Insel Haus
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Insel Haus clear sky chart from 2005-11-06 to 2024-09-29.

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	13% 10% 4 8% 5% 5% 4 4 5% 7% 35%	101016
	Night	15% 12% 4 10% 6% 5% 4 3 5% 6% 30%	97323
Transparency	Day	27% 48% 7% 13% 6%	100769
	Night	30% 48% 6% 10% 5%	97189
Seeing	Day	17% 5% 22% 32% 19% 5%	15460
	Night	20% 8% 25% 30% 14% 2	24897

By Month

Percentage Cloud Cover NE (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	14% 18% 10% 19% 8% 7% 5% 3 4 4 7%	2504
	11th to 20th	Day	14% 17% 7% 19% 17% 6% 5% 3 4 4 6%	2530
	21st to end	Day	13% 21% 7% 15% 8% 6% 5% 4 5% 5% 11%	2783
February	1st to 10th	Day	9% 14% 5% 13% 8% 6% 6% 3 5% 7% 24%	1653
	11th to 20th	Day	12% 13% 5% 12% 7% 6% 5% 4 6% 6% 25%	1774
	21st to end	Day	10% 14% 5% 10% 7% 6% 5% 4 6% 7% 27%	1570
March	1st to 10th	Day	12% 11% 3 8% 5% 4 3 3 6% 7% 38%	3118
	11th to 20th	Day	8% 13% 4 10% 7% 6% 5% 4 5% 6% 32%	3447
	21st to end	Day	14% 11% 7% 9% 5% 5% 5% 4 5% 6% 27%	3867
April	1st to 10th	Day	17% 11% 3 8% 5% 5% 5% 3 5% 7% 31%	2280
	11th to 20th	Day	18% 10% 3 7% 4 4 4 3 5% 6% 36%	2408
	21st to end	Day	15% 9% 3 9% 5% 5% 4 3 6% 7% 35%	2470
May	1st to 10th	Day	14% 8% 2 6% 4 5% 5% 4 5% 7% 40%	4108
	11th to 20th	Day	11% 7% 2 7% 5% 5% 6% 4 5% 7% 42%	4194
	21st to end	Day	12% 6% 2 5% 4 4 4 4 6% 9% 45%	5044
June	1st to 10th	Day	13% 5% 2 6% 4 5% 4 5% 6% 9% 42%	2850
	11th to 20th	Day	11% 5% 2 7% 4 5% 5% 5% 7% 9% 40%	2850
	21st to end	Day	14% 7% 3 5% 4 4 3 4 5% 9% 43%	2850
July	1st to 10th	Day	16% 7% 2 6% 4 3 4 3 5% 7% 44%	4641
	11th to 20th	Day	7% 5% 2 5% 4 4 4 3 6% 8% 52%	4440
	21st to end	Day	9% 5% 2 5% 3 4 3 3 6% 8% 52%	4814
August	1st to 10th	Day	7% 6% 2 6% 5% 5% 5% 5% 6% 9% 45%	4206
	11th to 20th	Day	11% 5% 2 6% 4 4 4 4 6% 8% 47%	4044
	21st to end	Day	11% 6% 2 7% 4 4 4 3 4 7% 48%	4479
September	1st to 10th	Day	14% 6% 2 6% 4 4 4 3 5% 8% 44%	2220
	11th to 20th	Day	12% 5% 2 6% 4 5% 4 5% 5% 8% 44%	2090
	21st to end	Day	15% 8% 2 7% 5% 4 3 3 5% 7% 38%	2069
October	1st to 10th	Day	19% 10% 3 7% 4 3 5% 4 5% 9% 32%	1945
	11th to 20th	Day	21% 15% 4 10% 5% 5% 5% 4 5% 6% 20%	1730
	21st to end	Day	24% 15% 3 8% 5% 6% 5% 4 5% 7% 18%	1782
November	1st to 10th	Day	17% 14% 4 10% 5% 6% 6% 4 5% 8% 23%	1672
	11th to 20th	Day	13% 19% 7% 12% 8% 6% 5% 4 5% 5% 17%	1659
	21st to end	Day	20% 20% 9% 12% 6% 5% 5% 2 4 4 12%	1493
December	1st to 10th	Day	13% 25% 9% 16% 8% 5% 5% 3 3 3 10%	1330
	11th to 20th	Day	16% 19% 6% 17% 10% 7% 5% 3 4 3 11%	1671
	21st to end	Day	23% 21% 9% 17% 7% 5% 3 2 3 2 9%	2431
January	1st to 10th	Night	15% 17% 8% 17% 7% 6% 5% 4 4 5% 14%	4448
	11th to 20th	Night	12% 16% 7% 19% 13% 7% 5% 3 4 3 11%	4440
