Little Levels Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Little Levels Campground clear sky chart from 2005-11-06 to 2026-02-16.

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	12% 6% 2 6% 4 4 4 4 6% 8% 43%	130710
	Night	13% 7% 2 6% 4 4 4 3 5% 7% 43%	130133
Transparency	Day	38% 5% 13% 24% 16% 3	134284
	Night	40% 4 11% 24% 18% 4	134629
Seeing	Day	15% 5% 20% 31% 23% 6%	16799
	Night	17% 7% 24% 32% 18% 3	26283

By Month

Percentage Cloud Cover SE (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	12% 4 2 5% 3 3 4 3 5% 7% 51%	4661
	11th to 20th	Day	13% 6% 2 7% 4 4 3 3 4 5% 51%	5080
	21st to end	Day	11% 8% 3 7% 4 4 4 4 5% 6% 43%	5780
February	1st to 10th	Day	13% 8% 3 7% 4 4 5% 4 7% 8% 39%	1904
	11th to 20th	Day	19% 8% 2 4 4 3 4 3 4 7% 43%	1998
	21st to end	Day	16% 9% 2 6% 4 3 4 4 4 7% 40%	1650
March	1st to 10th	Day	17% 5% 2 6% 4 4 4 3 5% 7% 43%	4515
	11th to 20th	Day	9% 7% 3 6% 3 3 3 3 5% 6% 51%	4980
	21st to end	Day	14% 7% 2 5% 4 4 4 3 5% 7% 44%	5784
April	1st to 10th	Day	14% 7% 2 7% 4 4 3 4 5% 7% 45%	2400
	11th to 20th	Day	11% 6% 2 5% 4 4 5% 3 5% 8% 48%	2374
	21st to end	Day	13% 6% 2 6% 3 3 4 4 6% 8% 44%	2400
May	1st to 10th	Day	14% 9% 4 9% 5% 4 5% 4 6% 8% 32%	5538
	11th to 20th	Day	17% 9% 3 7% 5% 4 4 4 6% 8% 33%	6178
	21st to end	Day	14% 6% 3 8% 5% 4 5% 4 6% 9% 37%	6934
June	1st to 10th	Day	11% 5% 2 6% 4 5% 5% 5% 8% 10% 42%	2800
	11th to 20th	Day	11% 5% 2 6% 4 4 4 3 6% 10% 45%	2800
	21st to end	Day	6% 4 2 5% 4 5% 5% 4 7% 12% 47%	2800
July	1st to 10th	Day	7% 5% 2 5% 4 4 4 4 7% 10% 48%	6360
	11th to 20th	Day	9% 6% 3 7% 5% 5% 6% 5% 9% 11% 32%	6360
	21st to end	Day	6% 4 2 6% 4 5% 6% 5% 8% 11% 43%	6569
August	1st to 10th	Day	12% 8% 2 7% 4 5% 5% 4 7% 11% 35%	4121
	11th to 20th	Day	8% 5% 2 7% 6% 5% 5% 5% 6% 9% 42%	3850
	21st to end	Day	8% 4 2 5% 4 4 4 4 7% 10% 48%	4312
September	1st to 10th	Day	13% 5% 2 4 4 4 5% 4 6% 7% 46%	2400
	11th to 20th	Day	11% 6% 2 7% 4 4 5% 4 5% 7% 46%	2360
	21st to end	Day	18% 8% 3 7% 4 4 3 3 5% 7% 37%	2200
October	1st to 10th	Day	14% 5% 2 4 4 4 5% 3 6% 7% 47%	2023
	11th to 20th	Day	17% 5% 2 5% 2 3 4 3 4 5% 50%	2000
	21st to end	Day	13% 5% 2 5% 4 4 4 3 5% 7% 48%	2176
November	1st to 10th	Day	13% 5% 2 5% 4 3 4 3 5% 7% 48%	1851
	11th to 20th	Day	11% 6% 2 5% 5% 4 5% 3 5% 7% 46%	1890
	21st to end	Day	15% 5% 2 6% 3 4 3 3 5% 6% 48%	1864
December	1st to 10th	Day	10% 6% 2 5% 3 4 4 3 5% 6% 51%	2680
	11th to 20th	Day	16% 9% 3 7% 3 3 3 2 3 5% 45%	3070
	21st to end	Day	11% 6% 2 5% 3 4 4 4 6% 8% 48%	4048
January	1st to 10th	Night	11% 7% 2 4 3 4 4 4 6% 7% 48%	8233
	11th to 20th	Night	13% 7% 2 6% 3 3 3 2 3 5% 53%	7878
	21st to end	Night	14% 7% 2 6% 4 4 4 3 4 6% 47%	8401
February	1st to 10th	Night	16% 9% 2 6% 4 3 4 4 6% 5% 43%	2714
	11th to 20th	Night	20% 7% 2 4 4 3 4 3 5% 6% 42%	2399
	21st to end	Night	18% 7% 2 5% 3 3 3 3 5% 5% 45%	1980
