Newfound Gap
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Newfound Gap clear sky chart from 2005-11-06 to 2024-04-25.

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% 9% 4 7% 6% 4 5% 5% 5% 7% 34%	83660
	Night	13% 10% 4 7% 6% 3 5% 5% 5% 7% 35%	85460
Transparency	Day	47% 7% 11% 17% 14% 4	83383
	Night	44% 8% 12% 18% 14% 4	85256
Seeing	Day	22% 11% 21% 23% 16% 8%	14163
	Night	20% 8% 18% 29% 20% 3	24317

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	12% 9% 4 7% 8% 5% 5% 6% 6% 6% 32%	2836
	11th to 20th	Day	11% 11% 6% 11% 6% 4 4 5% 5% 4 34%	2840
	21st to end	Day	13% 14% 6% 9% 5% 4 3 4 4 5% 34%	3124
February	1st to 10th	Day	15% 9% 5% 10% 8% 3 5% 4 4 5% 32%	1853
	11th to 20th	Day	18% 11% 5% 8% 6% 3 4 4 4 6% 32%	1848
	21st to end	Day	16% 11% 4 9% 6% 3 4 5% 5% 5% 33%	1570
March	1st to 10th	Day	19% 9% 4 7% 5% 3 4 4 4 6% 34%	3275
	11th to 20th	Day	14% 8% 3 5% 5% 3 3 4 4 4 47%	3480
	21st to end	Day	15% 12% 4 7% 5% 3 4 4 5% 5% 36%	3815
April	1st to 10th	Day	12% 10% 3 6% 6% 3 5% 5% 6% 6% 37%	2095
	11th to 20th	Day	15% 9% 3 6% 5% 3 4 4 5% 7% 38%	2300
	21st to end	Day	16% 9% 3 5% 6% 3 4 4 5% 6% 37%	2394
May	1st to 10th	Day	16% 7% 3 7% 6% 4 5% 5% 5% 6% 35%	2340
	11th to 20th	Day	19% 7% 4 8% 7% 5% 5% 6% 5% 6% 28%	2301
	21st to end	Day	15% 7% 4 7% 6% 4 6% 6% 7% 8% 28%	2531
June	1st to 10th	Day	14% 7% 4 7% 7% 5% 8% 6% 7% 9% 27%	2340
	11th to 20th	Day	9% 7% 4 8% 9% 5% 8% 7% 7% 9% 28%	2340
	21st to end	Day	12% 7% 4 7% 8% 4 7% 6% 7% 10% 29%	2340
July	1st to 10th	Day	13% 9% 5% 8% 9% 5% 8% 6% 7% 9% 20%	2340
	11th to 20th	Day	15% 8% 3 8% 8% 6% 7% 8% 8% 8% 21%	2340
	21st to end	Day	14% 7% 4 8% 9% 5% 7% 7% 8% 8% 22%	2547
August	1st to 10th	Day	15% 8% 3 8% 7% 5% 8% 8% 8% 9% 22%	2327
	11th to 20th	Day	16% 8% 4 8% 9% 6% 6% 6% 6% 8% 25%	2302
	21st to end	Day	16% 8% 3 8% 8% 5% 7% 7% 7% 7% 24%	2357
September	1st to 10th	Day	14% 8% 3 9% 7% 4 6% 6% 6% 8% 31%	1980
	11th to 20th	Day	18% 9% 3 6% 5% 3 4 6% 6% 7% 31%	1980
	21st to end	Day	15% 6% 3 6% 6% 3 5% 5% 6% 6% 39%	1980
October	1st to 10th	Day	13% 8% 2 5% 4 4 5% 4 5% 6% 44%	1980
	11th to 20th	Day	13% 9% 3 5% 3 2 3 3 4 6% 48%	1814
	21st to end	Day	14% 8% 2 4 4 2 4 3 4 8% 47%	1980
November	1st to 10th	Day	11% 8% 2 5% 3 2 3 3 5% 6% 52%	1704
	11th to 20th	Day	11% 8% 3 7% 5% 3 4 4 5% 5% 45%	1710
	21st to end	Day	13% 9% 2 6% 4 2 5% 5% 5% 6% 42%	1710
December	1st to 10th	Day	17% 10% 4 8% 6% 3 6% 4 4 5% 31%	1710
	11th to 20th	Day	11% 11% 4 6% 6% 5% 5% 5% 5% 5% 37%	2153
	21st to end	Day	12% 9% 6% 8% 6% 4 5% 4 5% 6% 35%	3124
January	1st to 10th	Night	12% 14% 5% 8% 8% 4 5% 4 4 5% 30%	4109
	11th to 20th	Night	16% 12% 4 7% 5% 2 5% 6% 4 5% 33%	4120
	21st to end	Night	15% 15% 6% 8% 5% 3 4 5% 3 4 31%	4532
February	1st to 10th	Night	13% 11% 5% 7% 7% 4 4 5% 5% 5% 34%	2323
	11th to 20th	Night	17% 12% 5% 10% 6% 3 4 5% 4 4 31%	2218
	21st to end	Night	17% 11% 5% 9% 6% 3 6% 4 5% 6% 29%	1884
