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 2025-10-04.

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	13% 9% 3 8% 5% 5% 5% 4 6% 7% 33%	126237
	Night	13% 10% 4 8% 5% 4 5% 4 5% 7% 35%	123128
Transparency	Day	44% 8% 11% 18% 14% 5%	129974
	Night	41% 7% 13% 18% 15% 6%	127460
Seeing	Day	22% 12% 21% 23% 15% 7%	16146
	Night	20% 9% 19% 29% 20% 3	26151

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	10% 11% 5% 9% 5% 5% 3 4 5% 5% 39%	4056
	11th to 20th	Day	8% 10% 5% 11% 4 4 3 3 4 4 44%	4060
	21st to end	Day	12% 13% 4 9% 4 5% 4 3 5% 5% 37%	4466
February	1st to 10th	Day	14% 10% 4 11% 6% 5% 4 4 4 5% 33%	1951
	11th to 20th	Day	17% 12% 4 9% 5% 5% 4 3 4 5% 31%	1948
	21st to end	Day	15% 12% 3 9% 5% 3 4 4 5% 5% 34%	1650
March	1st to 10th	Day	16% 9% 4 9% 4 5% 4 3 5% 6% 36%	4705
	11th to 20th	Day	11% 10% 3 7% 4 3 3 3 4 6% 46%	4980
	21st to end	Day	14% 11% 3 7% 4 4 4 3 4 5% 40%	5465
April	1st to 10th	Day	12% 11% 3 6% 5% 5% 5% 4 6% 6% 37%	2205
	11th to 20th	Day	14% 9% 3 7% 5% 4 4 4 5% 7% 39%	2423
	21st to end	Day	15% 10% 3 7% 5% 5% 4 3 5% 6% 36%	2600
May	1st to 10th	Day	17% 10% 4 10% 6% 6% 6% 4 6% 6% 26%	5862
	11th to 20th	Day	16% 10% 4 11% 7% 7% 6% 4 6% 7% 22%	5861
	21st to end	Day	16% 8% 4 8% 5% 5% 6% 5% 6% 8% 29%	6433
June	1st to 10th	Day	13% 8% 3 9% 6% 7% 8% 5% 7% 8% 27%	2600
	11th to 20th	Day	8% 8% 3 9% 7% 8% 7% 6% 8% 9% 27%	2600
	21st to end	Day	12% 7% 3 8% 7% 6% 7% 5% 7% 9% 29%	2600
July	1st to 10th	Day	9% 7% 3 8% 7% 7% 7% 5% 7% 9% 29%	5900
	11th to 20th	Day	14% 8% 3 10% 8% 8% 8% 6% 7% 7% 20%	5900
	21st to end	Day	18% 10% 4 12% 8% 7% 7% 6% 7% 7% 15%	6424
August	1st to 10th	Day	14% 7% 3 9% 6% 7% 7% 6% 7% 9% 25%	4234
	11th to 20th	Day	13% 6% 3 7% 6% 7% 6% 5% 7% 9% 29%	4159
	21st to end	Day	11% 6% 2 8% 6% 6% 7% 5% 6% 8% 36%	4264
September	1st to 10th	Day	14% 9% 3 9% 6% 5% 5% 5% 5% 8% 32%	2200
	11th to 20th	Day	17% 9% 3 7% 4 4 5% 4 7% 7% 32%	2200
	21st to end	Day	15% 8% 3 7% 5% 5% 4 4 6% 7% 36%	2200
October	1st to 10th	Day	13% 7% 2 5% 4 4 5% 3 5% 6% 45%	2123
	11th to 20th	Day	12% 9% 3 6% 3 3 3 3 4 6% 49%	1914
	21st to end	Day	13% 8% 2 4 3 4 3 3 4 7% 48%	2090
November	1st to 10th	Day	11% 8% 2 5% 3 3 3 3 5% 5% 52%	1795
	11th to 20th	Day	10% 8% 3 8% 5% 4 4 4 6% 5% 44%	1800
	21st to end	Day	12% 9% 2 7% 4 4 5% 3 5% 6% 43%	1800
December	1st to 10th	Day	12% 10% 3 7% 4 4 4 3 4 5% 43%	2930
	11th to 20th	Day	13% 11% 5% 10% 6% 7% 5% 4 5% 4 32%	3373
	21st to end	Day	10% 9% 6% 10% 5% 5% 4 3 5% 7% 36%	4466
January	1st to 10th	Night	9% 15% 4 9% 7% 4 3 3 4 5% 36%	5889
	11th to 20th	Night	14% 12% 4 9% 4 3 4 4 4 5% 38%	5900
	21st to end	Night	12% 13% 4 8% 4 4 4 4 4 5% 38%	6490
February	1st to 10th	Night	13% 12% 4 8% 5% 5% 5% 4 5% 6% 33%	2445
	11th to 20th	Night	17% 13% 4 11% 5% 4 4 4 4 4 30%	2338
	21st to end	Night	16% 11% 4 9% 5% 4 5% 4 5% 6% 30%	1980
