Finley Point Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Finley Point Campground clear sky chart from 2005-11-06 to 2026-02-01.

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	13% 12% 3 6% 4 4 4 3 5% 7% 39%	136375
	Night	15% 16% 4 7% 4 4 4 3 5% 6% 34%	132927
Transparency	Day	46% 4 13% 21% 12% 4	130990
	Night	52% 4 13% 18% 9% 3	129320
Seeing	Day	20% 9% 22% 27% 18% 4	16735
	Night	25% 6% 17% 33% 17% 2	26121

By Month

Percentage Cloud Cover SW (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	19% 32% 9% 11% 5% 4 4 3 3 4 6%	3296
	11th to 20th	Day	15% 17% 8% 13% 5% 4 3 3 6% 8% 18%	3720
	21st to end	Day	16% 18% 4 8% 4 4 4 3 6% 8% 25%	4092
February	1st to 10th	Day	23% 25% 5% 10% 4 4 3 1 3 5% 16%	1688
	11th to 20th	Day	15% 28% 7% 9% 4 4 4 3 5% 5% 16%	1788
	21st to end	Day	15% 25% 8% 10% 4 4 4 3 4 5% 19%	1650
March	1st to 10th	Day	9% 15% 4 9% 5% 4 4 3 5% 10% 31%	4518
	11th to 20th	Day	12% 22% 5% 7% 4 4 3 2 4 6% 30%	4973
	21st to end	Day	17% 22% 4 10% 6% 5% 6% 3 5% 7% 16%	5519
April	1st to 10th	Day	15% 19% 4 10% 5% 5% 4 4 5% 8% 23%	2409
	11th to 20th	Day	19% 16% 4 7% 4 5% 5% 3 5% 6% 27%	2567
	21st to end	Day	17% 14% 3 8% 5% 4 5% 4 6% 6% 28%	2600
May	1st to 10th	Day	16% 11% 2 6% 4 3 3 3 5% 6% 41%	5880
	11th to 20th	Day	14% 12% 2 8% 5% 6% 6% 4 6% 10% 27%	6356
	21st to end	Day	12% 8% 2 6% 5% 4 4 4 6% 8% 40%	7404
June	1st to 10th	Day	22% 7% 3 6% 5% 4 4 4 5% 7% 34%	3000
	11th to 20th	Day	22% 9% 2 5% 5% 4 5% 4 5% 7% 32%	3000
	21st to end	Day	11% 5% 2 5% 4 4 4 4 6% 7% 48%	3000
July	1st to 10th	Day	4 2 1 4 3 3 4 3 6% 7% 63%	6779
	11th to 20th	Day	5% 2 1 2 2 2 2 2 3 4 76%	6606
	21st to end	Day	4 2 1 2 2 2 2 3 5% 8% 68%	6880
August	1st to 10th	Day	9% 4 2 5% 4 4 4 4 6% 7% 51%	6044
	11th to 20th	Day	4 3 1 3 3 3 4 3 5% 7% 63%	5798
	21st to end	Day	7% 3 1 4 3 3 4 3 5% 6% 61%	6468
September	1st to 10th	Day	9% 3 1 4 3 3 3 3 5% 7% 59%	2392
	11th to 20th	Day	13% 6% 3 5% 3 4 4 4 5% 8% 45%	2200
	21st to end	Day	15% 6% 2 5% 3 4 4 3 6% 8% 45%	2200
October	1st to 10th	Day	11% 5% 1 4 3 3 3 3 4 8% 56%	3507
	11th to 20th	Day	17% 9% 2 5% 3 3 4 3 4 7% 42%	3093
	21st to end	Day	22% 14% 2 6% 4 3 4 4 5% 6% 30%	3200
November	1st to 10th	Day	28% 20% 4 7% 3 3 3 3 4 7% 19%	1854
	11th to 20th	Day	24% 20% 5% 8% 4 4 4 4 5% 7% 15%	1690
