Badlands National Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Badlands National Park clear sky chart from 2005-11-06 to 2024-03-06.

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	8% 6% 2 5% 4 3 4 4 5% 8% 51%	78475
	Night	8% 6% 3 5% 5% 3 4 5% 5% 7% 49%	81099
Transparency	Day	33% 3 14% 29% 17% 4	78179
	Night	35% 3 13% 28% 17% 4	80917
Seeing	Day	12% 6% 26% 33% 18% 5%	14895
	Night	11% 6% 32% 39% 12% 1	25059

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	3 6% 4 9% 8% 3 4 3 6% 7% 47%	2538
	11th to 20th	Day	4 8% 4 10% 6% 4 4 3 4 7% 46%	2540
	21st to end	Day	3 6% 3 7% 5% 3 5% 5% 4 7% 52%	2794
February	1st to 10th	Day	9% 10% 5% 7% 7% 3 6% 4 5% 6% 38%	1681
	11th to 20th	Day	6% 10% 5% 5% 6% 3 4 4 6% 6% 45%	1849
	21st to end	Day	6% 8% 3 7% 5% 3 5% 4 5% 7% 46%	1570
March	1st to 10th	Day	7% 8% 3 6% 4 2 4 5% 5% 7% 49%	1850
	11th to 20th	Day	8% 5% 2 5% 5% 3 5% 3 7% 9% 48%	1869
	21st to end	Day	12% 9% 4 6% 5% 2 5% 5% 6% 8% 38%	2322
April	1st to 10th	Day	13% 8% 3 5% 4 2 4 4 5% 8% 45%	2160
	11th to 20th	Day	15% 7% 3 6% 5% 3 5% 5% 5% 7% 40%	2142
	21st to end	Day	13% 7% 3 4 5% 2 5% 4 5% 9% 43%	2340
May	1st to 10th	Day	13% 6% 2 4 4 3 4 4 6% 8% 45%	2340
	11th to 20th	Day	16% 6% 2 5% 5% 2 4 5% 5% 9% 41%	2424
	21st to end	Day	16% 5% 2 4 4 2 4 5% 6% 9% 42%	2724
June	1st to 10th	Day	9% 4 1 4 4 3 5% 5% 5% 9% 52%	2520
	11th to 20th	Day	8% 3 2 3 4 2 5% 5% 7% 8% 54%	2520
	21st to end	Day	5% 3 1 3 3 3 3 5% 6% 7% 61%	2520
July	1st to 10th	Day	5% 3 1 3 4 3 4 6% 6% 10% 55%	2520
	11th to 20th	Day	5% 2 1 3 2 2 2 3 5% 8% 67%	2520
	21st to end	Day	5% 2 1 3 4 2 4 5% 6% 9% 58%	2742
August	1st to 10th	Day	6% 3 2 5% 5% 3 5% 6% 6% 10% 50%	2454
	11th to 20th	Day	5% 3 1 3 3 2 4 3 5% 7% 63%	2272
	21st to end	Day	6% 3 1 3 3 3 3 4 5% 8% 62%	2376
September	1st to 10th	Day	7% 3 1 4 3 2 3 3 4 7% 63%	2160
	11th to 20th	Day	9% 3 1 3 3 2 3 3 4 6% 62%	2026
	21st to end	Day	11% 3 2 3 2 2 3 3 4 7% 62%	1980
October	1st to 10th	Day	13% 6% 2 5% 4 2 3 3 4 6% 52%	1980
	11th to 20th	Day	11% 5% 2 5% 3 2 4 3 5% 6% 54%	1708
	21st to end	Day	10% 7% 2 3 4 3 4 4 5% 8% 51%	1782
November	1st to 10th	Day	7% 5% 2 5% 3 4 4 5% 6% 6% 54%	1673
	11th to 20th	Day	7% 6% 2 6% 5% 3 4 4 4 6% 53%	1710
	21st to end	Day	5% 9% 3 5% 4 2 3 4 5% 7% 52%	1629
December	1st to 10th	Day	7% 8% 3 6% 6% 3 4 4 6% 8% 47%	1520
	11th to 20th	Day	4 6% 3 5% 3 2 3 5% 6% 8% 53%	1926
	21st to end	Day	11% 14% 2 5% 5% 3 4 4 4 6% 43%	2794
January	1st to 10th	Night	5% 9% 4 8% 7% 3 4 5% 5% 7% 43%	4417
	11th to 20th	Night	4 7% 3 8% 8% 5% 6% 5% 6% 6% 43%	4430
	21st to end	Night	3 7% 3 6% 6% 3 5% 5% 6% 8% 50%	4873
February	1st to 10th	Night	10% 11% 4 7% 6% 3 4 4 5% 6% 40%	2511
	11th to 20th	Night	6% 8% 4 7% 6% 4 5% 6% 6% 5% 42%	2218
	21st to end	Night	7% 8% 3 6% 6% 3 3 4 5% 7% 47%	1884
