Jeff Busby Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Jeff Busby Campground clear sky chart from 2005-11-06 to 2024-06-30.

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	12% 7% 2 6% 5% 5% 5% 4 6% 7% 42%	89415
	Night	13% 7% 2 6% 4 4 4 3 5% 7% 46%	89680
Transparency	Day	40% 6% 10% 21% 18% 5%	89189
	Night	38% 5% 9% 20% 21% 7%	89513
Seeing	Day	15% 9% 23% 24% 19% 9%	14574
	Night	15% 8% 24% 29% 20% 4	24357

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% 14% 3 5% 3 4 2 3 4 6% 41%	2701
	11th to 20th	Day	17% 9% 3 6% 3 3 3 2 4 5% 44%	2850
	21st to end	Day	19% 11% 3 5% 3 3 3 3 3 5% 43%	3318
February	1st to 10th	Day	16% 8% 2 7% 5% 3 4 4 5% 6% 40%	1900
	11th to 20th	Day	22% 8% 3 6% 4 4 3 2 3 5% 39%	1848
	21st to end	Day	20% 9% 2 7% 5% 3 3 2 4 5% 39%	1570
March	1st to 10th	Day	21% 11% 3 7% 5% 4 5% 4 5% 5% 31%	3120
	11th to 20th	Day	14% 8% 3 6% 4 4 4 4 7% 8% 39%	3432
	21st to end	Day	13% 8% 3 7% 5% 6% 5% 4 4 5% 40%	4101
April	1st to 10th	Day	13% 5% 2 6% 4 4 4 3 5% 7% 46%	2280
	11th to 20th	Day	15% 7% 2 5% 4 4 4 4 5% 5% 45%	2254
	21st to end	Day	9% 5% 2 5% 5% 4 5% 3 6% 7% 49%	2280
May	1st to 10th	Day	11% 5% 2 6% 5% 5% 5% 5% 6% 9% 42%	3765
	11th to 20th	Day	12% 6% 2 6% 5% 4 5% 4 6% 8% 41%	3948
	21st to end	Day	9% 6% 2 7% 5% 6% 6% 5% 7% 9% 39%	4476
June	1st to 10th	Day	8% 6% 2 7% 6% 6% 6% 5% 7% 9% 38%	2580
	11th to 20th	Day	4 4 2 7% 6% 5% 7% 4 7% 10% 44%	2660
	21st to end	Day	6% 4 2 6% 5% 6% 6% 5% 7% 9% 43%	2647
July	1st to 10th	Day	8% 6% 3 8% 6% 6% 8% 6% 8% 9% 33%	2520
	11th to 20th	Day	8% 6% 2 7% 7% 7% 7% 6% 8% 10% 32%	2376
	21st to end	Day	7% 6% 2 7% 6% 7% 8% 7% 8% 10% 33%	2412
August	1st to 10th	Day	5% 5% 2 6% 6% 7% 8% 6% 9% 9% 38%	2148
	11th to 20th	Day	8% 6% 3 8% 6% 7% 7% 6% 7% 9% 33%	2125
	21st to end	Day	13% 5% 2 5% 5% 5% 6% 5% 7% 11% 38%	2376
September	1st to 10th	Day	8% 6% 2 6% 5% 6% 5% 4 6% 8% 44%	2160
	11th to 20th	Day	11% 5% 3 8% 4 4 4 4 5% 7% 44%	2066
	21st to end	Day	11% 5% 2 4 4 3 3 3 5% 7% 52%	1980
October	1st to 10th	Day	7% 5% 2 5% 4 3 4 3 4 5% 58%	1954
	11th to 20th	Day	11% 4 2 5% 4 3 4 3 5% 7% 54%	1800
	21st to end	Day	14% 5% 2 5% 3 4 3 3 4 5% 53%	1980
November	1st to 10th	Day	10% 5% 2 5% 3 3 3 3 3 6% 58%	1722
	11th to 20th	Day	13% 6% 2 5% 3 3 3 2 4 5% 54%	1710
	21st to end	Day	15% 8% 3 6% 3 3 4 3 4 6% 45%	1710
December	1st to 10th	Day	17% 9% 3 6% 5% 4 4 3 4 6% 40%	1710
	11th to 20th	Day	15% 9% 3 7% 4 5% 3 3 4 5% 43%	2153
	21st to end	Day	12% 8% 3 8% 5% 4 5% 3 5% 6% 41%	2783
January	1st to 10th	Night	18% 10% 2 5% 3 3 3 3 4 6% 42%	4236
	11th to 20th	Night	16% 10% 4 7% 3 3 2 2 3 4 46%	4120
	21st to end	Night	22% 12% 2 5% 3 3 2 2 3 3 43%	4339
February	1st to 10th	Night	17% 10% 3 7% 4 3 4 3 5% 6% 40%	2280
	11th to 20th	Night	21% 7% 2 6% 4 4 3 3 4 3 44%	2218
	21st to end	Night	20% 8% 3 6% 4 4 3 3 4 6% 38%	1884
