Vineland
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Vineland clear sky chart from 2005-11-06 to 2024-08-15.

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% 10% 3 8% 5% 5% 5% 4 6% 7% 33%	95534
	Night	15% 11% 4 8% 5% 5% 5% 4 5% 7% 32%	93191
Transparency	Day	48% 9% 14% 19% 10% 1	95263
	Night	49% 9% 14% 17% 10% 1	93015
Seeing	Day	18% 11% 26% 25% 15% 5%	14171
	Night	20% 10% 28% 28% 13% 1	23592

By Month

Percentage Cloud Cover NE (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	15% 17% 6% 11% 6% 5% 5% 4 4 5% 22%	2517
	11th to 20th	Day	11% 20% 7% 16% 8% 5% 6% 4 5% 6% 13%	2805
	21st to end	Day	22% 17% 7% 13% 7% 7% 4 3 4 4 13%	3124
February	1st to 10th	Day	16% 17% 5% 13% 7% 5% 5% 5% 5% 5% 18%	1710
	11th to 20th	Day	11% 18% 5% 13% 7% 6% 4 4 6% 6% 19%	1663
	21st to end	Day	17% 13% 4 12% 7% 5% 5% 3 6% 6% 22%	1484
March	1st to 10th	Day	17% 11% 4 10% 6% 5% 5% 4 6% 5% 28%	3432
	11th to 20th	Day	10% 16% 4 10% 6% 6% 5% 4 5% 6% 30%	3480
	21st to end	Day	16% 9% 3 7% 5% 4 5% 4 5% 6% 35%	3815
April	1st to 10th	Day	17% 11% 3 8% 5% 5% 4 4 5% 6% 32%	2242
	11th to 20th	Day	17% 8% 3 7% 4 4 5% 3 5% 7% 35%	2306
	21st to end	Day	18% 9% 3 7% 5% 6% 4 4 5% 6% 34%	2470
May	1st to 10th	Day	15% 8% 3 8% 5% 5% 5% 3 5% 7% 34%	4108
	11th to 20th	Day	14% 10% 4 9% 6% 5% 4 4 5% 7% 32%	4333
	21st to end	Day	9% 6% 2 6% 4 4 5% 4 6% 8% 46%	4837
June	1st to 10th	Day	12% 6% 3 7% 5% 4 4 4 7% 8% 40%	2660
	11th to 20th	Day	10% 5% 3 6% 5% 5% 5% 4 8% 9% 40%	2660
	21st to end	Day	11% 5% 2 6% 4 4 5% 4 7% 10% 42%	2660
July	1st to 10th	Day	7% 4 2 6% 5% 5% 5% 5% 7% 11% 44%	4440
	11th to 20th	Day	9% 5% 2 4 4 5% 5% 5% 7% 10% 43%	4422
	21st to end	Day	7% 5% 2 6% 5% 5% 5% 5% 7% 9% 44%	4466
August	1st to 10th	Day	9% 5% 2 6% 3 4 5% 5% 8% 11% 41%	2457
	11th to 20th	Day	8% 5% 2 6% 5% 5% 6% 5% 8% 10% 39%	2357
	21st to end	Day	10% 5% 2 5% 4 4 4 3 6% 10% 45%	2466
September	1st to 10th	Day	12% 7% 2 5% 5% 4 5% 4 7% 9% 40%	2160
	11th to 20th	Day	9% 6% 2 5% 4 4 4 3 6% 7% 48%	2055
	21st to end	Day	13% 6% 2 7% 5% 4 6% 3 8% 8% 36%	1942
October	1st to 10th	Day	18% 9% 3 7% 4 4 5% 3 6% 6% 34%	1800
	11th to 20th	Day	18% 10% 4 9% 5% 5% 5% 3 6% 6% 30%	1800
	21st to end	Day	24% 12% 4 9% 5% 5% 4 4 4 6% 24%	1980
November	1st to 10th	Day	13% 9% 4 9% 5% 6% 4 4 5% 7% 34%	1645
	11th to 20th	Day	13% 12% 3 9% 6% 5% 6% 4 5% 7% 30%	1520
	21st to end	Day	19% 14% 3 9% 6% 4 4 4 6% 6% 24%	1520
December	1st to 10th	Day	17% 15% 5% 12% 7% 6% 4 4 6% 7% 19%	1520
	11th to 20th	Day	17% 16% 6% 10% 6% 6% 5% 5% 6% 6% 18%	1906
	21st to end	Day	26% 19% 6% 12% 6% 5% 4 3 3 4 11%	2772
January	1st to 10th	Night	16% 16% 5% 11% 6% 5% 4 4 5% 5% 22%	4429
	11th to 20th	Night	13% 16% 6% 15% 7% 6% 6% 4 5% 5% 18%	4152
	21st to end	Night	23% 17% 5% 11% 6% 5% 5% 3 4 5% 15%	4532
February	1st to 10th	Night	16% 16% 4 11% 6% 6% 4 4 5% 6% 21%	2470
