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 2024-11-30.

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 7% 5% 4 5% 4 6% 7% 37%	101206
	Night	14% 9% 3 7% 5% 4 4 4 5% 7% 40%	98363
Transparency	Day	43% 6% 11% 23% 15% 2	104950
	Night	42% 6% 10% 22% 17% 3	102757
Seeing	Day	18% 11% 24% 23% 16% 8%	14800
	Night	18% 8% 24% 29% 18% 3	24851

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	15% 15% 7% 8% 5% 4 5% 4 6% 7% 25%	2836
	11th to 20th	Day	17% 15% 5% 16% 5% 5% 3 2 3 4 25%	2840
	21st to end	Day	24% 14% 6% 7% 4 4 3 3 4 5% 27%	3124
February	1st to 10th	Day	18% 13% 4 8% 4 3 4 4 5% 6% 32%	1881
	11th to 20th	Day	21% 9% 4 9% 4 4 3 3 4 6% 31%	1848
	21st to end	Day	20% 11% 4 8% 5% 4 4 3 4 5% 31%	1570
March	1st to 10th	Day	23% 13% 3 7% 4 4 4 3 4 5% 30%	3148
	11th to 20th	Day	15% 6% 2 6% 4 3 4 3 4 7% 46%	3480
	21st to end	Day	14% 9% 2 7% 5% 4 5% 3 5% 7% 38%	3815
April	1st to 10th	Day	13% 9% 2 7% 4 4 4 4 6% 7% 40%	2228
	11th to 20th	Day	14% 9% 3 7% 4 3 4 3 5% 6% 41%	2263
	21st to end	Day	15% 7% 3 7% 5% 5% 5% 4 6% 6% 37%	2470
May	1st to 10th	Day	19% 10% 3 7% 5% 4 5% 4 6% 7% 30%	4082
	11th to 20th	Day	17% 10% 3 7% 5% 5% 4 3 5% 6% 35%	4081
	21st to end	Day	12% 6% 3 7% 5% 5% 6% 4 7% 8% 38%	4476
June	1st to 10th	Day	10% 6% 2 7% 7% 5% 6% 5% 6% 8% 38%	2470
	11th to 20th	Day	7% 5% 2 7% 5% 5% 5% 4 7% 10% 43%	2470
	21st to end	Day	8% 6% 2 5% 6% 5% 5% 5% 7% 11% 39%	2470
July	1st to 10th	Day	9% 5% 3 7% 5% 6% 6% 5% 8% 10% 37%	4120
	11th to 20th	Day	8% 5% 2 7% 5% 5% 6% 4 7% 10% 41%	4120
	21st to end	Day	19% 10% 4 10% 6% 5% 5% 5% 6% 7% 23%	4466
August	1st to 10th	Day	7% 5% 2 6% 5% 5% 6% 5% 8% 10% 42%	4104
	11th to 20th	Day	9% 6% 2 6% 5% 5% 6% 5% 8% 11% 36%	3951
	21st to end	Day	5% 4 1 4 3 4 4 4 7% 9% 53%	4180
September	1st to 10th	Day	13% 6% 3 7% 5% 5% 5% 3 5% 7% 40%	2151
	11th to 20th	Day	13% 6% 2 6% 4 4 4 4 6% 8% 44%	2090
	21st to end	Day	16% 5% 2 5% 4 4 3 3 6% 6% 45%	2090
October	1st to 10th	Day	11% 4 2 5% 3 3 3 3 6% 7% 53%	2090
	11th to 20th	Day	13% 6% 2 6% 4 3 3 3 4 6% 51%	1960
	21st to end	Day	19% 7% 2 5% 4 2 3 3 4 6% 45%	1986
November	1st to 10th	Day	12% 6% 2 6% 3 4 3 2 4 7% 51%	1762
	11th to 20th	Day	16% 8% 2 5% 3 3 3 3 5% 7% 43%	1800
	21st to end	Day	16% 10% 3 7% 3 4 4 4 3 6% 40%	1797
December	1st to 10th	Day	22% 12% 3 7% 5% 5% 3 3 4 5% 31%	1710
	11th to 20th	Day	16% 12% 3 8% 5% 5% 4 4 5% 6% 32%	2153
	21st to end	Day	18% 15% 5% 9% 5% 4 5% 4 5% 7% 24%	3124
January	1st to 10th	Night	16% 16% 6% 9% 5% 4 4 3 4 6% 27%	4109
	11th to 20th	Night	19% 14% 4 9% 7% 4 3 2 3 4 30%	4120
	21st to end	Night	22% 13% 5% 8% 4 3 3 3 4 5% 30%	4532
February	1st to 10th	Night	19% 10% 4 9% 5% 4 4 4 4 6% 30%	2297
	11th to 20th	Night	21% 11% 4 8% 4 4 3 3 4 5% 34%	2218
	21st to end	Night	23% 12% 3 8% 5% 4 4 3 4 5% 29%	1884
March	1st to 10th	Night	19% 13% 3 7% 5% 5% 4 3 5% 5% 31%	3703
