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 2024-03-06.

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	18% 10% 4 7% 6% 3 5% 5% 5% 6% 32%	78361
	Night	18% 11% 4 8% 6% 3 4 4 5% 6% 31%	81153
Transparency	Day	36% 37% 8% 12% 6% 1	78066
	Night	38% 35% 8% 12% 6% 1	80982
Seeing	Day	24% 16% 31% 19% 8% 2	13495
	Night	23% 14% 28% 25% 9% 1	22773

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	16% 17% 8% 11% 7% 4 5% 5% 3 4 21%	2517
	11th to 20th	Day	14% 14% 7% 13% 8% 4 5% 4 5% 5% 21%	2520
	21st to end	Day	14% 17% 7% 11% 9% 5% 5% 5% 4 4 18%	2900
February	1st to 10th	Day	14% 15% 5% 12% 8% 4 4 4 5% 5% 24%	1710
	11th to 20th	Day	13% 15% 6% 10% 6% 3 4 5% 4 5% 28%	1663
	21st to end	Day	20% 12% 4 8% 7% 3 5% 4 6% 5% 26%	1563
March	1st to 10th	Day	16% 13% 4 8% 8% 4 5% 5% 5% 5% 28%	1853
	11th to 20th	Day	15% 13% 4 9% 7% 4 5% 3 4 6% 30%	1980
	21st to end	Day	19% 9% 3 7% 5% 3 4 4 4 5% 36%	2287
April	1st to 10th	Day	23% 12% 4 5% 6% 3 4 4 3 5% 31%	2160
	11th to 20th	Day	22% 9% 3 5% 5% 2 4 4 4 4 37%	2134
	21st to end	Day	22% 11% 4 7% 6% 2 4 4 4 4 31%	2297
May	1st to 10th	Day	21% 8% 3 6% 5% 3 5% 4 4 5% 35%	2520
	11th to 20th	Day	17% 7% 3 7% 6% 4 4 3 4 6% 38%	2478
	21st to end	Day	17% 6% 3 5% 6% 4 5% 5% 5% 7% 37%	2725
June	1st to 10th	Day	22% 7% 3 6% 5% 3 6% 5% 5% 7% 29%	2520
	11th to 20th	Day	16% 5% 2 6% 5% 4 5% 5% 6% 8% 38%	2520
	21st to end	Day	19% 7% 3 5% 6% 4 5% 6% 6% 8% 31%	2520
July	1st to 10th	Day	12% 5% 2 6% 5% 4 5% 7% 7% 9% 39%	2520
	11th to 20th	Day	12% 6% 3 5% 6% 4 5% 6% 7% 8% 39%	2520
	21st to end	Day	13% 5% 2 6% 6% 3 5% 6% 6% 9% 39%	2744
August	1st to 10th	Day	12% 6% 2 6% 6% 4 6% 6% 6% 8% 39%	2466
	11th to 20th	Day	13% 5% 3 6% 6% 3 5% 4 7% 9% 38%	2289
	21st to end	Day	15% 6% 2 5% 5% 3 4 5% 6% 8% 40%	2376
September	1st to 10th	Day	14% 5% 3 5% 5% 4 4 5% 6% 7% 42%	2160
	11th to 20th	Day	13% 5% 3 5% 5% 3 4 4 6% 7% 45%	2160
	21st to end	Day	18% 6% 2 7% 5% 3 4 4 5% 7% 39%	1918
October	1st to 10th	Day	22% 7% 3 6% 5% 3 3 4 4 7% 35%	1800
	11th to 20th	Day	25% 11% 3 6% 5% 4 5% 5% 5% 7% 26%	1800
	21st to end	Day	27% 10% 3 7% 6% 4 3 4 4 5% 27%	1841
November	1st to 10th	Day	17% 8% 3 6% 6% 4 4 5% 6% 7% 34%	1662
	11th to 20th	Day	20% 12% 5% 6% 7% 3 4 5% 5% 6% 26%	1520
	21st to end	Day	22% 15% 4 9% 7% 4 4 5% 4 6% 20%	1520
December	1st to 10th	Day	22% 18% 7% 10% 6% 3 4 3 5% 6% 16%	1520
	11th to 20th	Day	21% 13% 5% 9% 7% 3 4 5% 4 5% 25%	1906
	21st to end	Day	28% 18% 5% 9% 5% 3 3 3 3 3 19%	2772
January	1st to 10th	Night	17% 18% 7% 10% 7% 3 4 4 4 5% 19%	4429
	11th to 20th	Night	13% 15% 6% 11% 9% 4 6% 5% 4 5% 23%	4440
	21st to end	Night	15% 18% 7% 10% 9% 5% 4 3 3 4 20%	4753
February	1st to 10th	Night	14% 13% 6% 11% 8% 4 5% 4 5% 6% 24%	2470
	11th to 20th	Night	13% 13% 6% 10% 8% 3 4 4 4 5% 29%	2403
	21st to end	Night	16% 12% 5% 8% 7% 4 5% 4 5% 5% 28%	1890
