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 2024-10-25.

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	21% 11% 3 8% 5% 4 4 3 5% 6% 30%	101999
	Night	21% 11% 3 8% 5% 4 4 3 5% 6% 29%	96859
Transparency	Day	54% 4 12% 19% 11% 1	101761
	Night	55% 3 12% 20% 10% 1	96717
Seeing	Day	30% 18% 31% 16% 5% 1	17207
	Night	27% 15% 32% 20% 5%	24633

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	17% 13% 5% 11% 7% 6% 5% 4 4 6% 23%	2526
	11th to 20th	Day	19% 13% 5% 17% 6% 6% 4 4 5% 5% 17%	2751
	21st to end	Day	20% 11% 6% 11% 6% 5% 4 3 5% 5% 24%	3124
February	1st to 10th	Day	21% 14% 5% 11% 6% 4 5% 4 5% 5% 21%	1710
	11th to 20th	Day	18% 14% 4 13% 6% 5% 5% 3 5% 5% 22%	1663
	21st to end	Day	13% 16% 4 9% 6% 5% 4 3 5% 6% 29%	1461
March	1st to 10th	Day	26% 14% 4 7% 6% 5% 3 2 3 5% 25%	3425
	11th to 20th	Day	19% 17% 4 8% 5% 4 5% 3 4 5% 25%	3480
	21st to end	Day	31% 15% 5% 9% 5% 3 3 2 3 4 21%	3816
April	1st to 10th	Day	26% 15% 4 7% 4 3 3 2 4 5% 26%	2232
	11th to 20th	Day	22% 10% 3 5% 4 3 4 3 5% 6% 34%	2359
	21st to end	Day	25% 11% 2 5% 4 4 4 3 4 6% 34%	2470
May	1st to 10th	Day	25% 13% 3 8% 5% 4 4 3 5% 6% 25%	4106
	11th to 20th	Day	24% 12% 3 7% 4 3 4 3 4 5% 30%	4365
	21st to end	Day	19% 8% 3 6% 4 4 4 3 5% 8% 36%	4836
June	1st to 10th	Day	26% 10% 3 7% 4 4 4 3 5% 7% 29%	2660
	11th to 20th	Day	22% 8% 3 7% 4 3 4 3 5% 6% 36%	2801
	21st to end	Day	25% 10% 3 7% 6% 4 4 4 5% 8% 26%	2850
July	1st to 10th	Day	22% 9% 3 6% 4 4 4 4 5% 8% 31%	4710
	11th to 20th	Day	21% 10% 3 6% 4 4 4 3 5% 8% 33%	4440
	21st to end	Day	19% 10% 3 7% 5% 4 4 4 5% 8% 31%	4509
August	1st to 10th	Day	24% 10% 3 7% 4 4 5% 4 5% 7% 28%	4105
	11th to 20th	Day	16% 8% 3 7% 5% 4 5% 3 7% 8% 34%	4045
	21st to end	Day	10% 6% 2 5% 3 4 4 4 6% 9% 47%	4404
September	1st to 10th	Day	17% 7% 1 6% 4 4 4 3 5% 7% 42%	2280
	11th to 20th	Day	18% 8% 2 5% 3 3 3 3 4 6% 44%	2148
	21st to end	Day	20% 8% 2 6% 3 4 3 3 4 5% 42%	2066
October	1st to 10th	Day	19% 7% 3 6% 4 3 4 3 6% 8% 37%	1900
	11th to 20th	Day	19% 8% 2 6% 4 4 5% 4 5% 7% 34%	1900
	21st to end	Day	22% 10% 3 8% 4 3 4 3 4 6% 31%	2028
November	1st to 10th	Day	20% 12% 3 8% 4 4 3 3 4 5% 33%	1580
	11th to 20th	Day	22% 11% 4 8% 5% 5% 5% 3 4 7% 27%	1520
	21st to end	Day	21% 12% 5% 10% 6% 5% 4 3 4 4 26%	1520
December	1st to 10th	Day	26% 15% 4 9% 6% 3 4 3 5% 4 20%	1520
	11th to 20th	Day	30% 13% 4 8% 6% 5% 4 4 4 6% 17%	1906
	21st to end	Day	22% 13% 7% 9% 5% 4 4 3 5% 5% 22%	2783
January	1st to 10th	Night	16% 12% 4 16% 7% 6% 5% 4 5% 5% 21%	4429
	11th to 20th	Night	19% 15% 5% 16% 7% 4 4 3 4 5% 17%	4207
	21st to end	Night	19% 13% 4 12% 6% 5% 6% 4 5% 6% 21%	4532
February	1st to 10th	Night	20% 13% 4 9% 7% 5% 5% 4 6% 6% 21%	2470
	11th to 20th	Night	18% 12% 4 10% 7% 6% 6% 4 6% 5% 22%	2403
	21st to end	Night	13% 13% 5% 9% 6% 5% 5% 4 6% 6% 28%	1989
March	1st to 10th	Night	24% 14% 2 7% 7% 5% 4 3 4 5% 27%	3415
	11th to 20th	Night	18% 16% 5% 8% 6% 5% 5% 4 5% 7% 23%	3479
	21st to end	Night	32% 11% 4 10% 3 3 2 2 3 4 26%	3816
April	1st to 10th	Night	24% 13% 3 7% 4 4 4 3 4 5% 29%	1948