	11th to 20th	Night	12% 8% 2 5% 4 3 4 3 5% 6% 49%	3480
	21st to end	Night	14% 8% 3 7% 5% 5% 5% 4 5% 6% 39%	3817
April	1st to 10th	Night	12% 8% 2 6% 4 4 5% 5% 5% 6% 44%	1967
	11th to 20th	Night	14% 8% 2 6% 4 4 4 3 5% 6% 43%	1864
	21st to end	Night	16% 7% 3 7% 5% 4 4 3 5% 8% 39%	1710
May	1st to 10th	Night	19% 8% 3 8% 6% 5% 5% 4 5% 6% 31%	2813
	11th to 20th	Night	17% 8% 3 6% 4 5% 4 4 5% 7% 37%	2812
	21st to end	Night	7% 5% 2 7% 5% 5% 5% 4 6% 9% 44%	3079
June	1st to 10th	Night	8% 5% 2 7% 5% 4 5% 5% 7% 10% 43%	1710
	11th to 20th	Night	5% 4 2 5% 4 4 5% 4 7% 12% 48%	1710
	21st to end	Night	7% 6% 2 5% 4 5% 5% 6% 8% 12% 41%	1710
July	1st to 10th	Night	7% 6% 2 6% 5% 4 5% 5% 8% 9% 42%	2840
	11th to 20th	Night	7% 6% 2 5% 3 4 4 4 7% 10% 49%	2840
	21st to end	Night	14% 9% 3 9% 6% 6% 5% 5% 8% 8% 26%	3087
August	1st to 10th	Night	7% 4 2 7% 4 5% 4 4 6% 9% 48%	2825
	11th to 20th	Night	7% 6% 2 6% 5% 5% 6% 5% 6% 9% 43%	2874
	21st to end	Night	4 3 1 3 3 3 3 4 6% 9% 62%	3476
September	1st to 10th	Night	11% 6% 2 5% 4 3 5% 4 6% 6% 48%	2009
	11th to 20th	Night	10% 6% 3 6% 4 4 4 3 5% 8% 47%	2090
	21st to end	Night	12% 6% 2 5% 3 3 3 3 4 6% 52%	2090
October	1st to 10th	Night	10% 5% 2 4 3 3 3 3 5% 7% 56%	2090
	11th to 20th	Night	14% 5% 2 6% 4 3 2 3 4 7% 48%	2218
	21st to end	Night	15% 7% 2 6% 3 3 3 3 5% 6% 47%	2610
November	1st to 10th	Night	11% 7% 3 5% 4 4 3 3 4 5% 51%	2536
	11th to 20th	Night	15% 8% 3 6% 3 3 4 2 5% 7% 45%	2600
	21st to end	Night	17% 9% 4 6% 3 4 3 3 4 5% 41%	2599
December	1st to 10th	Night	21% 12% 4 8% 4 3 4 3 5% 5% 31%	2470
	11th to 20th	Night	18% 10% 4 9% 5% 3 4 3 4 5% 35%	3042
	21st to end	Night	16% 14% 4 10% 7% 6% 6% 4 5% 6% 21%	4532

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	57% 5% 9% 18% 9% 1	2837
	11th to 20th	Day	65% 2 7% 18% 8%	2840
	21st to end	Day	61% 4 7% 21% 7% 1	3124
February	1st to 10th	Day	54% 5% 7% 19% 14% 2	1881
	11th to 20th	Day	55% 5% 7% 21% 11% 2	1858
	21st to end	Day	55% 4 9% 15% 12% 5%	1570
March	1st to 10th	Day	56% 4 6% 17% 12% 4	3148
	11th to 20th	Day	39% 5% 11% 26% 18% 2	3480
	21st to end	Day	44% 6% 11% 27% 11% 1	3815
April	1st to 10th	Day	42% 6% 10% 24% 15% 3	2228
	11th to 20th	Day	44% 4 8% 22% 19% 3	2263
	21st to end	Day	44% 7% 10% 26% 11% 2	2470
May	1st to 10th	Day	52% 7% 11% 22% 9% 1	4120
	11th to 20th	Day	49% 7% 9% 22% 12%	4085
	21st to end	Day	40% 9% 13% 20% 17% 2	4489
June	1st to 10th	Day	40% 9% 11% 23% 15% 2	2470
	11th to 20th	Day	34% 9% 14% 23% 17% 2	2470
	21st to end	Day	37% 9% 14% 19% 18% 3	2470
July	1st to 10th	Day	39% 9% 19% 20% 12% 1	4055
	11th to 20th	Day	36% 8% 15% 30% 9% 2	4051
	21st to end	Day	59% 8% 11% 14% 8% 1	4324
August	1st to 10th	Day	32% 10% 16% 30% 12%	4091
	11th to 20th	Day	36% 10% 14% 25% 13% 1	3990
	21st to end	Day	25% 8% 12% 39% 14% 2	4179