March	1st to 10th	Night	18% 7% 2 5% 4 3 3 3 4 5% 45%	5333
	11th to 20th	Night	12% 9% 3 5% 3 3 3 3 5% 7% 46%	4980
	21st to end	Night	15% 9% 2 6% 4 4 4 3 5% 6% 44%	5147
April	1st to 10th	Night	16% 9% 3 6% 4 3 4 4 5% 6% 38%	2000
	11th to 20th	Night	12% 7% 2 4 4 4 4 3 5% 6% 48%	1975
	21st to end	Night	14% 7% 2 6% 4 4 4 4 6% 8% 41%	2000
May	1st to 10th	Night	14% 9% 4 9% 5% 5% 4 4 7% 8% 31%	4356
	11th to 20th	Night	20% 9% 3 8% 4 4 4 3 6% 8% 31%	3744
	21st to end	Night	16% 9% 4 9% 4 4 4 4 5% 7% 33%	3920
June	1st to 10th	Night	14% 8% 2 7% 5% 4 4 4 6% 7% 41%	1600
	11th to 20th	Night	9% 7% 2 6% 6% 5% 6% 4 7% 10% 39%	1600
	21st to end	Night	7% 6% 2 5% 5% 4 5% 5% 7% 11% 41%	1600
July	1st to 10th	Night	8% 6% 2 7% 6% 5% 6% 5% 8% 12% 34%	3598
	11th to 20th	Night	8% 7% 3 9% 6% 6% 6% 6% 8% 11% 31%	3597
	21st to end	Night	10% 7% 2 7% 5% 5% 5% 4 7% 11% 37%	4278
August	1st to 10th	Night	14% 9% 4 8% 5% 5% 5% 4 5% 10% 32%	2981
	11th to 20th	Night	10% 6% 3 7% 5% 4 5% 4 6% 9% 41%	3197
	21st to end	Night	8% 5% 2 5% 4 4 4 3 5% 8% 52%	3586
September	1st to 10th	Night	13% 6% 3 6% 4 4 4 4 6% 8% 44%	2000
	11th to 20th	Night	10% 6% 2 6% 4 4 5% 3 5% 8% 46%	2039
	21st to end	Night	20% 7% 3 6% 5% 4 4 4 5% 7% 34%	2200
October	1st to 10th	Night	15% 6% 2 5% 4 4 4 3 5% 7% 45%	2373
	11th to 20th	Night	18% 5% 2 5% 4 2 4 3 3 6% 49%	2400
	21st to end	Night	14% 6% 2 6% 4 4 4 3 4 7% 48%	2661
November	1st to 10th	Night	14% 6% 2 5% 3 4 4 3 4 7% 49%	2667
	11th to 20th	Night	14% 7% 2 6% 4 4 4 3 5% 5% 47%	2730
	21st to end	Night	11% 6% 2 5% 4 3 4 3 5% 7% 50%	2751
December	1st to 10th	Night	10% 5% 2 5% 3 3 4 4 5% 7% 51%	4720
	11th to 20th	Night	18% 7% 3 7% 5% 4 5% 3 4 7% 37%	5345
	21st to end	Night	12% 7% 3 7% 5% 4 4 3 5% 7% 43%	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	34% 3 8% 28% 23% 4	4662
	11th to 20th	Day	37% 2 6% 21% 26% 7%	5080
	21st to end	Day	43% 3 8% 31% 14% 2	5780
February	1st to 10th	Day	42% 5% 13% 25% 14% 3	1904
	11th to 20th	Day	43% 4 8% 24% 17% 4	2007
	21st to end	Day	44% 4 11% 22% 15% 4	1650
March	1st to 10th	Day	41% 3 9% 20% 21% 7%	4515
	11th to 20th	Day	35% 4 9% 27% 20% 6%	4980
	21st to end	Day	41% 4 11% 18% 19% 8%	5784
April	1st to 10th	Day	39% 5% 12% 21% 18% 5%	2400
	11th to 20th	Day	35% 5% 12% 24% 19% 5%	2374
	21st to end	Day	38% 5% 13% 23% 18% 4	2400
May	1st to 10th	Day	50% 6% 15% 19% 9% 1	5570
	11th to 20th	Day	49% 6% 13% 22% 9% 1	6182
	21st to end	Day	42% 6% 14% 23% 14% 1	6949
June	1st to 10th	Day	35% 8% 16% 25% 15% 2	2800
	11th to 20th	Day	34% 7% 17% 27% 13% 2	2800
	21st to end	Day	30% 8% 17% 29% 15% 1	2800
July	1st to 10th	Day	31% 7% 24% 23% 13% 2	6290
	11th to 20th	Day	43% 9% 23% 20% 4	6285
	21st to end	Day	33% 8% 18% 22% 18% 1	6381
August	1st to 10th	Day	42% 6% 21% 24% 7%	4108
	11th to 20th	Day	38% 6% 16% 30% 10%	3886
	21st to end	Day	30% 6% 13% 31% 18% 2	4312