March	1st to 10th	Night	18% 13% 4 7% 7% 4 5% 4 4 5% 29%	2209
	11th to 20th	Night	17% 11% 5% 8% 5% 4 4 4 4 5% 33%	1979
	21st to end	Night	17% 10% 3 6% 6% 3 3 3 4 5% 40%	2067
April	1st to 10th	Night	21% 10% 4 7% 4 4 4 4 5% 6% 33%	1800
	11th to 20th	Night	19% 9% 3 6% 7% 3 4 4 4 6% 35%	1775
	21st to end	Night	21% 10% 3 7% 4 3 4 4 5% 6% 32%	1680
May	1st to 10th	Night	21% 7% 3 5% 5% 3 3 5% 5% 6% 38%	1440
	11th to 20th	Night	18% 8% 3 5% 5% 3 4 4 4 6% 40%	1415
	21st to end	Night	13% 6% 2 5% 5% 4 4 5% 5% 7% 44%	1550
June	1st to 10th	Night	18% 5% 2 5% 6% 4 5% 6% 6% 8% 35%	1440
	11th to 20th	Night	14% 5% 2 6% 6% 2 5% 5% 5% 8% 43%	1440
	21st to end	Night	17% 7% 2 5% 4 4 6% 5% 6% 7% 37%	1440
July	1st to 10th	Night	11% 5% 2 5% 6% 2 5% 5% 5% 7% 48%	1440
	11th to 20th	Night	12% 6% 2 6% 5% 2 4 5% 6% 9% 43%	1440
	21st to end	Night	10% 4 1 5% 6% 4 5% 5% 7% 9% 43%	1574
August	1st to 10th	Night	10% 7% 3 6% 6% 3 4 5% 7% 9% 42%	1470
	11th to 20th	Night	10% 5% 3 6% 4 3 4 5% 7% 8% 45%	1598
	21st to end	Night	11% 6% 2 6% 5% 3 5% 5% 6% 7% 45%	1975
September	1st to 10th	Night	12% 6% 2 5% 5% 4 4 5% 4 6% 47%	1800
	11th to 20th	Night	15% 5% 2 4 4 2 3 5% 5% 7% 48%	1800
	21st to end	Night	19% 5% 3 6% 5% 2 3 3 4 6% 43%	2037
October	1st to 10th	Night	20% 8% 3 5% 5% 3 4 4 4 7% 37%	2160
	11th to 20th	Night	23% 7% 3 6% 6% 4 5% 4 5% 6% 30%	2160
	21st to end	Night	24% 10% 3 7% 6% 4 4 4 5% 6% 27%	2515
November	1st to 10th	Night	20% 10% 3 5% 6% 3 4 4 5% 6% 33%	2412
	11th to 20th	Night	20% 11% 4 8% 6% 4 5% 4 5% 6% 28%	2660
	21st to end	Night	22% 13% 5% 9% 6% 3 5% 4 4 6% 24%	2660
December	1st to 10th	Night	22% 16% 6% 9% 7% 3 5% 5% 5% 5% 17%	2660
	11th to 20th	Night	22% 15% 5% 8% 7% 3 4 3 3 4 26%	3288
	21st to end	Night	29% 18% 4 9% 6% 3 4 3 3 4 18%	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	48% 31% 9% 7% 4 1	2518
	11th to 20th	Day	50% 26% 11% 9% 4	2520
	21st to end	Day	57% 26% 7% 6% 4	2900
February	1st to 10th	Day	40% 35% 8% 13% 3 1	1710
	11th to 20th	Day	39% 36% 9% 9% 5% 1	1672
	21st to end	Day	40% 36% 7% 10% 6% 1	1563
March	1st to 10th	Day	39% 37% 7% 12% 5%	1856
	11th to 20th	Day	38% 38% 9% 10% 5%	1980
	21st to end	Day	33% 37% 6% 13% 8% 3	2287
April	1st to 10th	Day	35% 36% 5% 14% 7% 2	2160
	11th to 20th	Day	34% 35% 6% 13% 11% 1	2134
	21st to end	Day	37% 37% 5% 9% 8% 4	2297
May	1st to 10th	Day	32% 38% 6% 12% 10% 3	2520
	11th to 20th	Day	31% 37% 6% 13% 11% 3	2482
	21st to end	Day	28% 38% 7% 14% 11% 2	2725
June	1st to 10th	Day	36% 39% 7% 10% 7%	2520
	11th to 20th	Day	27% 39% 8% 17% 8% 1	2520
	21st to end	Day	34% 40% 9% 10% 6%	2520
July	1st to 10th	Day	27% 41% 8% 18% 6%	2450
	11th to 20th	Day	27% 40% 10% 14% 8%	2445
	21st to end	Day	27% 41% 10% 16% 7%	2591
August	1st to 10th	Day	28% 40% 9% 18% 6%	2452
	11th to 20th	Day	25% 38% 12% 18% 6% 1	2289
