Bangs Falls
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bangs Falls clear sky chart from 2005-11-06 to 2024-03-01.

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	21% 10% 4 7% 6% 3 4 4 5% 6% 30%	78916
	Night	21% 10% 4 7% 6% 3 4 4 5% 6% 30%	80506
Transparency	Day	54% 4 11% 20% 11% 1	78625
	Night	54% 3 12% 20% 10% 1	80332
Seeing	Day	30% 18% 30% 16% 5% 1	16207
	Night	27% 15% 32% 20% 5%	23871

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	18% 11% 6% 10% 8% 5% 5% 5% 4 6% 23%	2526
	11th to 20th	Day	19% 12% 6% 15% 8% 5% 5% 5% 5% 5% 17%	2751
	21st to end	Day	20% 10% 6% 10% 6% 4 5% 4 5% 5% 24%	3124
February	1st to 10th	Day	21% 13% 6% 9% 8% 3 4 5% 4 6% 21%	1710
	11th to 20th	Day	18% 13% 5% 12% 7% 4 5% 5% 4 5% 22%	1663
	21st to end	Day	13% 15% 4 9% 7% 4 4 4 5% 6% 29%	1461
March	1st to 10th	Day	18% 15% 5% 8% 8% 4 4 3 3 5% 26%	1971
	11th to 20th	Day	18% 10% 5% 7% 7% 3 5% 4 4 6% 31%	1980
	21st to end	Day	18% 15% 5% 7% 5% 3 4 4 4 5% 31%	2178
April	1st to 10th	Day	27% 14% 4 6% 4 3 4 3 4 5% 25%	2114
	11th to 20th	Day	23% 9% 3 5% 4 2 4 4 5% 6% 35%	2233
	21st to end	Day	26% 10% 3 5% 4 2 4 3 4 6% 33%	2340
May	1st to 10th	Day	26% 10% 3 6% 6% 3 4 4 5% 6% 26%	2340
	11th to 20th	Day	23% 8% 3 5% 5% 2 4 4 5% 7% 35%	2459
	21st to end	Day	23% 9% 3 5% 4 2 4 4 5% 7% 33%	2724
June	1st to 10th	Day	27% 9% 3 6% 5% 3 4 4 4 7% 29%	2520
	11th to 20th	Day	23% 7% 3 6% 5% 3 4 4 5% 5% 35%	2653
	21st to end	Day	24% 9% 3 6% 6% 4 4 5% 5% 8% 27%	2700
July	1st to 10th	Day	20% 7% 3 5% 4 3 4 5% 5% 8% 35%	2678
	11th to 20th	Day	18% 8% 3 5% 6% 3 5% 5% 5% 9% 33%	2520
	21st to end	Day	20% 9% 3 7% 5% 4 4 5% 6% 7% 30%	2576
August	1st to 10th	Day	17% 6% 2 5% 5% 3 5% 6% 6% 8% 37%	2327
	11th to 20th	Day	17% 7% 3 6% 6% 3 6% 5% 6% 8% 35%	2304
	21st to end	Day	16% 7% 2 5% 4 3 4 4 5% 7% 42%	2502
September	1st to 10th	Day	17% 6% 2 5% 4 2 4 5% 5% 7% 42%	2160
	11th to 20th	Day	19% 7% 3 5% 4 3 3 3 4 6% 43%	2035
	21st to end	Day	20% 8% 2 5% 4 3 3 3 4 5% 43%	1958
October	1st to 10th	Day	20% 7% 3 5% 5% 2 3 4 5% 8% 38%	1800
	11th to 20th	Day	20% 8% 3 6% 5% 3 5% 5% 5% 7% 33%	1800
	21st to end	Day	23% 10% 4 7% 5% 3 4 4 4 6% 30%	1980
November	1st to 10th	Day	21% 11% 4 7% 5% 3 4 3 4 6% 33%	1580
	11th to 20th	Day	23% 10% 5% 7% 6% 4 5% 4 4 7% 27%	1520
	21st to end	Day	21% 11% 5% 8% 7% 4 5% 4 4 5% 26%	1520
December	1st to 10th	Day	26% 14% 5% 8% 7% 3 4 4 5% 5% 21%	1520
	11th to 20th	Day	30% 12% 4 7% 7% 3 5% 5% 4 6% 17%	1906
	21st to end	Day	23% 12% 7% 8% 6% 3 4 3 5% 6% 22%	2783
January	1st to 10th	Night	16% 11% 4 14% 8% 4 5% 5% 5% 6% 21%	4429
	11th to 20th	Night	19% 14% 6% 15% 8% 3 5% 4 4 5% 17%	4207
	21st to end	Night	19% 12% 4 11% 8% 4 5% 5% 5% 6% 21%	4532
February	1st to 10th	Night	21% 12% 4 8% 8% 4 6% 5% 5% 6% 22%	2470
	11th to 20th	Night	18% 12% 4 9% 8% 4 6% 5% 6% 5% 22%	2403
