Luskville Falls
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Luskville Falls clear sky chart from 2005-11-06 to 2025-05-26.

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	17% 11% 4 8% 5% 5% 4 4 5% 7% 31%	114126
	Night	17% 12% 4 9% 5% 5% 4 3 5% 6% 30%	115126
Transparency	Day	31% 42% 7% 13% 6% 1	117652
	Night	34% 40% 7% 12% 6% 1	119764
Seeing	Day	25% 16% 31% 19% 8% 2	15080
	Night	23% 14% 28% 25% 9% 1	24279

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	14% 18% 7% 16% 6% 5% 5% 3 3 4 19%	3597
	11th to 20th	Day	12% 17% 7% 14% 8% 5% 5% 3 5% 5% 21%	3570
	21st to end	Day	10% 17% 7% 14% 7% 6% 4 3 4 6% 20%	4144
February	1st to 10th	Day	13% 16% 5% 13% 8% 5% 4 4 5% 5% 24%	1800
	11th to 20th	Day	13% 16% 5% 11% 6% 4 5% 4 4 5% 27%	1753
	21st to end	Day	20% 13% 4 10% 6% 5% 4 4 5% 4 25%	1643
March	1st to 10th	Day	19% 16% 4 10% 5% 4 4 3 4 6% 24%	4510
	11th to 20th	Day	13% 13% 4 9% 5% 5% 5% 4 5% 7% 29%	4980
	21st to end	Day	18% 12% 3 8% 5% 4 3 3 4 5% 35%	5755
April	1st to 10th	Day	22% 13% 3 6% 5% 4 4 3 4 6% 31%	2400
	11th to 20th	Day	23% 10% 3 6% 4 3 4 3 4 4 36%	2374
	21st to end	Day	22% 11% 4 8% 5% 4 4 3 4 4 32%	2554
May	1st to 10th	Day	21% 9% 3 7% 5% 4 5% 4 6% 6% 30%	4566
	11th to 20th	Day	17% 8% 3 8% 5% 5% 4 3 5% 8% 32%	4538
	21st to end	Day	17% 7% 3 7% 5% 5% 4 4 5% 7% 36%	4907
June	1st to 10th	Day	22% 8% 3 7% 5% 5% 5% 4 5% 7% 29%	2660
	11th to 20th	Day	15% 6% 2 7% 5% 5% 5% 4 6% 8% 38%	2660
	21st to end	Day	19% 7% 3 6% 5% 5% 6% 5% 6% 7% 31%	2660
July	1st to 10th	Day	12% 6% 3 8% 5% 5% 5% 5% 7% 9% 33%	4440
	11th to 20th	Day	13% 6% 2 6% 5% 4 5% 4 6% 7% 40%	4440
	21st to end	Day	11% 6% 2 6% 4 4 4 4 6% 9% 45%	4814
August	1st to 10th	Day	14% 7% 3 8% 5% 5% 5% 4 6% 8% 35%	4341
	11th to 20th	Day	17% 6% 2 6% 4 4 4 3 7% 10% 36%	4016
	21st to end	Day	13% 5% 2 6% 4 4 5% 4 7% 9% 39%	4180
September	1st to 10th	Day	14% 6% 2 5% 4 4 5% 4 6% 7% 43%	2280
	11th to 20th	Day	13% 5% 2 6% 4 4 4 3 6% 7% 46%	2280
	21st to end	Day	18% 7% 2 7% 4 4 4 3 5% 7% 40%	2024
October	1st to 10th	Day	22% 8% 2 7% 5% 4 4 3 4 7% 34%	1900
	11th to 20th	Day	23% 11% 2 7% 4 5% 5% 4 5% 7% 27%	1900
	21st to end	Day	26% 11% 3 8% 5% 5% 3 3 5% 5% 27%	1943
November	1st to 10th	Day	17% 9% 3 7% 6% 5% 4 4 5% 7% 34%	1751
	11th to 20th	Day	19% 13% 4 8% 6% 4 4 4 5% 6% 26%	1600
	21st to end	Day	22% 16% 4 10% 6% 5% 4 4 4 6% 19%	1600
December	1st to 10th	Day	22% 22% 6% 10% 5% 5% 5% 4 5% 5% 13%	2600
	11th to 20th	Day	18% 18% 6% 10% 5% 4 4 3 3 4 25%	2986
	21st to end	Day	23% 17% 5% 11% 5% 5% 4 3 3 4 20%	3960
January	1st to 10th	Night	14% 22% 8% 14% 5% 4 3 3 4 4 18%	6349
	11th to 20th	Night	11% 16% 7% 14% 8% 6% 5% 4 4 5% 21%	6315
	21st to end	Night	12% 18% 7% 14% 7% 6% 4 3 4 4 20%	6795
February	1st to 10th	Night	13% 15% 5% 12% 7% 5% 5% 4 5% 6% 24%	2600