March	1st to 10th	Night	14% 15% 6% 9% 5% 4 4 4 5% 5% 30%	5146
	11th to 20th	Night	11% 9% 4 6% 3 3 4 3 5% 6% 45%	4980
	21st to end	Night	11% 8% 5% 8% 4 4 5% 4 5% 6% 39%	5467
April	1st to 10th	Night	12% 12% 4 6% 4 4 4 4 4 7% 39%	2200
	11th to 20th	Night	11% 12% 3 6% 4 4 4 3 5% 5% 42%	1936
	21st to end	Night	14% 9% 2 6% 5% 5% 4 4 5% 8% 38%	1800
May	1st to 10th	Night	15% 10% 3 8% 6% 5% 6% 5% 6% 7% 28%	4033
	11th to 20th	Night	19% 12% 4 10% 5% 5% 5% 3 6% 7% 24%	4032
	21st to end	Night	15% 11% 4 8% 4 5% 5% 4 7% 7% 30%	4421
June	1st to 10th	Night	10% 7% 3 7% 7% 6% 6% 5% 9% 11% 32%	1800
	11th to 20th	Night	8% 6% 2 6% 5% 5% 7% 6% 8% 11% 37%	1800
	21st to end	Night	10% 6% 3 7% 6% 5% 6% 5% 7% 10% 36%	1800
July	1st to 10th	Night	12% 9% 4 8% 5% 5% 5% 5% 6% 9% 33%	4058
	11th to 20th	Night	11% 8% 4 9% 6% 5% 6% 5% 8% 10% 30%	4057
	21st to end	Night	13% 11% 5% 10% 6% 6% 6% 5% 7% 10% 21%	4427
August	1st to 10th	Night	12% 7% 3 8% 5% 5% 6% 5% 7% 9% 33%	2915
	11th to 20th	Night	14% 8% 3 9% 6% 4 5% 4 6% 7% 33%	2875
	21st to end	Night	8% 6% 3 7% 5% 5% 5% 5% 6% 8% 43%	3583
September	1st to 10th	Night	13% 7% 3 7% 5% 5% 5% 5% 6% 7% 37%	2200
	11th to 20th	Night	13% 9% 2 8% 5% 4 4 3 5% 7% 39%	2200
	21st to end	Night	14% 8% 3 7% 4 4 5% 3 5% 5% 43%	2200
October	1st to 10th	Night	13% 8% 2 6% 4 3 3 3 5% 6% 48%	2124
	11th to 20th	Night	14% 8% 2 6% 4 4 4 3 4 5% 46%	2264
	21st to end	Night	11% 9% 2 6% 4 3 4 3 5% 5% 48%	2508
November	1st to 10th	Night	11% 9% 3 6% 4 4 4 3 5% 5% 46%	2498
	11th to 20th	Night	12% 10% 3 6% 4 3 4 4 5% 5% 44%	2600
	21st to end	Night	11% 10% 4 8% 4 4 4 4 5% 6% 41%	2600
December	1st to 10th	Night	11% 12% 5% 11% 5% 4 4 3 5% 4 36%	4250
	11th to 20th	Night	14% 13% 5% 15% 4 4 4 3 4 5% 31%	4822
	21st to end	Night	11% 12% 6% 11% 6% 4 4 4 5% 7% 31%	6490

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	38% 5% 6% 16% 28% 6%	4057
	11th to 20th	Day	40% 4 6% 11% 27% 12%	4060
	21st to end	Day	44% 4 7% 17% 19% 9%	4466
February	1st to 10th	Day	46% 5% 12% 17% 15% 4	1951
	11th to 20th	Day	50% 5% 8% 16% 16% 5%	1958
	21st to end	Day	50% 4 9% 12% 19% 7%	1650
March	1st to 10th	Day	45% 4 8% 13% 18% 11%	4705
	11th to 20th	Day	36% 4 7% 15% 21% 18%	4980
	21st to end	Day	43% 4 8% 27% 12% 5%	5465
April	1st to 10th	Day	42% 7% 11% 21% 16% 3	2205
	11th to 20th	Day	43% 6% 8% 19% 20% 4	2423
	21st to end	Day	45% 6% 12% 23% 13% 2	2600
May	1st to 10th	Day	51% 8% 13% 19% 9% 1	5897
	11th to 20th	Day	54% 10% 13% 17% 6%	5865
	21st to end	Day	45% 9% 12% 19% 13% 2	6447
June	1st to 10th	Day	49% 10% 15% 18% 7% 1	2600
	11th to 20th	Day	47% 10% 17% 16% 9% 1	2600
	21st to end	Day	44% 12% 17% 16% 10% 2	2600
July	1st to 10th	Day	41% 13% 18% 19% 8%	5835
	11th to 20th	Day	50% 16% 20% 11% 3 1	5831
	21st to end	Day	57% 13% 15% 10% 4	6240
August	1st to 10th	Day	46% 11% 16% 22% 5%	4221
	11th to 20th	Day	40% 12% 22% 14% 9% 3	4198
