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 2024-11-02.

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	8% 6% 2 5% 4 3 4 3 5% 8% 51%	101395
	Night	8% 6% 2 6% 4 4 4 4 5% 7% 49%	97772
Transparency	Day	32% 3 14% 29% 18% 4	101139
	Night	35% 3 13% 28% 17% 4	97618
Seeing	Day	12% 6% 26% 32% 18% 5%	15912
	Night	11% 6% 32% 39% 12% 1	25831

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 7% 3 11% 6% 4 3 3 6% 7% 47%	2538
	11th to 20th	Day	4 8% 4 11% 5% 5% 4 3 5% 7% 45%	2540
	21st to end	Day	3 6% 3 8% 4 4 5% 3 4 7% 52%	2794
February	1st to 10th	Day	9% 11% 4 8% 6% 4 5% 3 5% 6% 38%	1681
	11th to 20th	Day	6% 11% 4 6% 5% 4 4 3 6% 6% 45%	1849
	21st to end	Day	6% 8% 3 8% 5% 4 4 4 5% 7% 46%	1570
March	1st to 10th	Day	7% 6% 2 6% 4 3 3 4 5% 7% 54%	3130
	11th to 20th	Day	7% 6% 1 4 4 3 3 2 6% 8% 56%	3291
	21st to end	Day	16% 11% 4 7% 4 3 4 3 5% 8% 35%	4069
April	1st to 10th	Day	14% 8% 3 5% 3 3 4 3 5% 8% 44%	2280
	11th to 20th	Day	15% 7% 3 6% 4 4 5% 4 5% 7% 41%	2263
	21st to end	Day	13% 7% 3 5% 4 4 4 4 6% 8% 43%	2470
May	1st to 10th	Day	17% 8% 2 6% 4 4 4 3 5% 6% 40%	4120
	11th to 20th	Day	10% 5% 2 5% 4 3 4 4 5% 8% 49%	4308
	21st to end	Day	14% 6% 2 6% 4 3 4 4 6% 7% 43%	4825
June	1st to 10th	Day	8% 4 1 4 3 4 4 4 6% 9% 52%	2660
	11th to 20th	Day	8% 4 2 4 3 3 4 4 7% 8% 53%	2660
	21st to end	Day	5% 3 1 3 3 3 3 4 6% 7% 60%	2660
July	1st to 10th	Day	5% 4 1 5% 3 4 5% 5% 6% 8% 54%	4430
	11th to 20th	Day	4 3 1 4 2 3 3 3 6% 9% 61%	4430
	21st to end	Day	3 2 1 3 3 3 4 4 6% 9% 62%	4802
August	1st to 10th	Day	5% 4 2 5% 4 4 4 4 6% 9% 52%	4319
	11th to 20th	Day	7% 4 2 4 3 3 5% 3 6% 9% 53%	3984
	21st to end	Day	4 3 1 3 3 3 3 3 5% 8% 64%	4180
September	1st to 10th	Day	6% 3 1 4 3 3 3 3 3 7% 64%	2280
	11th to 20th	Day	8% 3 1 4 2 3 3 2 4 7% 63%	2138
	21st to end	Day	10% 3 1 3 2 2 2 3 4 6% 63%	2090
October	1st to 10th	Day	12% 6% 2 5% 3 2 3 3 5% 6% 53%	2090
	11th to 20th	Day	11% 5% 2 5% 3 3 4 2 5% 6% 55%	1802
	21st to end	Day	10% 7% 2 4 4 4 4 3 5% 8% 50%	1881
November	1st to 10th	Day	7% 5% 2 5% 3 5% 4 4 6% 6% 54%	1682
	11th to 20th	Day	6% 6% 2 7% 4 4 3 4 4 6% 53%	1710
	21st to end	Day	5% 9% 3 5% 3 3 3 4 6% 7% 51%	1629
December	1st to 10th	Day	6% 8% 3 7% 5% 3 4 3 6% 8% 46%	1520
	11th to 20th	Day	4 7% 2 6% 3 3 3 4 6% 8% 53%	1926
	21st to end	Day	11% 14% 2 6% 4 4 4 3 4 6% 43%	2794
January	1st to 10th	Night	5% 10% 3 10% 5% 4 4 4 5% 7% 43%	4417
	11th to 20th	Night	4 8% 3 10% 7% 6% 6% 4 6% 6% 42%	4430
	21st to end	Night	3 7% 3 7% 4 4 4 4 6% 8% 50%	4873
February	1st to 10th	Night	9% 12% 4 8% 5% 4 4 4 5% 5% 40%	2511
	11th to 20th	Night	6% 9% 4 8% 5% 5% 5% 5% 6% 5% 42%	2218
	21st to end	Night	7% 8% 2 6% 6% 4 3 4 5% 7% 47%	1884
March	1st to 10th	Night	10% 8% 4 6% 4 4 4 4 5% 6% 45%	3734
	11th to 20th	Night	7% 6% 2 4 3 3 3 4 5% 9% 53%	3674
	21st to end	Night	14% 10% 3 8% 4 5% 4 3 5% 7% 35%	3556
April	1st to 10th	Night	13% 7% 3 6% 4 4 5% 4 5% 7% 43%	1900
	11th to 20th	Night	15% 6% 2 6% 5% 4 3 4 5% 6% 42%	1864
	21st to end	Night	15% 7% 2 5% 3 4 4 4 5% 8% 43%	1710
May	1st to 10th	Night	14% 6% 2 6% 5% 5% 5% 5% 6% 7% 39%	2850