	11th to 20th	Night	13% 15% 6% 11% 7% 4 4 3 4 5% 28%	2533
	21st to end	Night	15% 14% 4 9% 6% 5% 5% 3 5% 5% 28%	1986
March	1st to 10th	Night	22% 15% 4 9% 5% 4 4 2 3 4 28%	5328
	11th to 20th	Night	12% 13% 4 10% 5% 4 5% 4 6% 8% 28%	4979
	21st to end	Night	18% 12% 3 9% 5% 4 3 3 5% 6% 33%	5175
April	1st to 10th	Night	21% 12% 3 8% 4 4 4 4 4 6% 32%	2000
	11th to 20th	Night	19% 10% 3 7% 6% 4 4 3 4 6% 35%	1975
	21st to end	Night	21% 10% 3 7% 4 4 4 3 5% 6% 33%	1864
May	1st to 10th	Night	21% 9% 3 6% 5% 5% 5% 5% 6% 6% 30%	2594
	11th to 20th	Night	19% 8% 2 7% 5% 4 5% 3 5% 6% 36%	2575
	21st to end	Night	15% 7% 3 6% 5% 5% 5% 5% 5% 6% 38%	2784
June	1st to 10th	Night	17% 7% 2 7% 5% 5% 5% 5% 6% 8% 34%	1520
	11th to 20th	Night	14% 5% 2 7% 4 3 4 5% 5% 8% 43%	1520
	21st to end	Night	18% 7% 2 6% 4 6% 5% 4 6% 7% 36%	1520
July	1st to 10th	Night	13% 8% 3 8% 6% 5% 5% 5% 6% 6% 35%	2520
	11th to 20th	Night	14% 7% 2 7% 4 4 5% 4 5% 8% 40%	2520
	21st to end	Night	11% 6% 2 5% 5% 5% 5% 4 7% 8% 44%	2739
August	1st to 10th	Night	12% 8% 3 7% 5% 4 5% 4 6% 8% 38%	2586
	11th to 20th	Night	16% 6% 3 6% 3 4 4 4 6% 7% 41%	2785
	21st to end	Night	14% 5% 2 6% 5% 5% 4 4 6% 8% 41%	3471
September	1st to 10th	Night	12% 6% 2 6% 4 4 4 4 4 6% 48%	1900
	11th to 20th	Night	14% 5% 2 5% 3 3 4 3 5% 6% 49%	1900
	21st to end	Night	19% 6% 2 7% 4 3 3 3 4 6% 44%	2151
October	1st to 10th	Night	19% 8% 2 6% 4 4 4 4 5% 7% 38%	2280
	11th to 20th	Night	22% 8% 3 7% 5% 5% 5% 4 5% 6% 31%	2280
	21st to end	Night	23% 11% 3 9% 4 5% 5% 3 4 6% 27%	2655
November	1st to 10th	Night	20% 10% 2 7% 5% 4 4 3 6% 6% 32%	2543
	11th to 20th	Night	19% 12% 3 9% 5% 6% 4 3 5% 6% 28%	2800
	21st to end	Night	21% 14% 4 10% 5% 4 5% 3 5% 5% 23%	2800
December	1st to 10th	Night	19% 18% 5% 11% 6% 5% 6% 4 5% 6% 14%	4580
	11th to 20th	Night	23% 15% 5% 11% 5% 3 3 2 3 4 25%	5208
	21st to end	Night	25% 19% 4 10% 5% 3 3 3 4 4 21%	6996

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	50% 30% 6% 9% 4 1	3598
	11th to 20th	Day	49% 27% 9% 8% 6%	3600
	21st to end	Day	49% 30% 6% 9% 6% 1	4144
February	1st to 10th	Day	26% 61% 3 6% 3 1	1800
	11th to 20th	Day	24% 60% 3 7% 5%	1762
	21st to end	Day	23% 62% 4 4 6% 2	1643
March	1st to 10th	Day	47% 30% 5% 7% 9% 2	4513
	11th to 20th	Day	37% 30% 13% 11% 7% 1	4980
	21st to end	Day	38% 28% 5% 14% 14% 1	5755
April	1st to 10th	Day	22% 62% 3 6% 7% 1	2400
	11th to 20th	Day	21% 62% 2 9% 5% 1	2374
	21st to end	Day	22% 61% 3 7% 6%	2554
May	1st to 10th	Day	33% 41% 6% 15% 5%	4580
	11th to 20th	Day	31% 43% 9% 12% 4	4542
	21st to end	Day	30% 40% 7% 14% 9%	4907
June	1st to 10th	Day	18% 65% 2 10% 4	2660
	11th to 20th	Day	17% 65% 4 8% 5% 1	2660
	21st to end	Day	17% 63% 3 11% 4	2660
July	1st to 10th	Day	29% 37% 10% 16% 8%	4370
	11th to 20th	Day	26% 37% 9% 23% 4	4365
	21st to end	Day	22% 37% 9% 24% 8%	4661
August	1st to 10th	Day	30% 38% 11% 15% 6%	4327
