South Bootlegger Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the South Bootlegger Campground clear sky chart from 2005-11-06 to 2024-12-02.

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	7% 7% 2 6% 4 4 5% 4 6% 8% 47%	105701
	Night	7% 8% 3 7% 5% 4 5% 4 6% 8% 44%	102582
Transparency	Day	34% 7% 14% 25% 16% 5%	105427
	Night	37% 7% 14% 25% 14% 3	102448
Seeing	Day	11% 8% 25% 29% 21% 7%	15570
	Night	11% 7% 31% 35% 15% 2	24894

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	4 10% 5% 10% 7% 5% 5% 4 7% 8% 34%	2219
	11th to 20th	Day	5% 11% 5% 10% 6% 7% 7% 5% 6% 7% 31%	2260
	21st to end	Day	3 7% 3 9% 5% 4 5% 4 6% 7% 47%	2830
February	1st to 10th	Day	8% 11% 4 10% 8% 6% 6% 4 6% 8% 29%	1710
	11th to 20th	Day	6% 14% 4 11% 8% 6% 6% 4 5% 7% 29%	1665
	21st to end	Day	5% 11% 4 12% 6% 5% 5% 5% 6% 7% 33%	1456
March	1st to 10th	Day	3 9% 3 8% 6% 7% 5% 4 7% 11% 37%	3285
	11th to 20th	Day	4 6% 3 7% 6% 5% 5% 4 7% 8% 46%	3490
	21st to end	Day	12% 16% 6% 13% 7% 5% 4 3 6% 6% 24%	3825
April	1st to 10th	Day	9% 11% 3 9% 6% 5% 4 5% 6% 8% 33%	2270
	11th to 20th	Day	10% 12% 3 8% 5% 5% 5% 5% 5% 7% 35%	2437
	21st to end	Day	13% 8% 2 7% 5% 5% 5% 4 5% 8% 39%	2470
May	1st to 10th	Day	19% 11% 3 7% 4 4 4 3 5% 7% 32%	4224
	11th to 20th	Day	8% 6% 2 7% 5% 5% 6% 5% 7% 8% 40%	4405
	21st to end	Day	15% 7% 2 7% 4 5% 6% 5% 7% 8% 36%	5161
June	1st to 10th	Day	12% 5% 2 6% 4 4 5% 4 6% 8% 43%	2850
	11th to 20th	Day	14% 5% 2 5% 6% 4 5% 4 5% 8% 41%	2850
	21st to end	Day	6% 3 1 3 3 3 4 4 7% 9% 56%	2850
July	1st to 10th	Day	4 2 1 3 3 3 4 4 7% 8% 61%	4740
	11th to 20th	Day	2 2 1 3 2 3 3 3 4 7% 72%	4740
	21st to end	Day	2 1 1 2 2 2 3 3 5% 6% 73%	5014
August	1st to 10th	Day	7% 3 2 4 3 2 4 4 6% 8% 55%	4092
	11th to 20th	Day	4 3 1 4 4 4 5% 4 6% 9% 57%	4028
	21st to end	Day	5% 3 1 3 3 3 4 3 6% 7% 62%	4521
September	1st to 10th	Day	9% 3 1 4 3 3 3 2 5% 7% 59%	2332
	11th to 20th	Day	10% 6% 2 5% 4 3 4 3 4 8% 50%	2095
	21st to end	Day	11% 5% 2 4 2 3 3 3 5% 7% 54%	2090
October	1st to 10th	Day	8% 5% 1 5% 3 4 4 3 6% 9% 53%	3215
	11th to 20th	Day	5% 5% 1 4 4 4 4 4 6% 8% 54%	3150
	21st to end	Day	5% 7% 3 6% 4 4 5% 4 6% 7% 47%	3147
November	1st to 10th	Day	10% 13% 3 8% 4 4 4 4 6% 8% 36%	1601
	11th to 20th	Day	4 8% 3 8% 7% 6% 5% 4 8% 9% 38%	1600
	21st to end	Day	5% 12% 3 7% 5% 5% 6% 4 6% 9% 38%	1600
December	1st to 10th	Day	5% 9% 4 10% 6% 7% 6% 5% 6% 8% 35%	1352
	11th to 20th	Day	5% 10% 4 10% 6% 6% 5% 4 7% 8% 37%	1685
	21st to end	Day	5% 9% 3 7% 5% 4 5% 5% 6% 8% 44%	2442
January	1st to 10th	Night	4 8% 3 8% 6% 6% 6% 5% 7% 10% 36%	4726
	11th to 20th	Night	5% 12% 4 10% 6% 7% 6% 4 5% 7% 34%	4731
	21st to end	Night	5% 8% 4 9% 5% 5% 5% 4 5% 8% 43%	4827
February	1st to 10th	Night	8% 13% 5% 11% 6% 5% 4 4 5% 7% 32%	2470
	11th to 20th	Night	6% 13% 5% 10% 6% 5% 7% 5% 6% 7% 31%	2402
	21st to end	Night	4 11% 4 10% 7% 5% 6% 4 6% 7% 35%	1995