	21st to end	Day	21% 24% 4 7% 4 4 4 4 5% 8% 16%	1554
December	1st to 10th	Day	15% 22% 5% 6% 3 3 2 3 4 5% 32%	2360
	11th to 20th	Day	19% 30% 6% 9% 5% 4 3 3 4 6% 11%	2715
	21st to end	Day	16% 25% 7% 9% 4 4 5% 6% 6% 8% 11%	3575
January	1st to 10th	Night	17% 31% 9% 11% 4 5% 4 3 3 4 9%	6898
	11th to 20th	Night	14% 17% 8% 12% 4 4 4 4 8% 8% 18%	6460
	21st to end	Night	14% 22% 6% 7% 4 3 3 3 4 7% 28%	7106
February	1st to 10th	Night	22% 25% 6% 9% 4 3 3 3 3 4 18%	2710
	11th to 20th	Night	19% 27% 5% 8% 4 3 3 3 3 4 21%	2497
	21st to end	Night	14% 28% 8% 9% 5% 4 3 2 3 5% 19%	1980
March	1st to 10th	Night	10% 16% 5% 8% 4 4 4 3 5% 8% 33%	5376
	11th to 20th	Night	12% 20% 5% 7% 5% 4 3 3 4 5% 32%	5027
	21st to end	Night	21% 25% 5% 9% 5% 4 4 4 5% 6% 12%	5452
April	1st to 10th	Night	16% 22% 4 6% 4 3 3 3 5% 7% 27%	1990
	11th to 20th	Night	20% 16% 4 8% 4 4 5% 3 4 4 28%	1781
	21st to end	Night	18% 13% 3 7% 5% 5% 5% 3 5% 5% 32%	1800
May	1st to 10th	Night	20% 11% 2 6% 3 3 3 3 5% 6% 39%	4100
	11th to 20th	Night	19% 9% 3 7% 5% 5% 5% 4 6% 7% 31%	3538
	21st to end	Night	17% 9% 2 6% 4 5% 4 3 5% 6% 38%	3470
June	1st to 10th	Night	21% 7% 2 6% 4 4 4 3 5% 6% 37%	1400
	11th to 20th	Night	25% 7% 2 6% 4 4 4 4 6% 6% 33%	1400
	21st to end	Night	11% 5% 1 3 3 3 4 5% 5% 8% 52%	1400
July	1st to 10th	Night	5% 2 1 3 2 2 2 2 4 5% 72%	3180
	11th to 20th	Night	4 2 1 2 2 2 2 2 3 4 76%	3336
	21st to end	Night	4 3 1 3 2 3 3 3 5% 6% 67%	3970
August	1st to 10th	Night	10% 4 2 4 3 3 4 3 6% 7% 54%	3756
	11th to 20th	Night	4 2 1 4 3 4 4 3 6% 8% 61%	4051
	21st to end	Night	5% 4 2 4 3 3 3 3 5% 6% 63%	4509
September	1st to 10th	Night	8% 4 1 3 3 3 4 3 6% 8% 57%	2005
	11th to 20th	Night	13% 5% 2 5% 3 3 4 3 6% 7% 48%	2200
	21st to end	Night	14% 5% 2 5% 3 3 4 3 4 7% 50%	2200
October	1st to 10th	Night	15% 6% 2 5% 3 3 3 3 4 6% 50%	3689
	11th to 20th	Night	14% 8% 2 4 3 3 4 3 6% 7% 46%	4051
	21st to end	Night	17% 15% 2 5% 3 3 4 3 4 7% 37%	4600
November	1st to 10th	Night	28% 19% 3 5% 3 4 4 3 4 6% 21%	2665
	11th to 20th	Night	24% 21% 4 7% 4 3 3 3 4 8% 19%	2908
	21st to end	Night	21% 20% 4 7% 6% 4 3 3 4 8% 21%	3063
December	1st to 10th	Night	14% 23% 4 5% 3 3 3 3 5% 8% 31%	5040
	11th to 20th	Night	18% 26% 6% 9% 5% 4 4 3 5% 8% 14%	5696
	21st to end	Night	16% 26% 5% 9% 5% 5% 7% 4 5% 8% 10%	7623

