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 2024-11-30.

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% 6% 2 6% 4 4 4 4 6% 8% 42%	101325
	Night	14% 7% 2 6% 4 4 4 3 5% 7% 42%	98203
Transparency	Day	38% 5% 14% 25% 15% 3	104943
	Night	41% 5% 11% 24% 17% 3	102724
Seeing	Day	15% 5% 19% 31% 24% 6%	15293
	Night	17% 7% 23% 32% 18% 3	24677

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	15% 6% 2 5% 3 2 3 3 4 7% 50%	2517
	11th to 20th	Day	13% 7% 2 8% 4 4 3 3 5% 7% 43%	2724
	21st to end	Day	13% 11% 4 9% 4 5% 4 3 5% 6% 36%	3124
February	1st to 10th	Day	13% 8% 2 7% 4 4 5% 4 7% 8% 38%	1722
	11th to 20th	Day	18% 7% 2 4 4 3 4 3 4 7% 44%	1848
	21st to end	Day	17% 10% 2 6% 4 3 4 4 4 7% 38%	1570
March	1st to 10th	Day	23% 6% 2 6% 4 4 3 3 4 7% 37%	3141
	11th to 20th	Day	10% 4 1 4 3 3 3 3 6% 8% 55%	3480
	21st to end	Day	18% 9% 3 5% 4 3 4 3 4 6% 41%	4036
April	1st to 10th	Day	13% 6% 2 7% 4 4 3 4 5% 7% 46%	2280
	11th to 20th	Day	11% 6% 1 5% 4 4 5% 3 5% 8% 48%	2254
	21st to end	Day	14% 6% 2 6% 3 3 4 4 6% 8% 44%	2280
May	1st to 10th	Day	15% 10% 4 10% 5% 5% 5% 4 6% 7% 28%	3856
	11th to 20th	Day	19% 10% 3 7% 5% 4 4 4 6% 7% 32%	4300
	21st to end	Day	9% 6% 3 8% 5% 4 5% 4 6% 10% 40%	4823
June	1st to 10th	Day	10% 4 2 6% 4 4 5% 5% 8% 10% 42%	2660
	11th to 20th	Day	10% 5% 2 6% 4 4 4 4 6% 10% 45%	2660
	21st to end	Day	6% 4 2 5% 5% 5% 5% 5% 7% 12% 46%	2660
July	1st to 10th	Day	6% 5% 2 5% 4 4 5% 4 8% 11% 46%	4440
	11th to 20th	Day	9% 6% 2 6% 5% 4 5% 5% 8% 10% 39%	4440
	21st to end	Day	8% 5% 2 7% 5% 6% 6% 5% 9% 10% 36%	4569
August	1st to 10th	Day	11% 8% 2 7% 4 5% 5% 5% 8% 11% 35%	3994
	11th to 20th	Day	8% 5% 2 7% 6% 5% 5% 5% 6% 9% 43%	3730
	21st to end	Day	8% 4 2 5% 4 4 5% 4 7% 10% 48%	4180
September	1st to 10th	Day	13% 6% 2 4 4 4 5% 4 6% 7% 45%	2280
	11th to 20th	Day	10% 6% 2 7% 4 4 5% 4 5% 7% 47%	2242
	21st to end	Day	18% 8% 3 7% 4 4 3 3 5% 7% 38%	2090
October	1st to 10th	Day	15% 5% 2 4 4 4 5% 2 6% 7% 46%	1922
	11th to 20th	Day	17% 5% 2 5% 3 3 4 3 4 5% 50%	1900
	21st to end	Day	13% 5% 2 5% 4 4 4 3 5% 7% 49%	2067
November	1st to 10th	Day	13% 5% 2 5% 4 3 4 3 5% 7% 47%	1761
	11th to 20th	Day	12% 7% 2 5% 5% 4 4 3 5% 7% 46%	1800
	21st to end	Day	15% 5% 2 6% 3 4 3 3 5% 6% 48%	1773
December	1st to 10th	Day	15% 7% 2 6% 4 4 5% 4 7% 7% 40%	1520
	11th to 20th	Day	15% 7% 3 5% 4 3 4 3 4 5% 47%	1910
	21st to end	Day	14% 7% 2 5% 3 4 4 4 6% 7% 44%	2772
January	1st to 10th	Night	13% 7% 2 5% 4 4 4 3 5% 7% 47%	4429
	11th to 20th	Night	17% 8% 3 6% 4 3 3 3 4 6% 44%	4234
	21st to end	Night	16% 10% 3 8% 5% 3 3 3 4 5% 40%	4532
February	1st to 10th	Night	16% 9% 2 6% 4 2 4 4 6% 5% 43%	2456
	11th to 20th	Night	19% 8% 2 4 4 4 4 3 5% 6% 42%	2218
	21st to end	Night	18% 7% 2 5% 3 4 3 3 4 5% 45%	1884
March	1st to 10th	Night	23% 8% 3 6% 4 3 3 3 5% 6% 35%	3707