March	1st to 10th	Night	4 8% 4 9% 7% 6% 7% 5% 7% 8% 34%	3588
	11th to 20th	Night	4 5% 2 6% 4 4 6% 4 6% 8% 51%	3490
	21st to end	Night	13% 17% 6% 13% 6% 5% 5% 3 5% 6% 22%	3828
April	1st to 10th	Night	9% 10% 3 7% 6% 5% 5% 4 6% 7% 36%	1908
	11th to 20th	Night	11% 10% 4 7% 6% 4 5% 4 6% 7% 34%	1691
	21st to end	Night	11% 8% 2 6% 5% 6% 5% 4 7% 7% 39%	1710
May	1st to 10th	Night	17% 11% 4 7% 5% 4 4 5% 5% 6% 33%	2744
	11th to 20th	Night	8% 5% 2 6% 5% 5% 7% 6% 8% 8% 41%	2497
	21st to end	Night	16% 7% 3 7% 5% 5% 5% 4 6% 8% 35%	2414
June	1st to 10th	Night	12% 6% 2 4 4 4 5% 5% 7% 9% 42%	1330
	11th to 20th	Night	14% 6% 2 4 5% 5% 3 5% 5% 7% 44%	1330
	21st to end	Night	7% 2 1 5% 4 2 4 3 6% 8% 58%	1330
July	1st to 10th	Night	3 2 1 3 3 4 4 4 7% 8% 60%	2220
	11th to 20th	Night	2 2 1 2 2 2 3 2 4 7% 74%	2220
	21st to end	Night	4 2 1 2 3 2 3 2 4 5% 72%	2520
August	1st to 10th	Night	7% 3 2 4 3 3 4 4 6% 8% 55%	2847
	11th to 20th	Night	4 3 2 4 4 4 5% 4 9% 11% 50%	2811
	21st to end	Night	9% 5% 1 4 3 4 3 3 4 6% 58%	3146
September	1st to 10th	Night	11% 4 1 5% 3 3 3 3 5% 6% 57%	1847
	11th to 20th	Night	12% 5% 2 5% 3 3 3 4 6% 7% 51%	2082
	21st to end	Night	10% 4 1 4 3 4 4 4 4 6% 53%	2090
October	1st to 10th	Night	8% 6% 2 5% 3 3 3 2 4 6% 58%	3755
	11th to 20th	Night	7% 5% 2 5% 4 3 4 4 5% 8% 53%	3778
	21st to end	Night	5% 6% 2 5% 4 4 4 3 7% 8% 52%	4396
November	1st to 10th	Night	10% 11% 3 7% 4 5% 4 3 6% 8% 38%	2678
	11th to 20th	Night	5% 8% 3 7% 5% 5% 5% 4 7% 9% 42%	2800
	21st to end	Night	6% 10% 4 7% 5% 5% 4 4 6% 8% 41%	2800
December	1st to 10th	Night	4 9% 4 10% 7% 6% 6% 4 6% 8% 35%	2861
	11th to 20th	Night	6% 9% 4 9% 5% 5% 5% 4 6% 8% 40%	3506
	21st to end	Night	4 8% 3 6% 5% 5% 5% 4 6% 7% 46%	5214

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	45% 7% 17% 24% 5% 1	2219
	11th to 20th	Day	51% 7% 15% 14% 12% 1	2260
	21st to end	Day	35% 9% 24% 26% 6%	2830
February	1st to 10th	Day	52% 8% 17% 16% 8%	1710
	11th to 20th	Day	54% 7% 15% 17% 7% 1	1674
	21st to end	Day	48% 9% 14% 19% 9% 1	1456
March	1st to 10th	Day	38% 8% 16% 25% 13%	3285
	11th to 20th	Day	32% 10% 25% 26% 8%	3490
	21st to end	Day	61% 9% 12% 13% 5%	3825
April	1st to 10th	Day	47% 8% 16% 20% 9% 1	2270
	11th to 20th	Day	48% 7% 13% 21% 10% 1	2440
	21st to end	Day	42% 7% 15% 25% 10% 1	2470
May	1st to 10th	Day	50% 6% 13% 23% 7% 1	4224
	11th to 20th	Day	36% 9% 15% 26% 13% 2	4409
	21st to end	Day	41% 10% 15% 24% 10% 1	5162
June	1st to 10th	Day	38% 7% 17% 25% 12% 1	2850
	11th to 20th	Day	41% 8% 12% 19% 16% 4	2850
	21st to end	Day	22% 7% 15% 35% 18% 3	2850
July	1st to 10th	Day	19% 4 12% 30% 23% 11%	4666
	11th to 20th	Day	13% 4 6% 21% 35% 20%	4659
	21st to end	Day	12% 3 6% 21% 32% 25%	4855
August	1st to 10th	Day	25% 5% 12% 24% 25% 9%	4078
	11th to 20th	Day	23% 5% 13% 35% 20% 4	4067
