Denmark
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Denmark clear sky chart from 2005-11-06 to 2026-07-31.

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% 6% 2 6% 5% 5% 5% 4 6% 8% 41%	138220
	Night	12% 6% 2 6% 4 4 4 4 6% 8% 43%	134799
Transparency	Day	39% 7% 12% 18% 17% 6%	141892
	Night	37% 7% 11% 18% 19% 8%	139199
Seeing	Day	13% 8% 22% 24% 21% 12%	17693
	Night	13% 7% 23% 33% 21% 3	27737

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	13% 4 2 5% 3 4 4 3 5% 7% 52%	5258
	11th to 20th	Day	12% 6% 2 5% 3 3 2 2 4 6% 57%	5280
	21st to end	Day	15% 8% 3 7% 4 4 5% 3 5% 7% 40%	5780
February	1st to 10th	Day	14% 7% 2 6% 4 4 4 4 6% 7% 43%	1937
	11th to 20th	Day	18% 7% 3 5% 4 3 3 3 4 5% 44%	2048
	21st to end	Day	16% 7% 2 5% 4 4 4 4 5% 5% 45%	1800
March	1st to 10th	Day	20% 8% 2 7% 4 3 4 3 5% 5% 38%	5045
	11th to 20th	Day	8% 4 2 5% 3 3 4 4 5% 7% 56%	5090
	21st to end	Day	13% 7% 2 6% 4 4 3 3 4 5% 47%	5586
April	1st to 10th	Day	8% 4 2 5% 4 4 5% 4 6% 7% 50%	2310
	11th to 20th	Day	9% 5% 2 6% 4 5% 4 3 6% 6% 50%	2447
	21st to end	Day	7% 5% 1 5% 4 4 4 4 6% 9% 51%	2627
May	1st to 10th	Day	14% 7% 3 7% 5% 5% 5% 4 6% 8% 37%	7616
	11th to 20th	Day	13% 6% 2 6% 4 5% 5% 4 6% 9% 40%	7626
	21st to end	Day	10% 6% 3 9% 6% 6% 6% 5% 7% 8% 35%	8391
June	1st to 10th	Day	9% 7% 3 7% 6% 5% 7% 6% 8% 10% 33%	2730
	11th to 20th	Day	7% 5% 2 5% 5% 6% 6% 5% 9% 12% 38%	2730
	21st to end	Day	4 4 2 7% 6% 6% 7% 5% 9% 11% 38%	2730
July	1st to 10th	Day	12% 8% 3 10% 7% 7% 7% 5% 8% 10% 24%	6030
	11th to 20th	Day	4 4 2 8% 7% 7% 8% 6% 11% 15% 29%	6030
	21st to end	Day	7% 7% 3 8% 6% 6% 7% 6% 9% 13% 28%	6554
August	1st to 10th	Day	21% 7% 2 7% 6% 6% 7% 5% 8% 10% 22%	4234
	11th to 20th	Day	8% 6% 2 7% 5% 6% 7% 6% 9% 11% 33%	4174
	21st to end	Day	7% 5% 2 7% 5% 5% 6% 6% 8% 12% 37%	4262
September	1st to 10th	Day	7% 6% 2 8% 5% 6% 6% 5% 7% 9% 39%	2200
	11th to 20th	Day	12% 6% 3 7% 5% 6% 6% 5% 6% 8% 38%	2200
	21st to end	Day	15% 7% 2 7% 4 4 4 3 5% 7% 41%	2200
October	1st to 10th	Day	12% 6% 2 7% 4 5% 4 3 4 6% 47%	2100
	11th to 20th	Day	10% 5% 1 4 3 3 3 2 5% 6% 59%	2000
	21st to end	Day	11% 5% 2 5% 3 3 3 2 4 5% 57%	2200
November	1st to 10th	Day	12% 5% 2 4 4 3 3 4 4 6% 53%	2057
	11th to 20th	Day	14% 7% 1 5% 3 2 3 2 4 7% 52%	2010
	21st to end	Day	12% 6% 2 5% 5% 4 4 3 5% 6% 49%	1890
December	1st to 10th	Day	10% 5% 2 5% 4 4 4 4 5% 7% 50%	3020
	11th to 20th	Day	13% 6% 2 5% 4 4 3 3 5% 6% 48%	3463
	21st to end	Day	18% 8% 2 5% 3 3 3 3 4 6% 44%	4565
January	1st to 10th	Night	10% 5% 2 6% 4 4 4 3 4 5% 53%	7635
	11th to 20th	Night	11% 5% 2 6% 4 4 4 3 5% 7% 49%	7680
	21st to end	Night	16% 8% 3 7% 4 4 4 3 4 5% 43%	8401
February	1st to 10th	Night	15% 5% 2 5% 4 4 4 3 5% 7% 45%	2677
	11th to 20th	Night	16% 6% 3 7% 4 4 4 2 4 5% 44%	2458
	21st to end	Night	13% 7% 2 6% 3 4 4 4 5% 6% 45%	2004
March	1st to 10th	Night	18% 8% 3 6% 4 4 4 3 5% 6% 39%	5028