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	83% 5% 8% 4	3296
	11th to 20th	Day	65% 4 17% 12% 2	3720
	21st to end	Day	59% 6% 15% 17% 3	4092
February	1st to 10th	Day	75% 3 11% 7% 4	1688
	11th to 20th	Day	69% 6% 13% 9% 3	1797
	21st to end	Day	69% 5% 10% 12% 4	1650
March	1st to 10th	Day	49% 3 14% 19% 14%	4518
	11th to 20th	Day	57% 3 17% 20% 2	4973
	21st to end	Day	68% 5% 13% 11% 2	5519
April	1st to 10th	Day	60% 5% 15% 17% 2	2409
	11th to 20th	Day	58% 4 13% 20% 6%	2570
	21st to end	Day	56% 5% 15% 19% 6% 1	2600
May	1st to 10th	Day	46% 2 13% 23% 15% 1	5880
	11th to 20th	Day	51% 5% 18% 20% 7%	6359
	21st to end	Day	40% 5% 19% 26% 9%	7406
June	1st to 10th	Day	50% 6% 17% 19% 7% 1	3000
	11th to 20th	Day	51% 5% 14% 18% 10% 2	3000
	21st to end	Day	33% 5% 17% 28% 15% 1	3000
July	1st to 10th	Day	22% 2 9% 23% 29% 15%	6706
	11th to 20th	Day	15% 2 5% 27% 21% 30%	6525
	21st to end	Day	16% 1 8% 29% 32% 13%	6681
August	1st to 10th	Day	25% 2 8% 29% 26% 9%	4402
	11th to 20th	Day	23% 3 12% 39% 20% 3	4197
	21st to end	Day	25% 3 9% 37% 23% 3	4663
September	1st to 10th	Day	25% 3 14% 32% 18% 8%	2392
	11th to 20th	Day	37% 5% 14% 28% 13% 2	2200
	21st to end	Day	37% 5% 19% 26% 11% 2	2200
October	1st to 10th	Day	30% 3 16% 37% 14%	3507
	11th to 20th	Day	44% 2 20% 26% 9%	3093
	21st to end	Day	56% 3 15% 21% 5%	3200
November	1st to 10th	Day	67% 5% 15% 10% 3	1854
	11th to 20th	Day	68% 4 15% 9% 3	1690
	21st to end	Day	66% 6% 15% 10% 3	1554
December	1st to 10th	Day	57% 6% 22% 14% 2	2360
	11th to 20th	Day	76% 4 14% 5% 1	2714
	21st to end	Day	69% 9% 11% 10% 1	3575
January	1st to 10th	Night	79% 6% 9% 6%	6898
	11th to 20th	Night	64% 6% 16% 7% 5% 2	6460
	21st to end	Night	60% 6% 14% 16% 4	7106
February	1st to 10th	Night	71% 4 11% 9% 4 1	2710
	11th to 20th	Night	69% 4 12% 11% 3	2498
	21st to end	Night	69% 4 9% 13% 3 1	1980
March	1st to 10th	Night	49% 4 14% 18% 13% 2	5376
	11th to 20th	Night	56% 3 15% 23% 3	5027
	21st to end	Night	73% 5% 11% 10% 2	5452
April	1st to 10th	Night	57% 6% 15% 19% 4	1990
	11th to 20th	Night	59% 5% 11% 18% 7% 1	1781
	21st to end	Night	53% 4 16% 19% 7% 1	1800
May	1st to 10th	Night	47% 3 10% 22% 16% 1	4097
	11th to 20th	Night	52% 4 13% 21% 10%	3538
	21st to end	Night	46% 4 12% 25% 12%	3470
June	1st to 10th	Night	48% 5% 16% 22% 9%	1400
	11th to 20th	Night	51% 5% 13% 21% 9% 2	1400
	21st to end	Night	30% 5% 15% 31% 18% 2	1400
July	1st to 10th	Night	17% 2 8% 29% 25% 19%	3145
	11th to 20th	Night	16% 2 5% 29% 18% 31%	3294
	21st to end	Night	20% 1 9% 23% 26% 20%	3857
August	1st to 10th	Night	21% 2 7% 32% 25% 12%	2727
	11th to 20th	Night	26% 3 12% 33% 22% 5%	2928
	21st to end	Night	22% 3 8% 40% 23% 5%	3245
September	1st to 10th	Night	25% 4 12% 29% 21% 10%	2005
	11th to 20th	Night	35% 4 12% 29% 18% 3	2200
	21st to end	Night	35% 4 19% 25% 16% 3	2200
October	1st to 10th	Night	37% 3 11% 30% 17% 1	3689
	11th to 20th	Night	38% 3 19% 25% 13%	4051
	21st to end	Night	49% 3 14% 25% 8% 1	4600
November	1st to 10th	Night	64% 5% 15% 11% 4	2665
	11th to 20th	Night	65% 6% 16% 10% 2	2908
	21st to end	Night	63% 6% 18% 11% 3	3063
December	1st to 10th	Night	55% 5% 21% 17% 2	5040
	11th to 20th	Night	72% 4 17% 6% 1	5697
	21st to end	Night	72% 9% 12% 8% 1	7623