March	1st to 10th	Night	20% 12% 3 6% 4 3 3 3 4 7% 34%	3733
	11th to 20th	Night	13% 7% 2 5% 4 3 4 3 6% 7% 45%	3556
	21st to end	Night	17% 7% 3 6% 5% 4 4 3 5% 5% 40%	3530
April	1st to 10th	Night	12% 7% 1 5% 5% 3 4 4 5% 7% 48%	1900
	11th to 20th	Night	13% 5% 2 5% 3 4 4 3 5% 7% 48%	1875
	21st to end	Night	9% 5% 2 6% 4 4 3 4 5% 8% 50%	1900
May	1st to 10th	Night	11% 6% 2 6% 4 4 4 3 6% 9% 45%	3130
	11th to 20th	Night	15% 6% 2 5% 4 4 4 4 6% 7% 44%	2940
	21st to end	Night	7% 5% 2 7% 4 6% 6% 5% 7% 9% 42%	3079
June	1st to 10th	Night	5% 4 2 6% 6% 6% 5% 5% 7% 9% 45%	1593
	11th to 20th	Night	4 3 1 4 3 3 5% 5% 7% 11% 53%	1520
	21st to end	Night	5% 3 1 5% 4 4 4 4 8% 10% 51%	1512
July	1st to 10th	Night	3 4 2 6% 5% 4 6% 5% 9% 12% 43%	1440
	11th to 20th	Night	5% 4 2 5% 4 6% 5% 5% 8% 10% 47%	1579
	21st to end	Night	4 4 2 6% 5% 5% 6% 5% 10% 12% 44%	1902
August	1st to 10th	Night	3 2 2 4 4 5% 6% 5% 9% 12% 47%	1790
	11th to 20th	Night	5% 4 2 6% 5% 4 5% 5% 8% 12% 44%	1776
	21st to end	Night	9% 4 1 6% 5% 5% 5% 4 7% 8% 46%	1980
September	1st to 10th	Night	9% 5% 1 5% 5% 4 4 3 5% 8% 51%	1800
	11th to 20th	Night	9% 5% 1 5% 4 4 5% 4 6% 8% 47%	1876
	21st to end	Night	8% 4 1 4 3 4 4 4 5% 7% 55%	1980
October	1st to 10th	Night	7% 3 2 3 3 3 2 4 5% 6% 62%	2002
	11th to 20th	Night	12% 6% 1 5% 3 3 3 3 5% 6% 54%	2160
	21st to end	Night	16% 7% 2 3 2 3 3 2 3 4 55%	2376
November	1st to 10th	Night	11% 5% 2 4 3 3 3 2 4 5% 58%	2356
	11th to 20th	Night	12% 5% 2 4 3 4 3 3 5% 6% 54%	2470
	21st to end	Night	15% 5% 2 5% 4 3 3 3 4 6% 49%	2470
December	1st to 10th	Night	18% 8% 3 6% 3 3 4 3 4 6% 43%	2470
	11th to 20th	Night	14% 7% 3 6% 4 4 3 3 4 5% 48%	3042
	21st to end	Night	15% 10% 3 7% 4 4 5% 4 6% 6% 35%	4866

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% 3 5% 20% 23% 4	2702
	11th to 20th	Day	44% 4 5% 22% 22% 3	2850
	21st to end	Day	46% 3 7% 16% 21% 7%	3318
February	1st to 10th	Day	45% 4 8% 19% 18% 7%	1900
	11th to 20th	Day	49% 3 4 18% 18% 8%	1858
	21st to end	Day	49% 3 6% 14% 20% 8%	1570
March	1st to 10th	Day	55% 4 7% 11% 16% 8%	3120
	11th to 20th	Day	42% 6% 7% 21% 18% 6%	3432
	21st to end	Day	46% 4 7% 19% 18% 5%	4101
April	1st to 10th	Day	38% 4 9% 21% 20% 7%	2280
	11th to 20th	Day	41% 4 6% 18% 24% 7%	2254
	21st to end	Day	35% 4 10% 25% 24% 3	2280
May	1st to 10th	Day	37% 6% 11% 30% 14% 3	3800
	11th to 20th	Day	40% 6% 11% 28% 15% 1	3952
	21st to end	Day	40% 7% 13% 27% 11% 1	4489
June	1st to 10th	Day	40% 8% 14% 20% 17% 2	2580
	11th to 20th	Day	33% 7% 14% 24% 19% 3	2660
	21st to end	Day	35% 8% 15% 22% 16% 4	2647
July	1st to 10th	Day	42% 10% 18% 20% 8% 3	2451
	11th to 20th	Day	42% 10% 20% 18% 8% 2	2305
	21st to end	Day	40% 12% 19% 20% 8% 1	2278
August	1st to 10th	Day	36% 11% 17% 27% 9% 1	2136
	11th to 20th	Day	43% 11% 14% 18% 11% 3	2125
	21st to end	Day	38% 9% 17% 20% 11% 5%	2376