	11th to 20th	Night	11% 4 1 4 3 3 3 3 5% 9% 54%	5090
	21st to end	Night	12% 5% 2 5% 4 3 4 4 5% 6% 50%	5588
April	1st to 10th	Night	9% 5% 2 5% 4 4 5% 3 6% 8% 50%	2310
	11th to 20th	Night	10% 5% 2 4 3 3 3 3 4 9% 53%	2119
	21st to end	Night	7% 4 2 6% 4 4 3 4 6% 7% 53%	2009
May	1st to 10th	Night	11% 7% 3 8% 5% 4 5% 5% 6% 9% 37%	5237
	11th to 20th	Night	12% 6% 2 5% 4 5% 4 4 8% 9% 41%	5234
	21st to end	Night	11% 6% 3 8% 6% 5% 5% 4 7% 9% 37%	5761
June	1st to 10th	Night	11% 6% 3 6% 5% 5% 6% 5% 9% 11% 35%	1890
	11th to 20th	Night	7% 6% 2 7% 4 6% 6% 6% 7% 12% 38%	1890
	21st to end	Night	5% 5% 2 7% 5% 6% 5% 6% 10% 12% 36%	1890
July	1st to 10th	Night	12% 9% 3 8% 5% 7% 7% 5% 8% 10% 25%	4148
	11th to 20th	Night	6% 4 2 8% 6% 5% 7% 6% 10% 15% 30%	4147
	21st to end	Night	8% 8% 4 10% 7% 6% 8% 6% 8% 10% 25%	4517
August	1st to 10th	Night	20% 8% 2 7% 6% 6% 6% 5% 9% 9% 23%	2915
	11th to 20th	Night	8% 6% 3 7% 5% 6% 6% 6% 8% 11% 33%	2875
	21st to end	Night	6% 4 2 6% 4 5% 5% 4 9% 13% 43%	3595
September	1st to 10th	Night	7% 6% 2 7% 5% 5% 6% 5% 7% 10% 40%	2200
	11th to 20th	Night	10% 7% 3 8% 6% 5% 6% 4 4 7% 40%	2200
	21st to end	Night	15% 7% 3 6% 5% 4 5% 4 6% 8% 39%	2200
October	1st to 10th	Night	12% 6% 2 6% 4 4 4 3 4 6% 49%	2298
	11th to 20th	Night	13% 4 2 4 3 2 3 3 3 5% 59%	2400
	21st to end	Night	9% 5% 2 5% 3 4 3 3 4 5% 57%	2640
November	1st to 10th	Night	11% 5% 2 5% 3 3 3 3 5% 5% 54%	2461
	11th to 20th	Night	13% 7% 2 5% 3 2 3 3 4 6% 52%	2607
	21st to end	Night	12% 6% 2 5% 4 3 4 3 5% 7% 49%	2730
December	1st to 10th	Night	13% 6% 2 5% 4 3 3 3 3 5% 54%	4380
	11th to 20th	Night	16% 6% 3 7% 4 3 4 3 4 5% 46%	4952
	21st to end	Night	18% 7% 2 5% 3 3 4 3 5% 6% 43%	6633

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	32% 4 9% 24% 26% 6%	5259
	11th to 20th	Day	31% 3 5% 15% 33% 14%	5280
	21st to end	Day	44% 4 5% 18% 18% 11%	5780
February	1st to 10th	Day	40% 5% 9% 20% 19% 7%	1937
	11th to 20th	Day	42% 4 5% 19% 23% 7%	2058
	21st to end	Day	41% 5% 7% 16% 20% 11%	1800
March	1st to 10th	Day	46% 5% 7% 12% 21% 9%	5045
	11th to 20th	Day	27% 5% 9% 16% 24% 18%	5090
	21st to end	Day	40% 4 7% 17% 22% 11%	5586
April	1st to 10th	Day	31% 7% 10% 20% 24% 8%	2310
	11th to 20th	Day	34% 5% 9% 20% 20% 12%	2447
	21st to end	Day	29% 6% 11% 25% 24% 5%	2627
May	1st to 10th	Day	43% 8% 12% 24% 11% 2	7651
	11th to 20th	Day	40% 7% 16% 21% 14% 2	7630
	21st to end	Day	44% 9% 14% 14% 17% 1	8405
June	1st to 10th	Day	43% 11% 16% 18% 11% 2	2730
	11th to 20th	Day	34% 10% 20% 23% 11% 1	2730
	21st to end	Day	34% 12% 20% 21% 10% 2	2730
July	1st to 10th	Day	51% 12% 18% 15% 4 1	5965
	11th to 20th	Day	38% 16% 31% 13% 2 1	5961
	21st to end	Day	43% 14% 19% 18% 6%	6370
August	1st to 10th	Day	55% 11% 20% 12% 3	4221
	11th to 20th	Day	39% 12% 17% 21% 10% 1	4213
	21st to end	Day	36% 10% 14% 30% 9% 1	4262
