	5865
	21st to end	Day	43% 9% 14% 18% 14% 2	6447
June	1st to 10th	Day	40% 9% 11% 23% 16% 2	2600
	11th to 20th	Day	35% 9% 14% 22% 17% 2	2600
	21st to end	Day	36% 9% 15% 20% 18% 3	2600
July	1st to 10th	Day	37% 9% 17% 22% 15% 1	5835
	11th to 20th	Day	40% 12% 17% 24% 6% 1	5831
	21st to end	Day	50% 9% 13% 20% 7% 1	6240
August	1st to 10th	Day	33% 10% 16% 29% 11%	4221
	11th to 20th	Day	36% 10% 14% 26% 13% 1	4117
	21st to end	Day	25% 8% 12% 39% 15% 2	4311
September	1st to 10th	Day	41% 8% 12% 18% 17% 4	2264
	11th to 20th	Day	35% 7% 11% 23% 22% 2	2200
	21st to end	Day	38% 5% 10% 24% 20% 3	2200
October	1st to 10th	Day	21% 5% 7% 23% 41% 3	3590
	11th to 20th	Day	24% 3 9% 27% 31% 6%	3342
	21st to end	Day	31% 3 8% 28% 20% 10%	3353
November	1st to 10th	Day	35% 4 8% 24% 24% 4	1852
	11th to 20th	Day	40% 4 7% 26% 19% 5%	1890
	21st to end	Day	47% 4 8% 22% 16% 3	1890
December	1st to 10th	Day	49% 4 6% 21% 19% 1	3020
	11th to 20th	Day	58% 4 8% 17% 11% 2	3460
	21st to end	Day	60% 5% 11% 17% 5% 1	4565
January	1st to 10th	Night	55% 5% 11% 21% 7% 1	7636
	11th to 20th	Night	51% 4 5% 18% 17% 4	7680
	21st to end	Night	52% 3 7% 19% 15% 3	8401
February	1st to 10th	Night	55% 5% 10% 18% 12% 1	2538
	11th to 20th	Night	55% 4 7% 19% 13% 3	2400
	21st to end	Night	56% 5% 8% 15% 13% 4	1980
March	1st to 10th	Night	52% 4 6% 20% 13% 5%	5329
	11th to 20th	Night	35% 4 8% 27% 19% 5%	4980
	21st to end	Night	48% 6% 9% 23% 13% 1	5467
April	1st to 10th	Night	40% 7% 10% 22% 18% 3	2070
	11th to 20th	Night	41% 5% 9% 20% 20% 5%	1963
	21st to end	Night	44% 6% 11% 25% 13% 2	1800
May	1st to 10th	Night	53% 8% 11% 19% 8% 1	4060
	11th to 20th	Night	52% 8% 10% 20% 9%	4033
	21st to end	Night	41% 9% 13% 22% 14% 1	4429
June	1st to 10th	Night	33% 8% 15% 26% 14% 3	1800
	11th to 20th	Night	29% 9% 17% 23% 20% 2	1800
	21st to end	Night	33% 10% 15% 21% 17% 4	1800
July	1st to 10th	Night	34% 9% 13% 25% 16% 1	4015
	11th to 20th	Night	33% 12% 20% 24% 9% 2	4006
	21st to end	Night	45% 11% 15% 20% 8%	4297
August	1st to 10th	Night	31% 9% 13% 28% 17% 1	2904
	11th to 20th	Night	34% 10% 14% 28% 13% 1	2994
	21st to end	Night	19% 7% 13% 37% 21% 3	3586
September	1st to 10th	Night	33% 9% 14% 20% 18% 6%	2115
	11th to 20th	Night	34% 7% 10% 25% 21% 2	2200
	21st to end	Night	34% 5% 9% 22% 26% 4	2200
October	1st to 10th	Night	24% 5% 8% 21% 37% 5%	3590
	11th to 20th	Night	24% 4 7% 24% 33% 9%	3795
	21st to end	Night	28% 3 9% 22% 29% 9%	4435
November	1st to 10th	Night	36% 4 7% 24% 24% 5%	2666
	11th to 20th	Night	40% 4 7% 20% 23% 6%	2730
	21st to end	Night	46% 3 7% 24% 17% 3	2730
December	1st to 10th	Night	53% 4 7% 19% 16% 1	4380
	11th to 20th	Night	53% 4 8% 20% 13% 1	4954
	21st to end	Night	61% 6% 10% 15% 7%	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	25% 17% 37% 15% 5% 1	330
	11th to 20th	Day	26% 28% 32% 12% 2	330
	21st to end	Day	25% 24% 37% 12% 2	363
February	1st to 10th	Day	24% 19% 41% 13% 3	330
	11th to 20th	Day	38% 21% 30% 8% 2 1	315
	21st to end	Day	35% 20% 33% 11% 1	249
March	1st to 10th	Day	30% 19% 32% 13% 5%	316
