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 2024-11-05.

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	14% 9% 3 8% 6% 5% 5% 4 6% 7% 33%	101039
	Night	13% 10% 4 8% 5% 4 5% 4 5% 7% 35%	97930
Transparency	Day	45% 8% 11% 18% 14% 5%	104820
	Night	42% 8% 13% 19% 14% 5%	102288
Seeing	Day	21% 11% 21% 23% 16% 8%	14935
	Night	20% 8% 18% 29% 20% 3	24965

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% 10% 4 8% 7% 7% 4 5% 6% 6% 32%	2836
	11th to 20th	Day	11% 12% 6% 12% 5% 4 4 3 5% 4 34%	2840
	21st to end	Day	13% 15% 5% 10% 4 5% 3 3 4 5% 34%	3124
February	1st to 10th	Day	15% 10% 4 11% 6% 5% 4 4 4 5% 32%	1853
	11th to 20th	Day	17% 12% 4 9% 5% 4 4 3 4 5% 31%	1848
	21st to end	Day	16% 12% 3 10% 5% 3 4 4 5% 4 33%	1570
March	1st to 10th	Day	19% 10% 4 7% 4 4 4 3 4 6% 34%	3275
	11th to 20th	Day	14% 9% 3 7% 4 3 3 3 4 4 46%	3480
	21st to end	Day	15% 12% 3 8% 5% 4 4 4 5% 5% 36%	3815
April	1st to 10th	Day	12% 11% 3 7% 5% 5% 5% 4 6% 6% 37%	2095
	11th to 20th	Day	14% 10% 3 7% 5% 4 4 4 5% 7% 38%	2300
	21st to end	Day	16% 10% 3 7% 5% 5% 4 3 5% 6% 37%	2470
May	1st to 10th	Day	17% 9% 3 9% 6% 5% 6% 4 5% 6% 30%	4082
	11th to 20th	Day	18% 10% 4 10% 6% 5% 5% 4 5% 6% 26%	4081
	21st to end	Day	12% 7% 3 8% 6% 5% 6% 6% 7% 9% 32%	4476
June	1st to 10th	Day	13% 8% 3 9% 6% 7% 8% 5% 7% 8% 26%	2470
	11th to 20th	Day	8% 8% 3 9% 7% 7% 7% 6% 7% 9% 28%	2470
	21st to end	Day	12% 8% 3 8% 7% 7% 6% 5% 7% 9% 29%	2470
July	1st to 10th	Day	10% 8% 3 8% 7% 8% 7% 5% 8% 10% 25%	4120
	11th to 20th	Day	15% 8% 3 9% 7% 7% 7% 6% 7% 7% 26%	4120
	21st to end	Day	20% 11% 4 13% 9% 7% 6% 5% 6% 5% 13%	4466
August	1st to 10th	Day	13% 7% 3 9% 6% 7% 7% 6% 7% 9% 25%	4104
	11th to 20th	Day	13% 6% 3 7% 6% 7% 6% 5% 7% 9% 29%	4029
	21st to end	Day	10% 6% 2 8% 6% 6% 7% 5% 6% 8% 35%	4133
September	1st to 10th	Day	14% 9% 3 9% 6% 5% 5% 4 5% 8% 32%	2090
	11th to 20th	Day	18% 9% 3 7% 4 4 5% 4 7% 7% 31%	2090
	21st to end	Day	15% 8% 3 7% 5% 5% 4 4 6% 6% 37%	2090
October	1st to 10th	Day	13% 8% 2 5% 4 4 5% 3 4 6% 45%	2090
	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% 1 5% 3 2 3 3 5% 5% 52%	1741
	11th to 20th	Day	10% 8% 3 8% 5% 4 4 4 5% 5% 45%	1710
	21st to end	Day	12% 9% 2 7% 4 4 5% 3 5% 6% 42%	1710
December	1st to 10th	Day	17% 11% 3 9% 5% 5% 5% 4 5% 5% 31%	1710
	11th to 20th	Day	11% 11% 4 7% 5% 6% 5% 4 5% 5% 37%	2153
	21st to end	Day	12% 9% 6% 9% 5% 5% 5% 3 5% 6% 35%	3124
January	1st to 10th	Night	12% 15% 4 10% 7% 6% 4 3 4 5% 30%	4109
	11th to 20th	Night	16% 12% 4 8% 4 3 5% 5% 4 5% 33%	4120
	21st to end	Night	15% 16% 5% 9% 4 3 4 4 3 4 31%	4532
February	1st to 10th	Night	12% 12% 4 9% 6% 5% 5% 4 5% 5% 33%	2323
	11th to 20th	Night	17% 13% 4 10% 5% 4 4 4 4 3 31%	2218
	21st to end	Night	17% 11% 4 10% 6% 5% 5% 4 5% 6% 28%	1884