September	1st to 10th	Day	38% 12% 16% 15% 15% 6%	2200
	11th to 20th	Day	41% 9% 12% 15% 18% 4	2200
	21st to end	Day	42% 7% 11% 18% 17% 5%	2200
October	1st to 10th	Day	37% 5% 7% 14% 27% 10%	3425
	11th to 20th	Day	18% 3 5% 13% 32% 30%	3240
	21st to end	Day	24% 4 4 18% 35% 15%	3538
November	1st to 10th	Day	32% 4 8% 18% 24% 14%	2057
	11th to 20th	Day	34% 3 6% 19% 25% 12%	2010
	21st to end	Day	35% 5% 9% 21% 22% 9%	1890
December	1st to 10th	Day	33% 5% 8% 18% 26% 9%	3020
	11th to 20th	Day	37% 4 8% 23% 21% 6%	3460
	21st to end	Day	43% 3 6% 22% 23% 3	4565
January	1st to 10th	Night	33% 4 7% 22% 28% 6%	7636
	11th to 20th	Night	35% 3 6% 15% 29% 12%	7680
	21st to end	Night	44% 4 5% 13% 23% 10%	8401
February	1st to 10th	Night	39% 5% 8% 18% 21% 9%	2677
	11th to 20th	Night	43% 4 7% 17% 20% 9%	2459
	21st to end	Night	38% 7% 9% 15% 18% 13%	2004
March	1st to 10th	Night	45% 6% 8% 12% 20% 9%	5028
	11th to 20th	Night	28% 4 8% 13% 28% 20%	5090
	21st to end	Night	34% 5% 9% 19% 21% 12%	5588
April	1st to 10th	Night	32% 6% 12% 20% 21% 9%	2310
	11th to 20th	Night	29% 5% 9% 23% 23% 11%	2119
	21st to end	Night	29% 6% 12% 25% 23% 5%	2009
May	1st to 10th	Night	41% 8% 16% 22% 12% 2	5264
	11th to 20th	Night	37% 7% 18% 23% 14% 1	5235
	21st to end	Night	42% 10% 14% 18% 15% 2	5771
June	1st to 10th	Night	38% 11% 18% 20% 11% 2	1890
	11th to 20th	Night	35% 12% 20% 23% 8% 1	1890
	21st to end	Night	35% 14% 20% 20% 8% 2	1890
July	1st to 10th	Night	50% 11% 19% 16% 3 1	4105
	11th to 20th	Night	38% 15% 32% 12% 2	4096
	21st to end	Night	49% 13% 18% 15% 5%	4387
August	1st to 10th	Night	53% 12% 20% 12% 3	2904
	11th to 20th	Night	39% 14% 20% 20% 7% 1	2902
	21st to end	Night	29% 10% 18% 34% 9% 1	3595
September	1st to 10th	Night	37% 11% 15% 19% 11% 6%	2200
	11th to 20th	Night	43% 9% 13% 17% 15% 3	2200
	21st to end	Night	43% 9% 12% 17% 15% 4	2200
October	1st to 10th	Night	35% 4 10% 16% 27% 8%	3753
	11th to 20th	Night	18% 3 5% 13% 25% 36%	3899
	21st to end	Night	24% 4 6% 18% 31% 18%	4252
November	1st to 10th	Night	32% 5% 9% 15% 25% 14%	2461
	11th to 20th	Night	34% 5% 7% 16% 26% 13%	2607
	21st to end	Night	34% 5% 9% 18% 23% 11%	2730
December	1st to 10th	Night	34% 4 7% 13% 32% 10%	4380
	11th to 20th	Night	41% 4 9% 18% 19% 8%	4954
	21st to end	Night	41% 5% 6% 21% 24% 3	6633

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	15% 14% 48% 18% 4	330
	11th to 20th	Day	15% 20% 36% 20% 8% 1	330
	21st to end	Day	23% 21% 37% 15% 5%	363
February	1st to 10th	Day	16% 15% 44% 19% 6%	330
	11th to 20th	Day	29% 16% 33% 19% 3	330
	21st to end	Day	19% 19% 37% 20% 6% 1	343
March	1st to 10th	Day	16% 14% 30% 25% 13% 2	540
	11th to 20th	Day	14% 9% 42% 25% 8% 1	540
	21st to end	Day	15% 11% 38% 23% 12% 1	594
April	1st to 10th	Day	11% 15% 31% 28% 14% 2	540
	11th to 20th	Day	10% 12% 25% 26% 20% 7%	532
	21st to end	Day	9% 9% 22% 27% 22% 10%	540