	21st to end	Night	15% 21% 7% 14% 8% 5% 5% 4 4 5% 13%	4884
February	1st to 10th	Night	10% 16% 5% 11% 10% 7% 4 5% 5% 5% 22%	2526
	11th to 20th	Night	10% 13% 5% 14% 7% 6% 4 4 6% 6% 24%	2291
	21st to end	Night	14% 14% 5% 9% 8% 6% 5% 4 6% 6% 25%	1884
March	1st to 10th	Night	15% 11% 3 6% 4 3 3 2 4 7% 41%	3722
	11th to 20th	Night	9% 12% 4 9% 5% 4 5% 3 5% 7% 37%	3511
	21st to end	Night	14% 9% 6% 9% 5% 4 5% 3 6% 6% 32%	3792
April	1st to 10th	Night	19% 11% 3 7% 6% 5% 5% 4 5% 6% 29%	1900
	11th to 20th	Night	19% 9% 2 7% 5% 4 5% 3 4 5% 36%	1720
	21st to end	Night	17% 9% 2 8% 5% 4 5% 3 5% 6% 35%	1710
May	1st to 10th	Night	16% 8% 3 8% 5% 5% 4 4 5% 5% 37%	2833
	11th to 20th	Night	12% 8% 3 8% 6% 5% 4 4 6% 6% 39%	2701
	21st to end	Night	16% 6% 3 5% 4 3 3 3 5% 8% 42%	2541
June	1st to 10th	Night	13% 7% 2 6% 5% 5% 4 4 6% 9% 39%	1330
	11th to 20th	Night	11% 5% 2 6% 6% 4 5% 4 8% 8% 42%	1330
	21st to end	Night	14% 7% 2 5% 5% 4 4 4 5% 6% 44%	1330
July	1st to 10th	Night	13% 5% 2 6% 5% 5% 4 4 5% 8% 43%	2325
	11th to 20th	Night	8% 5% 2 6% 5% 4 4 4 5% 7% 52%	2530
	21st to end	Night	9% 6% 2 4 4 4 4 4 5% 8% 50%	2750
August	1st to 10th	Night	9% 6% 3 6% 5% 5% 4 4 5% 8% 44%	2724
	11th to 20th	Night	13% 5% 2 5% 3 3 3 3 5% 9% 49%	2785
	21st to end	Night	10% 5% 2 5% 4 3 4 3 5% 6% 52%	3174
September	1st to 10th	Night	13% 7% 2 6% 4 4 3 4 5% 6% 47%	1939
	11th to 20th	Night	15% 5% 2 5% 4 4 4 3 6% 8% 43%	2090
	21st to end	Night	17% 8% 3 7% 4 4 4 4 6% 7% 38%	2079
October	1st to 10th	Night	19% 8% 2 7% 5% 4 4 4 4 6% 37%	2014
	11th to 20th	Night	23% 13% 4 7% 5% 5% 4 4 5% 6% 24%	2227
	21st to end	Night	26% 15% 4 9% 6% 5% 4 3 4 4 21%	2574
November	1st to 10th	Night	17% 15% 4 9% 6% 4 4 3 5% 8% 25%	2406
	11th to 20th	Night	16% 18% 5% 13% 7% 5% 5% 3 5% 5% 17%	2518
	21st to end	Night	19% 21% 8% 12% 6% 4 5% 3 4 4 14%	2683
December	1st to 10th	Night	14% 21% 8% 16% 9% 5% 4 3 4 4 12%	2850
	11th to 20th	Night	16% 18% 6% 19% 8% 5% 4 3 4 4 11%	3526
	21st to end	Night	24% 23% 9% 13% 5% 5% 3 3 3 2 9%	5236

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	54% 38% 5% 3	2505
	11th to 20th	Day	57% 36% 5% 2 1	2530
	21st to end	Day	50% 39% 7% 3 1	2783
February	1st to 10th	Day	21% 65% 5% 6% 3	1653
	11th to 20th	Day	22% 64% 4 5% 4	1783
	21st to end	Day	19% 65% 4 8% 4	1570
March	1st to 10th	Day	28% 39% 10% 14% 7% 1	3120
	11th to 20th	Day	35% 39% 7% 14% 4 1	3447
	21st to end	Day	37% 40% 6% 10% 7% 1	3867
April	1st to 10th	Day	20% 65% 3 8% 4	2280
	11th to 20th	Day	17% 65% 3 7% 6% 1	2408
	21st to end	Day	17% 65% 3 8% 6% 1	2470
May	1st to 10th	Day	28% 39% 4 16% 11% 1	4120
	11th to 20th	Day	27% 40% 6% 21% 7%	4198
	21st to end	Day	23% 39% 8% 15% 14% 1	5044
June	1st to 10th	Day	15% 65% 4 10% 6% 1	2850