	11th to 20th	Night	14% 14% 4 11% 6% 5% 5% 4 6% 7% 23%	2403
	21st to end	Night	17% 13% 5% 11% 7% 5% 5% 4 5% 7% 22%	1968
March	1st to 10th	Night	21% 10% 3 8% 6% 5% 4 3 5% 5% 31%	3408
	11th to 20th	Night	15% 13% 3 7% 4 4 4 4 4 7% 34%	3479
	21st to end	Night	15% 8% 2 7% 4 4 4 3 5% 6% 41%	3817
April	1st to 10th	Night	17% 11% 3 9% 5% 4 4 3 4 7% 32%	1938
	11th to 20th	Night	18% 8% 3 7% 5% 5% 4 4 5% 5% 37%	1839
	21st to end	Night	15% 9% 3 7% 4 5% 5% 4 6% 6% 35%	1710
May	1st to 10th	Night	18% 11% 4 8% 5% 3 3 3 5% 6% 34%	2833
	11th to 20th	Night	13% 8% 3 9% 6% 6% 6% 5% 7% 7% 31%	2559
	21st to end	Night	9% 5% 2 6% 4 3 4 3 7% 8% 48%	2738
June	1st to 10th	Night	11% 6% 3 7% 5% 6% 5% 5% 7% 9% 37%	1520
	11th to 20th	Night	8% 6% 2 6% 7% 5% 5% 4 6% 8% 43%	1520
	21st to end	Night	11% 7% 2 5% 4 4 6% 4 6% 9% 43%	1520
July	1st to 10th	Night	5% 5% 2 7% 5% 5% 4 4 6% 10% 47%	2520
	11th to 20th	Night	9% 5% 2 6% 4 4 4 4 6% 9% 48%	2534
	21st to end	Night	8% 5% 2 6% 4 4 5% 4 6% 9% 49%	3087
August	1st to 10th	Night	8% 5% 2 5% 4 5% 5% 4 7% 10% 45%	1701
	11th to 20th	Night	7% 4 2 6% 4 4 5% 5% 6% 9% 47%	1643
	21st to end	Night	8% 5% 2 6% 5% 4 5% 3 6% 9% 48%	1872
September	1st to 10th	Night	12% 6% 2 7% 4 4 5% 4 5% 6% 45%	1800
	11th to 20th	Night	11% 5% 2 5% 4 4 3 3 5% 7% 51%	1902
	21st to end	Night	15% 7% 3 8% 4 4 4 4 6% 6% 39%	2017
October	1st to 10th	Night	17% 7% 3 8% 4 4 3 3 5% 7% 38%	2160
	11th to 20th	Night	20% 10% 3 8% 5% 4 4 3 5% 7% 31%	2160
	21st to end	Night	24% 10% 2 8% 5% 4 4 4 5% 7% 26%	2376
November	1st to 10th	Night	16% 9% 3 6% 4 4 4 4 4 6% 39%	2432
	11th to 20th	Night	15% 11% 3 8% 6% 6% 5% 3 6% 7% 31%	2660
	21st to end	Night	18% 12% 4 8% 5% 5% 5% 4 6% 7% 25%	2660
December	1st to 10th	Night	18% 17% 5% 10% 6% 5% 5% 5% 5% 6% 19%	2660
	11th to 20th	Night	14% 18% 6% 10% 6% 5% 5% 4 5% 5% 21%	3288
	21st to end	Night	28% 17% 5% 11% 5% 5% 5% 3 4 5% 12%	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	61% 12% 13% 8% 5%	2518
	11th to 20th	Day	70% 11% 11% 6% 2	2805
	21st to end	Day	74% 10% 10% 5% 2	3124
February	1st to 10th	Day	68% 8% 10% 10% 3 1	1710
	11th to 20th	Day	62% 9% 11% 13% 4	1672
	21st to end	Day	61% 8% 13% 11% 6% 1	1484
March	1st to 10th	Day	53% 9% 15% 18% 5% 1	3435
	11th to 20th	Day	50% 10% 16% 16% 7% 1	3480
	21st to end	Day	46% 9% 12% 22% 10% 1	3815
April	1st to 10th	Day	53% 6% 13% 17% 11% 1	2242
	11th to 20th	Day	47% 8% 11% 19% 13% 2	2306
	21st to end	Day	49% 8% 12% 16% 12% 2	2470
May	1st to 10th	Day	47% 8% 14% 18% 11% 2	4120
	11th to 20th	Day	47% 12% 15% 17% 7% 1	4337
	21st to end	Day	32% 9% 14% 23% 17% 3	4837
June	1st to 10th	Day	40% 9% 14% 21% 14% 2	2660
	11th to 20th	Day	38% 9% 15% 24% 14% 1	2660
	21st to end	Day	36% 9% 15% 24% 14% 1	2660
July	1st to 10th	Day	33% 6% 14% 27% 18% 2	4370
	11th to 20th	Day	35% 6% 15% 31% 13% 1	4347
	21st to end	Day	35% 7% 17% 22% 17% 1	4324
August	1st to 10th	Day	34% 9% 19% 24% 12% 1	2444