	11th to 20th	Day	28% 38% 9% 20% 5%	4055
	21st to end	Day	24% 39% 11% 18% 7%	4180
September	1st to 10th	Day	16% 60% 8% 11% 5%	2280
	11th to 20th	Day	13% 60% 5% 15% 6% 1	2280
	21st to end	Day	15% 60% 7% 13% 7%	2024
October	1st to 10th	Day	30% 38% 8% 21% 3	3160
	11th to 20th	Day	26% 38% 10% 19% 7%	3140
	21st to end	Day	30% 38% 14% 14% 4	3181
November	1st to 10th	Day	27% 56% 6% 9% 2 1	1751
	11th to 20th	Day	24% 57% 4 10% 4 1	1600
	21st to end	Day	30% 57% 5% 3 4 1	1600
December	1st to 10th	Day	47% 36% 8% 8% 1	2600
	11th to 20th	Day	46% 32% 7% 10% 6%	2986
	21st to end	Day	51% 27% 4 13% 4	3960
January	1st to 10th	Night	52% 27% 8% 9% 3	6349
	11th to 20th	Night	48% 29% 9% 11% 3	6360
	21st to end	Night	52% 28% 5% 5% 9% 1	6795
February	1st to 10th	Night	23% 62% 3 8% 3	2600
	11th to 20th	Night	23% 60% 3 9% 5%	2535
	21st to end	Night	22% 62% 3 8% 6%	1986
March	1st to 10th	Night	45% 29% 4 10% 9% 3	5338
	11th to 20th	Night	37% 32% 12% 11% 6% 2	4980
	21st to end	Night	39% 28% 6% 15% 9% 2	5175
April	1st to 10th	Night	21% 62% 3 8% 6% 1	2000
	11th to 20th	Night	20% 62% 2 9% 7%	1975
	21st to end	Night	20% 61% 4 7% 7% 1	1864
May	1st to 10th	Night	34% 44% 6% 13% 4	2600
	11th to 20th	Night	32% 42% 8% 13% 5%	2576
	21st to end	Night	29% 41% 7% 12% 9% 1	2785
June	1st to 10th	Night	16% 65% 3 11% 5% 1	1520
	11th to 20th	Night	13% 65% 3 10% 8%	1520
	21st to end	Night	18% 63% 3 10% 6%	1520
July	1st to 10th	Night	34% 38% 9% 10% 9%	2480
	11th to 20th	Night	27% 37% 8% 23% 4	2472
	21st to end	Night	23% 37% 10% 20% 10%	2651
August	1st to 10th	Night	28% 38% 9% 18% 6%	2576
	11th to 20th	Night	29% 39% 9% 20% 3	2812
	21st to end	Night	26% 39% 8% 17% 8% 2	3471
September	1st to 10th	Night	13% 60% 5% 16% 6%	1900
	11th to 20th	Night	14% 60% 5% 15% 5% 1	1900
	21st to end	Night	15% 59% 4 14% 7%	2151
October	1st to 10th	Night	22% 37% 10% 23% 8%	3800
	11th to 20th	Night	25% 37% 11% 20% 7%	3779
	21st to end	Night	30% 38% 13% 14% 7%	4367
November	1st to 10th	Night	25% 56% 6% 9% 3	2543
	11th to 20th	Night	25% 57% 5% 10% 4	2800
	21st to end	Night	27% 57% 5% 7% 4	2800
December	1st to 10th	Night	44% 37% 9% 9% 2	4580
	11th to 20th	Night	45% 31% 4 10% 9% 1	5208
	21st to end	Night	51% 26% 3 10% 9%	6996

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	27% 19% 36% 15% 4	200
	11th to 20th	Day	28% 19% 37% 14% 2 2	200
	21st to end	Day	21% 21% 37% 17% 5%	260
February	1st to 10th	Day	33% 25% 29% 10% 2	300
	11th to 20th	Day	29% 31% 35% 5% 1	300
	21st to end	Day	35% 22% 29% 13% 1	407
March	1st to 10th	Day	30% 20% 32% 14% 5%	500
	11th to 20th	Day	29% 21% 34% 13% 3 1	500
	21st to end	Day	34% 18% 31% 13% 4 1	550
April	1st to 10th	Day	36% 22% 24% 14% 5%	500
	11th to 20th	Day	37% 19% 22% 12% 8% 1	492
	21st to end	Day	31% 22% 30% 12% 5%	500
May	1st to 10th	Day	27% 18% 32% 15% 6% 2	503
