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 2024-01-12.

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	18% 10% 4 7% 6% 3 5% 5% 5% 7% 30%	74625
	Night	18% 11% 4 7% 6% 3 4 4 5% 6% 32%	75084
Transparency	Day	53% 6% 11% 18% 10% 1	74339
	Night	52% 6% 11% 19% 11% 2	74889
Seeing	Day	24% 15% 27% 20% 10% 4	13552
	Night	23% 13% 27% 25% 11% 1	23252

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	18% 15% 10% 12% 8% 3 5% 3 3 4 19%	1621
	11th to 20th	Day	19% 19% 8% 12% 9% 3 3 3 3 4 18%	1629
	21st to end	Day	18% 16% 9% 14% 8% 4 3 4 3 4 15%	1782
February	1st to 10th	Day	21% 17% 7% 10% 9% 4 4 3 3 4 18%	1620
	11th to 20th	Day	19% 14% 7% 12% 7% 4 5% 4 4 5% 20%	1573
	21st to end	Day	21% 14% 5% 10% 6% 4 3 3 3 6% 23%	1463
March	1st to 10th	Day	16% 12% 6% 9% 6% 2 4 4 4 6% 30%	1980
	11th to 20th	Day	20% 14% 4 7% 5% 3 5% 4 4 6% 28%	1980
	21st to end	Day	22% 12% 5% 8% 6% 3 4 4 4 6% 27%	2178
April	1st to 10th	Day	17% 13% 4 6% 4 3 5% 5% 6% 7% 30%	2107
	11th to 20th	Day	19% 11% 3 7% 5% 4 5% 4 5% 5% 33%	2134
	21st to end	Day	24% 9% 3 6% 4 3 3 4 4 6% 33%	2334
May	1st to 10th	Day	21% 9% 4 7% 5% 4 5% 5% 6% 7% 28%	2340
	11th to 20th	Day	24% 7% 2 6% 6% 3 5% 5% 5% 6% 30%	2331
	21st to end	Day	14% 6% 2 5% 6% 3 5% 6% 7% 9% 38%	2725
June	1st to 10th	Day	16% 7% 3 6% 6% 4 6% 5% 7% 8% 33%	2520
	11th to 20th	Day	17% 7% 3 6% 5% 3 5% 5% 7% 9% 34%	2520
	21st to end	Day	16% 5% 3 5% 5% 3 5% 5% 6% 10% 37%	2520
July	1st to 10th	Day	14% 6% 2 5% 6% 4 5% 6% 6% 8% 38%	2520
	11th to 20th	Day	13% 6% 3 5% 5% 3 5% 6% 7% 10% 36%	2370
	21st to end	Day	13% 6% 3 7% 7% 4 7% 7% 6% 8% 34%	2547
August	1st to 10th	Day	12% 6% 2 6% 7% 4 7% 7% 7% 9% 32%	2327
	11th to 20th	Day	15% 5% 3 7% 6% 3 5% 6% 6% 9% 33%	2303
	21st to end	Day	14% 6% 2 5% 6% 4 5% 6% 7% 10% 36%	2430
September	1st to 10th	Day	19% 6% 3 4 4 3 4 4 4 7% 41%	2160
	11th to 20th	Day	14% 6% 2 4 4 3 4 5% 6% 8% 42%	2039
	21st to end	Day	21% 6% 3 6% 4 2 4 5% 5% 8% 36%	1949
October	1st to 10th	Day	19% 7% 2 6% 5% 3 4 4 6% 8% 36%	1800
	11th to 20th	Day	23% 9% 3 6% 5% 3 5% 4 5% 5% 33%	1800
	21st to end	Day	26% 11% 3 6% 5% 2 4 5% 4 6% 28%	1980
November	1st to 10th	Day	13% 8% 3 6% 5% 4 4 4 5% 7% 40%	1801
	11th to 20th	Day	19% 14% 4 6% 5% 2 5% 4 5% 6% 30%	1520
	21st to end	Day	20% 17% 6% 6% 6% 3 4 4 5% 5% 24%	1520
December	1st to 10th	Day	22% 19% 10% 10% 5% 4 3 3 3 3 17%	1520
	11th to 20th	Day	20% 18% 8% 10% 5% 2 3 4 3 6% 20%	1910
	21st to end	Day	28% 22% 7% 9% 5% 2 3 3 3 3 14%	2772
January	1st to 10th	Night	19% 17% 8% 10% 7% 3 4 4 4 5% 19%	2540
	11th to 20th	Night	21% 16% 7% 11% 7% 3 5% 4 4 5% 17%	2360