March	1st to 10th	Night	17% 14% 6% 8% 6% 4 5% 6% 5% 5% 25%	3576
	11th to 20th	Night	13% 8% 4 7% 5% 3 5% 4 5% 6% 41%	3480
	21st to end	Night	14% 9% 4 7% 6% 3 5% 5% 5% 6% 37%	3817
April	1st to 10th	Night	13% 11% 4 6% 5% 3 4 4 4 6% 40%	2090
	11th to 20th	Night	12% 12% 3 6% 5% 3 4 4 5% 6% 41%	1839
	21st to end	Night	14% 8% 2 5% 5% 3 5% 4 5% 8% 40%	1665
May	1st to 10th	Night	16% 10% 2 5% 6% 3 5% 6% 5% 7% 36%	1620
	11th to 20th	Night	16% 6% 3 7% 5% 4 5% 5% 6% 9% 33%	1592
	21st to end	Night	10% 6% 3 7% 6% 4 7% 6% 7% 9% 34%	1744
June	1st to 10th	Night	10% 6% 3 6% 7% 4 6% 7% 9% 11% 31%	1620
	11th to 20th	Night	7% 5% 2 5% 5% 4 7% 7% 8% 12% 38%	1620
	21st to end	Night	10% 6% 3 5% 7% 4 6% 7% 6% 10% 36%	1620
July	1st to 10th	Night	12% 6% 4 7% 7% 4 5% 8% 7% 9% 30%	1620
	11th to 20th	Night	10% 5% 2 6% 7% 4 6% 7% 10% 11% 31%	1620
	21st to end	Night	9% 6% 4 6% 6% 4 7% 7% 8% 11% 30%	1771
August	1st to 10th	Night	11% 5% 3 6% 6% 4 7% 6% 8% 10% 36%	1611
	11th to 20th	Night	11% 6% 3 7% 9% 5% 6% 6% 7% 8% 32%	1598
	21st to end	Night	12% 7% 4 7% 6% 4 6% 6% 6% 9% 32%	1977
September	1st to 10th	Night	12% 7% 3 6% 6% 4 5% 6% 6% 7% 37%	1980
	11th to 20th	Night	14% 8% 2 6% 6% 3 4 4 5% 8% 39%	1980
	21st to end	Night	13% 7% 2 6% 5% 3 5% 4 5% 5% 44%	1980
October	1st to 10th	Night	13% 7% 2 5% 4 2 3 4 5% 6% 48%	1980
	11th to 20th	Night	15% 7% 2 5% 5% 3 4 4 4 5% 45%	2144
	21st to end	Night	12% 9% 2 5% 4 2 4 4 5% 5% 47%	2376
November	1st to 10th	Night	12% 9% 3 4 5% 3 4 4 4 5% 47%	2370
	11th to 20th	Night	12% 9% 4 6% 4 2 4 4 5% 5% 44%	2470
	21st to end	Night	12% 9% 4 7% 5% 3 4 4 5% 6% 41%	2470
December	1st to 10th	Night	15% 13% 5% 9% 7% 4 5% 4 5% 5% 28%	2470
	11th to 20th	Night	13% 13% 5% 9% 6% 4 4 4 4 5% 35%	3042
	21st to end	Night	14% 10% 7% 10% 8% 4 5% 6% 5% 7% 25%	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	43% 6% 6% 18% 20% 5%	2837
	11th to 20th	Day	48% 5% 7% 13% 23% 4	2840
	21st to end	Day	48% 5% 7% 17% 20% 4	3124
February	1st to 10th	Day	48% 5% 11% 16% 15% 5%	1853
	11th to 20th	Day	50% 6% 8% 16% 16% 5%	1858
	21st to end	Day	51% 5% 9% 12% 17% 6%	1570
March	1st to 10th	Day	47% 6% 8% 16% 14% 8%	3275
	11th to 20th	Day	39% 5% 8% 19% 20% 9%	3480
	21st to end	Day	47% 5% 9% 24% 10% 4	3815
April	1st to 10th	Day	42% 7% 11% 20% 17% 3	2095
	11th to 20th	Day	45% 5% 9% 18% 20% 4	2300
	21st to end	Day	45% 5% 11% 23% 13% 2	2394
May	1st to 10th	Day	45% 8% 13% 21% 12% 2	2340
	11th to 20th	Day	53% 9% 11% 17% 9% 1	2305
	21st to end	Day	49% 9% 13% 20% 9% 1	2531
June	1st to 10th	Day	50% 10% 15% 17% 7%	2340
	11th to 20th	Day	48% 10% 17% 15% 9% 1	2340
	21st to end	Day	45% 11% 16% 16% 9% 3	2340
July	1st to 10th	Day	55% 12% 14% 14% 5%	2275
	11th to 20th	Day	54% 13% 15% 10% 7% 1	2271
	21st to end	Day	52% 12% 16% 13% 6%	2405
August	1st to 10th	Day	55% 11% 15% 15% 4	2314
	11th to 20th	Day	54% 11% 13% 14% 8% 1	2302