March	1st to 10th	Night	17% 15% 5% 9% 5% 5% 5% 5% 5% 5% 25%	3576
	11th to 20th	Night	13% 8% 4 8% 4 4 4 3 5% 6% 41%	3480
	21st to end	Night	14% 9% 4 8% 5% 4 4 4 5% 6% 37%	3817
April	1st to 10th	Night	12% 12% 3 6% 4 4 4 4 4 7% 40%	2090
	11th to 20th	Night	11% 12% 3 6% 4 4 4 3 5% 5% 41%	1839
	21st to end	Night	14% 9% 2 5% 4 5% 4 4 5% 8% 39%	1710
May	1st to 10th	Night	16% 10% 2 8% 6% 5% 6% 5% 6% 6% 30%	2813
	11th to 20th	Night	18% 10% 3 9% 5% 5% 4 3 5% 7% 31%	2812
	21st to end	Night	11% 6% 3 8% 5% 5% 6% 5% 8% 9% 34%	3079
June	1st to 10th	Night	9% 7% 3 7% 7% 6% 6% 5% 9% 11% 31%	1710
	11th to 20th	Night	7% 5% 2 6% 5% 5% 8% 6% 8% 12% 37%	1710
	21st to end	Night	10% 6% 3 7% 6% 5% 6% 5% 6% 9% 35%	1710
July	1st to 10th	Night	12% 9% 4 8% 5% 6% 5% 6% 7% 9% 30%	2840
	11th to 20th	Night	10% 7% 3 7% 5% 5% 5% 5% 8% 10% 36%	2840
	21st to end	Night	15% 11% 5% 11% 6% 6% 6% 5% 7% 9% 19%	3087
August	1st to 10th	Night	11% 7% 3 7% 5% 5% 6% 5% 7% 9% 34%	2825
	11th to 20th	Night	14% 9% 3 9% 6% 4 5% 4 6% 7% 33%	2785
	21st to end	Night	8% 6% 3 7% 4 4 5% 5% 6% 8% 44%	3473
September	1st to 10th	Night	13% 7% 3 6% 6% 5% 5% 5% 6% 7% 37%	2090
	11th to 20th	Night	14% 9% 2 8% 5% 4 4 3 5% 7% 38%	2090
	21st to end	Night	14% 8% 3 7% 4 4 5% 3 5% 5% 43%	2090
October	1st to 10th	Night	13% 8% 2 6% 4 3 3 3 5% 6% 48%	2090
	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	12% 9% 3 6% 4 3 4 3 5% 5% 46%	2432
	11th to 20th	Night	12% 10% 3 6% 4 3 4 3 5% 5% 44%	2470
	21st to end	Night	12% 10% 3 8% 4 4 4 4 5% 6% 41%	2470
December	1st to 10th	Night	15% 14% 4 11% 6% 5% 5% 3 5% 5% 28%	2470
	11th to 20th	Night	13% 14% 4 10% 5% 5% 4 3 4 5% 35%	3042
	21st to end	Night	13% 11% 7% 11% 7% 5% 5% 4 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	44% 6% 11% 23% 13% 2	2470
May	1st to 10th	Day	50% 7% 12% 20% 10% 1	4120
	11th to 20th	Day	53% 9% 11% 20% 7% 1	4085
	21st to end	Day	42% 10% 14% 19% 14% 1	4489
June	1st to 10th	Day	50% 10% 15% 17% 7% 1	2470
	11th to 20th	Day	47% 10% 17% 16% 10% 1	2470
	21st to end	Day	45% 11% 16% 15% 10% 3	2470
July	1st to 10th	Day	45% 14% 17% 18% 6%	4055
	11th to 20th	Day	51% 13% 17% 14% 5% 1	4051
	21st to end	Day	66% 11% 11% 8% 3	4324
August	1st to 10th	Day	46% 11% 16% 22% 5%	4091
	11th to 20th	Day	40% 11% 22% 14% 9% 4	4068
	21st to end	Day	44% 10% 14% 24% 6% 1	4133
September	1st to 10th	Day	48% 8% 11% 16% 14% 3	2090
	11th to 20th	Day	50% 7% 9% 18% 14% 1	2090
	21st to end	Day	44% 8% 12% 18% 14% 4	2090
October	1st to 10th	Day	26% 6% 8% 19% 28% 13%	3480
	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%	1741
	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% 8% 13% 27% 12% 1	1710
May	1st to 10th	Night	49% 9% 15% 20% 6% 1	2840