September	1st to 10th	Day	36% 7% 16% 21% 16% 3	2400
	11th to 20th	Day	37% 4 11% 25% 20% 2	2360
	21st to end	Day	47% 5% 9% 20% 15% 3	2200
October	1st to 10th	Day	31% 4 9% 29% 23% 5%	3296
	11th to 20th	Day	29% 3 6% 26% 28% 7%	3240
	21st to end	Day	26% 3 11% 28% 23% 9%	3490
November	1st to 10th	Day	36% 4 9% 30% 16% 4	1851
	11th to 20th	Day	38% 4 11% 22% 20% 5%	1890
	21st to end	Day	38% 4 9% 30% 16% 4	1864
December	1st to 10th	Day	34% 4 13% 28% 17% 3	2680
	11th to 20th	Day	44% 2 12% 23% 16% 3	3066
	21st to end	Day	36% 4 16% 27% 16% 1	4048
January	1st to 10th	Night	35% 3 11% 24% 22% 5%	8234
	11th to 20th	Night	37% 3 5% 25% 23% 7%	7878
	21st to end	Night	40% 3 8% 29% 17% 3	8401
February	1st to 10th	Night	43% 4 11% 24% 16% 2	2714
	11th to 20th	Night	44% 4 7% 22% 19% 4	2401
	21st to end	Night	42% 3 8% 23% 19% 5%	1980
March	1st to 10th	Night	41% 3 8% 22% 17% 8%	5333
	11th to 20th	Night	38% 4 8% 23% 21% 6%	4980
	21st to end	Night	43% 3 9% 20% 18% 7%	5147
April	1st to 10th	Night	44% 5% 9% 19% 17% 5%	2000
	11th to 20th	Night	37% 5% 11% 21% 21% 6%	1975
	21st to end	Night	40% 5% 11% 21% 19% 4	2000
May	1st to 10th	Night	50% 5% 15% 21% 8% 2	4386
	11th to 20th	Night	51% 5% 12% 20% 11% 1	3745
	21st to end	Night	49% 5% 12% 20% 12% 1	3927
June	1st to 10th	Night	43% 6% 12% 22% 16% 1	1600
	11th to 20th	Night	39% 7% 15% 24% 14% 2	1600
	21st to end	Night	35% 8% 15% 25% 15% 2	1600
July	1st to 10th	Night	41% 8% 18% 18% 13% 1	3560
	11th to 20th	Night	45% 9% 20% 20% 5%	3552
	21st to end	Night	40% 6% 16% 22% 16%	4152
August	1st to 10th	Night	49% 6% 16% 23% 7%	2970
	11th to 20th	Night	40% 6% 15% 27% 12%	3227
	21st to end	Night	30% 5% 11% 27% 25% 1	3586
September	1st to 10th	Night	38% 6% 16% 20% 16% 4	2000
	11th to 20th	Night	37% 5% 10% 26% 20% 2	2039
	21st to end	Night	48% 7% 10% 18% 15% 2	2200
October	1st to 10th	Night	35% 4 9% 24% 26% 3	3880
	11th to 20th	Night	28% 2 8% 26% 30% 6%	3899
	21st to end	Night	25% 2 9% 31% 24% 9%	4297
November	1st to 10th	Night	37% 4 9% 26% 19% 5%	2667
	11th to 20th	Night	40% 4 10% 21% 19% 5%	2730
	21st to end	Night	34% 3 12% 27% 21% 3	2751
December	1st to 10th	Night	33% 4 13% 26% 21% 3	4720
	11th to 20th	Night	48% 4 11% 20% 14% 4	5348
	21st to end	Night	41% 3 15% 24% 16% 1	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	19% 13% 31% 29% 8%	220
	11th to 20th	Day	15% 14% 38% 25% 8%	294
	21st to end	Day	16% 8% 32% 36% 7%	363
February	1st to 10th	Day	16% 9% 32% 34% 8%	344
	11th to 20th	Day	25% 11% 39% 20% 5%	516
	21st to end	Day	20% 10% 36% 25% 8%	414
March	1st to 10th	Day	18% 9% 32% 33% 8%	500
	11th to 20th	Day	18% 9% 28% 36% 8% 2	500
	21st to end	Day	16% 8% 32% 35% 8% 1	550
April	1st to 10th	Day	16% 10% 31% 30% 11% 1	500
	11th to 20th	Day	13% 5% 25% 40% 16% 2	492
	21st to end	Day	16% 3 24% 37% 19% 1	500