	21st to end	Night	14% 12% 5% 8% 7% 4 6% 5% 5% 6% 28%	1989
March	1st to 10th	Night	19% 11% 4 7% 6% 4 5% 4 5% 6% 30%	1983
	11th to 20th	Night	20% 9% 4 6% 7% 4 5% 5% 4 6% 29%	1979
	21st to end	Night	18% 11% 3 7% 5% 4 3 4 4 6% 34%	2178
April	1st to 10th	Night	26% 12% 3 6% 5% 3 4 4 4 5% 28%	1846
	11th to 20th	Night	26% 9% 3 5% 4 2 4 4 4 6% 33%	1674
	21st to end	Night	26% 9% 4 6% 4 3 4 3 4 6% 32%	1620
May	1st to 10th	Night	23% 11% 4 6% 6% 3 3 3 5% 6% 30%	1620
	11th to 20th	Night	23% 8% 3 6% 5% 3 3 5% 5% 7% 32%	1434
	21st to end	Night	21% 7% 4 7% 5% 2 3 4 5% 7% 34%	1550
June	1st to 10th	Night	28% 7% 3 6% 4 2 4 4 5% 6% 31%	1440
	11th to 20th	Night	22% 8% 3 6% 5% 3 3 4 4 6% 35%	1318
	21st to end	Night	26% 8% 2 6% 5% 3 4 4 5% 6% 29%	1260
July	1st to 10th	Night	19% 6% 2 6% 5% 2 5% 4 6% 8% 37%	1260
	11th to 20th	Night	16% 7% 3 6% 6% 4 5% 5% 6% 9% 32%	1440
	21st to end	Night	20% 7% 3 6% 5% 2 4 5% 5% 6% 36%	1740
August	1st to 10th	Night	15% 7% 3 5% 5% 2 3 4 5% 7% 43%	1612
	11th to 20th	Night	18% 7% 3 7% 5% 3 4 4 5% 6% 38%	1596
	21st to end	Night	16% 6% 2 5% 5% 3 4 4 5% 7% 43%	1854
September	1st to 10th	Night	16% 6% 3 5% 4 3 3 4 5% 7% 45%	1800
	11th to 20th	Night	20% 7% 2 4 3 1 3 4 5% 6% 45%	1921
	21st to end	Night	20% 8% 3 5% 5% 3 3 4 3 6% 39%	2002
October	1st to 10th	Night	20% 6% 2 5% 5% 2 4 4 5% 6% 40%	2160
	11th to 20th	Night	20% 8% 3 4 5% 3 4 4 5% 7% 39%	2160
	21st to end	Night	25% 7% 3 5% 5% 3 5% 5% 4 6% 33%	2376
November	1st to 10th	Night	21% 7% 3 5% 6% 3 4 4 5% 7% 35%	2496
	11th to 20th	Night	20% 10% 3 7% 6% 4 5% 5% 6% 7% 28%	2660
	21st to end	Night	20% 11% 4 7% 6% 3 4 5% 5% 7% 28%	2660
December	1st to 10th	Night	24% 13% 4 8% 6% 4 4 4 5% 7% 22%	2660
	11th to 20th	Night	30% 10% 4 6% 6% 3 4 4 5% 6% 20%	3293
	21st to end	Night	25% 10% 5% 9% 5% 3 4 4 4 6% 25%	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	60% 2 17% 16% 5%	2527
	11th to 20th	Day	67% 3 13% 14% 4	2751
	21st to end	Day	59% 3 12% 17% 9%	3124
February	1st to 10th	Day	63% 3 12% 14% 7% 1	1710
	11th to 20th	Day	62% 4 10% 17% 7%	1671
	21st to end	Day	55% 3 12% 19% 9% 3	1461
March	1st to 10th	Day	61% 3 7% 17% 11% 1	1975
	11th to 20th	Day	54% 3 10% 18% 13% 2	1980
	21st to end	Day	56% 3 7% 18% 13% 2	2178
April	1st to 10th	Day	62% 3 7% 14% 13% 2	2114
	11th to 20th	Day	50% 4 9% 22% 13% 1	2233
	21st to end	Day	55% 3 9% 18% 12% 3	2340
May	1st to 10th	Day	59% 4 9% 17% 10% 1	2340
	11th to 20th	Day	49% 4 9% 21% 15% 2	2463
	21st to end	Day	51% 4 12% 21% 10% 1	2724
June	1st to 10th	Day	56% 4 9% 20% 11%	2520
	11th to 20th	Day	51% 4 10% 20% 14% 2	2653
	21st to end	Day	56% 6% 11% 16% 10% 1	2700
July	1st to 10th	Day	45% 5% 16% 20% 12% 3	2604
	11th to 20th	Day	48% 4 13% 24% 9% 1	2444
	21st to end	Day	51% 4 15% 22% 7% 1	2432
August	1st to 10th	Day	43% 6% 14% 22% 13% 1	2314