	21st to end	Day	44% 10% 14% 24% 7% 1	4264
September	1st to 10th	Day	48% 8% 11% 16% 15% 3	2200
	11th to 20th	Day	49% 7% 10% 18% 14% 1	2200
	21st to end	Day	44% 8% 12% 18% 14% 4	2200
October	1st to 10th	Day	26% 6% 8% 19% 28% 13%	3513
	11th to 20th	Day	23% 3 5% 18% 25% 25%	3154
	21st to end	Day	28% 4 8% 24% 19% 16%	3428
November	1st to 10th	Day	33% 4 8% 18% 27% 9%	1795
	11th to 20th	Day	35% 4 8% 21% 24% 9%	1800
	21st to end	Day	39% 5% 8% 20% 23% 5%	1800
December	1st to 10th	Day	39% 5% 7% 17% 24% 9%	2930
	11th to 20th	Day	48% 4 8% 16% 16% 7%	3370
	21st to end	Day	45% 5% 11% 23% 13% 2	4466
January	1st to 10th	Night	40% 4 8% 17% 22% 10%	5889
	11th to 20th	Night	42% 4 6% 13% 25% 10%	5900
	21st to end	Night	43% 4 8% 13% 21% 11%	6490
February	1st to 10th	Night	46% 6% 11% 17% 17% 3	2445
	11th to 20th	Night	53% 5% 8% 16% 14% 4	2339
	21st to end	Night	52% 6% 8% 14% 16% 5%	1980
March	1st to 10th	Night	46% 8% 10% 13% 17% 7%	5146
	11th to 20th	Night	34% 4 9% 20% 18% 15%	4980
	21st to end	Night	40% 6% 14% 22% 13% 5%	5467
April	1st to 10th	Night	41% 7% 13% 20% 16% 3	2200
	11th to 20th	Night	39% 5% 12% 21% 19% 4	1936
	21st to end	Night	40% 8% 14% 26% 11% 1	1800
May	1st to 10th	Night	50% 9% 14% 20% 6% 1	4060
	11th to 20th	Night	54% 9% 17% 15% 4	4033
	21st to end	Night	41% 10% 17% 21% 9% 1	4429
June	1st to 10th	Night	43% 12% 19% 19% 7% 1	1800
	11th to 20th	Night	34% 14% 23% 21% 7% 1	1800
	21st to end	Night	37% 14% 17% 20% 11% 2	1800
July	1st to 10th	Night	39% 12% 22% 21% 6%	4015
	11th to 20th	Night	39% 15% 29% 14% 2 1	4006
	21st to end	Night	49% 16% 21% 11% 4	4297
August	1st to 10th	Night	38% 13% 24% 21% 4	2904
	11th to 20th	Night	40% 11% 25% 15% 9%	2902
	21st to end	Night	33% 10% 22% 27% 8% 1	3583
September	1st to 10th	Night	42% 11% 14% 18% 11% 3	2200
	11th to 20th	Night	43% 10% 13% 20% 13%	2200
	21st to end	Night	41% 7% 12% 19% 17% 3	2200
October	1st to 10th	Night	26% 6% 11% 20% 25% 12%	3514
	11th to 20th	Night	24% 4 6% 20% 23% 24%	3763
	21st to end	Night	31% 3 7% 24% 20% 15%	4120
November	1st to 10th	Night	37% 4 10% 20% 22% 7%	2498
	11th to 20th	Night	38% 4 8% 19% 22% 9%	2600
	21st to end	Night	40% 4 8% 22% 21% 5%	2600
December	1st to 10th	Night	42% 5% 8% 15% 22% 8%	4250
	11th to 20th	Night	49% 5% 9% 15% 17% 5%	4824
	21st to end	Night	47% 6% 12% 19% 14% 2	6490

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% 26% 22% 13% 2	300
	11th to 20th	Day	42% 18% 23% 14% 2	300
	21st to end	Day	30% 28% 27% 12% 3	330
February	1st to 10th	Day	29% 20% 36% 12% 3	300
	11th to 20th	Day	49% 22% 22% 6% 1	300
	21st to end	Day	40% 24% 28% 7% 2	249
March	1st to 10th	Day	34% 14% 29% 17% 6%	395
	11th to 20th	Day	31% 19% 29% 16% 4 1	500
	21st to end	Day	29% 20% 24% 20% 6% 1	550
April	1st to 10th	Day	29% 16% 24% 22% 8% 1	500
	11th to 20th	Day	23% 19% 24% 21% 10% 3	492
	21st to end	Day	25% 10% 28% 21% 13% 3	500