September	1st to 10th	Day	37% 7% 12% 21% 19% 5%	2160
	11th to 20th	Day	39% 6% 11% 16% 22% 7%	2066
	21st to end	Day	32% 5% 9% 24% 21% 9%	1980
October	1st to 10th	Day	28% 5% 10% 24% 24% 10%	1954
	11th to 20th	Day	31% 5% 5% 20% 30% 9%	1800
	21st to end	Day	35% 3 5% 19% 28% 10%	1980
November	1st to 10th	Day	31% 3 6% 21% 29% 11%	1722
	11th to 20th	Day	35% 2 6% 19% 25% 12%	1710
	21st to end	Day	41% 4 5% 17% 24% 8%	1710
December	1st to 10th	Day	46% 5% 8% 16% 19% 7%	1710
	11th to 20th	Day	44% 3 6% 18% 23% 6%	2150
	21st to end	Day	43% 4 7% 19% 24% 3	2783
January	1st to 10th	Night	44% 3 5% 16% 28% 4	4236
	11th to 20th	Night	44% 3 4 21% 19% 9%	4120
	21st to end	Night	48% 2 3 19% 23% 5%	4339
February	1st to 10th	Night	46% 3 6% 18% 20% 8%	2280
	11th to 20th	Night	46% 3 4 18% 18% 10%	2219
	21st to end	Night	49% 4 6% 14% 18% 10%	1884
March	1st to 10th	Night	52% 3 7% 13% 16% 9%	3733
	11th to 20th	Night	38% 5% 8% 19% 19% 10%	3556
	21st to end	Night	45% 4 7% 19% 21% 4	3530
April	1st to 10th	Night	36% 5% 9% 21% 20% 9%	1900
	11th to 20th	Night	36% 4 7% 20% 25% 9%	1875
	21st to end	Night	33% 3 10% 25% 23% 5%	1900
May	1st to 10th	Night	37% 5% 12% 24% 19% 3	3160
	11th to 20th	Night	39% 5% 11% 28% 15% 1	2941
	21st to end	Night	36% 7% 13% 26% 15% 3	3087
June	1st to 10th	Night	35% 7% 14% 22% 20% 2	1593
	11th to 20th	Night	23% 7% 16% 30% 17% 7%	1520
	21st to end	Night	27% 7% 18% 23% 21% 3	1512
July	1st to 10th	Night	28% 12% 20% 26% 11% 4	1400
	11th to 20th	Night	27% 11% 25% 26% 9% 3	1528
	21st to end	Night	28% 10% 24% 26% 10% 2	1796
August	1st to 10th	Night	25% 10% 22% 31% 11% 1	1778
	11th to 20th	Night	30% 10% 21% 23% 11% 4	1776
	21st to end	Night	34% 9% 17% 22% 12% 5%	1980
September	1st to 10th	Night	31% 6% 13% 23% 22% 5%	1800
	11th to 20th	Night	33% 8% 11% 17% 22% 8%	1876
	21st to end	Night	28% 6% 8% 25% 23% 10%	1980
October	1st to 10th	Night	23% 4 9% 24% 26% 14%	2002
	11th to 20th	Night	32% 4 6% 19% 29% 11%	2160
	21st to end	Night	36% 2 5% 17% 29% 13%	2376
November	1st to 10th	Night	30% 4 7% 19% 28% 13%	2356
	11th to 20th	Night	32% 3 7% 18% 26% 13%	2470
	21st to end	Night	37% 3 7% 20% 22% 10%	2470
December	1st to 10th	Night	44% 4 8% 18% 21% 6%	2470
	11th to 20th	Night	40% 3 7% 17% 27% 6%	3044
	21st to end	Night	47% 5% 6% 16% 23% 3	4866

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	25% 23% 34% 16% 3	270
	11th to 20th	Day	27% 21% 33% 13% 4 2	270
	21st to end	Day	25% 25% 34% 12% 2 1	297
February	1st to 10th	Day	25% 20% 36% 14% 6%	270
	11th to 20th	Day	37% 19% 32% 9% 3	270
	21st to end	Day	36% 22% 33% 8% 1	225
March	1st to 10th	Day	24% 22% 33% 17% 4	270
	11th to 20th	Day	22% 25% 39% 11% 3	270
	21st to end	Day	21% 18% 36% 18% 7%	468
April	1st to 10th	Day	22% 17% 32% 20% 8% 1	460
	11th to 20th	Day	24% 15% 30% 19% 10% 2	452