	21st to end	Day	21% 3 9% 31% 29% 6%	4520
September	1st to 10th	Day	26% 4 12% 27% 20% 11%	2332
	11th to 20th	Day	34% 6% 12% 27% 16% 5%	2095
	21st to end	Day	29% 5% 12% 29% 19% 6%	2090
October	1st to 10th	Day	29% 5% 11% 34% 18% 4	3215
	11th to 20th	Day	27% 5% 16% 32% 18% 2	3150
	21st to end	Day	34% 7% 11% 30% 16% 2	3147
November	1st to 10th	Day	46% 7% 15% 21% 9% 3	1601
	11th to 20th	Day	40% 8% 18% 24% 9% 1	1600
	21st to end	Day	40% 8% 20% 21% 9% 1	1600
December	1st to 10th	Day	45% 8% 17% 21% 8% 1	1352
	11th to 20th	Day	42% 9% 24% 19% 4 1	1684
	21st to end	Day	35% 8% 17% 21% 15% 4	2442
January	1st to 10th	Night	40% 10% 18% 24% 7% 1	4726
	11th to 20th	Night	50% 6% 14% 16% 12% 2	4731
	21st to end	Night	38% 8% 19% 27% 8%	4827
February	1st to 10th	Night	51% 7% 15% 17% 9% 1	2470
	11th to 20th	Night	49% 8% 16% 18% 8%	2403
	21st to end	Night	46% 8% 15% 20% 10% 2	1995
March	1st to 10th	Night	41% 9% 15% 25% 9%	3588
	11th to 20th	Night	28% 9% 23% 30% 9%	3490
	21st to end	Night	62% 9% 13% 12% 4	3828
April	1st to 10th	Night	45% 8% 14% 24% 8%	1908
	11th to 20th	Night	47% 6% 12% 23% 11% 1	1691
	21st to end	Night	41% 8% 14% 27% 9% 1	1710
May	1st to 10th	Night	49% 8% 11% 23% 8% 1	2744
	11th to 20th	Night	31% 13% 15% 27% 13% 1	2498
	21st to end	Night	43% 10% 13% 24% 9% 1	2414
June	1st to 10th	Night	37% 8% 17% 25% 11% 1	1330
	11th to 20th	Night	38% 7% 13% 24% 15% 3	1330
	21st to end	Night	25% 6% 14% 33% 19% 3	1330
July	1st to 10th	Night	20% 5% 11% 31% 27% 6%	2185
	11th to 20th	Night	13% 3 6% 28% 32% 19%	2178
	21st to end	Night	15% 3 6% 22% 31% 24%	2442
August	1st to 10th	Night	26% 5% 11% 24% 23% 11%	2838
	11th to 20th	Night	26% 4 16% 31% 17% 5%	2838
	21st to end	Night	28% 4 8% 28% 24% 6%	3146
September	1st to 10th	Night	28% 5% 10% 27% 18% 13%	1847
	11th to 20th	Night	31% 6% 12% 28% 17% 6%	2082
	21st to end	Night	31% 6% 11% 28% 19% 5%	2090
October	1st to 10th	Night	29% 3 9% 34% 19% 5%	3755
	11th to 20th	Night	30% 5% 13% 31% 20% 2	3778
	21st to end	Night	29% 6% 12% 33% 18% 2	4396
November	1st to 10th	Night	43% 7% 16% 21% 10% 3	2678
	11th to 20th	Night	37% 8% 18% 24% 12% 1	2800
	21st to end	Night	40% 7% 21% 21% 9% 2	2800
December	1st to 10th	Night	45% 8% 16% 21% 8% 2	2861
	11th to 20th	Night	40% 9% 23% 23% 4 1	3507
	21st to end	Night	35% 7% 14% 25% 15% 5%	5214

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	9% 5% 29% 28% 18% 11%	180
	11th to 20th	Day	13% 4 28% 27% 20% 9%	180
	21st to end	Day	7% 7% 27% 36% 21% 1	209
February	1st to 10th	Day	15% 10% 27% 37% 9% 2	270
	11th to 20th	Day	11% 9% 31% 32% 13% 5%	270
	21st to end	Day	5% 10% 32% 36% 13% 4	268
March	1st to 10th	Day	12% 10% 31% 28% 15% 4	460
	11th to 20th	Day	8% 11% 28% 30% 16% 7%	460
	21st to end	Day	11% 9% 31% 26% 15% 8%	506
April	1st to 10th	Day	13% 13% 28% 30% 13% 2	460
	11th to 20th	Day	15% 14% 28% 27% 13% 3	452