	21st to end	Night	18% 16% 8% 10% 7% 3 5% 4 4 5% 21%	2574
February	1st to 10th	Night	21% 13% 6% 11% 8% 4 5% 3 3 4 22%	2340
	11th to 20th	Night	20% 13% 5% 11% 7% 3 5% 4 4 6% 22%	2273
	21st to end	Night	21% 12% 5% 9% 7% 3 5% 4 4 5% 24%	1790
March	1st to 10th	Night	18% 10% 5% 7% 6% 3 4 5% 5% 6% 31%	1980
	11th to 20th	Night	21% 11% 4 6% 5% 3 3 3 4 5% 35%	1980
	21st to end	Night	19% 12% 4 6% 5% 3 4 3 4 6% 34%	2178
April	1st to 10th	Night	19% 12% 4 7% 5% 3 4 4 4 5% 33%	1851
	11th to 20th	Night	17% 9% 2 7% 4 2 5% 5% 5% 6% 38%	1775
	21st to end	Night	17% 9% 3 6% 6% 3 5% 3 5% 8% 35%	1640
May	1st to 10th	Night	20% 7% 3 6% 6% 3 5% 5% 5% 7% 34%	1620
	11th to 20th	Night	18% 8% 3 6% 4 3 4 5% 4 8% 37%	1557
	21st to end	Night	12% 5% 2 6% 4 3 4 5% 6% 10% 44%	1550
June	1st to 10th	Night	12% 6% 2 5% 5% 3 4 6% 5% 8% 45%	1440
	11th to 20th	Night	13% 6% 3 5% 4 4 5% 4 7% 10% 40%	1440
	21st to end	Night	13% 4 2 5% 5% 3 5% 6% 6% 10% 41%	1440
July	1st to 10th	Night	10% 6% 2 5% 5% 3 5% 4 5% 7% 46%	1440
	11th to 20th	Night	11% 4 2 5% 5% 2 5% 5% 7% 9% 45%	1586
	21st to end	Night	12% 6% 2 5% 5% 3 5% 6% 7% 10% 39%	1771
August	1st to 10th	Night	9% 5% 2 6% 5% 3 5% 5% 5% 9% 45%	1611
	11th to 20th	Night	13% 6% 2 6% 5% 3 4 4 5% 8% 44%	1598
	21st to end	Night	12% 5% 2 4 5% 3 4 6% 7% 9% 44%	1908
September	1st to 10th	Night	14% 5% 2 5% 4 3 4 4 5% 6% 48%	1800
	11th to 20th	Night	11% 3 2 5% 4 2 3 4 6% 7% 51%	1916
	21st to end	Night	18% 6% 3 5% 5% 3 4 3 5% 7% 40%	2011
October	1st to 10th	Night	16% 6% 2 5% 5% 3 5% 5% 5% 6% 42%	2160
	11th to 20th	Night	21% 7% 3 5% 5% 3 4 4 4 6% 38%	2160
	21st to end	Night	26% 9% 3 4 5% 2 4 4 4 6% 31%	2376
November	1st to 10th	Night	15% 9% 3 5% 4 3 4 4 5% 6% 42%	2270
	11th to 20th	Night	19% 12% 5% 6% 5% 3 5% 5% 5% 6% 30%	2660
	21st to end	Night	20% 13% 4 7% 5% 3 4 5% 5% 6% 28%	2660
December	1st to 10th	Night	23% 16% 10% 9% 6% 3 4 4 4 5% 17%	2660
	11th to 20th	Night	20% 16% 7% 10% 7% 2 3 4 4 5% 22%	3285
	21st to end	Night	25% 20% 7% 8% 6% 3 4 4 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	70% 4 9% 11% 5%	1622
	11th to 20th	Day	72% 4 10% 10% 3	1629
	21st to end	Day	74% 4 9% 9% 4 1	1782
February	1st to 10th	Day	73% 3 8% 11% 5%	1620
	11th to 20th	Day	68% 4 9% 13% 5%	1582
	21st to end	Day	64% 4 9% 15% 7% 1	1463
March	1st to 10th	Day	55% 6% 11% 19% 8%	1980
	11th to 20th	Day	58% 5% 10% 17% 9% 2	1980
	21st to end	Day	59% 5% 8% 17% 10% 1	2178
April	1st to 10th	Day	53% 6% 10% 17% 11% 2	2107
	11th to 20th	Day	53% 5% 10% 16% 14% 2	2134
	21st to end	Day	53% 4 10% 19% 12% 2	2334
May	1st to 10th	Day	53% 8% 10% 18% 9% 2	2340
	11th to 20th	Day	54% 7% 10% 15% 12% 2	2335