	21st to end	Day	55% 9% 12% 14% 7% 2	2357
September	1st to 10th	Day	49% 8% 11% 16% 13% 3	1980
	11th to 20th	Day	50% 7% 9% 18% 14% 1	1980
	21st to end	Day	43% 7% 11% 19% 15% 5%	1980
October	1st to 10th	Day	38% 7% 10% 19% 21% 5%	1980
	11th to 20th	Day	36% 6% 9% 20% 21% 9%	1814
	21st to end	Day	35% 4 7% 23% 22% 9%	1980
November	1st to 10th	Day	32% 4 8% 18% 28% 9%	1704
	11th to 20th	Day	35% 4 8% 22% 23% 8%	1710
	21st to end	Day	41% 4 8% 19% 22% 6%	1710
December	1st to 10th	Day	51% 6% 7% 17% 14% 4	1710
	11th to 20th	Day	43% 5% 9% 16% 18% 8%	2150
	21st to end	Day	48% 7% 9% 20% 14% 3	3124
January	1st to 10th	Night	48% 5% 7% 17% 17% 6%	4109
	11th to 20th	Night	46% 6% 7% 14% 20% 7%	4120
	21st to end	Night	54% 3 8% 11% 17% 6%	4532
February	1st to 10th	Night	46% 6% 11% 16% 18% 3	2323
	11th to 20th	Night	53% 4 8% 16% 14% 4	2219
	21st to end	Night	54% 6% 8% 13% 14% 5%	1884
March	1st to 10th	Night	52% 10% 10% 12% 11% 4	3576
	11th to 20th	Night	37% 6% 11% 23% 15% 8%	3480
	21st to end	Night	44% 7% 11% 21% 12% 4	3817
April	1st to 10th	Night	40% 7% 13% 21% 16% 3	2090
	11th to 20th	Night	40% 5% 12% 20% 19% 4	1839
	21st to end	Night	39% 7% 13% 28% 12% 1	1665
May	1st to 10th	Night	43% 8% 16% 23% 8% 2	1620
	11th to 20th	Night	46% 10% 16% 20% 8%	1593
	21st to end	Night	42% 10% 16% 23% 8% 1	1745
June	1st to 10th	Night	44% 12% 18% 19% 7% 1	1620
	11th to 20th	Night	32% 14% 25% 20% 7% 1	1620
	21st to end	Night	37% 14% 17% 20% 10% 2	1620
July	1st to 10th	Night	44% 14% 17% 16% 8%	1575
	11th to 20th	Night	39% 16% 24% 13% 6% 2	1566
	21st to end	Night	39% 15% 22% 17% 6%	1672
August	1st to 10th	Night	42% 14% 20% 19% 6%	1600
	11th to 20th	Night	45% 13% 17% 17% 9%	1598
	21st to end	Night	43% 11% 20% 18% 7% 1	1977
September	1st to 10th	Night	42% 11% 14% 19% 11% 3	1980
	11th to 20th	Night	44% 9% 12% 20% 14%	1980
	21st to end	Night	40% 7% 11% 20% 19% 3	1980
October	1st to 10th	Night	35% 6% 12% 20% 23% 4	1980
	11th to 20th	Night	38% 6% 9% 23% 18% 5%	2144
	21st to end	Night	35% 5% 8% 23% 23% 7%	2376
November	1st to 10th	Night	36% 4 10% 20% 23% 7%	2370
	11th to 20th	Night	38% 4 8% 19% 22% 9%	2470
	21st to end	Night	42% 4 8% 22% 20% 5%	2470
December	1st to 10th	Night	52% 7% 9% 15% 13% 4	2470
	11th to 20th	Night	45% 5% 9% 16% 20% 5%	3044
	21st to end	Night	53% 8% 9% 17% 12% 2	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	34% 25% 24% 14% 2	270
	11th to 20th	Day	42% 16% 24% 16% 2	270
	21st to end	Day	29% 27% 29% 12% 3	297
February	1st to 10th	Day	31% 17% 35% 13% 3	270
	11th to 20th	Day	47% 22% 23% 7% 1	270
	21st to end	Day	42% 22% 28% 6% 2	225
March	1st to 10th	Day	32% 14% 30% 18% 6%	360
	11th to 20th	Day	30% 19% 29% 17% 4 1	460
	21st to end	Day	27% 20% 24% 21% 7% 1	506
April	1st to 10th	Day	29% 13% 25% 23% 9% 2	460
	11th to 20th	Day	24% 18% 23% 22% 11% 3	452
	21st to end	Day	25% 10% 27% 19% 14% 4	437