	11th to 20th	Night	49% 10% 16% 19% 6%	2813
	21st to end	Night	37% 12% 19% 22% 8%	3087
June	1st to 10th	Night	44% 12% 18% 18% 7% 1	1710
	11th to 20th	Night	32% 14% 24% 21% 7% 1	1710
	21st to end	Night	37% 14% 16% 20% 11% 2	1710
July	1st to 10th	Night	43% 14% 21% 17% 5%	2795
	11th to 20th	Night	35% 15% 27% 18% 3 1	2786
	21st to end	Night	55% 15% 16% 11% 3	2988
August	1st to 10th	Night	38% 12% 24% 21% 4	2814
	11th to 20th	Night	39% 11% 25% 15% 10%	2812
	21st to end	Night	32% 10% 22% 27% 8% 1	3473
September	1st to 10th	Night	42% 11% 14% 19% 12% 3	2090
	11th to 20th	Night	44% 9% 12% 20% 14%	2090
	21st to end	Night	41% 7% 12% 20% 18% 3	2090
October	1st to 10th	Night	26% 6% 11% 19% 25% 12%	3480
	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	36% 4 10% 20% 22% 7%	2432
	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% 28% 20% 14% 4	460
May	1st to 10th	Day	21% 17% 26% 20% 10% 6%	463
	11th to 20th	Day	20% 8% 22% 28% 14% 8%	487
	21st to end	Day	19% 7% 19% 26% 17% 13%	529
June	1st to 10th	Day	19% 9% 18% 26% 19% 10%	490
	11th to 20th	Day	9% 6% 18% 30% 23% 15%	490
	21st to end	Day	11% 7% 24% 26% 18% 14%	490
July	1st to 10th	Day	13% 4 12% 27% 27% 16%	485
	11th to 20th	Day	12% 7% 12% 29% 23% 19%	484
	21st to end	Day	12% 5% 12% 23% 30% 18%	532
August	1st to 10th	Day	19% 6% 16% 21% 21% 17%	486
	11th to 20th	Day	13% 6% 16% 28% 24% 13%	479
	21st to end	Day	15% 4 9% 25% 28% 19%	539
September	1st to 10th	Day	12% 4 13% 27% 30% 13%	490
	11th to 20th	Day	17% 4 14% 25% 27% 13%	490
	21st to end	Day	19% 7% 12% 30% 25% 6%	490
October	1st to 10th	Day	16% 8% 19% 29% 20% 8%	490
	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% 11% 29% 24% 13% 3	315
	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	18% 7% 20% 39% 16% 1	570
May	1st to 10th	Night	18% 10% 18% 35% 18% 2	570
	11th to 20th	Night	18% 6% 15% 33% 24% 4	561
	21st to end	Night	13% 5% 8% 33% 36% 6%	617
June	1st to 10th	Night	14% 5% 9% 35% 32% 5%	570
	11th to 20th	Night	8% 2 9% 31% 40% 9%	570
	21st to end	Night	12% 4 6% 31% 41% 6%	570
July	1st to 10th	Night	12% 4 5% 25% 46% 8%	555
	11th to 20th	Night	11% 4 3 23% 45% 14%	552
	21st to end	Night	10% 4 4 25% 48% 10%	624
August	1st to 10th	Night	13% 4 5% 24% 44% 10%	567
	11th to 20th	Night	16% 3 5% 30% 37% 8%	564
	21st to end	Night	15% 3 3 23% 46% 11%	627
September	1st to 10th	Night	14% 4 7% 28% 40% 8%	760
	11th to 20th	Night	19% 4 8% 28% 34% 7%	760
	21st to end	Night	19% 6% 10% 30% 33% 2	760
October	1st to 10th	Night	17% 6% 15% 26% 30% 6%	760
	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% 6% 18% 36% 18% 3	760
	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 2024-11-03 02:11:07. Version ac07

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