March	1st to 10th	Night	9% 8% 3 6% 5% 3 4 5% 5% 6% 46%	2226
	11th to 20th	Night	10% 7% 2 4 4 4 4 5% 6% 8% 45%	2090
	21st to end	Night	13% 8% 3 7% 5% 2 5% 4 5% 8% 40%	2033
April	1st to 10th	Night	13% 7% 3 5% 5% 2 5% 6% 4 7% 43%	1800
	11th to 20th	Night	16% 6% 3 5% 6% 4 3 5% 5% 7% 41%	1765
	21st to end	Night	15% 6% 3 4 4 3 4 5% 5% 8% 43%	1620
May	1st to 10th	Night	12% 5% 2 5% 6% 3 5% 6% 5% 8% 42%	1620
	11th to 20th	Night	14% 6% 2 5% 5% 2 4 4 6% 7% 45%	1467
	21st to end	Night	15% 5% 2 5% 6% 3 5% 4 5% 7% 43%	1552
June	1st to 10th	Night	9% 5% 1 3 4 3 4 5% 7% 9% 52%	1440
	11th to 20th	Night	11% 3 2 3 5% 3 4 5% 6% 8% 49%	1440
	21st to end	Night	5% 3 2 4 4 3 4 5% 6% 8% 57%	1440
July	1st to 10th	Night	5% 3 1 3 4 2 5% 6% 6% 9% 55%	1440
	11th to 20th	Night	5% 2 1 3 3 2 2 4 5% 9% 65%	1440
	21st to end	Night	3 3 2 3 4 3 4 5% 6% 8% 59%	1576
August	1st to 10th	Night	4 4 2 4 5% 2 5% 5% 7% 10% 51%	1484
	11th to 20th	Night	4 2 2 3 4 2 4 5% 5% 7% 62%	1626
	21st to end	Night	4 2 1 4 3 2 4 4 6% 7% 63%	1980
September	1st to 10th	Night	8% 3 2 4 3 2 3 3 4 7% 63%	1800
	11th to 20th	Night	8% 2 1 3 3 2 3 4 6% 8% 60%	1934
	21st to end	Night	11% 3 2 3 4 1 3 3 3 6% 61%	1980
October	1st to 10th	Night	14% 5% 2 4 4 2 4 4 5% 6% 49%	1980
	11th to 20th	Night	11% 4 2 4 3 2 4 4 5% 6% 55%	2230
	21st to end	Night	11% 6% 2 3 3 2 4 4 5% 7% 53%	2574
November	1st to 10th	Night	7% 5% 2 5% 5% 3 4 5% 6% 8% 49%	2405
	11th to 20th	Night	7% 7% 3 6% 6% 3 4 4 5% 5% 51%	2470
	21st to end	Night	6% 7% 2 4 4 2 4 5% 5% 8% 52%	2550
December	1st to 10th	Night	7% 9% 3 6% 4 3 5% 4 5% 6% 49%	2660
	11th to 20th	Night	4 6% 3 5% 5% 3 5% 5% 6% 7% 51%	3271
	21st to end	Night	13% 10% 3 5% 4 2 4 5% 5% 7% 43%	4873

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	38% 2 17% 31% 11%	2539
	11th to 20th	Day	40% 5% 17% 25% 10% 3	2540
	21st to end	Day	34% 3 21% 29% 13% 1	2794
February	1st to 10th	Day	48% 3 12% 22% 13% 2	1681
	11th to 20th	Day	40% 3 17% 22% 13% 5%	1859
	21st to end	Day	38% 3 13% 28% 14% 3	1570
March	1st to 10th	Day	35% 4 15% 29% 14% 3	1850
	11th to 20th	Day	34% 3 14% 32% 16% 2	1869
	21st to end	Day	44% 5% 15% 25% 11% 1	2322
April	1st to 10th	Day	39% 4 15% 29% 10% 3	2160
	11th to 20th	Day	43% 4 13% 24% 14% 2	2145
	21st to end	Day	40% 3 16% 30% 11% 1	2340
May	1st to 10th	Day	37% 4 14% 32% 12% 1	2340
	11th to 20th	Day	41% 4 18% 27% 9% 1	2428
	21st to end	Day	40% 4 18% 25% 11% 1	2724
June	1st to 10th	Day	30% 4 19% 30% 16% 2	2520
	11th to 20th	Day	27% 4 19% 29% 18% 4	2520
	21st to end	Day	21% 3 13% 33% 23% 7%	2520
July	1st to 10th	Day	25% 4 13% 31% 22% 5%	2451
	11th to 20th	Day	18% 2 9% 28% 28% 14%	2445
	21st to end	Day	22% 3 11% 29% 25% 10%	2590
August	1st to 10th	Day	29% 4 14% 28% 19% 5%	2438
	11th to 20th	Day	23% 3 11% 34% 22% 8%	2272
	21st to end	Day	22% 3 10% 26% 28% 11%	2376