May	1st to 10th	Day	21% 17% 26% 20% 10% 6%	423
	11th to 20th	Day	19% 8% 21% 29% 14% 9%	447
	21st to end	Day	20% 6% 16% 25% 18% 15%	485
June	1st to 10th	Day	19% 6% 17% 26% 20% 11%	450
	11th to 20th	Day	10% 5% 16% 29% 24% 16%	450
	21st to end	Day	12% 6% 24% 26% 18% 14%	450
July	1st to 10th	Day	14% 4 13% 25% 28% 17%	445
	11th to 20th	Day	12% 6% 11% 28% 24% 20%	444
	21st to end	Day	11% 3 10% 24% 32% 19%	488
August	1st to 10th	Day	20% 6% 12% 21% 22% 19%	446
	11th to 20th	Day	13% 5% 13% 29% 26% 14%	439
	21st to end	Day	16% 4 9% 24% 28% 19%	495
September	1st to 10th	Day	13% 4 12% 26% 31% 14%	450
	11th to 20th	Day	17% 4 12% 25% 28% 14%	450
	21st to end	Day	17% 6% 12% 31% 27% 7%	450
October	1st to 10th	Day	17% 8% 18% 27% 22% 8%	450
	11th to 20th	Day	16% 13% 22% 26% 21% 2	450
	21st to end	Day	22% 11% 22% 28% 16% 2	495
November	1st to 10th	Day	20% 11% 28% 25% 13% 3	302
	11th to 20th	Day	23% 16% 30% 25% 7%	270
	21st to end	Day	22% 16% 30% 21% 9% 1	270
December	1st to 10th	Day	34% 16% 30% 14% 6%	270
	11th to 20th	Day	27% 14% 30% 21% 6% 1	270
	21st to end	Day	35% 13% 31% 14% 7%	297
January	1st to 10th	Night	28% 13% 28% 26% 4	760
	11th to 20th	Night	31% 12% 29% 23% 5%	760
	21st to end	Night	25% 13% 33% 27% 2	836
February	1st to 10th	Night	22% 12% 33% 30% 3	760
	11th to 20th	Night	29% 13% 34% 23% 1	743
	21st to end	Night	32% 15% 31% 18% 3	628
March	1st to 10th	Night	26% 11% 29% 29% 5%	760
	11th to 20th	Night	25% 13% 26% 28% 8% 1	760
	21st to end	Night	24% 12% 26% 29% 9%	836
April	1st to 10th	Night	21% 15% 24% 29% 11% 1	760
	11th to 20th	Night	23% 9% 22% 30% 15% 2	573
	21st to end	Night	19% 6% 20% 39% 16% 1	555
May	1st to 10th	Night	17% 10% 18% 35% 17% 2	540
	11th to 20th	Night	18% 6% 15% 33% 24% 4	531
	21st to end	Night	13% 4 7% 33% 37% 6%	584
June	1st to 10th	Night	14% 4 8% 34% 34% 5%	540
	11th to 20th	Night	9% 2 9% 30% 41% 10%	540
	21st to end	Night	12% 3 6% 32% 41% 7%	540
July	1st to 10th	Night	12% 4 4 25% 47% 9%	525
	11th to 20th	Night	12% 4 3 23% 44% 14%	522
	21st to end	Night	8% 4 3 24% 50% 10%	591
August	1st to 10th	Night	14% 4 3 23% 47% 10%	537
	11th to 20th	Night	16% 2 4 30% 39% 8%	534
	21st to end	Night	15% 3 2 22% 46% 11%	594
September	1st to 10th	Night	13% 4 6% 28% 41% 8%	720
	11th to 20th	Night	19% 4 7% 28% 36% 7%	720
	21st to end	Night	17% 5% 11% 30% 34% 3	720
October	1st to 10th	Night	18% 6% 14% 24% 32% 7%	720
	11th to 20th	Night	19% 8% 18% 32% 20% 2	720
	21st to end	Night	20% 9% 16% 38% 15% 3	792
November	1st to 10th	Night	18% 6% 18% 36% 19% 3	740
	11th to 20th	Night	19% 10% 21% 36% 12% 2	760
	21st to end	Night	22% 9% 21% 34% 13% 1	760
December	1st to 10th	Night	26% 13% 23% 30% 8%	760
	11th to 20th	Night	23% 11% 26% 33% 7% 1	760
	21st to end	Night	31% 9% 24% 31% 6%	836

Page generated at 2024-04-22 09:25:45. Version ac07

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