	21st to end	Day	27% 39% 9% 16% 9% 1	2376
September	1st to 10th	Day	25% 39% 8% 20% 7%	2160
	11th to 20th	Day	27% 38% 9% 17% 8%	2160
	21st to end	Day	31% 39% 8% 18% 4	1918
October	1st to 10th	Day	34% 38% 8% 13% 6% 1	1800
	11th to 20th	Day	38% 39% 9% 9% 4	1800
	21st to end	Day	39% 38% 8% 9% 5%	1841
November	1st to 10th	Day	26% 43% 9% 17% 5%	1662
	11th to 20th	Day	36% 41% 8% 7% 7%	1520
	21st to end	Day	41% 42% 8% 6% 3	1520
December	1st to 10th	Day	45% 41% 7% 5% 1	1520
	11th to 20th	Day	43% 34% 11% 9% 3	1906
	21st to end	Day	57% 25% 5% 11% 2	2772
January	1st to 10th	Night	51% 28% 11% 8% 2	4429
	11th to 20th	Night	48% 28% 11% 10% 3	4440
	21st to end	Night	58% 24% 8% 7% 4	4753
February	1st to 10th	Night	41% 36% 7% 10% 5% 1	2470
	11th to 20th	Night	40% 36% 8% 11% 4 1	2405
	21st to end	Night	40% 35% 7% 13% 5% 1	1890
March	1st to 10th	Night	39% 36% 7% 12% 5% 1	2219
	11th to 20th	Night	38% 37% 8% 12% 5% 1	1980
	21st to end	Night	31% 36% 7% 13% 10% 3	2067
April	1st to 10th	Night	35% 37% 7% 10% 9% 2	1800
	11th to 20th	Night	34% 37% 6% 13% 10% 1	1775
	21st to end	Night	35% 36% 5% 11% 9% 3	1680
May	1st to 10th	Night	30% 37% 5% 12% 10% 5%	1440
	11th to 20th	Night	28% 37% 6% 15% 12% 2	1416
	21st to end	Night	25% 39% 8% 13% 14% 2	1551
June	1st to 10th	Night	31% 39% 10% 15% 5% 1	1440
	11th to 20th	Night	26% 39% 8% 16% 8% 2	1440
	21st to end	Night	30% 41% 8% 12% 8%	1440
July	1st to 10th	Night	25% 41% 9% 18% 7% 1	1400
	11th to 20th	Night	27% 39% 8% 18% 8%	1392
	21st to end	Night	25% 41% 9% 15% 10%	1486
August	1st to 10th	Night	28% 39% 10% 15% 8%	1460
	11th to 20th	Night	22% 37% 11% 20% 9%	1598
	21st to end	Night	26% 40% 10% 17% 8%	1975
September	1st to 10th	Night	26% 38% 7% 19% 10%	1800
	11th to 20th	Night	25% 38% 9% 21% 6% 1	1800
	21st to end	Night	30% 38% 8% 19% 6%	2037
October	1st to 10th	Night	32% 39% 8% 14% 8%	2160
	11th to 20th	Night	38% 38% 8% 11% 5%	2160
	21st to end	Night	37% 39% 9% 9% 5%	2515
November	1st to 10th	Night	30% 41% 8% 14% 5%	2412
	11th to 20th	Night	35% 41% 8% 9% 6% 1	2660
	21st to end	Night	39% 42% 7% 9% 2	2660
December	1st to 10th	Night	44% 41% 7% 6% 1	2660
	11th to 20th	Night	44% 33% 7% 12% 4 1	3288
	21st to end	Night	57% 26% 5% 10% 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	27% 19% 34% 16% 4	180
	11th to 20th	Day	29% 19% 36% 13% 2 1	180
	21st to end	Day	21% 20% 36% 18% 5%	234
February	1st to 10th	Day	31% 26% 30% 10% 3	270
	11th to 20th	Day	28% 30% 36% 6% 1	270
	21st to end	Day	35% 22% 29% 14% 1	375
March	1st to 10th	Day	29% 20% 31% 15% 5%	440
	11th to 20th	Day	28% 21% 33% 14% 4 1	420
	21st to end	Day	33% 17% 30% 15% 5% 1	462
April	1st to 10th	Day	34% 22% 25% 14% 5%	420
	11th to 20th	Day	35% 18% 23% 14% 9% 1	412
	21st to end	Day	31% 21% 30% 13% 5%	420
May	1st to 10th	Day	27% 16% 31% 16% 7% 3	423
