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 2026-09-29.

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	16% 10% 3 8% 5% 5% 5% 4 5% 7% 32%	149953
	Night	16% 12% 4 9% 5% 5% 4 3 5% 6% 30%	141434
Transparency	Day	35% 33% 8% 16% 7% 1	153433
	Night	37% 34% 7% 14% 7% 1	146043
Seeing	Day	25% 16% 31% 18% 8% 2	16845
	Night	23% 14% 28% 25% 9% 1	25862

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% 17% 6% 15% 6% 5% 5% 3 4 5% 19%	4661
	11th to 20th	Day	11% 22% 8% 14% 7% 4 5% 3 4 5% 18%	4650
	21st to end	Day	8% 15% 7% 15% 9% 8% 5% 4 4 5% 19%	5364
February	1st to 10th	Day	13% 15% 5% 13% 8% 5% 4 4 5% 5% 24%	1890
	11th to 20th	Day	13% 16% 5% 11% 6% 4 5% 4 5% 5% 26%	1843
	21st to end	Day	19% 13% 4 10% 6% 5% 4 4 5% 4 24%	1723
March	1st to 10th	Day	19% 16% 4 10% 5% 4 4 3 4 6% 23%	4610
	11th to 20th	Day	13% 13% 4 10% 6% 5% 5% 4 5% 7% 29%	5090
	21st to end	Day	18% 12% 3 8% 5% 4 3 3 4 5% 35%	5882
April	1st to 10th	Day	22% 13% 3 6% 5% 4 4 3 4 6% 31%	2520
	11th to 20th	Day	24% 10% 3 6% 4 3 4 3 4 4 35%	2494
	21st to end	Day	21% 11% 4 7% 5% 4 4 3 4 4 32%	2681
May	1st to 10th	Day	21% 9% 3 8% 5% 5% 5% 4 6% 7% 27%	8237
	11th to 20th	Day	16% 8% 3 8% 6% 5% 5% 4 6% 8% 32%	8221
	21st to end	Day	20% 9% 3 7% 4 4 4 4 5% 6% 34%	9060
June	1st to 10th	Day	22% 8% 3 7% 4 5% 5% 4 5% 7% 30%	2940
	11th to 20th	Day	15% 6% 2 7% 5% 5% 5% 4 6% 8% 37%	2940
	21st to end	Day	18% 7% 3 6% 5% 5% 6% 5% 6% 8% 32%	2940
July	1st to 10th	Day	12% 5% 2 7% 5% 5% 5% 5% 7% 10% 36%	8280
	11th to 20th	Day	10% 5% 2 5% 4 4 4 4 6% 9% 46%	8280
	21st to end	Day	11% 5% 2 6% 4 4 5% 4 7% 10% 41%	8993
August	1st to 10th	Day	16% 7% 3 8% 5% 5% 5% 4 5% 7% 34%	6370
	11th to 20th	Day	15% 6% 2 6% 4 4 5% 4 7% 10% 37%	5909
	21st to end	Day	13% 6% 3 6% 4 5% 5% 5% 8% 10% 35%	6080
September	1st to 10th	Day	14% 6% 2 5% 4 4 5% 4 6% 7% 43%	2520
	11th to 20th	Day	12% 5% 2 6% 4 4 4 3 6% 8% 47%	2520
	21st to end	Day	17% 6% 2 7% 4 4 3 3 5% 7% 41%	2216
October	1st to 10th	Day	21% 8% 2 6% 5% 4 4 3 4 7% 36%	2000
	11th to 20th	Day	23% 11% 2 7% 4 5% 5% 4 5% 7% 28%	2000
	21st to end	Day	25% 11% 2 8% 5% 5% 3 4 4 5% 28%	2045
November	1st to 10th	Day	17% 10% 3 7% 6% 5% 4 4 5% 7% 33%	1840
	11th to 20th	Day	19% 14% 4 9% 6% 5% 4 4 5% 6% 25%	1680
	21st to end	Day	22% 16% 4 10% 6% 5% 4 4 4 6% 19%	1680
December	1st to 10th	Day	21% 21% 6% 10% 5% 5% 5% 3 5% 5% 13%	2680
	11th to 20th	Day	18% 18% 6% 11% 5% 4 4 3 3 4 24%	3066
	21st to end	Day	23% 17% 5% 11% 5% 5% 4 3 3 4 19%	4048
January	1st to 10th	Night	13% 20% 8% 14% 6% 5% 4 3 4 5% 19%	8234
	11th to 20th	Night	11% 20% 7% 15% 7% 6% 5% 3 4 5% 18%	8235
	21st to end	Night	9% 17% 6% 13% 8% 7% 5% 4 5% 5% 21%	8800
February	1st to 10th	Night	12% 14% 5% 12% 7% 5% 5% 4 5% 6% 25%	2730
	11th to 20th	Night	12% 15% 5% 12% 7% 4 4 3 4 5% 28%	2663