May	1st to 10th	Day	10% 10% 27% 27% 17% 10%	543
	11th to 20th	Day	13% 5% 16% 28% 25% 14%	567
	21st to end	Day	12% 4 16% 24% 24% 19%	617
June	1st to 10th	Day	9% 4 14% 24% 31% 17%	570
	11th to 20th	Day	8% 4 14% 27% 25% 22%	570
	21st to end	Day	5% 1 11% 29% 29% 24%	570
July	1st to 10th	Day	9% 1 5% 20% 34% 30%	565
	11th to 20th	Day	6% 2 3 18% 39% 32%	564
	21st to end	Day	6% 3 7% 23% 36% 25%	616
August	1st to 10th	Day	14% 3 11% 20% 29% 23%	526
	11th to 20th	Day	9% 2 8% 19% 32% 29%	519
	21st to end	Day	13% 2 11% 21% 31% 23%	583
September	1st to 10th	Day	8% 3 13% 28% 28% 20%	530
	11th to 20th	Day	15% 4 13% 25% 32% 11%	530
	21st to end	Day	17% 2 12% 26% 29% 13%	530
October	1st to 10th	Day	16% 5% 19% 30% 23% 8%	530
	11th to 20th	Day	10% 6% 18% 33% 23% 9%	530
	21st to end	Day	14% 6% 21% 28% 24% 7%	583
November	1st to 10th	Day	15% 7% 27% 27% 19% 5%	535
	11th to 20th	Day	18% 10% 33% 27% 11% 2	450
	21st to end	Day	12% 13% 31% 29% 13% 2	330
December	1st to 10th	Day	20% 14% 35% 22% 8% 1	330
	11th to 20th	Day	19% 12% 36% 22% 8% 3	330
	21st to end	Day	22% 11% 37% 19% 9% 2	363
January	1st to 10th	Night	17% 12% 36% 29% 6%	840
	11th to 20th	Night	15% 13% 34% 30% 8%	840
	21st to end	Night	18% 12% 40% 27% 3	924
February	1st to 10th	Night	17% 11% 33% 33% 6%	840
	11th to 20th	Night	20% 14% 35% 29% 3	823
	21st to end	Night	16% 14% 35% 30% 4	692
March	1st to 10th	Night	15% 9% 34% 36% 7%	840
	11th to 20th	Night	14% 11% 35% 32% 7%	840
	21st to end	Night	12% 10% 36% 31% 10%	924
April	1st to 10th	Night	11% 12% 33% 34% 10%	840
	11th to 20th	Night	12% 9% 28% 35% 14% 1	831
	21st to end	Night	8% 6% 27% 44% 14%	749
May	1st to 10th	Night	10% 5% 28% 41% 15% 1	630
	11th to 20th	Night	10% 5% 25% 35% 22% 3	621
	21st to end	Night	10% 2 15% 38% 33% 3	683
June	1st to 10th	Night	12% 3 12% 41% 27% 4	630
	11th to 20th	Night	9% 2 12% 38% 30% 10%	630
	21st to end	Night	6% 3 10% 35% 39% 7%	630
July	1st to 10th	Night	10% 2 7% 31% 44% 7%	615
	11th to 20th	Night	8% 2 4 29% 50% 8%	612
	21st to end	Night	7% 2 8% 34% 45% 5%	687
August	1st to 10th	Night	12% 2 7% 27% 43% 8%	597
	11th to 20th	Night	10% 1 5% 32% 43% 9%	594
	21st to end	Night	12% 1 9% 30% 41% 7%	841
September	1st to 10th	Night	9% 2 10% 32% 42% 5%	800
	11th to 20th	Night	13% 2 10% 33% 37% 4	800
	21st to end	Night	17% 3 14% 34% 29% 4	800
October	1st to 10th	Night	14% 4 17% 36% 25% 5%	800
	11th to 20th	Night	14% 5% 21% 33% 24% 4	800
	21st to end	Night	11% 5% 25% 33% 25% 2	880
November	1st to 10th	Night	14% 6% 22% 36% 19% 3	820
	11th to 20th	Night	16% 8% 27% 33% 14% 1	840
	21st to end	Night	13% 8% 29% 33% 16% 1	840
December	1st to 10th	Night	18% 9% 30% 32% 10% 1	840
	11th to 20th	Night	18% 8% 27% 34% 12% 1	840
	21st to end	Night	21% 11% 25% 32% 10%	924

Page generated at 2026-07-28 03:25:19. Version ac07

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