	11th to 20th	Day	35% 11% 19% 24% 10% 1	2357
	21st to end	Day	35% 8% 14% 28% 13% 1	2466
September	1st to 10th	Day	39% 8% 17% 23% 11% 1	2160
	11th to 20th	Day	34% 7% 15% 28% 15% 1	2055
	21st to end	Day	42% 9% 18% 22% 9% 1	1942
October	1st to 10th	Day	48% 8% 15% 17% 12% 1	1800
	11th to 20th	Day	53% 8% 14% 17% 7% 1	1800
	21st to end	Day	62% 7% 13% 13% 5% 1	1980
November	1st to 10th	Day	48% 9% 14% 19% 8% 2	1645
	11th to 20th	Day	51% 9% 16% 14% 9% 1	1520
	21st to end	Day	58% 8% 16% 13% 4	1520
December	1st to 10th	Day	64% 8% 16% 10% 2	1520
	11th to 20th	Day	63% 12% 13% 9% 3	1906
	21st to end	Day	75% 9% 9% 6% 1	2772
January	1st to 10th	Night	60% 11% 16% 10% 3	4429
	11th to 20th	Night	63% 14% 15% 6% 2	4152
	21st to end	Night	70% 9% 10% 8% 2	4532
February	1st to 10th	Night	63% 7% 12% 13% 4	2470
	11th to 20th	Night	58% 8% 14% 14% 5%	2405
	21st to end	Night	58% 10% 12% 13% 7%	1968
March	1st to 10th	Night	53% 7% 13% 20% 6% 1	3418
	11th to 20th	Night	46% 10% 17% 16% 9% 1	3480
	21st to end	Night	40% 7% 12% 24% 15% 2	3817
April	1st to 10th	Night	53% 7% 10% 19% 11% 1	1938
	11th to 20th	Night	48% 7% 9% 19% 14% 2	1839
	21st to end	Night	46% 8% 12% 17% 14% 3	1710
May	1st to 10th	Night	48% 9% 11% 17% 13% 3	2840
	11th to 20th	Night	42% 14% 16% 18% 8% 2	2560
	21st to end	Night	31% 10% 13% 24% 21% 2	2739
June	1st to 10th	Night	39% 12% 11% 20% 16% 1	1520
	11th to 20th	Night	37% 6% 14% 23% 17% 2	1520
	21st to end	Night	38% 8% 13% 23% 16% 2	1520
July	1st to 10th	Night	35% 5% 12% 23% 22% 3	2480
	11th to 20th	Night	33% 5% 14% 32% 15% 1	2486
	21st to end	Night	32% 6% 18% 23% 18% 2	2988
August	1st to 10th	Night	31% 10% 16% 27% 14% 2	1690
	11th to 20th	Night	31% 10% 17% 30% 12% 1	1643
	21st to end	Night	32% 9% 15% 28% 15% 2	1872
September	1st to 10th	Night	38% 7% 16% 23% 14% 2	1800
	11th to 20th	Night	30% 7% 13% 31% 18% 1	1902
	21st to end	Night	43% 8% 13% 22% 13% 1	2017
October	1st to 10th	Night	44% 8% 13% 21% 14% 1	2160
	11th to 20th	Night	51% 7% 15% 18% 8%	2160
	21st to end	Night	55% 8% 13% 14% 9% 1	2376
November	1st to 10th	Night	44% 8% 15% 22% 11% 1	2432
	11th to 20th	Night	50% 8% 15% 17% 9% 1	2660
	21st to end	Night	55% 10% 17% 14% 3	2660
December	1st to 10th	Night	62% 11% 13% 10% 3	2660
	11th to 20th	Night	62% 10% 13% 11% 4	3288
	21st to end	Night	71% 10% 12% 6% 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	22% 18% 35% 17% 8% 1	180
	11th to 20th	Day	25% 22% 32% 13% 6% 1	260
	21st to end	Day	21% 20% 31% 22% 5% 1	297
February	1st to 10th	Day	21% 19% 41% 14% 3	270
	11th to 20th	Day	24% 20% 37% 16% 2	270
	21st to end	Day	27% 24% 32% 16% 1	253
March	1st to 10th	Day	21% 12% 37% 22% 7% 1	460
	11th to 20th	Day	21% 17% 34% 21% 6% 1	460
	21st to end	Day	26% 12% 29% 23% 8% 1	506
April	1st to 10th	Day	21% 15% 29% 26% 8% 1	460
	11th to 20th	Day	25% 17% 23% 21% 11% 4	452