	11th to 20th	Day	46% 4 16% 23% 11%	2304
	21st to end	Day	41% 4 11% 27% 15% 1	2502
September	1st to 10th	Day	40% 4 12% 24% 17% 2	2160
	11th to 20th	Day	44% 3 9% 25% 18% 2	2035
	21st to end	Day	44% 4 7% 26% 18% 1	1958
October	1st to 10th	Day	46% 4 10% 27% 12% 2	1800
	11th to 20th	Day	48% 4 13% 22% 12% 1	1800
	21st to end	Day	54% 3 10% 21% 10% 1	1980
November	1st to 10th	Day	53% 3 11% 22% 10% 1	1580
	11th to 20th	Day	56% 4 13% 19% 8% 1	1520
	21st to end	Day	59% 4 13% 18% 6%	1520
December	1st to 10th	Day	65% 3 10% 17% 5%	1520
	11th to 20th	Day	68% 3 9% 14% 6%	1905
	21st to end	Day	61% 2 17% 14% 6% 1	2783
January	1st to 10th	Night	63% 2 12% 18% 4	4429
	11th to 20th	Night	68% 3 11% 12% 5%	4207
	21st to end	Night	62% 3 12% 16% 7%	4532
February	1st to 10th	Night	60% 4 11% 16% 8% 1	2470
	11th to 20th	Night	60% 3 11% 17% 8% 1	2406
	21st to end	Night	53% 4 13% 19% 10% 1	1989
March	1st to 10th	Night	54% 4 10% 20% 10% 2	1992
	11th to 20th	Night	55% 3 11% 16% 13% 2	1980
	21st to end	Night	51% 3 10% 21% 13% 2	2178
April	1st to 10th	Night	57% 3 9% 14% 13% 3	1846
	11th to 20th	Night	52% 2 9% 21% 13% 2	1674
	21st to end	Night	56% 2 9% 21% 12% 2	1620
May	1st to 10th	Night	56% 2 10% 21% 10% 1	1620
	11th to 20th	Night	51% 3 8% 24% 12% 1	1435
	21st to end	Night	51% 5% 13% 21% 9% 1	1551
June	1st to 10th	Night	54% 4 11% 23% 9%	1440
	11th to 20th	Night	52% 3 12% 19% 12% 1	1318
	21st to end	Night	57% 5% 11% 14% 11% 1	1260
July	1st to 10th	Night	44% 5% 15% 24% 11%	1225
	11th to 20th	Night	49% 6% 12% 22% 10%	1392
	21st to end	Night	48% 4 14% 25% 8% 2	1644
August	1st to 10th	Night	41% 4 14% 27% 14%	1600
	11th to 20th	Night	47% 5% 14% 23% 11%	1596
	21st to end	Night	42% 5% 13% 26% 15% 1	1854
September	1st to 10th	Night	40% 4 10% 29% 15% 2	1800
	11th to 20th	Night	41% 2 7% 29% 17% 2	1921
	21st to end	Night	47% 3 7% 26% 15% 2	2002
October	1st to 10th	Night	44% 3 12% 24% 14% 2	2160
	11th to 20th	Night	45% 3 13% 28% 11%	2160
	21st to end	Night	50% 4 11% 21% 13% 1	2376
November	1st to 10th	Night	49% 4 14% 22% 11% 1	2496
	11th to 20th	Night	54% 3 12% 21% 10%	2660
	21st to end	Night	54% 5% 15% 18% 7% 1	2660
December	1st to 10th	Night	61% 3 12% 19% 4	2660
	11th to 20th	Night	62% 4 10% 18% 7%	3295
	21st to end	Night	60% 2 14% 18% 6%	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	32% 22% 30% 13% 2	370
	11th to 20th	Day	35% 22% 27% 12% 3	370
	21st to end	Day	25% 25% 33% 13% 3 1	407
February	1st to 10th	Day	33% 21% 28% 16% 2	370
	11th to 20th	Day	36% 27% 23% 13% 1	366
	21st to end	Day	32% 18% 32% 15% 2 1	331
March	1st to 10th	Day	34% 24% 30% 9% 3	420
	11th to 20th	Day	34% 25% 26% 9% 5% 1	420
	21st to end	Day	34% 25% 25% 10% 6%	462
April	1st to 10th	Day	42% 23% 25% 7% 3	420
	11th to 20th	Day	33% 24% 30% 10% 3	412
	21st to end	Day	37% 18% 28% 12% 5%	420