	11th to 20th	Night	26% 9% 2 6% 3 3 4 3 4 6% 33%	1768
	21st to end	Night	26% 9% 3 7% 4 4 3 2 4 5% 33%	1710
May	1st to 10th	Night	20% 15% 4 8% 5% 4 3 3 5% 6% 27%	2834
	11th to 20th	Night	23% 12% 3 8% 4 4 4 3 5% 6% 28%	2537
	21st to end	Night	19% 10% 3 8% 5% 4 4 3 5% 7% 32%	2749
June	1st to 10th	Night	28% 8% 3 6% 3 3 3 3 5% 6% 32%	1520
	11th to 20th	Night	21% 9% 3 6% 4 4 4 3 5% 6% 36%	1391
	21st to end	Night	26% 9% 2 7% 5% 3 5% 3 5% 6% 28%	1330
July	1st to 10th	Night	22% 11% 3 7% 5% 4 5% 4 6% 7% 28%	2210
	11th to 20th	Night	24% 8% 3 6% 5% 4 4 3 5% 8% 31%	2530
	21st to end	Night	19% 7% 2 6% 4 4 5% 4 5% 6% 38%	3044
August	1st to 10th	Night	25% 9% 3 6% 3 3 3 2 4 6% 35%	2825
	11th to 20th	Night	18% 8% 3 8% 4 3 4 3 5% 6% 37%	2782
	21st to end	Night	10% 6% 2 5% 4 3 4 3 5% 7% 51%	3252
September	1st to 10th	Night	17% 6% 3 5% 3 3 3 3 4 7% 45%	1900
	11th to 20th	Night	19% 7% 2 5% 2 2 3 3 5% 6% 46%	2028
	21st to end	Night	20% 9% 3 6% 5% 4 3 3 4 6% 38%	2114
October	1st to 10th	Night	20% 7% 2 6% 4 3 4 3 6% 6% 40%	2280
	11th to 20th	Night	19% 8% 2 5% 4 4 3 3 5% 7% 40%	2280
	21st to end	Night	24% 8% 2 6% 4 4 4 4 4 6% 34%	2434
November	1st to 10th	Night	21% 8% 3 6% 5% 4 4 3 5% 7% 34%	2496
	11th to 20th	Night	20% 10% 3 8% 5% 5% 5% 4 6% 6% 28%	2660
	21st to end	Night	20% 11% 4 8% 5% 4 4 4 5% 7% 27%	2660
December	1st to 10th	Night	24% 13% 4 9% 5% 4 4 4 5% 7% 21%	2660
	11th to 20th	Night	30% 11% 4 7% 5% 4 4 3 5% 6% 20%	3293
	21st to end	Night	25% 11% 5% 10% 4 4 4 3 4 5% 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	54% 3 12% 19% 10% 3	1461
March	1st to 10th	Day	63% 2 9% 17% 7% 2	3429
	11th to 20th	Day	59% 3 12% 16% 9% 1	3480
	21st to end	Day	69% 2 5% 12% 10% 1	3816
April	1st to 10th	Day	61% 3 7% 14% 13% 2	2232
	11th to 20th	Day	51% 4 9% 22% 13% 1	2359
	21st to end	Day	53% 3 9% 19% 13% 3	2470
May	1st to 10th	Day	59% 3 13% 17% 7% 1	4120
	11th to 20th	Day	56% 4 11% 19% 9% 1	4369
	21st to end	Day	47% 4 16% 19% 13% 1	4836
June	1st to 10th	Day	56% 4 9% 20% 11%	2660
	11th to 20th	Day	50% 4 10% 20% 13% 2	2801
	21st to end	Day	57% 6% 11% 16% 10% 1	2850
July	1st to 10th	Day	51% 4 13% 18% 12% 2	4636
	11th to 20th	Day	51% 3 11% 23% 10% 1	4364
	21st to end	Day	49% 4 14% 21% 11% 1	4365
August	1st to 10th	Day	55% 5% 12% 18% 9% 1	4092
	11th to 20th	Day	47% 4 14% 27% 9%	4084
	21st to end	Day	34% 4 13% 28% 21% 1	4404
September	1st to 10th	Day	41% 4 12% 24% 16% 2	2280
	11th to 20th	Day	43% 3 9% 26% 18% 2	2148
	21st to end	Day	44% 4 7% 25% 18% 1	2066
October	1st to 10th	Day	45% 4 10% 27% 13% 2	1900
	11th to 20th	Day	47% 4 12% 22% 14% 1	1900
	21st to end	Day	54% 3 11% 21% 10% 1	2028
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	61% 3 8% 16% 11% 1	3424
	11th to 20th	Night	60% 4 13% 14% 8% 1	3480
	21st to end	Night	64% 2 7% 15% 10% 2	3816
April	1st to 10th	Night	57% 3 9% 15% 13% 3	1948
	11th to 20th	Night	52% 2 10% 22% 13% 2	1768
	21st to end	Night	55% 2 8% 20% 12% 3	1710
May	1st to 10th	Night	59% 2 14% 19% 7% 1	2840
	11th to 20th	Night	58% 3 10% 22% 7% 1	2538
	21st to end	Night	52% 5% 12% 23% 8%	2750