	11th to 20th	Night	14% 6% 2 5% 3 3 4 3 6% 8% 47%	3480
	21st to end	Night	18% 10% 3 6% 4 3 3 2 4 4 44%	3595
April	1st to 10th	Night	16% 9% 3 6% 4 3 4 4 5% 6% 38%	1900
	11th to 20th	Night	11% 7% 2 4 4 4 4 4 5% 6% 49%	1875
	21st to end	Night	14% 7% 2 6% 4 4 4 4 6% 8% 40%	1900
May	1st to 10th	Night	16% 9% 4 10% 5% 6% 4 4 6% 6% 30%	3038
	11th to 20th	Night	23% 8% 2 7% 5% 4 3 3 6% 8% 31%	2608
	21st to end	Night	11% 9% 4 9% 5% 4 5% 4 6% 9% 36%	2732
June	1st to 10th	Night	14% 8% 2 7% 5% 4 4 4 6% 7% 40%	1520
	11th to 20th	Night	8% 6% 2 5% 6% 5% 6% 4 7% 11% 40%	1520
	21st to end	Night	8% 6% 3 6% 5% 4 5% 5% 7% 11% 40%	1520
July	1st to 10th	Night	8% 7% 3 6% 6% 5% 6% 5% 8% 11% 36%	2520
	11th to 20th	Night	8% 6% 2 7% 5% 5% 6% 5% 7% 10% 38%	2520
	21st to end	Night	13% 9% 3 8% 6% 5% 4 4 7% 9% 32%	2980
August	1st to 10th	Night	13% 9% 3 8% 5% 5% 5% 4 5% 10% 32%	2889
	11th to 20th	Night	9% 6% 3 8% 5% 4 5% 4 6% 9% 41%	3097
	21st to end	Night	8% 5% 2 5% 4 4 4 3 5% 8% 53%	3476
September	1st to 10th	Night	13% 6% 2 6% 4 4 4 4 6% 8% 44%	1900
	11th to 20th	Night	9% 6% 2 7% 4 4 5% 4 5% 7% 46%	1937
	21st to end	Night	20% 7% 3 6% 5% 4 4 4 5% 7% 35%	2090
October	1st to 10th	Night	16% 6% 3 6% 4 4 4 3 5% 7% 44%	2254
	11th to 20th	Night	17% 5% 2 5% 3 3 4 3 3 6% 50%	2280
	21st to end	Night	14% 6% 2 5% 4 4 4 3 4 7% 48%	2528
November	1st to 10th	Night	14% 6% 2 5% 3 4 4 3 4 7% 49%	2537
	11th to 20th	Night	14% 7% 2 6% 4 4 4 3 5% 5% 47%	2600
	21st to end	Night	11% 6% 2 4 4 3 4 3 5% 7% 50%	2618
December	1st to 10th	Night	16% 8% 2 7% 4 3 4 4 5% 6% 39%	2660
	11th to 20th	Night	18% 6% 2 6% 4 4 5% 3 4 7% 41%	3285
	21st to end	Night	13% 7% 2 7% 5% 4 4 4 5% 7% 41%	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	36% 3 7% 32% 19% 2	2518
	11th to 20th	Day	42% 3 10% 21% 20% 4	2724
	21st to end	Day	49% 4 9% 23% 12% 2	3124
February	1st to 10th	Day	42% 5% 13% 25% 13% 2	1722
	11th to 20th	Day	42% 4 8% 25% 17% 5%	1857
	21st to end	Day	46% 4 12% 21% 14% 4	1570
March	1st to 10th	Day	47% 4 9% 20% 16% 4	3141
	11th to 20th	Day	27% 5% 10% 32% 22% 4	3480
	21st to end	Day	45% 4 10% 19% 17% 4	4036
April	1st to 10th	Day	38% 5% 12% 21% 19% 5%	2280
	11th to 20th	Day	34% 5% 12% 25% 19% 5%	2254
	21st to end	Day	38% 5% 13% 23% 17% 4	2280
May	1st to 10th	Day	54% 6% 12% 19% 7% 2	3891
	11th to 20th	Day	51% 6% 14% 19% 8% 2	4304
	21st to end	Day	36% 7% 16% 23% 15% 2	4837
June	1st to 10th	Day	34% 8% 17% 25% 14% 2	2660
	11th to 20th	Day	33% 7% 17% 27% 13% 2	2660
	21st to end	Day	30% 8% 17% 28% 15% 1	2660
July	1st to 10th	Day	32% 8% 26% 21% 11% 2	4370
	11th to 20th	Day	38% 6% 24% 25% 6% 1	4365
	21st to end	Day	39% 10% 19% 20% 13% 1	4423
August	1st to 10th	Day	42% 7% 21% 24% 6%	3981
	11th to 20th	Day	37% 6% 16% 31% 10%	3766
	21st to end	Day	30% 6% 13% 31% 18% 2	4180