	21st to end	Day	23% 10% 30% 25% 9% 2	460
May	1st to 10th	Day	22% 9% 25% 27% 13% 4	463
	11th to 20th	Day	18% 7% 22% 28% 22% 4	487
	21st to end	Day	12% 7% 21% 31% 21% 8%	529
June	1st to 10th	Day	15% 7% 27% 33% 15% 3	490
	11th to 20th	Day	12% 6% 26% 31% 22% 3	490
	21st to end	Day	16% 6% 26% 31% 18% 4	490
July	1st to 10th	Day	9% 3 16% 33% 28% 10%	485
	11th to 20th	Day	15% 5% 20% 27% 23% 10%	484
	21st to end	Day	8% 5% 23% 34% 22% 9%	532
August	1st to 10th	Day	12% 2 20% 29% 25% 12%	486
	11th to 20th	Day	10% 5% 20% 27% 25% 13%	456
	21st to end	Day	14% 4 19% 30% 22% 13%	495
September	1st to 10th	Day	14% 5% 21% 26% 22% 10%	450
	11th to 20th	Day	9% 6% 16% 25% 28% 16%	450
	21st to end	Day	15% 10% 25% 25% 17% 9%	450
October	1st to 10th	Day	22% 10% 23% 20% 18% 7%	450
	11th to 20th	Day	21% 16% 31% 20% 9% 2	450
	21st to end	Day	33% 14% 24% 20% 9%	495
November	1st to 10th	Day	18% 19% 30% 21% 9% 3	293
	11th to 20th	Day	23% 19% 29% 20% 7% 2	180
	21st to end	Day	29% 18% 32% 17% 4	180
December	1st to 10th	Day	25% 19% 34% 16% 4 1	180
	11th to 20th	Day	27% 24% 32% 14% 3	180
	21st to end	Day	25% 20% 37% 16% 3	198
January	1st to 10th	Night	26% 18% 33% 16% 7%	760
	11th to 20th	Night	27% 18% 32% 19% 4	760
	21st to end	Night	20% 13% 36% 24% 6%	836
February	1st to 10th	Night	25% 18% 34% 21% 3	760
	11th to 20th	Night	20% 16% 34% 25% 4	743
	21st to end	Night	22% 15% 36% 24% 3	628
March	1st to 10th	Night	20% 12% 34% 26% 7%	760
	11th to 20th	Night	24% 14% 31% 23% 8%	760
	21st to end	Night	19% 8% 33% 28% 10% 1	836
April	1st to 10th	Night	23% 11% 31% 30% 5% 1	760
	11th to 20th	Night	20% 10% 32% 26% 10% 1	715
	21st to end	Night	19% 7% 28% 35% 11%	570
May	1st to 10th	Night	18% 6% 24% 32% 18% 2	570
	11th to 20th	Night	14% 4 26% 40% 16%	412
	21st to end	Night	13% 4 23% 33% 23% 3	411
June	1st to 10th	Night	13% 3 31% 35% 18% 1	380
	11th to 20th	Night	13% 3 26% 37% 21% 1	380
	21st to end	Night	11% 6% 21% 46% 16% 1	380
July	1st to 10th	Night	6% 3 20% 45% 24% 2	370
	11th to 20th	Night	10% 2 23% 39% 22% 3	369
	21st to end	Night	11% 3 17% 43% 24% 2	624
August	1st to 10th	Night	9% 4 13% 38% 32% 4	567
	11th to 20th	Night	9% 1 17% 32% 37% 3	549
	21st to end	Night	11% 1 19% 38% 28% 3	684
September	1st to 10th	Night	14% 4 18% 34% 24% 5%	720
	11th to 20th	Night	13% 5% 16% 31% 29% 6%	720
	21st to end	Night	16% 7% 20% 31% 21% 5%	720
October	1st to 10th	Night	19% 7% 24% 28% 20% 3	720
	11th to 20th	Night	23% 13% 29% 25% 9% 1	720
	21st to end	Night	29% 11% 28% 25% 6%	792
November	1st to 10th	Night	21% 10% 29% 26% 11% 1	740
	11th to 20th	Night	20% 15% 35% 21% 8% 2	760
	21st to end	Night	24% 14% 35% 21% 6% 1	760
December	1st to 10th	Night	29% 18% 30% 18% 5%	760
	11th to 20th	Night	23% 19% 34% 19% 5%	760
	21st to end	Night	29% 15% 33% 21% 2	836

Page generated at 2024-08-12 09:52:47. Version ac07

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