	11th to 20th	Day	19% 19% 32% 20% 7% 2	527
	21st to end	Day	25% 13% 32% 19% 9% 1	549
June	1st to 10th	Day	27% 11% 35% 19% 8% 1	490
	11th to 20th	Day	17% 16% 31% 24% 9% 3	490
	21st to end	Day	24% 13% 31% 20% 9% 2	490
July	1st to 10th	Day	12% 10% 32% 32% 11% 3	485
	11th to 20th	Day	14% 11% 35% 25% 12% 3	484
	21st to end	Day	14% 8% 35% 29% 11% 4	532
August	1st to 10th	Day	15% 9% 28% 29% 14% 4	486
	11th to 20th	Day	16% 6% 26% 32% 13% 8%	479
	21st to end	Day	16% 12% 30% 25% 12% 6%	539
September	1st to 10th	Day	17% 12% 30% 23% 12% 6%	490
	11th to 20th	Day	15% 10% 24% 21% 20% 10%	490
	21st to end	Day	20% 12% 29% 21% 13% 4	490
October	1st to 10th	Day	26% 16% 24% 22% 9% 3	490
	11th to 20th	Day	29% 17% 30% 15% 8% 1	490
	21st to end	Day	33% 15% 30% 19% 4	462
November	1st to 10th	Day	26% 18% 31% 18% 6% 1	385
	11th to 20th	Day	27% 27% 31% 12% 4	200
	21st to end	Day	31% 23% 31% 11% 3 2	200
December	1st to 10th	Day	36% 13% 38% 13% 2	200
	11th to 20th	Day	29% 25% 34% 10% 2 1	200
	21st to end	Day	31% 20% 34% 11% 2 1	220
January	1st to 10th	Night	27% 16% 35% 19% 3	800
	11th to 20th	Night	28% 18% 27% 21% 5% 1	800
	21st to end	Night	19% 15% 36% 24% 5%	880
February	1st to 10th	Night	21% 21% 32% 24% 3	800
	11th to 20th	Night	22% 20% 37% 16% 4	783
	21st to end	Night	24% 18% 31% 23% 4	660
March	1st to 10th	Night	25% 17% 32% 21% 4	800
	11th to 20th	Night	24% 20% 32% 19% 6%	800
	21st to end	Night	25% 18% 30% 21% 6%	880
April	1st to 10th	Night	27% 18% 28% 24% 4	800
	11th to 20th	Night	25% 19% 29% 20% 7% 1	791
	21st to end	Night	27% 16% 29% 22% 7%	664
May	1st to 10th	Night	24% 11% 28% 28% 8% 1	400
	11th to 20th	Night	23% 10% 27% 31% 10%	394
	21st to end	Night	17% 8% 37% 26% 10%	423
June	1st to 10th	Night	21% 8% 27% 35% 10%	380
	11th to 20th	Night	16% 9% 24% 35% 15% 1	380
	21st to end	Night	20% 7% 23% 34% 15%	380
July	1st to 10th	Night	11% 5% 28% 38% 17%	370
	11th to 20th	Night	12% 5% 22% 43% 17% 1	368
	21st to end	Night	9% 6% 25% 43% 16% 2	416
August	1st to 10th	Night	12% 5% 20% 40% 21% 1	419
	11th to 20th	Night	12% 6% 17% 37% 24% 3	564
	21st to end	Night	15% 6% 25% 35% 18% 2	831
September	1st to 10th	Night	16% 7% 28% 28% 20% 1	760
	11th to 20th	Night	17% 7% 20% 31% 22% 3	760
	21st to end	Night	21% 8% 25% 26% 18% 2	760
October	1st to 10th	Night	23% 12% 25% 24% 16% 1	760
	11th to 20th	Night	26% 12% 28% 24% 8% 1	760
	21st to end	Night	29% 13% 28% 24% 5%	836
November	1st to 10th	Night	27% 15% 25% 25% 8% 1	780
	11th to 20th	Night	27% 17% 32% 16% 9% 1	800
	21st to end	Night	30% 18% 24% 22% 6%	800
December	1st to 10th	Night	30% 16% 31% 20% 3	800
	11th to 20th	Night	28% 19% 29% 20% 5% 1	800
	21st to end	Night	34% 16% 29% 17% 3	880

Page generated at 2025-05-23 09:21:00. Version ac07

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