	11th to 20th	Day	20% 19% 33% 19% 7% 2	447
	21st to end	Day	23% 14% 34% 18% 9% 2	485
June	1st to 10th	Day	27% 11% 36% 18% 7% 1	450
	11th to 20th	Day	18% 15% 30% 24% 9% 3	450
	21st to end	Day	22% 12% 32% 21% 10% 3	450
July	1st to 10th	Day	12% 10% 30% 33% 12% 3	445
	11th to 20th	Day	14% 10% 34% 26% 13% 3	444
	21st to end	Day	14% 7% 36% 28% 11% 3	488
August	1st to 10th	Day	14% 9% 28% 29% 15% 4	446
	11th to 20th	Day	15% 6% 26% 32% 13% 8%	439
	21st to end	Day	17% 12% 29% 24% 12% 6%	495
September	1st to 10th	Day	16% 12% 29% 23% 12% 7%	450
	11th to 20th	Day	16% 11% 26% 21% 17% 9%	450
	21st to end	Day	20% 13% 29% 21% 13% 4	450
October	1st to 10th	Day	25% 16% 24% 22% 10% 4	450
	11th to 20th	Day	30% 17% 30% 15% 7% 1	450
	21st to end	Day	34% 15% 28% 19% 4	426
November	1st to 10th	Day	26% 16% 31% 18% 7% 1	356
	11th to 20th	Day	29% 26% 30% 11% 4	180
	21st to end	Day	27% 24% 31% 12% 3 2	180
December	1st to 10th	Day	36% 12% 38% 12% 2	180
	11th to 20th	Day	29% 23% 35% 11% 1 1	180
	21st to end	Day	33% 21% 34% 10% 2 1	198
January	1st to 10th	Night	27% 16% 33% 20% 4	760
	11th to 20th	Night	28% 18% 28% 21% 5%	760
	21st to end	Night	20% 14% 36% 24% 5%	836
February	1st to 10th	Night	22% 20% 32% 24% 3	760
	11th to 20th	Night	22% 20% 38% 17% 4	743
	21st to end	Night	25% 18% 30% 23% 4	628
March	1st to 10th	Night	25% 17% 33% 21% 4	743
	11th to 20th	Night	24% 19% 32% 18% 6%	720
	21st to end	Night	24% 18% 30% 22% 7%	792
April	1st to 10th	Night	26% 18% 27% 24% 4	720
	11th to 20th	Night	24% 19% 28% 21% 7% 1	711
	21st to end	Night	26% 16% 28% 23% 7%	600
May	1st to 10th	Night	24% 11% 26% 29% 9% 1	360
	11th to 20th	Night	23% 10% 27% 30% 10%	354
	21st to end	Night	16% 9% 37% 27% 11% 1	389
June	1st to 10th	Night	21% 8% 27% 35% 9%	360
	11th to 20th	Night	16% 9% 24% 34% 15% 1	360
	21st to end	Night	18% 7% 23% 35% 16%	360
July	1st to 10th	Night	11% 5% 28% 39% 18%	350
	11th to 20th	Night	13% 4 22% 43% 17% 1	348
	21st to end	Night	9% 6% 26% 43% 15% 2	394
August	1st to 10th	Night	12% 5% 20% 40% 22% 2	396
	11th to 20th	Night	11% 6% 18% 38% 24% 3	534
	21st to end	Night	15% 6% 25% 34% 18% 2	787
September	1st to 10th	Night	16% 6% 29% 28% 20% 1	720
	11th to 20th	Night	18% 7% 21% 32% 19% 3	720
	21st to end	Night	21% 8% 26% 25% 19% 2	720
October	1st to 10th	Night	23% 12% 25% 24% 15% 1	720
	11th to 20th	Night	27% 12% 29% 24% 7% 1	720
	21st to end	Night	30% 14% 27% 24% 5%	792
November	1st to 10th	Night	27% 13% 26% 25% 8% 1	740
	11th to 20th	Night	27% 16% 32% 16% 9% 1	760
	21st to end	Night	29% 18% 25% 22% 6%	760
December	1st to 10th	Night	31% 16% 30% 20% 3	760
	11th to 20th	Night	27% 19% 28% 20% 5% 1	760
	21st to end	Night	34% 17% 30% 16% 3	836

Page generated at 2024-03-03 06:28:54. Version ac07

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