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	34% 10% 16% 21% 14% 5%	220
	11th to 20th	Day	28% 10% 25% 24% 10% 5%	220
	21st to end	Day	26% 9% 22% 28% 13% 2	242
February	1st to 10th	Day	33% 11% 27% 20% 6% 1	245
	11th to 20th	Day	26% 12% 23% 25% 12% 2	333
	21st to end	Day	27% 15% 22% 23% 10% 2	414
March	1st to 10th	Day	26% 12% 23% 26% 11% 2	500
	11th to 20th	Day	25% 11% 21% 20% 20% 3	500
	21st to end	Day	26% 12% 26% 25% 10% 1	550
April	1st to 10th	Day	23% 14% 28% 22% 11% 2	500
	11th to 20th	Day	26% 15% 25% 20% 12% 2	492
	21st to end	Day	20% 12% 26% 25% 12% 4	500
May	1st to 10th	Day	17% 10% 23% 26% 19% 4	503
	11th to 20th	Day	22% 7% 19% 27% 19% 6%	601
	21st to end	Day	23% 7% 17% 25% 23% 6%	789
June	1st to 10th	Day	21% 8% 18% 27% 18% 7%	730
	11th to 20th	Day	25% 11% 26% 24% 13% 2	730
	21st to end	Day	13% 6% 22% 28% 26% 5%	730
July	1st to 10th	Day	4 4 21% 35% 31% 5%	721
	11th to 20th	Day	7% 7% 22% 37% 24% 4	648
	21st to end	Day	3 4 25% 35% 25% 8%	575
August	1st to 10th	Day	8% 6% 19% 35% 24% 8%	527
	11th to 20th	Day	7% 3 23% 32% 26% 9%	517
	21st to end	Day	9% 8% 20% 33% 22% 7%	583
September	1st to 10th	Day	10% 5% 25% 28% 25% 6%	530
	11th to 20th	Day	14% 8% 23% 26% 21% 8%	530
	21st to end	Day	20% 7% 22% 25% 22% 4	530
October	1st to 10th	Day	18% 7% 25% 28% 16% 5%	476
	11th to 20th	Day	29% 5% 20% 24% 15% 6%	330
	21st to end	Day	32% 8% 26% 20% 11% 3	363
November	1st to 10th	Day	42% 10% 18% 22% 8%	330
	11th to 20th	Day	36% 8% 20% 23% 11% 2	330
	21st to end	Day	35% 7% 22% 21% 14% 1	264
December	1st to 10th	Day	39% 7% 19% 16% 16% 3	220
	11th to 20th	Day	41% 9% 18% 24% 7% 1	220
	21st to end	Day	29% 9% 26% 26% 9% 2	242
January	1st to 10th	Night	35% 10% 17% 26% 10% 2	1045
	11th to 20th	Night	30% 10% 18% 29% 12% 2	840
	21st to end	Night	30% 8% 19% 33% 9% 1	924
February	1st to 10th	Night	33% 8% 19% 29% 10% 1	800
	11th to 20th	Night	34% 10% 19% 26% 10% 1	784
	21st to end	Night	26% 13% 21% 28% 11% 1	660
March	1st to 10th	Night	29% 8% 20% 32% 11% 1	800
	11th to 20th	Night	25% 9% 18% 31% 15% 1	800
	21st to end	Night	30% 7% 19% 31% 11% 1	880
April	1st to 10th	Night	27% 8% 20% 31% 13% 1	790
	11th to 20th	Night	26% 7% 23% 32% 11%	593
	21st to end	Night	23% 8% 19% 34% 16% 1	600
May	1st to 10th	Night	21% 6% 16% 37% 18% 2	600
	11th to 20th	Night	14% 4 15% 39% 25% 4	442
	21st to end	Night	25% 3 12% 31% 27% 2	433
June	1st to 10th	Night	23% 4 14% 36% 19% 4	400
	11th to 20th	Night	28% 4 16% 34% 17% 2	400
	21st to end	Night	14% 3 11% 40% 30% 4	400
July	1st to 10th	Night	6% 1 11% 46% 35% 1	390
	11th to 20th	Night	6% 2 11% 54% 27% 1	388
	21st to end	Night	5% 1 11% 48% 33% 2	438
August	1st to 10th	Night	6% 4 10% 40% 38% 2	472
	11th to 20th	Night	5% 2 10% 43% 36% 5%	594
	21st to end	Night	9% 3 12% 42% 31% 2	660
September	1st to 10th	Night	10% 2 10% 44% 30% 3	765
	11th to 20th	Night	14% 3 9% 38% 31% 5%	800
	21st to end	Night	17% 4 14% 38% 23% 4	800
October	1st to 10th	Night	22% 4 16% 39% 18% 2	800
	11th to 20th	Night	24% 5% 14% 36% 19% 4	800
	21st to end	Night	30% 6% 23% 26% 14% 2	880
November	1st to 10th	Night	38% 7% 17% 30% 8%	820
	11th to 20th	Night	36% 9% 18% 27% 10%	1018
	21st to end	Night	30% 7% 18% 30% 14% 1	1050
December	1st to 10th	Night	32% 8% 16% 28% 14% 2	1050
	11th to 20th	Night	36% 8% 19% 28% 9%	1050
	21st to end	Night	35% 10% 19% 28% 8%	1155

Page generated at 2026-01-28 23:21:40. Version ac07

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