	11th to 20th	Night	9% 4 1 4 3 3 4 3 6% 8% 55%	2593
	21st to end	Night	15% 6% 2 6% 5% 4 4 4 5% 7% 43%	2762
June	1st to 10th	Night	8% 5% 1 4 3 4 4 4 7% 9% 52%	1520
	11th to 20th	Night	11% 3 2 3 5% 4 4 4 7% 7% 49%	1520
	21st to end	Night	6% 3 2 4 4 4 4 4 6% 8% 56%	1520
July	1st to 10th	Night	7% 3 1 4 3 3 5% 5% 6% 8% 55%	2540
	11th to 20th	Night	4 2 1 4 3 3 3 4 7% 10% 60%	2540
	21st to end	Night	3 4 2 3 3 4 4 4 6% 8% 60%	2761
August	1st to 10th	Night	5% 5% 2 6% 4 4 5% 5% 7% 9% 47%	2619
	11th to 20th	Night	7% 5% 2 5% 4 4 4 4 6% 8% 50%	2852
	21st to end	Night	3 3 1 5% 4 4 5% 4 6% 8% 57%	3487
September	1st to 10th	Night	7% 3 2 4 2 2 3 2 4 6% 64%	1900
	11th to 20th	Night	7% 3 1 4 3 2 3 3 6% 7% 60%	2042
	21st to end	Night	10% 3 1 3 3 2 3 2 3 6% 62%	2090
October	1st to 10th	Night	14% 5% 2 4 4 3 3 3 4 6% 52%	2090
	11th to 20th	Night	10% 5% 2 4 3 3 4 3 5% 6% 56%	2355
	21st to end	Night	11% 6% 2 4 3 3 4 3 5% 7% 53%	2717
November	1st to 10th	Night	7% 6% 2 6% 4 4 4 4 6% 8% 49%	2419
	11th to 20th	Night	7% 8% 2 7% 5% 4 4 3 5% 5% 51%	2470
	21st to end	Night	6% 7% 2 4 4 4 4 4 6% 7% 52%	2550
December	1st to 10th	Night	7% 9% 3 6% 4 4 4 3 6% 6% 49%	2660
	11th to 20th	Night	4 7% 2 6% 4 4 5% 4 6% 7% 51%	3271
	21st to end	Night	12% 11% 3 6% 3 3 4 4 5% 6% 42%	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	32% 2 9% 28% 23% 5%	3130
	11th to 20th	Day	29% 2 16% 40% 12% 1	3291
	21st to end	Day	49% 3 20% 21% 6%	4069
April	1st to 10th	Day	39% 4 14% 30% 10% 3	2280
	11th to 20th	Day	42% 4 12% 24% 15% 2	2266
	21st to end	Day	40% 3 16% 30% 11% 1	2470
May	1st to 10th	Day	45% 3 11% 26% 12% 3	4120
	11th to 20th	Day	34% 2 14% 33% 14% 3	4312
	21st to end	Day	41% 3 14% 29% 13% 1	4825
June	1st to 10th	Day	30% 4 20% 29% 15% 3	2660
	11th to 20th	Day	28% 4 18% 28% 18% 4	2660
	21st to end	Day	22% 3 12% 34% 23% 6%	2660
July	1st to 10th	Day	26% 5% 13% 30% 23% 3	4361
	11th to 20th	Day	20% 4 11% 32% 24% 9%	4355
	21st to end	Day	18% 4 11% 27% 30% 10%	4651
August	1st to 10th	Day	27% 4 17% 23% 22% 7%	4304
	11th to 20th	Day	28% 6% 14% 29% 18% 4	4023
	21st to end	Day	20% 4 10% 27% 26% 13%	4179
September	1st to 10th	Day	23% 2 8% 29% 28% 11%	2280
	11th to 20th	Day	24% 2 9% 32% 25% 8%	2138
	21st to end	Day	24% 2 8% 33% 28% 4	2090
October	1st to 10th	Day	33% 2 11% 24% 24% 5%	2090
	11th to 20th	Day	31% 2 9% 31% 21% 5%	1802
	21st to end	Day	34% 3 14% 31% 15% 4	1881
November	1st to 10th	Day	30% 3 13% 27% 21% 5%	1682
	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	41% 2 8% 26% 21% 2	3734
	11th to 20th	Night	30% 2 14% 35% 18% 2	3674
	21st to end	Night	50% 2 19% 22% 7% 1	3556
April	1st to 10th	Night	41% 5% 13% 25% 14% 2	1900
	11th to 20th	Night	42% 3 12% 22% 18% 3	1864
	21st to end	Night	41% 3 14% 27% 13% 1	1710
May	1st to 10th	Night	44% 4 10% 25% 14% 3	2850
	11th to 20th	Night	29% 2 14% 39% 14% 1	2594
	21st to end	Night	42% 3 13% 28% 13% 1	2762
June	1st to 10th	Night	29% 4 19% 29% 17% 2	1520
	11th to 20th	Night	32% 4 20% 25% 16% 3	1520
	21st to end	Night	26% 4 13% 32% 20% 5%	1520