	21st to end	Day	41% 10% 16% 22% 9% 2	2725
June	1st to 10th	Day	47% 9% 11% 22% 10% 1	2520
	11th to 20th	Day	46% 9% 12% 20% 12% 1	2520
	21st to end	Day	42% 9% 11% 26% 11% 1	2520
July	1st to 10th	Day	43% 9% 10% 21% 13% 3	2450
	11th to 20th	Day	42% 8% 12% 24% 13% 1	2299
	21st to end	Day	43% 10% 12% 19% 14% 1	2405
August	1st to 10th	Day	44% 9% 14% 25% 8%	2314
	11th to 20th	Day	45% 8% 14% 21% 10% 1	2303
	21st to end	Day	41% 10% 12% 21% 13% 3	2430
September	1st to 10th	Day	43% 6% 10% 21% 16% 3	2160
	11th to 20th	Day	38% 7% 14% 26% 14% 1	2039
	21st to end	Day	47% 6% 11% 21% 14% 1	1949
October	1st to 10th	Day	45% 7% 12% 20% 14% 1	1800
	11th to 20th	Day	52% 6% 11% 23% 8%	1800
	21st to end	Day	57% 6% 12% 16% 9% 1	1980
November	1st to 10th	Day	44% 6% 13% 19% 16% 2	1801
	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	68% 4 9% 15% 4 1	2540
	11th to 20th	Night	70% 5% 11% 11% 3	2360
	21st to end	Night	67% 4 10% 13% 5% 1	2574
February	1st to 10th	Night	67% 4 9% 14% 5%	2340
	11th to 20th	Night	65% 4 10% 14% 6%	2275
	21st to end	Night	62% 5% 8% 15% 9% 1	1790
March	1st to 10th	Night	54% 4 9% 20% 11%	1980
	11th to 20th	Night	53% 4 12% 20% 9% 2	1980
	21st to end	Night	52% 5% 8% 17% 15% 3	2178
April	1st to 10th	Night	53% 5% 8% 18% 14% 1	1851
	11th to 20th	Night	46% 6% 11% 18% 15% 3	1775
	21st to end	Night	48% 5% 11% 22% 11% 3	1640
May	1st to 10th	Night	49% 7% 9% 19% 13% 4	1620
	11th to 20th	Night	46% 7% 11% 18% 15% 2	1558
	21st to end	Night	35% 8% 15% 26% 14% 2	1551
June	1st to 10th	Night	37% 8% 13% 26% 14% 2	1440
	11th to 20th	Night	39% 9% 13% 24% 13% 2	1440
	21st to end	Night	38% 9% 12% 23% 16% 1	1440
July	1st to 10th	Night	38% 10% 11% 21% 17% 4	1400
	11th to 20th	Night	32% 8% 14% 24% 18% 2	1534
	21st to end	Night	39% 9% 14% 21% 14% 3	1672
August	1st to 10th	Night	35% 8% 15% 25% 16% 1	1600
	11th to 20th	Night	38% 8% 12% 27% 13% 2	1598
	21st to end	Night	35% 9% 14% 25% 14% 4	1908
September	1st to 10th	Night	37% 6% 12% 23% 18% 4	1800
	11th to 20th	Night	31% 7% 12% 27% 21% 1	1916
	21st to end	Night	45% 6% 12% 20% 16% 1	2011
October	1st to 10th	Night	41% 8% 12% 23% 14% 2	2160
	11th to 20th	Night	47% 6% 11% 22% 13% 1	2160
	21st to end	Night	54% 5% 10% 19% 10% 1	2376
November	1st to 10th	Night	42% 6% 11% 22% 15% 4	2270
	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	37% 25% 24% 10% 3	229
	11th to 20th	Day	34% 27% 29% 7% 3	243
	21st to end	Day	30% 27% 33% 8% 3	264
February	1st to 10th	Day	35% 26% 36% 3 1	240
	11th to 20th	Day	40% 25% 30% 5%	240
	21st to end	Day	35% 30% 27% 7%	253
March	1st to 10th	Day	32% 24% 29% 13% 2	420
	11th to 20th	Day	33% 19% 33% 10% 4 1	420