June	1st to 10th	Night	53% 4 11% 22% 10%	1520
	11th to 20th	Night	50% 3 13% 21% 12% 1	1391
	21st to end	Night	58% 5% 11% 15% 11% 1	1330
July	1st to 10th	Night	55% 4 11% 18% 10% 1	2175
	11th to 20th	Night	53% 4 13% 19% 10% 1	2482
	21st to end	Night	47% 4 13% 23% 12% 1	2948
August	1st to 10th	Night	52% 3 12% 22% 10%	2813
	11th to 20th	Night	47% 4 16% 25% 7%	2809
	21st to end	Night	32% 4 15% 28% 21% 1	3251
September	1st to 10th	Night	39% 4 10% 28% 17% 2	1900
	11th to 20th	Night	41% 2 8% 30% 18% 2	2028
	21st to end	Night	48% 4 7% 25% 15% 2	2114
October	1st to 10th	Night	45% 3 12% 24% 14% 2	2280
	11th to 20th	Night	44% 3 13% 27% 13%	2280
	21st to end	Night	50% 4 11% 21% 13% 1	2434
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	36% 24% 29% 9% 3	460
	11th to 20th	Day	35% 26% 25% 9% 4 1	460
	21st to end	Day	37% 25% 24% 9% 5%	506
April	1st to 10th	Day	41% 24% 25% 7% 3	460
	11th to 20th	Day	32% 25% 30% 11% 3	452
	21st to end	Day	35% 19% 28% 12% 4	460
May	1st to 10th	Day	33% 25% 29% 9% 3 1	463
	11th to 20th	Day	28% 20% 30% 17% 4 1	654
	21st to end	Day	31% 16% 32% 16% 4 1	735
June	1st to 10th	Day	33% 15% 32% 17% 3	680
	11th to 20th	Day	25% 16% 35% 19% 5% 1	680
	21st to end	Day	32% 14% 30% 18% 5% 1	680
July	1st to 10th	Day	24% 11% 36% 21% 7% 1	670
	11th to 20th	Day	23% 8% 38% 22% 9% 1	668
	21st to end	Day	24% 12% 35% 22% 6% 1	561
August	1st to 10th	Day	19% 11% 37% 23% 8% 1	486
	11th to 20th	Day	20% 15% 35% 20% 9% 2	479
	21st to end	Day	20% 13% 34% 22% 9% 2	539
September	1st to 10th	Day	20% 13% 36% 23% 7% 1	490
	11th to 20th	Day	26% 15% 29% 19% 8% 3	490
	21st to end	Day	23% 17% 33% 18% 7% 2	477
October	1st to 10th	Day	23% 16% 32% 18% 9% 3	390
	11th to 20th	Day	26% 18% 28% 19% 6% 3	390
	21st to end	Day	33% 19% 27% 15% 6% 1	411
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	22% 18% 37% 18% 4	628
March	1st to 10th	Night	29% 19% 33% 17% 2	760
	11th to 20th	Night	27% 20% 29% 19% 5%	760
	21st to end	Night	28% 20% 32% 16% 4	836
April	1st to 10th	Night	35% 16% 32% 14% 2	618
	11th to 20th	Night	30% 19% 34% 15% 2	564
	21st to end	Night	30% 17% 30% 18% 5%	570
May	1st to 10th	Night	30% 15% 32% 19% 5%	570
	11th to 20th	Night	28% 12% 35% 21% 4	562
	21st to end	Night	24% 14% 39% 19% 5%	616
June	1st to 10th	Night	32% 8% 37% 19% 4	570
	11th to 20th	Night	23% 11% 37% 22% 6%	441
	21st to end	Night	31% 6% 34% 23% 6%	380
July	1st to 10th	Night	23% 5% 39% 25% 9%	370
	11th to 20th	Night	19% 7% 39% 27% 8%	552
	21st to end	Night	20% 6% 38% 30% 6%	623
August	1st to 10th	Night	17% 8% 35% 29% 10% 1	568
	11th to 20th	Night	20% 7% 34% 28% 10% 1	562
	21st to end	Night	17% 8% 34% 28% 12% 1	627
September	1st to 10th	Night	21% 9% 34% 26% 10%	570
	11th to 20th	Night	22% 10% 28% 26% 13% 2	698
	21st to end	Night	24% 12% 31% 22% 10% 1	760
October	1st to 10th	Night	23% 11% 32% 26% 9% 1	760
	11th to 20th	Night	24% 15% 29% 22% 9% 1	760
	21st to end	Night	30% 14% 30% 21% 5%	812
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 2024-10-22 21:20:59. Version ac07

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