	21st to end	Night	15% 14% 5% 10% 6% 5% 5% 4 5% 5% 27%	2082
March	1st to 10th	Night	22% 15% 4 9% 5% 4 4 2 3 4 28%	5448
	11th to 20th	Night	12% 13% 4 10% 5% 4 5% 4 6% 8% 28%	5089
	21st to end	Night	18% 12% 3 9% 5% 4 3 3 5% 6% 33%	5290
April	1st to 10th	Night	21% 12% 3 8% 4 4 4 4 4 5% 31%	2100
	11th to 20th	Night	18% 10% 3 8% 6% 4 4 3 4 5% 35%	2075
	21st to end	Night	21% 9% 3 7% 4 4 4 3 5% 6% 34%	1958
May	1st to 10th	Night	20% 10% 3 8% 5% 5% 5% 4 6% 7% 25%	4660
	11th to 20th	Night	16% 8% 2 7% 5% 4 5% 4 5% 7% 37%	4639
	21st to end	Night	19% 8% 3 6% 5% 5% 5% 4 5% 6% 34%	5114
June	1st to 10th	Night	16% 7% 2 7% 5% 5% 5% 4 6% 8% 35%	1680
	11th to 20th	Night	14% 6% 2 7% 4 3 4 4 5% 8% 42%	1680
	21st to end	Night	17% 7% 2 6% 4 6% 5% 4 6% 7% 36%	1680
July	1st to 10th	Night	12% 7% 2 7% 5% 5% 6% 4 6% 9% 37%	4680
	11th to 20th	Night	11% 5% 2 6% 4 4 4 4 5% 8% 46%	4680
	21st to end	Night	12% 6% 2 6% 5% 5% 5% 4 6% 8% 42%	5084
August	1st to 10th	Night	15% 8% 3 7% 5% 4 5% 4 7% 8% 35%	3776
	11th to 20th	Night	14% 7% 3 6% 4 4 4 4 6% 7% 40%	4095
	21st to end	Night	13% 7% 2 7% 5% 5% 5% 4 5% 8% 39%	5040
September	1st to 10th	Night	11% 6% 2 6% 4 4 4 4 4 6% 47%	2100
	11th to 20th	Night	14% 5% 2 5% 3 3 4 3 5% 6% 50%	2100
	21st to end	Night	18% 6% 2 6% 4 4 3 3 4 6% 44%	2355
October	1st to 10th	Night	18% 8% 2 6% 4 4 4 3 5% 7% 40%	2400
	11th to 20th	Night	21% 7% 3 7% 5% 5% 5% 4 5% 5% 31%	2400
	21st to end	Night	22% 11% 3 8% 5% 5% 5% 3 4 7% 28%	2795
November	1st to 10th	Night	20% 11% 3 7% 5% 4 4 3 6% 6% 32%	2674
	11th to 20th	Night	19% 12% 4 9% 5% 6% 4 3 5% 6% 28%	2940
	21st to end	Night	21% 14% 5% 10% 5% 4 5% 3 5% 5% 23%	2940
December	1st to 10th	Night	19% 18% 6% 11% 6% 5% 5% 4 5% 6% 15%	4720
	11th to 20th	Night	23% 15% 5% 11% 5% 3 3 2 3 4 25%	5348
	21st to end	Night	25% 19% 4 10% 5% 3 3 3 3 4 21%	7150

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	52% 25% 8% 12% 4	4662
	11th to 20th	Day	56% 21% 8% 7% 8%	4680
	21st to end	Day	54% 24% 7% 8% 7% 1	5364
February	1st to 10th	Day	27% 58% 3 8% 3 1	1890
	11th to 20th	Day	25% 57% 4 9% 5%	1852
	21st to end	Day	26% 59% 4 4 5% 2	1723
March	1st to 10th	Day	47% 29% 5% 7% 9% 3	4613
	11th to 20th	Day	39% 30% 13% 11% 7% 1	5090
	21st to end	Day	39% 27% 5% 13% 14% 1	5882
April	1st to 10th	Day	24% 59% 3 6% 7% 1	2520
	11th to 20th	Day	24% 59% 2 9% 5% 1	2494
	21st to end	Day	23% 58% 3 8% 7% 1	2681
May	1st to 10th	Day	43% 25% 7% 18% 8% 1	8249
	11th to 20th	Day	40% 26% 10% 18% 6%	8225
	21st to end	Day	42% 23% 8% 19% 9%	9061
June	1st to 10th	Day	21% 59% 3 10% 7% 1	2940
	11th to 20th	Day	20% 59% 5% 10% 5% 1	2940
	21st to end	Day	19% 58% 4 14% 5%	2940
July	1st to 10th	Day	33% 23% 13% 21% 10%	8210
	11th to 20th	Day	26% 22% 11% 31% 9% 1	8205
	21st to end	Day	29% 22% 13% 28% 7%	8795
August	1st to 10th	Day	37% 27% 12% 14% 9% 1	6356