May	1st to 10th	Day	34% 26% 26% 9% 3 1	423
	11th to 20th	Day	29% 20% 30% 17% 4 1	605
	21st to end	Day	33% 15% 31% 16% 4 1	680
June	1st to 10th	Day	34% 14% 31% 17% 3	630
	11th to 20th	Day	26% 16% 34% 18% 5% 1	630
	21st to end	Day	30% 13% 31% 19% 6% 1	630
July	1st to 10th	Day	23% 11% 36% 22% 7% 1	620
	11th to 20th	Day	22% 8% 37% 22% 10% 1	618
	21st to end	Day	25% 12% 34% 22% 6% 1	516
August	1st to 10th	Day	17% 11% 38% 24% 8% 1	446
	11th to 20th	Day	21% 14% 34% 20% 9% 2	439
	21st to end	Day	21% 12% 33% 23% 9% 2	495
September	1st to 10th	Day	19% 12% 37% 24% 7% 1	450
	11th to 20th	Day	26% 16% 30% 18% 7% 4	450
	21st to end	Day	23% 17% 33% 17% 8% 3	439
October	1st to 10th	Day	24% 15% 32% 18% 9% 3	360
	11th to 20th	Day	26% 18% 28% 20% 6% 3	360
	21st to end	Day	34% 19% 27% 14% 6% 1	396
November	1st to 10th	Day	27% 17% 32% 15% 8% 1	365
	11th to 20th	Day	38% 17% 24% 15% 5% 1	370
	21st to end	Day	33% 19% 33% 9% 4 1	370
December	1st to 10th	Day	39% 19% 26% 15% 2	370
	11th to 20th	Day	44% 21% 22% 11% 2	370
	21st to end	Day	37% 22% 25% 12% 4 1	407
January	1st to 10th	Night	31% 19% 31% 16% 2	850
	11th to 20th	Night	31% 19% 28% 19% 2	783
	21st to end	Night	25% 20% 33% 18% 4	836
February	1st to 10th	Night	31% 18% 30% 19% 2	760
	11th to 20th	Night	30% 21% 33% 14% 2	743
	21st to end	Night	23% 18% 36% 19% 4	628
March	1st to 10th	Night	28% 19% 33% 17% 2	723
	11th to 20th	Night	28% 19% 28% 20% 5%	720
	21st to end	Night	26% 20% 33% 16% 5%	792
April	1st to 10th	Night	37% 16% 32% 13% 3	586
	11th to 20th	Night	30% 19% 34% 15% 2	534
	21st to end	Night	31% 16% 29% 19% 5%	540
May	1st to 10th	Night	30% 15% 31% 19% 5%	540
	11th to 20th	Night	28% 13% 36% 20% 4	532
	21st to end	Night	25% 14% 38% 19% 4	583
June	1st to 10th	Night	31% 9% 37% 19% 4	540
	11th to 20th	Night	24% 11% 36% 22% 6%	418
	21st to end	Night	30% 6% 34% 23% 6%	360
July	1st to 10th	Night	22% 5% 39% 25% 9%	350
	11th to 20th	Night	18% 7% 39% 27% 8%	522
	21st to end	Night	20% 6% 37% 30% 6%	590
August	1st to 10th	Night	16% 8% 36% 30% 10% 1	538
	11th to 20th	Night	20% 7% 34% 28% 10% 1	532
	21st to end	Night	18% 8% 34% 28% 12% 1	594
September	1st to 10th	Night	21% 9% 34% 27% 10%	540
	11th to 20th	Night	22% 10% 29% 23% 13% 2	661
	21st to end	Night	23% 12% 31% 21% 11% 1	720
October	1st to 10th	Night	23% 10% 32% 26% 9% 1	720
	11th to 20th	Night	24% 14% 29% 22% 9% 1	720
	21st to end	Night	31% 14% 29% 21% 5%	792
November	1st to 10th	Night	28% 12% 28% 24% 6% 1	789
	11th to 20th	Night	29% 18% 26% 21% 6%	850
	21st to end	Night	29% 20% 27% 18% 6%	850
December	1st to 10th	Night	33% 16% 29% 17% 4	850
	11th to 20th	Night	35% 22% 26% 14% 3	850
	21st to end	Night	34% 18% 28% 18% 3	935

Page generated at 2024-02-27 07:30:14. Version ac07

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