	21st to end	Day	34% 21% 26% 15% 4 1	462
April	1st to 10th	Day	29% 21% 27% 16% 6% 1	420
	11th to 20th	Day	25% 21% 29% 13% 10% 3	412
	21st to end	Day	31% 18% 27% 16% 5% 2	420
May	1st to 10th	Day	31% 16% 27% 16% 8% 3	423
	11th to 20th	Day	26% 16% 28% 19% 9% 3	447
	21st to end	Day	16% 12% 27% 24% 16% 6%	485
June	1st to 10th	Day	18% 13% 30% 26% 11% 3	450
	11th to 20th	Day	21% 13% 24% 25% 12% 4	450
	21st to end	Day	20% 11% 32% 24% 13% 2	450
July	1st to 10th	Day	15% 6% 22% 27% 20% 10%	445
	11th to 20th	Day	12% 7% 29% 30% 16% 7%	444
	21st to end	Day	15% 5% 28% 30% 16% 7%	488
August	1st to 10th	Day	12% 8% 23% 29% 20% 8%	446
	11th to 20th	Day	16% 6% 25% 28% 15% 10%	439
	21st to end	Day	12% 9% 25% 29% 16% 9%	495
September	1st to 10th	Day	17% 9% 23% 26% 16% 9%	450
	11th to 20th	Day	12% 5% 23% 33% 20% 8%	450
	21st to end	Day	24% 12% 24% 23% 14% 4	450
October	1st to 10th	Day	20% 12% 25% 23% 16% 5%	450
	11th to 20th	Day	27% 16% 28% 21% 8% 1	450
	21st to end	Day	33% 14% 30% 17% 6%	495
November	1st to 10th	Day	19% 19% 29% 20% 11% 2	404
	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% 19% 31% 14% 3	727
	21st to end	Night	28% 21% 31% 17% 2	792
February	1st to 10th	Night	32% 17% 30% 20% 1	720
	11th to 20th	Night	30% 20% 35% 13% 1	703
	21st to end	Night	30% 19% 32% 17% 2	592
March	1st to 10th	Night	25% 19% 34% 20% 2	720
	11th to 20th	Night	29% 18% 27% 19% 6%	720
	21st to end	Night	25% 15% 34% 20% 5% 1	792
April	1st to 10th	Night	26% 17% 30% 21% 6%	720
	11th to 20th	Night	24% 15% 32% 20% 9% 1	711
	21st to end	Night	20% 11% 36% 26% 6%	560
May	1st to 10th	Night	21% 11% 25% 32% 9% 1	540
	11th to 20th	Night	23% 7% 28% 33% 8%	496
	21st to end	Night	12% 5% 26% 33% 22% 2	389
June	1st to 10th	Night	13% 4 28% 39% 15% 1	360
	11th to 20th	Night	11% 6% 25% 38% 19% 1	360
	21st to end	Night	12% 4 28% 41% 15%	360
July	1st to 10th	Night	11% 3 20% 41% 22% 3	350
	11th to 20th	Night	11% 5% 17% 38% 26% 4	490
	21st to end	Night	13% 3 17% 39% 27% 1	591
August	1st to 10th	Night	9% 3 16% 46% 23% 2	537
	11th to 20th	Night	13% 4 14% 38% 28% 4	534
	21st to end	Night	12% 4 19% 35% 27% 4	720
September	1st to 10th	Night	16% 4 21% 33% 23% 3	720
	11th to 20th	Night	12% 5% 18% 34% 27% 4	720
	21st to end	Night	20% 10% 22% 28% 17% 4	720
October	1st to 10th	Night	19% 9% 23% 29% 19% 2	720
	11th to 20th	Night	24% 13% 28% 27% 8% 1	720
	21st to end	Night	30% 14% 26% 25% 5%	792
November	1st to 10th	Night	20% 11% 29% 29% 11%	740
	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 2024-01-09 07:14:44. Version ac07

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