	11th to 20th	Day	31% 28% 13% 24% 5%	5948
	21st to end	Day	31% 30% 15% 19% 6%	6080
September	1st to 10th	Day	18% 55% 8% 14% 6%	2520
	11th to 20th	Day	14% 55% 5% 18% 7%	2520
	21st to end	Day	17% 55% 6% 13% 9%	2216
October	1st to 10th	Day	30% 37% 8% 22% 4	3260
	11th to 20th	Day	27% 37% 10% 19% 7%	3240
	21st to end	Day	31% 37% 14% 15% 4	3283
November	1st to 10th	Day	29% 53% 6% 9% 3 1	1840
	11th to 20th	Day	26% 54% 5% 10% 4 1	1680
	21st to end	Day	31% 55% 5% 4 4	1680
December	1st to 10th	Day	48% 35% 8% 8% 1	2680
	11th to 20th	Day	46% 31% 7% 10% 6%	3066
	21st to end	Day	52% 26% 4 13% 4	4048
January	1st to 10th	Night	54% 22% 8% 11% 4	8234
	11th to 20th	Night	56% 23% 7% 10% 5%	8280
	21st to end	Night	53% 23% 6% 9% 9%	8800
February	1st to 10th	Night	24% 59% 4 10% 4	2730
	11th to 20th	Night	25% 57% 3 10% 5%	2665
	21st to end	Night	24% 59% 3 8% 6%	2082
March	1st to 10th	Night	46% 29% 4 10% 9% 3	5458
	11th to 20th	Night	38% 31% 11% 11% 6% 2	5090
	21st to end	Night	40% 28% 6% 15% 9% 2	5290
April	1st to 10th	Night	23% 59% 3 8% 6% 1	2100
	11th to 20th	Night	22% 59% 3 9% 7%	2075
	21st to end	Night	20% 58% 4 8% 9% 1	1958
May	1st to 10th	Night	45% 26% 7% 16% 5% 1	4666
	11th to 20th	Night	38% 25% 10% 17% 9%	4640
	21st to end	Night	42% 24% 7% 16% 11%	5115
June	1st to 10th	Night	18% 59% 3 12% 7% 1	1680
	11th to 20th	Night	16% 60% 4 12% 8% 1	1680
	21st to end	Night	20% 57% 3 12% 7% 1	1680
July	1st to 10th	Night	36% 23% 14% 16% 11% 1	4640
	11th to 20th	Night	27% 22% 11% 28% 11%	4632
	21st to end	Night	33% 22% 9% 25% 10%	4967
August	1st to 10th	Night	35% 28% 11% 16% 8% 2	3766
	11th to 20th	Night	31% 28% 12% 25% 4	4122
	21st to end	Night	33% 29% 10% 20% 7% 1	5040
September	1st to 10th	Night	15% 55% 6% 17% 6%	2100
	11th to 20th	Night	15% 54% 5% 18% 7% 1	2100
	21st to end	Night	17% 55% 5% 14% 10%	2355
October	1st to 10th	Night	21% 36% 10% 23% 9%	3920
	11th to 20th	Night	25% 36% 11% 20% 7%	3899
	21st to end	Night	30% 37% 12% 15% 7%	4507
November	1st to 10th	Night	27% 53% 7% 9% 3	2674
	11th to 20th	Night	26% 54% 5% 10% 4	2940
	21st to end	Night	29% 54% 5% 8% 4	2940
December	1st to 10th	Night	44% 36% 9% 9% 2	4720
	11th to 20th	Night	46% 30% 4 10% 9% 1	5348
	21st to end	Night	52% 26% 3 10% 9%	7150

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	25% 20% 37% 14% 5%	220
	11th to 20th	Day	29% 20% 35% 12% 2 1	220
	21st to end	Day	20% 21% 37% 17% 5%	286
February	1st to 10th	Day	31% 23% 32% 12% 2	330
	11th to 20th	Day	28% 31% 35% 6% 1	330
	21st to end	Day	33% 23% 30% 13% 1	439
March	1st to 10th	Day	30% 20% 33% 13% 4	540
	11th to 20th	Day	31% 20% 32% 12% 3 1	540
	21st to end	Day	34% 19% 30% 12% 4 1	594
April	1st to 10th	Day	36% 22% 24% 13% 4	540
	11th to 20th	Day	38% 19% 22% 12% 8% 1	532
	21st to end	Day	31% 23% 29% 12% 5% 1	540
May	1st to 10th	Day	27% 18% 31% 15% 6% 2	543