September	1st to 10th	Day	36% 7% 17% 20% 17% 4	2280
	11th to 20th	Day	36% 5% 11% 26% 20% 2	2242
	21st to end	Day	47% 5% 9% 21% 16% 3	2090
October	1st to 10th	Day	30% 4 9% 29% 23% 5%	3195
	11th to 20th	Day	29% 3 6% 26% 29% 7%	3140
	21st to end	Day	26% 3 11% 29% 23% 9%	3381
November	1st to 10th	Day	37% 4 10% 29% 16% 4	1761
	11th to 20th	Day	38% 5% 10% 22% 19% 5%	1800
	21st to end	Day	38% 4 9% 29% 17% 4	1773
December	1st to 10th	Day	42% 6% 13% 25% 12% 2	1520
	11th to 20th	Day	40% 3 8% 30% 16% 3	1906
	21st to end	Day	39% 5% 16% 25% 14% 1	2772
January	1st to 10th	Night	38% 4 8% 27% 18% 4	4429
	11th to 20th	Night	44% 4 8% 25% 18% 2	4234
	21st to end	Night	47% 4 6% 25% 15% 2	4532
February	1st to 10th	Night	42% 4 12% 25% 15% 2	2456
	11th to 20th	Night	44% 4 7% 22% 19% 4	2220
	21st to end	Night	43% 3 8% 23% 19% 5%	1884
March	1st to 10th	Night	50% 4 9% 22% 13% 2	3707
	11th to 20th	Night	35% 5% 8% 27% 21% 4	3480
	21st to end	Night	46% 2 7% 22% 17% 6%	3595
April	1st to 10th	Night	44% 5% 9% 19% 18% 5%	1900
	11th to 20th	Night	36% 5% 11% 22% 20% 6%	1875
	21st to end	Night	41% 5% 11% 22% 18% 3	1900
May	1st to 10th	Night	54% 5% 12% 20% 8% 2	3068
	11th to 20th	Night	52% 6% 12% 21% 8% 1	2609
	21st to end	Night	44% 7% 14% 20% 14% 2	2739
June	1st to 10th	Night	43% 6% 12% 22% 16% 1	1520
	11th to 20th	Night	37% 7% 15% 25% 15% 2	1520
	21st to end	Night	36% 8% 15% 24% 15% 2	1520
July	1st to 10th	Night	40% 10% 18% 19% 11% 1	2480
	11th to 20th	Night	39% 7% 21% 26% 7%	2472
	21st to end	Night	47% 6% 17% 18% 12%	2885
August	1st to 10th	Night	49% 6% 16% 22% 7%	2878
	11th to 20th	Night	39% 6% 15% 28% 12%	3127
	21st to end	Night	30% 5% 11% 27% 25% 1	3476
September	1st to 10th	Night	38% 6% 16% 19% 16% 4	1900
	11th to 20th	Night	37% 5% 10% 26% 20% 2	1937
	21st to end	Night	47% 7% 9% 18% 16% 2	2090
October	1st to 10th	Night	35% 4 9% 24% 25% 3	3761
	11th to 20th	Night	27% 2 8% 26% 30% 6%	3779
	21st to end	Night	24% 2 9% 32% 24% 9%	4164
November	1st to 10th	Night	37% 4 9% 26% 19% 5%	2537
	11th to 20th	Night	40% 4 10% 21% 19% 5%	2600
	21st to end	Night	35% 3 12% 26% 21% 3	2618
December	1st to 10th	Night	45% 5% 11% 23% 13% 3	2660
	11th to 20th	Night	43% 4 10% 21% 19% 2	3288
	21st to end	Night	42% 4 15% 26% 12% 1	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	21% 13% 29% 27% 9%	180
	11th to 20th	Day	14% 16% 37% 24% 8%	240
	21st to end	Day	18% 8% 32% 34% 8%	297
February	1st to 10th	Day	16% 9% 30% 35% 9%	282
	11th to 20th	Day	24% 11% 39% 20% 6%	456
	21st to end	Day	21% 10% 37% 24% 7% 1	382
March	1st to 10th	Day	19% 9% 31% 32% 9%	460
	11th to 20th	Day	19% 9% 29% 36% 6% 2	460
	21st to end	Day	17% 9% 30% 34% 9% 1	506
April	1st to 10th	Day	16% 10% 32% 30% 12% 1	460
	11th to 20th	Day	12% 6% 24% 40% 17% 2	452
	21st to end	Day	17% 4 24% 38% 17% 1	460