	21st to end	Day	17% 13% 30% 27% 13% 1	460
May	1st to 10th	Day	18% 10% 27% 31% 13% 3	463
	11th to 20th	Day	10% 9% 28% 32% 15% 7%	487
	21st to end	Day	9% 5% 27% 28% 20% 12%	529
June	1st to 10th	Day	10% 5% 20% 30% 26% 10%	600
	11th to 20th	Day	5% 3 19% 31% 30% 12%	680
	21st to end	Day	8% 3 15% 34% 26% 14%	676
July	1st to 10th	Day	7% 2 12% 31% 32% 16%	621
	11th to 20th	Day	7% 2 9% 24% 37% 21%	618
	21st to end	Day	6% 2 10% 26% 37% 19%	550
August	1st to 10th	Day	5% 1 12% 25% 33% 23%	446
	11th to 20th	Day	10% 1 10% 27% 34% 18%	439
	21st to end	Day	15% 2 7% 24% 31% 20%	495
September	1st to 10th	Day	9% 2 10% 32% 36% 12%	450
	11th to 20th	Day	10% 3 12% 26% 33% 16%	450
	21st to end	Day	13% 2 14% 30% 30% 11%	450
October	1st to 10th	Day	9% 4 23% 30% 25% 9%	424
	11th to 20th	Day	10% 12% 34% 30% 11% 3	270
	21st to end	Day	21% 12% 30% 25% 10% 2	297
November	1st to 10th	Day	17% 8% 29% 30% 13% 4	270
	11th to 20th	Day	14% 16% 39% 25% 7% 1	270
	21st to end	Day	17% 16% 36% 19% 10% 2	270
December	1st to 10th	Day	26% 19% 33% 18% 3 1	270
	11th to 20th	Day	21% 17% 37% 16% 9%	270
	21st to end	Day	27% 15% 40% 14% 3 1	297
January	1st to 10th	Night	24% 15% 35% 22% 4	950
	11th to 20th	Night	23% 17% 29% 24% 7%	950
	21st to end	Night	24% 15% 38% 20% 3	930
February	1st to 10th	Night	23% 15% 33% 24% 5%	760
	11th to 20th	Night	26% 16% 32% 22% 4	743
	21st to end	Night	26% 18% 34% 21% 2	628
March	1st to 10th	Night	19% 17% 30% 29% 5%	760
	11th to 20th	Night	18% 13% 37% 25% 7% 1	620
	21st to end	Night	16% 14% 33% 26% 10%	627
April	1st to 10th	Night	16% 13% 33% 27% 10% 1	570
	11th to 20th	Night	16% 13% 29% 28% 12% 2	563
	21st to end	Night	12% 10% 35% 30% 11% 1	570
May	1st to 10th	Night	13% 5% 29% 36% 16% 2	570
	11th to 20th	Night	11% 4 25% 34% 22% 3	561
	21st to end	Night	6% 2 20% 37% 29% 6%	617
June	1st to 10th	Night	6% 1 13% 38% 33% 8%	570
	11th to 20th	Night	6% 1 11% 32% 40% 11%	570
	21st to end	Night	7% 1 11% 33% 38% 11%	567
July	1st to 10th	Night	2 1 10% 27% 45% 15%	525
	11th to 20th	Night	5% 2 7% 29% 37% 20%	522
	21st to end	Night	4 1 7% 27% 46% 15%	591
August	1st to 10th	Night	4 1 4 26% 47% 17%	537
	11th to 20th	Night	7% 5% 31% 45% 12%	534
	21st to end	Night	9% 2 6% 25% 44% 13%	594
September	1st to 10th	Night	9% 2 11% 31% 41% 7%	540
	11th to 20th	Night	12% 2 13% 27% 39% 7%	616
	21st to end	Night	10% 1 15% 33% 37% 5%	720
October	1st to 10th	Night	8% 3 19% 33% 31% 6%	720
	11th to 20th	Night	14% 7% 21% 38% 18% 2	720
	21st to end	Night	19% 6% 24% 29% 20% 2	792
November	1st to 10th	Night	14% 7% 23% 32% 21% 3	740
	11th to 20th	Night	15% 9% 30% 33% 13% 1	760
	21st to end	Night	19% 9% 29% 29% 12% 2	760
December	1st to 10th	Night	22% 13% 29% 29% 8%	760
	11th to 20th	Night	21% 10% 33% 28% 8%	760
	21st to end	Night	24% 15% 31% 25% 5%	1040

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