September	1st to 10th	Day	42% 7% 11% 18% 17% 4	2151
	11th to 20th	Day	37% 7% 11% 22% 21% 3	2090
	21st to end	Day	38% 5% 10% 25% 20% 3	2090
October	1st to 10th	Day	21% 5% 7% 23% 41% 3	3480
	11th to 20th	Day	25% 3 9% 27% 31% 6%	3239
	21st to end	Day	30% 3 8% 28% 20% 10%	3249
November	1st to 10th	Day	35% 4 8% 24% 24% 5%	1762
	11th to 20th	Day	40% 4 7% 25% 19% 5%	1800
	21st to end	Day	46% 4 8% 22% 17% 3	1797
December	1st to 10th	Day	56% 4 8% 20% 10% 1	1710
	11th to 20th	Day	51% 5% 10% 19% 13% 2	2150
	21st to end	Day	58% 5% 11% 19% 6% 1	3124
January	1st to 10th	Night	58% 5% 9% 16% 10% 2	4109
	11th to 20th	Night	59% 3 6% 15% 13% 3	4120
	21st to end	Night	57% 4 8% 19% 11% 1	4532
February	1st to 10th	Night	55% 4 10% 18% 12% 1	2297
	11th to 20th	Night	54% 4 7% 19% 14% 3	2219
	21st to end	Night	58% 5% 8% 14% 12% 4	1884
March	1st to 10th	Night	55% 5% 7% 18% 13% 2	3703
	11th to 20th	Night	36% 5% 8% 31% 13% 7%	3480
	21st to end	Night	45% 6% 10% 22% 15% 1	3817
April	1st to 10th	Night	38% 7% 11% 22% 18% 4	1967
	11th to 20th	Night	41% 5% 8% 19% 21% 6%	1864
	21st to end	Night	44% 6% 10% 26% 13% 2	1710
May	1st to 10th	Night	51% 8% 10% 21% 7% 2	2840
	11th to 20th	Night	45% 9% 11% 23% 12% 1	2813
	21st to end	Night	34% 9% 12% 24% 18% 2	3087
June	1st to 10th	Night	33% 8% 15% 26% 14% 4	1710
	11th to 20th	Night	27% 9% 18% 23% 20% 2	1710
	21st to end	Night	33% 10% 16% 20% 16% 5%	1710
July	1st to 10th	Night	34% 10% 15% 28% 12% 2	2795
	11th to 20th	Night	29% 8% 17% 31% 12% 3	2786
	21st to end	Night	51% 10% 13% 17% 9% 1	2988
August	1st to 10th	Night	31% 9% 13% 29% 17% 1	2814
	11th to 20th	Night	34% 10% 13% 28% 13% 1	2901
	21st to end	Night	19% 7% 13% 37% 21% 4	3476
September	1st to 10th	Night	33% 9% 14% 20% 18% 6%	2009
	11th to 20th	Night	35% 7% 10% 24% 21% 3	2090
	21st to end	Night	34% 4 9% 23% 26% 4	2090
October	1st to 10th	Night	24% 5% 8% 21% 38% 5%	3480
	11th to 20th	Night	24% 3 7% 24% 32% 9%	3678
	21st to end	Night	27% 3 9% 23% 29% 9%	4297
November	1st to 10th	Night	36% 4 7% 24% 24% 5%	2536
	11th to 20th	Night	40% 4 7% 19% 24% 6%	2600
	21st to end	Night	46% 3 7% 24% 18% 3	2599
December	1st to 10th	Night	56% 5% 8% 19% 10% 2	2470
	11th to 20th	Night	52% 4 7% 20% 14% 2	3044
	21st to end	Night	60% 6% 10% 15% 8%	4532

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	24% 18% 37% 15% 5% 1	270
	11th to 20th	Day	30% 24% 31% 12% 2	270
	21st to end	Day	27% 23% 36% 12% 2	297
February	1st to 10th	Day	25% 19% 39% 13% 4	270
	11th to 20th	Day	39% 22% 29% 8% 2 1	270
	21st to end	Day	38% 20% 32% 10% 1	225
March	1st to 10th	Day	32% 18% 33% 13% 4	285
	11th to 20th	Day	24% 22% 30% 18% 4 1	460
	21st to end	Day	28% 15% 33% 18% 6%	506
April	1st to 10th	Day	22% 20% 25% 23% 10% 1	460
	11th to 20th	Day	20% 17% 28% 20% 11% 3	452
	21st to end	Day	18% 16% 32% 21% 11% 3	460