September	1st to 10th	Day	23% 2 8% 29% 27% 11%	2160
	11th to 20th	Day	25% 2 9% 31% 24% 8%	2026
	21st to end	Day	25% 2 8% 34% 28% 3	1980
October	1st to 10th	Day	35% 3 11% 25% 23% 4	1980
	11th to 20th	Day	32% 3 9% 30% 21% 5%	1708
	21st to end	Day	33% 3 14% 31% 15% 4	1782
November	1st to 10th	Day	30% 3 13% 27% 21% 5%	1673
	11th to 20th	Day	33% 3 10% 29% 21% 4	1710
	21st to end	Day	32% 3 15% 31% 16% 4	1629
December	1st to 10th	Day	37% 3 14% 29% 15% 2	1520
	11th to 20th	Day	29% 4 19% 37% 10% 1	1924
	21st to end	Day	45% 1 8% 33% 11% 1	2794
January	1st to 10th	Night	41% 2 13% 32% 10% 1	4417
	11th to 20th	Night	43% 2 15% 26% 13% 1	4430
	21st to end	Night	34% 3 19% 29% 14% 1	4873
February	1st to 10th	Night	47% 3 13% 23% 13% 1	2511
	11th to 20th	Night	42% 4 12% 26% 13% 3	2218
	21st to end	Night	37% 3 14% 28% 14% 5%	1884
March	1st to 10th	Night	39% 3 13% 28% 15% 2	2226
	11th to 20th	Night	36% 3 12% 27% 18% 3	2090
	21st to end	Night	44% 3 14% 26% 12% 1	2033
April	1st to 10th	Night	42% 5% 12% 24% 14% 3	1800
	11th to 20th	Night	43% 3 13% 22% 17% 3	1765
	21st to end	Night	40% 4 14% 27% 14% 1	1620
May	1st to 10th	Night	40% 5% 12% 29% 13% 2	1620
	11th to 20th	Night	39% 4 16% 31% 10%	1468
	21st to end	Night	40% 5% 17% 23% 14% 1	1552
June	1st to 10th	Night	29% 4 19% 29% 17% 2	1440
	11th to 20th	Night	32% 4 20% 25% 15% 3	1440
	21st to end	Night	25% 3 13% 32% 20% 6%	1440
July	1st to 10th	Night	25% 3 16% 29% 22% 5%	1400
	11th to 20th	Night	19% 3 12% 27% 26% 14%	1392
	21st to end	Night	23% 3 13% 27% 24% 11%	1488
August	1st to 10th	Night	27% 5% 15% 27% 19% 7%	1476
	11th to 20th	Night	22% 4 10% 29% 28% 6%	1626
	21st to end	Night	21% 3 11% 26% 27% 11%	1980
September	1st to 10th	Night	24% 2 8% 28% 28% 9%	1800
	11th to 20th	Night	22% 4 11% 29% 26% 7%	1934
	21st to end	Night	27% 3 7% 31% 27% 5%	1980
October	1st to 10th	Night	36% 3 10% 24% 21% 5%	1980
	11th to 20th	Night	30% 3 9% 29% 22% 7%	2230
	21st to end	Night	32% 3 14% 26% 19% 7%	2574
November	1st to 10th	Night	33% 3 12% 27% 19% 6%	2405
	11th to 20th	Night	36% 2 10% 27% 20% 5%	2470
	21st to end	Night	30% 4 14% 30% 19% 3	2550
December	1st to 10th	Night	37% 3 13% 29% 16% 2	2660
	11th to 20th	Night	32% 3 13% 36% 14% 2	3272
	21st to end	Night	43% 3 11% 31% 11% 2	4873

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	7% 4 32% 31% 21% 6%	270
	11th to 20th	Day	12% 9% 32% 31% 15% 2	270
	21st to end	Day	11% 9% 40% 28% 10% 2	297
February	1st to 10th	Day	13% 9% 35% 36% 6%	270
	11th to 20th	Day	13% 9% 40% 28% 10%	270
	21st to end	Day	14% 9% 40% 27% 8% 1	225
March	1st to 10th	Day	15% 6% 34% 30% 12% 3	255
	11th to 20th	Day	12% 5% 31% 33% 15% 5%	240
	21st to end	Day	20% 10% 26% 26% 14% 3	408
April	1st to 10th	Day	18% 12% 31% 29% 9% 1	420
	11th to 20th	Day	22% 11% 32% 25% 9%	423
	21st to end	Day	18% 7% 26% 31% 17% 1	600