	11th to 20th	Day	23% 22% 31% 19% 4 1	500
	21st to end	Day	27% 16% 34% 18% 5%	550
April	1st to 10th	Day	22% 20% 26% 22% 10% 1	500
	11th to 20th	Day	19% 18% 29% 20% 11% 3	492
	21st to end	Day	19% 15% 31% 22% 11% 3	500
May	1st to 10th	Day	22% 13% 30% 21% 10% 3	503
	11th to 20th	Day	17% 11% 28% 24% 14% 6%	527
	21st to end	Day	14% 10% 19% 28% 18% 11%	573
June	1st to 10th	Day	12% 5% 20% 29% 22% 11%	530
	11th to 20th	Day	9% 4 19% 28% 28% 12%	530
	21st to end	Day	9% 4 22% 27% 23% 15%	530
July	1st to 10th	Day	11% 2 13% 26% 25% 23%	525
	11th to 20th	Day	10% 3 14% 29% 27% 17%	524
	21st to end	Day	14% 5% 12% 27% 27% 17%	576
August	1st to 10th	Day	13% 4 13% 27% 26% 18%	526
	11th to 20th	Day	12% 3 15% 31% 26% 13%	519
	21st to end	Day	9% 3 10% 24% 34% 20%	583
September	1st to 10th	Day	12% 3 12% 24% 31% 18%	530
	11th to 20th	Day	13% 3 11% 25% 32% 16%	530
	21st to end	Day	18% 5% 15% 30% 23% 8%	530
October	1st to 10th	Day	13% 4 17% 31% 26% 8%	530
	11th to 20th	Day	13% 10% 26% 30% 14% 7%	530
	21st to end	Day	22% 12% 27% 26% 11% 1	473
November	1st to 10th	Day	17% 11% 35% 25% 10% 2	330
	11th to 20th	Day	19% 16% 38% 20% 6%	330
	21st to end	Day	24% 15% 33% 19% 7% 1	330
December	1st to 10th	Day	26% 19% 32% 17% 4 1	330
	11th to 20th	Day	23% 19% 32% 20% 6%	330
	21st to end	Day	30% 17% 34% 14% 5%	363
January	1st to 10th	Night	23% 16% 33% 23% 5%	840
	11th to 20th	Night	28% 18% 31% 20% 4	840
	21st to end	Night	21% 15% 40% 23% 2	924
February	1st to 10th	Night	24% 13% 35% 25% 3	840
	11th to 20th	Night	29% 15% 36% 18% 2	804
	21st to end	Night	28% 14% 38% 18% 1	660
March	1st to 10th	Night	22% 14% 34% 26% 4	800
	11th to 20th	Night	22% 14% 35% 23% 6% 1	800
	21st to end	Night	20% 14% 31% 29% 7%	880
April	1st to 10th	Night	18% 11% 33% 29% 9% 1	670
	11th to 20th	Night	18% 11% 31% 27% 12% 1	593
	21st to end	Night	18% 7% 34% 31% 10% 1	600
May	1st to 10th	Night	17% 8% 27% 31% 14% 2	600
	11th to 20th	Night	15% 6% 21% 35% 20% 3	591
	21st to end	Night	8% 4 18% 37% 29% 5%	650
June	1st to 10th	Night	9% 3 13% 45% 26% 4	600
	11th to 20th	Night	7% 2 15% 38% 34% 5%	600
	21st to end	Night	8% 2 13% 41% 31% 4	600
July	1st to 10th	Night	10% 1 11% 31% 38% 8%	585
	11th to 20th	Night	7% 2 8% 31% 45% 7%	582
	21st to end	Night	10% 2 9% 33% 40% 7%	657
August	1st to 10th	Night	9% 2 8% 30% 44% 6%	597
	11th to 20th	Night	8% 2 11% 37% 37% 6%	594
	21st to end	Night	7% 1 7% 34% 41% 10%	660
September	1st to 10th	Night	11% 2 10% 33% 37% 5%	715
	11th to 20th	Night	11% 3 12% 30% 38% 6%	800
	21st to end	Night	15% 4 17% 31% 29% 4	800
October	1st to 10th	Night	12% 5% 16% 30% 33% 5%	800
	11th to 20th	Night	17% 6% 22% 34% 19% 2	800
	21st to end	Night	19% 9% 29% 28% 14% 2	880
November	1st to 10th	Night	15% 7% 24% 37% 15% 2	820
	11th to 20th	Night	18% 11% 32% 31% 8% 1	840
	21st to end	Night	23% 11% 25% 31% 9% 1	840
December	1st to 10th	Night	27% 12% 28% 28% 6%	840
	11th to 20th	Night	24% 11% 32% 27% 6% 1	840
	21st to end	Night	27% 15% 27% 28% 3	924

Page generated at 2026-02-13 01:42:16. Version ac07

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