Goheenville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Goheenville clear sky chart from 2005-11-06 to 2024-11-05.

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% 11% 4 8% 5% 4 4 4 5% 7% 31%	101216
	Night	19% 11% 4 8% 5% 4 4 3 5% 6% 32%	97755
Transparency	Day	52% 6% 11% 20% 10% 1	104859
	Night	52% 6% 10% 20% 11% 1	102251
Seeing	Day	24% 15% 27% 20% 10% 4	14700
	Night	23% 13% 27% 26% 11% 1	24266

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	19% 22% 11% 13% 4 3 3 2 2 4 17%	2686
	11th to 20th	Day	13% 21% 9% 19% 9% 3 3 2 3 3 16%	2840
	21st to end	Day	27% 19% 8% 14% 6% 4 3 2 2 3 11%	3124
February	1st to 10th	Day	20% 19% 6% 11% 8% 4 4 3 3 4 20%	1710
	11th to 20th	Day	18% 15% 6% 13% 6% 6% 3 3 4 6% 21%	1663
	21st to end	Day	21% 16% 4 11% 5% 4 3 3 4 6% 23%	1553
March	1st to 10th	Day	21% 12% 5% 8% 4 3 3 3 4 6% 30%	3435
	11th to 20th	Day	14% 15% 6% 9% 5% 4 4 3 3 6% 31%	3480
	21st to end	Day	19% 10% 3 8% 5% 4 4 3 5% 6% 32%	3815
April	1st to 10th	Day	17% 15% 3 7% 4 5% 4 4 6% 6% 29%	2225
	11th to 20th	Day	18% 12% 2 8% 5% 5% 4 3 5% 6% 33%	2254
	21st to end	Day	23% 10% 3 7% 4 4 3 3 5% 6% 33%	2464
May	1st to 10th	Day	26% 8% 3 7% 4 5% 4 4 5% 7% 28%	4082
	11th to 20th	Day	22% 8% 3 8% 5% 5% 5% 4 5% 7% 29%	4139
	21st to end	Day	14% 6% 2 6% 4 4 5% 4 6% 9% 39%	4823
June	1st to 10th	Day	16% 8% 2 6% 5% 5% 5% 4 7% 8% 33%	2660
	11th to 20th	Day	16% 7% 3 7% 4 4 5% 4 7% 9% 34%	2660
	21st to end	Day	16% 6% 2 6% 5% 4 5% 4 6% 10% 36%	2660
July	1st to 10th	Day	12% 6% 2 6% 5% 5% 6% 5% 5% 9% 38%	4440
	11th to 20th	Day	12% 6% 2 5% 5% 4 5% 4 6% 10% 39%	4164
	21st to end	Day	12% 7% 2 7% 6% 5% 5% 5% 6% 8% 37%	4466
August	1st to 10th	Day	18% 8% 3 8% 5% 5% 6% 5% 6% 7% 28%	4104
	11th to 20th	Day	14% 6% 3 7% 5% 5% 5% 5% 6% 8% 35%	4044
	21st to end	Day	11% 5% 2 6% 5% 5% 5% 5% 7% 10% 39%	4262
September	1st to 10th	Day	18% 6% 2 5% 4 3 4 3 4 7% 43%	2280
	11th to 20th	Day	13% 6% 2 5% 4 4 5% 4 6% 8% 43%	2152
	21st to end	Day	22% 8% 3 6% 4 3 4 4 5% 7% 34%	2057
October	1st to 10th	Day	19% 7% 2 7% 4 4 3 3 6% 7% 38%	1900
	11th to 20th	Day	22% 9% 3 6% 4 4 5% 3 5% 5% 34%	1900
	21st to end	Day	24% 11% 3 7% 4 3 4 3 4 7% 30%	2090
November	1st to 10th	Day	12% 9% 3 7% 4 5% 4 4 5% 7% 41%	1842
	11th to 20th	Day	18% 15% 4 7% 4 3 4 3 5% 6% 30%	1520
	21st to end	Day	20% 17% 6% 7% 5% 4 4 3 5% 5% 23%	1520
December	1st to 10th	Day	22% 22% 8% 11% 5% 5% 3 2 4 3 17%	1520
	11th to 20th	Day	20% 19% 8% 11% 5% 3 4 2 3 5% 20%	1910
	21st to end	Day	27% 24% 6% 10% 4 3 3 3 2 3 14%	2772
January	1st to 10th	Night	17% 22% 9% 12% 5% 4 3 2 4 5% 17%	4255
	11th to 20th	Night	17% 19% 8% 15% 5% 6% 5% 3 3 4 14%	4120
	21st to end	Night	30% 16% 8% 12% 5% 3 3 2 3 3 16%	4532
February	1st to 10th	Night	20% 14% 5% 12% 7% 5% 4 3 3 3 23%	2470
	11th to 20th	Night	19% 14% 5% 12% 5% 5% 5% 3 4 5% 23%	2403