May	1st to 10th	Day	16% 5% 22% 39% 16% 2	503
	11th to 20th	Day	19% 2 18% 37% 20% 3	527
	21st to end	Day	18% 1 12% 31% 28% 9%	573
June	1st to 10th	Day	13% 3 12% 34% 32% 7%	530
	11th to 20th	Day	12% 2 10% 31% 37% 8%	530
	21st to end	Day	8% 1 8% 37% 36% 9%	530
July	1st to 10th	Day	10% 2 6% 27% 42% 12%	525
	11th to 20th	Day	6% 1 3 30% 48% 12%	524
	21st to end	Day	9% 2 7% 32% 41% 9%	576
August	1st to 10th	Day	11% 1 7% 33% 38% 10%	526
	11th to 20th	Day	11% 1 6% 26% 44% 12%	519
	21st to end	Day	9% 1 9% 29% 37% 16%	583
September	1st to 10th	Day	15% 2 11% 28% 29% 15%	530
	11th to 20th	Day	13% 3 9% 31% 35% 10%	530
	21st to end	Day	24% 5% 15% 29% 23% 5%	530
October	1st to 10th	Day	19% 2 13% 28% 28% 10%	530
	11th to 20th	Day	17% 5% 19% 32% 22% 4	530
	21st to end	Day	15% 8% 24% 28% 19% 6%	569
November	1st to 10th	Day	16% 8% 24% 27% 21% 4	425
	11th to 20th	Day	14% 10% 32% 29% 14% 1	430
	21st to end	Day	18% 12% 25% 26% 16% 3	404
December	1st to 10th	Day	19% 8% 33% 28% 11% 1	220
	11th to 20th	Day	20% 7% 30% 30% 13%	220
	21st to end	Day	17% 6% 29% 32% 16% 1	242
January	1st to 10th	Night	18% 16% 35% 25% 6%	840
	11th to 20th	Night	19% 13% 34% 28% 6%	840
	21st to end	Night	18% 13% 36% 30% 4	924
February	1st to 10th	Night	20% 11% 34% 30% 5%	840
	11th to 20th	Night	23% 12% 39% 24% 2	804
	21st to end	Night	21% 11% 31% 32% 5%	660
March	1st to 10th	Night	19% 10% 33% 30% 8% 1	800
	11th to 20th	Night	20% 9% 30% 31% 8% 2	800
	21st to end	Night	20% 7% 30% 35% 8% 1	880
April	1st to 10th	Night	20% 7% 35% 29% 8% 1	800
	11th to 20th	Night	14% 5% 29% 38% 13% 1	791
	21st to end	Night	18% 4 24% 39% 14% 1	800
May	1st to 10th	Night	18% 6% 22% 41% 13% 1	744
	11th to 20th	Night	18% 3 21% 39% 17% 1	472
	21st to end	Night	18% 2 11% 33% 28% 8%	433
June	1st to 10th	Night	16% 4 11% 43% 26% 2	400
	11th to 20th	Night	10% 3 10% 38% 34% 6%	400
	21st to end	Night	8% 2 10% 40% 37% 5%	400
July	1st to 10th	Night	9% 2 8% 35% 39% 8%	390
	11th to 20th	Night	6% 2 5% 29% 46% 11%	388
	21st to end	Night	9% 2 7% 35% 40% 7%	586
August	1st to 10th	Night	10% 1 6% 35% 41% 6%	637
	11th to 20th	Night	11% 2 8% 32% 39% 8%	790
	21st to end	Night	11% 1 7% 33% 37% 11%	880
September	1st to 10th	Night	13% 2 10% 30% 35% 10%	800
	11th to 20th	Night	12% 3 10% 31% 38% 8%	800
	21st to end	Night	23% 3 15% 31% 25% 4	800
October	1st to 10th	Night	18% 4 18% 28% 23% 10%	800
	11th to 20th	Night	20% 5% 22% 32% 20% 2	800
	21st to end	Night	16% 9% 25% 30% 17% 3	880
November	1st to 10th	Night	17% 8% 23% 31% 17% 5%	820
	11th to 20th	Night	18% 10% 28% 32% 10% 1	840
	21st to end	Night	14% 13% 27% 30% 14% 1	840
December	1st to 10th	Night	20% 10% 34% 22% 11% 2	840
	11th to 20th	Night	19% 10% 36% 27% 7%	840
	21st to end	Night	18% 10% 32% 32% 8%	924

Page generated at 2026-02-13 01:42:17. Version ac07

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