	21st to end	Day	18% 8% 28% 24% 18% 3	460
May	1st to 10th	Day	13% 9% 21% 30% 19% 8%	525
	11th to 20th	Day	17% 5% 21% 25% 23% 8%	675
	21st to end	Day	18% 9% 16% 24% 24% 9%	734
June	1st to 10th	Day	12% 9% 25% 25% 22% 6%	680
	11th to 20th	Day	15% 11% 32% 23% 16% 3	680
	21st to end	Day	8% 5% 22% 33% 25% 7%	680
July	1st to 10th	Day	5% 4 19% 33% 30% 9%	671
	11th to 20th	Day	4 4 22% 40% 25% 5%	668
	21st to end	Day	3 2 17% 38% 30% 10%	680
August	1st to 10th	Day	8% 3 18% 34% 27% 9%	487
	11th to 20th	Day	6% 4 13% 30% 34% 13%	477
	21st to end	Day	5% 5% 21% 30% 27% 11%	539
September	1st to 10th	Day	10% 5% 21% 29% 26% 9%	490
	11th to 20th	Day	12% 8% 20% 26% 24% 10%	490
	21st to end	Day	15% 8% 23% 28% 19% 7%	490
October	1st to 10th	Day	16% 5% 20% 28% 22% 9%	332
	11th to 20th	Day	9% 7% 30% 27% 20% 7%	300
	21st to end	Day	12% 11% 37% 25% 12% 3	330
November	1st to 10th	Day	20% 7% 26% 30% 13% 3	300
	11th to 20th	Day	8% 12% 35% 31% 12% 2	300
	21st to end	Day	6% 9% 37% 32% 14% 3	300
December	1st to 10th	Day	8% 8% 41% 21% 18% 4	189
	11th to 20th	Day	13% 9% 39% 19% 18% 2	180
	21st to end	Day	12% 5% 24% 33% 20% 6%	198
January	1st to 10th	Night	9% 9% 36% 34% 11% 1	950
	11th to 20th	Night	11% 9% 36% 32% 10% 2	941
	21st to end	Night	8% 9% 38% 32% 11% 2	836
February	1st to 10th	Night	14% 11% 29% 33% 11% 3	760
	11th to 20th	Night	11% 8% 35% 34% 10% 1	744
	21st to end	Night	7% 9% 30% 33% 18% 2	628
March	1st to 10th	Night	8% 6% 35% 35% 14% 2	760
	11th to 20th	Night	9% 7% 29% 38% 14% 2	760
	21st to end	Night	14% 6% 33% 32% 13% 2	836
April	1st to 10th	Night	13% 8% 33% 33% 12% 1	640
	11th to 20th	Night	16% 8% 30% 34% 11%	563
	21st to end	Night	15% 8% 29% 33% 14% 1	570
May	1st to 10th	Night	16% 7% 24% 33% 19% 1	570
	11th to 20th	Night	11% 6% 24% 38% 19% 2	554
	21st to end	Night	19% 6% 22% 30% 20% 4	411
June	1st to 10th	Night	14% 7% 27% 32% 18% 2	380
	11th to 20th	Night	15% 11% 32% 29% 12% 1	380
	21st to end	Night	8% 3 24% 43% 20% 1	380
July	1st to 10th	Night	4 2 24% 47% 22% 1	370
	11th to 20th	Night	6% 4 22% 50% 17% 1	368
	21st to end	Night	5% 3 24% 49% 19%	419
August	1st to 10th	Night	4 3 23% 48% 21% 1	567
	11th to 20th	Night	6% 4 21% 43% 24% 1	564
	21st to end	Night	9% 5% 21% 42% 22% 1	627
September	1st to 10th	Night	13% 2 22% 39% 22% 2	570
	11th to 20th	Night	15% 2 23% 35% 23% 2	752
	21st to end	Night	13% 5% 26% 32% 20% 4	760
October	1st to 10th	Night	16% 3 25% 36% 18% 2	760
	11th to 20th	Night	10% 9% 29% 33% 16% 2	760
	21st to end	Night	11% 9% 36% 31% 12%	836
November	1st to 10th	Night	16% 8% 34% 33% 8% 1	923
	11th to 20th	Night	10% 12% 39% 28% 10% 1	1000
	21st to end	Night	10% 8% 35% 38% 10%	1000
December	1st to 10th	Night	8% 9% 36% 33% 12% 2	960
	11th to 20th	Night	9% 8% 36% 33% 12% 1	950
	21st to end	Night	11% 9% 33% 33% 12% 1	1045

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