May	1st to 10th	Day	23% 19% 25% 19% 9% 5%	503
	11th to 20th	Day	21% 11% 21% 26% 13% 8%	527
	21st to end	Day	22% 8% 18% 24% 16% 12%	573
June	1st to 10th	Day	18% 11% 19% 26% 17% 9%	530
	11th to 20th	Day	9% 8% 19% 29% 22% 14%	530
	21st to end	Day	11% 6% 22% 28% 19% 14%	530
July	1st to 10th	Day	12% 5% 14% 28% 26% 16%	525
	11th to 20th	Day	11% 7% 11% 29% 23% 18%	524
	21st to end	Day	11% 5% 12% 23% 31% 17%	576
August	1st to 10th	Day	20% 6% 16% 21% 21% 16%	526
	11th to 20th	Day	12% 6% 17% 28% 24% 13%	519
	21st to end	Day	14% 5% 10% 25% 28% 17%	583
September	1st to 10th	Day	12% 5% 14% 27% 29% 12%	530
	11th to 20th	Day	16% 4 15% 26% 26% 12%	530
	21st to end	Day	18% 9% 13% 30% 24% 6%	530
October	1st to 10th	Day	16% 8% 19% 29% 20% 8%	502
	11th to 20th	Day	15% 14% 23% 27% 19% 2	490
	21st to end	Day	20% 11% 23% 27% 16% 2	539
November	1st to 10th	Day	21% 12% 29% 24% 12% 3	333
	11th to 20th	Day	23% 17% 30% 24% 6%	300
	21st to end	Day	23% 19% 29% 20% 8% 1	300
December	1st to 10th	Day	34% 19% 29% 13% 5%	300
	11th to 20th	Day	29% 15% 30% 20% 6% 1	300
	21st to end	Day	35% 13% 31% 15% 6%	330
January	1st to 10th	Night	29% 14% 28% 24% 4	800
	11th to 20th	Night	31% 14% 29% 22% 5%	800
	21st to end	Night	25% 14% 34% 26% 2	880
February	1st to 10th	Night	22% 13% 33% 29% 3	800
	11th to 20th	Night	30% 14% 34% 22% 1	783
	21st to end	Night	31% 16% 32% 18% 3	660
March	1st to 10th	Night	26% 13% 30% 28% 5%	800
	11th to 20th	Night	25% 13% 27% 27% 8% 1	800
	21st to end	Night	24% 13% 26% 28% 8%	880
April	1st to 10th	Night	22% 16% 24% 28% 11% 1	800
	11th to 20th	Night	22% 9% 24% 29% 14% 2	603
	21st to end	Night	19% 8% 20% 38% 15% 1	600
May	1st to 10th	Night	18% 10% 19% 35% 17% 2	600
	11th to 20th	Night	20% 6% 16% 32% 22% 3	591
	21st to end	Night	15% 6% 8% 32% 34% 5%	650
June	1st to 10th	Night	14% 6% 10% 35% 31% 5%	600
	11th to 20th	Night	10% 2 10% 30% 39% 9%	600
	21st to end	Night	12% 4 6% 30% 42% 6%	600
July	1st to 10th	Night	11% 4 6% 25% 45% 8%	585
	11th to 20th	Night	11% 5% 4 22% 45% 14%	582
	21st to end	Night	10% 4 4 25% 48% 9%	657
August	1st to 10th	Night	14% 4 6% 24% 43% 9%	597
	11th to 20th	Night	17% 3 6% 29% 38% 8%	594
	21st to end	Night	15% 3 5% 23% 45% 11%	660
September	1st to 10th	Night	14% 4 8% 29% 38% 7%	800
	11th to 20th	Night	19% 4 8% 28% 35% 7%	800
	21st to end	Night	19% 6% 10% 31% 32% 2	800
October	1st to 10th	Night	17% 6% 15% 25% 31% 6%	773
	11th to 20th	Night	18% 9% 19% 32% 20% 2	760
	21st to end	Night	19% 9% 16% 38% 15% 3	836
November	1st to 10th	Night	18% 7% 19% 36% 18% 3	780
	11th to 20th	Night	19% 11% 22% 35% 12% 2	800
	21st to end	Night	23% 10% 21% 34% 12% 1	800
December	1st to 10th	Night	26% 14% 24% 29% 7%	800
	11th to 20th	Night	24% 11% 26% 32% 7% 1	800
	21st to end	Night	31% 9% 24% 31% 5%	880

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