	11th to 20th	Day	16% 65% 5% 8% 5% 1	2850
	21st to end	Day	14% 64% 5% 11% 5% 1	2850
July	1st to 10th	Day	30% 37% 11% 15% 7% 1	4570
	11th to 20th	Day	17% 38% 12% 27% 6%	4365
	21st to end	Day	18% 36% 7% 26% 13%	4662
August	1st to 10th	Day	19% 40% 10% 22% 8%	4191
	11th to 20th	Day	25% 39% 10% 20% 6%	4083
	21st to end	Day	25% 39% 12% 21% 4	4478
September	1st to 10th	Day	17% 61% 6% 12% 4	2220
	11th to 20th	Day	14% 60% 5% 15% 6%	2090
	21st to end	Day	18% 60% 7% 11% 3	2069
October	1st to 10th	Day	23% 63% 3 9% 3	1945
	11th to 20th	Day	24% 64% 4 7% 1	1730
	21st to end	Day	28% 62% 3 5% 2	1782
November	1st to 10th	Day	27% 58% 4 8% 2	1672
	11th to 20th	Day	30% 59% 5% 4 2	1659
	21st to end	Day	33% 60% 4 3 1	1493
December	1st to 10th	Day	32% 59% 4 3 1	1330
	11th to 20th	Day	42% 48% 4 5% 1	1671
	21st to end	Day	56% 36% 3 3 3	2431
January	1st to 10th	Night	47% 37% 7% 6% 3	4448
	11th to 20th	Night	52% 36% 6% 4 1	4440
	21st to end	Night	49% 39% 7% 4 1	4884
February	1st to 10th	Night	21% 65% 4 6% 4	2526
	11th to 20th	Night	21% 64% 4 9% 2	2293
	21st to end	Night	19% 64% 5% 6% 5%	1884
March	1st to 10th	Night	27% 39% 12% 15% 6%	3733
	11th to 20th	Night	29% 39% 10% 15% 6% 1	3512
	21st to end	Night	34% 40% 8% 13% 5% 1	3792
April	1st to 10th	Night	22% 65% 2 7% 4	1900
	11th to 20th	Night	19% 65% 2 9% 4 2	1720
	21st to end	Night	19% 65% 3 7% 6% 1	1710
May	1st to 10th	Night	31% 40% 5% 14% 8% 1	2840
	11th to 20th	Night	27% 40% 4 20% 9%	2702
	21st to end	Night	28% 39% 10% 10% 9% 4	2542
June	1st to 10th	Night	15% 64% 4 9% 7%	1330
	11th to 20th	Night	16% 66% 3 9% 5% 2	1330
	21st to end	Night	15% 64% 4 11% 5% 2	1330
July	1st to 10th	Night	29% 37% 11% 13% 9% 1	2287
	11th to 20th	Night	19% 37% 12% 21% 11%	2482
	21st to end	Night	20% 36% 10% 17% 16%	2662
August	1st to 10th	Night	24% 40% 9% 17% 9%	2715
	11th to 20th	Night	24% 38% 9% 21% 7% 1	2812
	21st to end	Night	20% 38% 9% 23% 9%	3174
September	1st to 10th	Night	15% 61% 5% 12% 6%	1939
	11th to 20th	Night	14% 60% 6% 13% 6%	2090
	21st to end	Night	17% 60% 7% 12% 4	2079
October	1st to 10th	Night	22% 63% 4 8% 4	2014
	11th to 20th	Night	23% 62% 7% 7% 1	2227
	21st to end	Night	26% 62% 4 6% 2	2574
November	1st to 10th	Night	28% 59% 4 7% 2	2406
	11th to 20th	Night	27% 60% 6% 5% 2	2518
	21st to end	Night	32% 59% 4 3 1	2683
December	1st to 10th	Night	30% 60% 4 5%	2850
	11th to 20th	Night	40% 49% 4 3 2 1	3525
	21st to end	Night	55% 36% 3 4 1	5236

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	20% 10% 33% 26% 9% 2	265
	11th to 20th	Day	22% 9% 31% 29% 8% 1	270
	21st to end	Day	25% 5% 24% 30% 15% 1	297
February	1st to 10th	Day	17% 10% 35% 26% 10% 1	270
	11th to 20th	Day	16% 7% 44% 23% 9% 1	270
	21st to end	Day	17% 13% 35% 29% 6%	225