	21st to end	Night	21% 13% 4 10% 7% 4 4 4 4 5% 25%	1898
March	1st to 10th	Night	24% 12% 3 6% 4 3 4 3 4 5% 32%	3418
	11th to 20th	Night	19% 14% 6% 6% 4 3 3 3 4 5% 32%	3480
	21st to end	Night	17% 11% 3 6% 4 4 3 3 4 5% 40%	3817
April	1st to 10th	Night	19% 13% 4 7% 5% 4 4 2 4 5% 32%	1953
	11th to 20th	Night	18% 9% 2 7% 4 3 4 3 5% 6% 38%	1875
	21st to end	Night	16% 9% 3 7% 5% 5% 4 3 5% 8% 36%	1731
May	1st to 10th	Night	29% 8% 3 6% 5% 3 4 4 5% 6% 29%	2813
	11th to 20th	Night	20% 10% 3 7% 4 4 4 3 5% 7% 34%	2749
	21st to end	Night	14% 6% 2 7% 4 4 4 3 6% 10% 40%	2732
June	1st to 10th	Night	12% 6% 2 6% 4 5% 4 4 5% 8% 44%	1520
	11th to 20th	Night	12% 6% 2 6% 4 5% 4 3 7% 10% 41%	1520
	21st to end	Night	13% 5% 2 6% 5% 4 6% 4 6% 9% 40%	1520
July	1st to 10th	Night	14% 8% 3 7% 5% 4 4 3 5% 7% 40%	2520
	11th to 20th	Night	12% 5% 2 6% 5% 4 5% 4 7% 8% 42%	2792
	21st to end	Night	13% 7% 2 8% 5% 4 5% 4 5% 7% 40%	3087
August	1st to 10th	Night	16% 8% 3 8% 4 4 4 4 5% 7% 36%	2825
	11th to 20th	Night	17% 6% 2 6% 4 4 4 3 5% 8% 41%	2785
	21st to end	Night	9% 5% 2 6% 4 5% 5% 4 7% 9% 45%	3348
September	1st to 10th	Night	14% 6% 2 5% 3 4 4 3 5% 6% 49%	1900
	11th to 20th	Night	11% 4 2 6% 3 3 3 3 6% 7% 51%	2023
	21st to end	Night	20% 7% 3 6% 5% 4 3 3 5% 8% 38%	2123
October	1st to 10th	Night	17% 6% 2 5% 4 4 4 4 5% 6% 43%	2280
	11th to 20th	Night	20% 7% 2 6% 4 4 4 3 4 6% 39%	2280
	21st to end	Night	25% 10% 2 5% 4 3 4 3 4 6% 33%	2508
November	1st to 10th	Night	15% 9% 2 6% 4 4 4 3 5% 6% 42%	2329
	11th to 20th	Night	19% 13% 4 7% 4 4 4 4 5% 6% 29%	2660
	21st to end	Night	20% 14% 4 7% 4 4 4 4 5% 6% 28%	2660
December	1st to 10th	Night	22% 17% 8% 9% 5% 4 4 3 4 5% 17%	2660
	11th to 20th	Night	20% 17% 7% 11% 6% 3 3 2 4 4 22%	3285
	21st to end	Night	25% 21% 6% 9% 5% 4 4 3 4 5% 14%	4884

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	74% 3 7% 10% 5%	2687
	11th to 20th	Day	75% 4 7% 11% 3 1	2840
	21st to end	Day	80% 4 7% 7% 2	3124
February	1st to 10th	Day	70% 3 8% 12% 6%	1710
	11th to 20th	Day	67% 4 9% 14% 6%	1672
	21st to end	Day	64% 4 9% 15% 7% 1	1553
March	1st to 10th	Day	55% 5% 10% 24% 6%	3435
	11th to 20th	Day	55% 5% 14% 18% 6% 1	3480
	21st to end	Day	52% 5% 10% 20% 12% 1	3815
April	1st to 10th	Day	54% 6% 10% 17% 11% 2	2225
	11th to 20th	Day	52% 5% 10% 17% 14% 2	2254
	21st to end	Day	52% 4 10% 20% 11% 2	2464
May	1st to 10th	Day	55% 7% 8% 20% 8% 1	4120
	11th to 20th	Day	53% 8% 11% 19% 8% 1	4143
	21st to end	Day	39% 9% 14% 23% 12% 3	4837
June	1st to 10th	Day	47% 8% 11% 22% 10% 1	2660
	11th to 20th	Day	45% 9% 12% 21% 12% 1	2660
	21st to end	Day	42% 9% 11% 26% 11% 1	2660
July	1st to 10th	Day	42% 8% 10% 23% 14% 2	4370
	11th to 20th	Day	40% 6% 12% 27% 14%	4093
	21st to end	Day	43% 7% 11% 20% 18% 1	4324
August	1st to 10th	Day	53% 7% 12% 20% 8%	4091
	11th to 20th	Day	45% 6% 12% 27% 10% 1	4083