May	1st to 10th	Day	15% 5% 23% 37% 17% 3	463
	11th to 20th	Day	20% 2 18% 37% 21% 2	487
	21st to end	Day	17% 1 12% 31% 30% 10%	529
June	1st to 10th	Day	12% 2 13% 34% 32% 7%	490
	11th to 20th	Day	11% 1 11% 32% 36% 9%	490
	21st to end	Day	8% 1 9% 40% 36% 7%	490
July	1st to 10th	Day	11% 1 7% 28% 41% 12%	485
	11th to 20th	Day	6% 1 4 31% 49% 10%	484
	21st to end	Day	10% 2 8% 33% 39% 8%	532
August	1st to 10th	Day	11% 1 7% 32% 39% 10%	486
	11th to 20th	Day	10% 1 7% 26% 43% 13%	479
	21st to end	Day	9% 1 9% 27% 37% 16%	539
September	1st to 10th	Day	14% 2 11% 28% 29% 16%	490
	11th to 20th	Day	12% 3 9% 32% 34% 10%	490
	21st to end	Day	23% 6% 16% 29% 23% 4	490
October	1st to 10th	Day	20% 2 13% 28% 28% 8%	490
	11th to 20th	Day	16% 5% 19% 33% 24% 4	490
	21st to end	Day	15% 8% 23% 28% 20% 6%	526
November	1st to 10th	Day	15% 8% 22% 27% 23% 5%	395
	11th to 20th	Day	15% 10% 31% 29% 15% 1	400
	21st to end	Day	18% 13% 24% 25% 16% 3	375
December	1st to 10th	Day	18% 8% 34% 27% 11% 2	180
	11th to 20th	Day	20% 7% 31% 28% 14% 1	180
	21st to end	Day	18% 6% 28% 31% 17% 1	198
January	1st to 10th	Night	18% 16% 34% 26% 6%	760
	11th to 20th	Night	20% 12% 33% 28% 6%	760
	21st to end	Night	19% 13% 34% 30% 4	836
February	1st to 10th	Night	20% 11% 34% 30% 5%	760
	11th to 20th	Night	23% 13% 39% 23% 2	743
	21st to end	Night	21% 11% 31% 32% 5%	628
March	1st to 10th	Night	19% 10% 32% 30% 8% 1	760
	11th to 20th	Night	20% 9% 31% 30% 7% 2	760
	21st to end	Night	20% 8% 29% 34% 8% 1	836
April	1st to 10th	Night	20% 7% 35% 29% 8% 1	760
	11th to 20th	Night	14% 5% 28% 38% 14% 1	751
	21st to end	Night	19% 4 24% 39% 13% 1	760
May	1st to 10th	Night	18% 6% 22% 40% 13% 1	707
	11th to 20th	Night	19% 3 21% 40% 17% 1	448
	21st to end	Night	17% 2 11% 32% 29% 9%	411
June	1st to 10th	Night	16% 4 10% 42% 27% 2	380
	11th to 20th	Night	9% 3 11% 39% 33% 6%	380
	21st to end	Night	8% 1 11% 41% 36% 4	380
July	1st to 10th	Night	9% 2 8% 35% 38% 8%	370
	11th to 20th	Night	6% 2 6% 29% 46% 11%	368
	21st to end	Night	8% 2 8% 36% 40% 6%	556
August	1st to 10th	Night	9% 1 7% 35% 42% 7%	605
	11th to 20th	Night	10% 2 9% 33% 39% 7%	750
	21st to end	Night	11% 1 7% 31% 38% 12%	836
September	1st to 10th	Night	13% 2 9% 29% 35% 11%	760
	11th to 20th	Night	11% 3 10% 31% 37% 8%	760
	21st to end	Night	23% 3 15% 31% 24% 4	760
October	1st to 10th	Night	19% 4 18% 28% 23% 8%	760
	11th to 20th	Night	18% 5% 22% 32% 21% 2	760
	21st to end	Night	16% 9% 24% 30% 18% 3	836
November	1st to 10th	Night	17% 8% 22% 31% 18% 5%	780
	11th to 20th	Night	19% 10% 28% 33% 11% 1	800
	21st to end	Night	14% 13% 27% 30% 15% 1	800
December	1st to 10th	Night	21% 10% 33% 22% 12% 2	760
	11th to 20th	Night	19% 10% 37% 27% 7%	760
	21st to end	Night	18% 10% 32% 32% 8%	836

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