May	1st to 10th	Day	16% 8% 26% 29% 17% 4	603
	11th to 20th	Day	21% 4 18% 33% 17% 7%	625
	21st to end	Day	18% 5% 27% 30% 15% 5%	679
June	1st to 10th	Day	7% 6% 21% 32% 23% 11%	630
	11th to 20th	Day	11% 5% 29% 35% 17% 4	630
	21st to end	Day	7% 5% 23% 34% 26% 4	630
July	1st to 10th	Day	7% 2 19% 39% 28% 5%	621
	11th to 20th	Day	7% 2 23% 44% 22% 3	618
	21st to end	Day	5% 2 18% 42% 29% 5%	684
August	1st to 10th	Day	6% 1 20% 40% 27% 6%	626
	11th to 20th	Day	7% 3 19% 37% 26% 8%	586
	21st to end	Day	7% 5% 18% 33% 25% 11%	495
September	1st to 10th	Day	7% 5% 24% 34% 24% 6%	450
	11th to 20th	Day	9% 1 19% 32% 28% 11%	316
	21st to end	Day	16% 7% 23% 30% 19% 6%	270
October	1st to 10th	Day	19% 6% 20% 27% 21% 8%	270
	11th to 20th	Day	15% 10% 33% 22% 15% 5%	270
	21st to end	Day	17% 9% 32% 25% 15% 2	297
November	1st to 10th	Day	11% 9% 33% 31% 12% 4	270
	11th to 20th	Day	13% 10% 31% 30% 13% 3	270
	21st to end	Day	12% 7% 33% 32% 13% 3	270
December	1st to 10th	Day	15% 9% 33% 33% 9% 1	270
	11th to 20th	Day	9% 7% 41% 32% 10% 1	270
	21st to end	Day	15% 10% 32% 29% 12% 2	297
January	1st to 10th	Night	8% 9% 35% 35% 12% 2	950
	11th to 20th	Night	10% 11% 34% 35% 9% 1	950
	21st to end	Night	12% 8% 35% 37% 8%	1045
February	1st to 10th	Night	16% 8% 36% 34% 7%	855
	11th to 20th	Night	10% 6% 41% 36% 7%	744
	21st to end	Night	11% 6% 39% 35% 8% 1	628
March	1st to 10th	Night	13% 8% 32% 38% 9% 1	742
	11th to 20th	Night	13% 6% 30% 37% 12% 1	650
	21st to end	Night	18% 8% 30% 34% 10% 1	594
April	1st to 10th	Night	16% 7% 34% 35% 7% 1	540
	11th to 20th	Night	19% 8% 32% 36% 4	533
	21st to end	Night	18% 9% 26% 36% 11%	540
May	1st to 10th	Night	15% 5% 28% 37% 14% 1	540
	11th to 20th	Night	18% 4 26% 37% 15% 1	531
	21st to end	Night	16% 6% 35% 32% 11% 1	584
June	1st to 10th	Night	10% 6% 27% 38% 17% 1	540
	11th to 20th	Night	12% 4 34% 40% 9% 1	540
	21st to end	Night	6% 2 29% 46% 16%	540
July	1st to 10th	Night	7% 2 24% 45% 20% 1	525
	11th to 20th	Night	5% 1 29% 49% 16%	522
	21st to end	Night	5% 1 25% 55% 15%	591
August	1st to 10th	Night	5% 3 22% 51% 18%	537
	11th to 20th	Night	5% 1 22% 53% 18%	534
	21st to end	Night	4 4 24% 49% 19%	594
September	1st to 10th	Night	10% 1 26% 44% 17% 1	540
	11th to 20th	Night	9% 3 27% 42% 19% 1	540
	21st to end	Night	13% 4 27% 41% 15% 1	540
October	1st to 10th	Night	17% 5% 26% 37% 14% 1	540
	11th to 20th	Night	14% 6% 30% 36% 13% 1	790
	21st to end	Night	14% 8% 30% 36% 12% 1	990
November	1st to 10th	Night	10% 4 34% 41% 11% 1	925
	11th to 20th	Night	11% 7% 34% 37% 11%	950
	21st to end	Night	9% 7% 36% 37% 10%	950
December	1st to 10th	Night	12% 8% 37% 33% 9%	950
	11th to 20th	Night	8% 6% 37% 37% 11% 1	950
	21st to end	Night	16% 10% 31% 34% 9%	1045

Page generated at 2024-03-03 04:28:55. Version ac07

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