	21st to end	Day	38% 8% 13% 26% 13% 2	4262
September	1st to 10th	Day	42% 6% 10% 22% 18% 3	2280
	11th to 20th	Day	37% 7% 14% 26% 16% 1	2152
	21st to end	Day	49% 6% 11% 20% 13%	2057
October	1st to 10th	Day	38% 5% 10% 29% 18% 1	3160
	11th to 20th	Day	46% 5% 10% 21% 13% 4	3140
	21st to end	Day	40% 4 11% 29% 15% 1	3428
November	1st to 10th	Day	43% 6% 13% 19% 17% 2	1842
	11th to 20th	Day	55% 5% 11% 18% 9% 2	1520
	21st to end	Day	62% 5% 12% 15% 5% 1	1520
December	1st to 10th	Day	73% 5% 9% 10% 3	1520
	11th to 20th	Day	68% 4 11% 14% 3	1906
	21st to end	Day	77% 3 9% 9% 2	2772
January	1st to 10th	Night	72% 3 8% 13% 3	4255
	11th to 20th	Night	74% 5% 10% 9% 2	4120
	21st to end	Night	75% 3 7% 11% 3 1	4532
February	1st to 10th	Night	66% 4 9% 15% 6%	2470
	11th to 20th	Night	64% 4 10% 15% 6%	2405
	21st to end	Night	61% 5% 9% 15% 9% 1	1898
March	1st to 10th	Night	55% 4 9% 24% 7%	3418
	11th to 20th	Night	54% 4 13% 21% 6% 1	3480
	21st to end	Night	47% 4 10% 22% 15% 2	3817
April	1st to 10th	Night	54% 5% 8% 18% 14% 1	1953
	11th to 20th	Night	47% 6% 11% 18% 15% 3	1875
	21st to end	Night	47% 5% 11% 22% 11% 3	1731
May	1st to 10th	Night	55% 6% 9% 17% 11% 2	2840
	11th to 20th	Night	49% 9% 11% 21% 9% 1	2750
	21st to end	Night	36% 10% 13% 23% 12% 5%	2739
June	1st to 10th	Night	37% 8% 13% 26% 15% 2	1520
	11th to 20th	Night	38% 9% 14% 25% 13% 2	1520
	21st to end	Night	39% 9% 12% 23% 16% 1	1520
July	1st to 10th	Night	44% 7% 9% 21% 17% 2	2480
	11th to 20th	Night	36% 7% 14% 25% 16% 1	2740
	21st to end	Night	43% 6% 10% 17% 21% 2	2988
August	1st to 10th	Night	48% 7% 13% 21% 11%	2814
	11th to 20th	Night	43% 6% 9% 30% 11% 1	2812
	21st to end	Night	34% 7% 14% 29% 13% 2	3348
September	1st to 10th	Night	36% 6% 12% 23% 19% 4	1900
	11th to 20th	Night	31% 7% 12% 27% 22% 1	2023
	21st to end	Night	47% 6% 11% 20% 15% 1	2123
October	1st to 10th	Night	37% 5% 8% 26% 23% 1	3800
	11th to 20th	Night	40% 5% 11% 22% 16% 7%	3779
	21st to end	Night	39% 4 11% 26% 19% 1	4120
November	1st to 10th	Night	42% 6% 11% 22% 15% 4	2329
	11th to 20th	Night	55% 5% 10% 19% 10% 2	2660
	21st to end	Night	57% 6% 10% 19% 6% 1	2660
December	1st to 10th	Night	70% 5% 10% 11% 4	2660
	11th to 20th	Night	67% 4 10% 16% 3	3288
	21st to end	Night	73% 6% 9% 10% 2	4884

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	36% 26% 24% 10% 3	229
	11th to 20th	Day	36% 28% 27% 6% 3	270
	21st to end	Day	31% 25% 34% 8% 3	297
February	1st to 10th	Day	33% 25% 34% 7% 1	270
	11th to 20th	Day	39% 26% 29% 6%	270
	21st to end	Day	35% 29% 27% 8%	284
March	1st to 10th	Day	32% 23% 28% 14% 3	460
	11th to 20th	Day	34% 19% 32% 10% 4 1	460
	21st to end	Day	34% 21% 25% 15% 4 1	506
April	1st to 10th	Day	30% 21% 27% 16% 5% 1	460
	11th to 20th	Day	26% 21% 29% 13% 9% 3	452
	21st to end	Day	30% 19% 28% 16% 5% 2	460