May	1st to 10th	Day	21% 13% 30% 21% 11% 3	463
	11th to 20th	Day	17% 10% 27% 25% 14% 7%	487
	21st to end	Day	13% 9% 17% 29% 20% 12%	529
June	1st to 10th	Day	13% 6% 19% 28% 23% 11%	490
	11th to 20th	Day	8% 4 19% 29% 29% 11%	490
	21st to end	Day	10% 4 23% 29% 21% 13%	490
July	1st to 10th	Day	11% 2 13% 27% 24% 23%	485
	11th to 20th	Day	10% 3 15% 27% 27% 17%	484
	21st to end	Day	15% 5% 13% 28% 25% 15%	532
August	1st to 10th	Day	12% 3 14% 27% 26% 17%	486
	11th to 20th	Day	12% 3 16% 33% 25% 12%	479
	21st to end	Day	9% 3 9% 24% 33% 21%	539
September	1st to 10th	Day	13% 3 12% 25% 30% 18%	490
	11th to 20th	Day	14% 3 12% 25% 31% 14%	490
	21st to end	Day	18% 6% 16% 28% 23% 9%	490
October	1st to 10th	Day	13% 5% 18% 32% 25% 7%	490
	11th to 20th	Day	13% 11% 27% 28% 13% 7%	490
	21st to end	Day	23% 10% 28% 27% 11% 2	435
November	1st to 10th	Day	17% 10% 34% 25% 11% 2	300
	11th to 20th	Day	20% 15% 38% 20% 6%	300
	21st to end	Day	24% 15% 33% 19% 8% 1	299
December	1st to 10th	Day	28% 20% 29% 17% 5% 1	270
	11th to 20th	Day	23% 19% 30% 20% 7%	270
	21st to end	Day	31% 18% 35% 11% 5%	297
January	1st to 10th	Night	24% 16% 32% 22% 5%	760
	11th to 20th	Night	29% 18% 29% 21% 4	760
	21st to end	Night	21% 15% 39% 23% 2	836
February	1st to 10th	Night	25% 14% 35% 24% 3	760
	11th to 20th	Night	28% 15% 36% 19% 2	743
	21st to end	Night	30% 14% 37% 17% 1	628
March	1st to 10th	Night	23% 14% 34% 25% 5%	760
	11th to 20th	Night	22% 14% 35% 22% 6% 1	760
	21st to end	Night	20% 13% 30% 29% 7%	836
April	1st to 10th	Night	17% 11% 34% 30% 9% 1	637
	11th to 20th	Night	19% 11% 31% 27% 12% 1	563
	21st to end	Night	18% 6% 34% 29% 11% 1	570
May	1st to 10th	Night	17% 8% 27% 30% 15% 2	570
	11th to 20th	Night	15% 5% 21% 35% 21% 3	561
	21st to end	Night	6% 3 18% 37% 30% 6%	617
June	1st to 10th	Night	10% 3 13% 44% 26% 4	570
	11th to 20th	Night	7% 1 15% 38% 34% 5%	570
	21st to end	Night	9% 2 14% 42% 30% 4	570
July	1st to 10th	Night	11% 1 11% 31% 38% 8%	555
	11th to 20th	Night	7% 2 8% 32% 44% 7%	552
	21st to end	Night	11% 2 9% 33% 39% 6%	624
August	1st to 10th	Night	9% 2 9% 30% 44% 6%	567
	11th to 20th	Night	8% 2 11% 37% 36% 6%	564
	21st to end	Night	7% 1 7% 33% 42% 10%	627
September	1st to 10th	Night	12% 2 10% 33% 38% 5%	679
	11th to 20th	Night	12% 3 13% 30% 37% 6%	760
	21st to end	Night	15% 4 17% 31% 30% 4	760
October	1st to 10th	Night	12% 5% 16% 30% 32% 5%	760
	11th to 20th	Night	17% 6% 22% 33% 19% 2	760
	21st to end	Night	17% 9% 29% 29% 14% 2	836
November	1st to 10th	Night	15% 7% 24% 36% 16% 2	780
	11th to 20th	Night	18% 10% 32% 31% 8% 1	800
	21st to end	Night	22% 11% 25% 32% 9% 1	800
December	1st to 10th	Night	28% 12% 28% 27% 6%	760
	11th to 20th	Night	24% 11% 32% 27% 6% 1	760
	21st to end	Night	27% 15% 27% 28% 3	836

Page generated at 2024-11-27 17:30:55. Version ac07

Copyright © 2024 Attilla Danko.