July	1st to 10th	Night	25% 4 18% 23% 25% 4	2500
	11th to 20th	Night	20% 4 14% 32% 22% 8%	2492
	21st to end	Night	21% 4 14% 28% 26% 8%	2674
August	1st to 10th	Night	30% 6% 16% 23% 20% 6%	2611
	11th to 20th	Night	31% 5% 17% 23% 20% 4	2879
	21st to end	Night	25% 5% 13% 23% 26% 9%	3487
September	1st to 10th	Night	23% 2 8% 29% 29% 9%	1900
	11th to 20th	Night	23% 4 11% 29% 27% 7%	2042
	21st to end	Night	26% 3 6% 31% 27% 7%	2090
October	1st to 10th	Night	34% 3 10% 23% 23% 7%	2090
	11th to 20th	Night	29% 3 9% 30% 22% 6%	2355
	21st to end	Night	32% 3 14% 26% 19% 7%	2717
November	1st to 10th	Night	33% 3 12% 27% 19% 6%	2419
	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% 33% 30% 12% 3	270
	11th to 20th	Day	11% 6% 33% 33% 14% 4	270
	21st to end	Day	20% 10% 27% 26% 14% 3	449
April	1st to 10th	Day	20% 11% 32% 27% 9% 1	460
	11th to 20th	Day	22% 12% 31% 25% 10%	464
	21st to end	Day	18% 8% 27% 30% 16% 1	650
May	1st to 10th	Day	18% 8% 25% 28% 16% 4	653
	11th to 20th	Day	20% 4 19% 32% 18% 7%	675
	21st to end	Day	18% 5% 27% 31% 14% 5%	734
June	1st to 10th	Day	7% 6% 22% 32% 22% 10%	680
	11th to 20th	Day	11% 6% 28% 34% 16% 4	680
	21st to end	Day	7% 5% 24% 34% 25% 4	680
July	1st to 10th	Day	7% 2 20% 39% 27% 6%	671
	11th to 20th	Day	6% 2 23% 43% 22% 4	668
	21st to end	Day	4 2 18% 41% 29% 5%	739
August	1st to 10th	Day	6% 2 20% 39% 27% 6%	676
	11th to 20th	Day	7% 3 21% 37% 25% 8%	634
	21st to end	Day	8% 5% 19% 34% 24% 10%	539
September	1st to 10th	Day	7% 4 23% 34% 24% 7%	490
	11th to 20th	Day	8% 2 20% 32% 27% 11%	348
	21st to end	Day	15% 7% 23% 30% 19% 7%	300
October	1st to 10th	Day	17% 7% 20% 26% 21% 10%	300
	11th to 20th	Day	14% 9% 32% 24% 16% 4	300
	21st to end	Day	18% 9% 32% 25% 15% 2	330
November	1st to 10th	Day	11% 9% 33% 31% 12% 4	273
	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	14% 8% 32% 38% 9% 1	760
	11th to 20th	Night	12% 6% 32% 37% 12% 1	686
	21st to end	Night	18% 7% 30% 34% 10% 1	627
April	1st to 10th	Night	17% 6% 34% 36% 7% 1	570
	11th to 20th	Night	18% 9% 33% 36% 4	563
	21st to end	Night	18% 8% 28% 35% 11%	570
May	1st to 10th	Night	15% 5% 28% 38% 13% 1	570
	11th to 20th	Night	17% 4 26% 38% 14% 1	561
	21st to end	Night	16% 6% 35% 32% 11% 1	617
June	1st to 10th	Night	10% 6% 28% 39% 16% 1	570
	11th to 20th	Night	12% 5% 34% 40% 9% 1	570
	21st to end	Night	6% 3 30% 45% 15%	570
July	1st to 10th	Night	8% 3 24% 45% 19% 1	555
	11th to 20th	Night	5% 1 29% 49% 15%	552
	21st to end	Night	5% 1 25% 54% 15% 1	624
August	1st to 10th	Night	6% 4 22% 50% 18%	567
	11th to 20th	Night	5% 2 24% 51% 17%	564
	21st to end	Night	4 4 24% 50% 18%	627
September	1st to 10th	Night	9% 1 26% 46% 17% 1	570
	11th to 20th	Night	9% 4 27% 42% 18% 1	570
	21st to end	Night	12% 5% 26% 41% 15% 1	570
October	1st to 10th	Night	16% 5% 26% 38% 14% 1	570
	11th to 20th	Night	13% 6% 30% 37% 13% 1	835
	21st to end	Night	14% 7% 30% 36% 12% 1	1045
November	1st to 10th	Night	10% 4 34% 41% 11% 1	931
	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 2024-10-29 23:22:57. Version ac07

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