May	1st to 10th	Day	31% 15% 27% 16% 8% 3	463
	11th to 20th	Day	24% 17% 27% 19% 9% 4	487
	21st to end	Day	16% 11% 28% 25% 15% 5%	529
June	1st to 10th	Day	18% 14% 29% 24% 12% 3	490
	11th to 20th	Day	20% 12% 26% 26% 12% 4	490
	21st to end	Day	20% 12% 31% 23% 12% 2	490
July	1st to 10th	Day	14% 6% 25% 27% 19% 9%	485
	11th to 20th	Day	12% 7% 29% 29% 16% 7%	484
	21st to end	Day	14% 5% 28% 30% 16% 6%	532
August	1st to 10th	Day	14% 8% 23% 28% 19% 7%	486
	11th to 20th	Day	16% 6% 25% 28% 15% 10%	479
	21st to end	Day	11% 8% 25% 30% 17% 9%	539
September	1st to 10th	Day	17% 9% 23% 26% 17% 8%	490
	11th to 20th	Day	11% 5% 22% 33% 20% 8%	490
	21st to end	Day	27% 11% 23% 22% 12% 4	490
October	1st to 10th	Day	20% 12% 25% 23% 16% 4	490
	11th to 20th	Day	26% 16% 27% 21% 8% 2	490
	21st to end	Day	31% 15% 30% 17% 6%	539
November	1st to 10th	Day	19% 18% 31% 20% 11% 2	421
	11th to 20th	Day	32% 22% 28% 14% 2 2	180
	21st to end	Day	23% 26% 40% 10% 2	180
December	1st to 10th	Day	33% 28% 26% 9% 3 1	180
	11th to 20th	Day	34% 22% 33% 9% 3	180
	21st to end	Day	41% 20% 25% 10% 4	198
January	1st to 10th	Night	28% 23% 33% 12% 4	760
	11th to 20th	Night	33% 20% 31% 14% 3	760
	21st to end	Night	28% 21% 31% 17% 2	836
February	1st to 10th	Night	31% 17% 30% 21% 1	760
	11th to 20th	Night	30% 21% 34% 14% 1	743
	21st to end	Night	30% 19% 32% 18% 2	628
March	1st to 10th	Night	26% 18% 33% 20% 2	760
	11th to 20th	Night	30% 19% 26% 19% 6%	760
	21st to end	Night	25% 16% 35% 19% 5% 1	836
April	1st to 10th	Night	26% 18% 30% 21% 6%	760
	11th to 20th	Night	24% 15% 31% 21% 8% 1	751
	21st to end	Night	20% 11% 35% 27% 6%	591
May	1st to 10th	Night	22% 11% 25% 32% 9% 1	570
	11th to 20th	Night	23% 8% 27% 33% 9%	524
	21st to end	Night	12% 6% 25% 34% 22% 2	411
June	1st to 10th	Night	13% 4 29% 38% 15% 1	380
	11th to 20th	Night	11% 6% 25% 39% 19% 1	380
	21st to end	Night	13% 4 28% 40% 14% 1	380
July	1st to 10th	Night	12% 2 20% 41% 21% 3	370
	11th to 20th	Night	11% 4 16% 39% 26% 3	519
	21st to end	Night	13% 3 16% 41% 26% 1	624
August	1st to 10th	Night	10% 3 16% 46% 23% 2	567
	11th to 20th	Night	14% 4 14% 38% 27% 4	564
	21st to end	Night	11% 4 18% 36% 27% 4	760
September	1st to 10th	Night	16% 4 21% 33% 22% 3	760
	11th to 20th	Night	12% 5% 17% 34% 28% 4	760
	21st to end	Night	21% 10% 21% 28% 16% 4	760
October	1st to 10th	Night	19% 8% 23% 29% 19% 1	760
	11th to 20th	Night	23% 13% 28% 26% 9% 1	760
	21st to end	Night	29% 13% 26% 26% 6%	836
November	1st to 10th	Night	20% 11% 29% 29% 11%	760
	11th to 20th	Night	28% 15% 27% 22% 7% 1	760
	21st to end	Night	29% 16% 31% 19% 6%	760
December	1st to 10th	Night	33% 20% 26% 16% 4	760
	11th to 20th	Night	30% 22% 28% 17% 4	760
	21st to end	Night	31% 18% 30% 18% 2	836

Page generated at 2024-11-03 02:11:09. Version ac07

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