	11th to 20th	Day	20% 19% 32% 20% 7% 2	567
	21st to end	Day	26% 14% 32% 18% 8% 1	617
June	1st to 10th	Day	27% 12% 34% 19% 8% 1	570
	11th to 20th	Day	19% 17% 31% 22% 8% 3	570
	21st to end	Day	22% 15% 32% 20% 8% 2	570
July	1st to 10th	Day	12% 11% 34% 30% 10% 2	565
	11th to 20th	Day	14% 12% 35% 25% 11% 3	564
	21st to end	Day	14% 10% 34% 28% 11% 3	620
August	1st to 10th	Day	15% 9% 29% 30% 13% 4	566
	11th to 20th	Day	16% 7% 29% 30% 12% 7%	559
	21st to end	Day	17% 12% 30% 25% 12% 5%	627
September	1st to 10th	Day	18% 12% 31% 21% 12% 6%	570
	11th to 20th	Day	13% 10% 26% 22% 20% 9%	570
	21st to end	Day	20% 13% 29% 21% 13% 4	562
October	1st to 10th	Day	24% 16% 24% 23% 10% 3	530
	11th to 20th	Day	29% 17% 32% 14% 7% 1	530
	21st to end	Day	33% 14% 30% 19% 3	498
November	1st to 10th	Day	28% 19% 30% 17% 6% 1	414
	11th to 20th	Day	26% 26% 31% 12% 4	220
	21st to end	Day	32% 24% 29% 10% 2 2	220
December	1st to 10th	Day	35% 13% 38% 13% 2	220
	11th to 20th	Day	29% 24% 36% 9% 2	220
	21st to end	Day	32% 20% 34% 11% 2 1	242
January	1st to 10th	Night	26% 16% 35% 20% 3	840
	11th to 20th	Night	29% 19% 27% 20% 5%	840
	21st to end	Night	20% 15% 36% 24% 5%	924
February	1st to 10th	Night	20% 21% 32% 24% 3	840
	11th to 20th	Night	21% 20% 38% 17% 4	823
	21st to end	Night	24% 18% 31% 23% 4	692
March	1st to 10th	Night	26% 17% 33% 20% 4	840
	11th to 20th	Night	25% 20% 31% 18% 5%	840
	21st to end	Night	26% 18% 30% 20% 6%	924
April	1st to 10th	Night	28% 17% 28% 23% 4	840
	11th to 20th	Night	25% 19% 29% 20% 7%	831
	21st to end	Night	26% 16% 29% 22% 7%	698
May	1st to 10th	Night	24% 11% 27% 28% 8% 1	420
	11th to 20th	Night	22% 10% 28% 30% 9%	414
	21st to end	Night	18% 9% 37% 26% 10%	455
June	1st to 10th	Night	20% 8% 27% 35% 10%	420
	11th to 20th	Night	16% 10% 25% 35% 14% 1	420
	21st to end	Night	20% 7% 23% 35% 14%	420
July	1st to 10th	Night	10% 5% 29% 39% 16%	410
	11th to 20th	Night	13% 5% 22% 44% 15%	408
	21st to end	Night	10% 6% 25% 42% 16% 2	460
August	1st to 10th	Night	13% 5% 20% 41% 21% 1	463
	11th to 20th	Night	12% 6% 19% 37% 23% 3	624
	21st to end	Night	15% 6% 24% 36% 17% 2	919
September	1st to 10th	Night	15% 7% 29% 28% 19% 1	840
	11th to 20th	Night	16% 7% 20% 31% 22% 3	840
	21st to end	Night	21% 7% 26% 27% 18% 2	833
October	1st to 10th	Night	22% 12% 25% 24% 16% 1	800
	11th to 20th	Night	26% 13% 30% 24% 7% 1	800
	21st to end	Night	29% 13% 29% 25% 5%	880
November	1st to 10th	Night	28% 15% 25% 25% 7% 1	820
	11th to 20th	Night	27% 16% 32% 16% 8% 1	840
	21st to end	Night	30% 18% 25% 21% 6%	840
December	1st to 10th	Night	29% 17% 30% 20% 3	840
	11th to 20th	Night	28% 19% 29% 19% 5% 1	840
	21st to end	Night	35% 17% 29% 17% 3	924

Page generated at 2026-09-26 04:18:39. Version ac07

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