March	1st to 10th	Day	15% 8% 32% 30% 14%	270
	11th to 20th	Day	16% 9% 29% 32% 12% 2	440
	21st to end	Day	24% 7% 26% 31% 10% 2	506
April	1st to 10th	Day	22% 7% 25% 35% 9% 2	460
	11th to 20th	Day	24% 6% 28% 27% 12% 2	452
	21st to end	Day	20% 5% 30% 30% 13% 3	460
May	1st to 10th	Day	22% 2 27% 30% 16% 3	463
	11th to 20th	Day	16% 3 18% 39% 19% 5%	548
	21st to end	Day	14% 2 18% 38% 22% 6%	734
June	1st to 10th	Day	12% 2 22% 38% 23% 4	680
	11th to 20th	Day	13% 2 19% 40% 22% 5%	680
	21st to end	Day	18% 4 14% 37% 23% 4	680
July	1st to 10th	Day	9% 1 13% 40% 28% 8%	671
	11th to 20th	Day	10% 2 14% 35% 31% 8%	668
	21st to end	Day	12% 2 13% 33% 31% 9%	739
August	1st to 10th	Day	12% 1 12% 35% 31% 10%	550
	11th to 20th	Day	10% 3 9% 30% 33% 14%	479
	21st to end	Day	14% 4 13% 35% 27% 8%	539
September	1st to 10th	Day	16% 3 16% 30% 26% 9%	490
	11th to 20th	Day	13% 3 14% 29% 29% 12%	490
	21st to end	Day	19% 5% 17% 30% 23% 6%	483
October	1st to 10th	Day	22% 8% 22% 24% 18% 6%	450
	11th to 20th	Day	25% 9% 26% 28% 11% 1	380
	21st to end	Day	35% 4 22% 28% 9% 2	297
November	1st to 10th	Day	20% 11% 26% 28% 12% 2	270
	11th to 20th	Day	21% 13% 35% 23% 8% 1	246
	21st to end	Day	28% 13% 36% 21% 3	180
December	1st to 10th	Day	21% 12% 38% 21% 8% 1	180
	11th to 20th	Day	22% 16% 34% 20% 8% 1	180
	21st to end	Day	27% 15% 36% 17% 4 2	198
January	1st to 10th	Night	23% 13% 32% 25% 6% 1	950
	11th to 20th	Night	23% 11% 33% 24% 9%	950
	21st to end	Night	19% 8% 32% 30% 9% 1	1045
February	1st to 10th	Night	16% 10% 36% 29% 8% 1	816
	11th to 20th	Night	18% 10% 34% 28% 10%	743
	21st to end	Night	19% 8% 34% 31% 7%	628
March	1st to 10th	Night	17% 6% 34% 31% 10% 1	760
	11th to 20th	Night	17% 9% 32% 33% 9% 1	760
	21st to end	Night	19% 7% 27% 34% 13% 1	823
April	1st to 10th	Night	24% 6% 26% 34% 10% 1	570
	11th to 20th	Night	23% 5% 23% 34% 12% 2	563
	21st to end	Night	22% 3 26% 34% 15% 1	570
May	1st to 10th	Night	18% 2 21% 37% 19% 2	570
	11th to 20th	Night	19% 4 14% 40% 21% 2	561
	21st to end	Night	15% 1 19% 34% 26% 4	499
June	1st to 10th	Night	14% 3 18% 38% 25% 2	380
	11th to 20th	Night	12% 2 18% 38% 25% 4	380
	21st to end	Night	17% 3 13% 38% 25% 3	380
July	1st to 10th	Night	11% 2 12% 41% 31% 4	430
	11th to 20th	Night	7% 3 12% 38% 31% 9%	552
	21st to end	Night	11% 2 11% 40% 30% 5%	624
August	1st to 10th	Night	12% 3 12% 40% 28% 5%	567
	11th to 20th	Night	10% 2 16% 31% 31% 10%	564
	21st to end	Night	15% 3 13% 39% 27% 4	627
September	1st to 10th	Night	16% 3 18% 29% 27% 7%	609
	11th to 20th	Night	15% 4 17% 31% 25% 8%	760
	21st to end	Night	22% 4 17% 28% 23% 7%	756
October	1st to 10th	Night	23% 5% 20% 32% 18% 3	720
	11th to 20th	Night	29% 9% 24% 29% 8% 1	720
	21st to end	Night	34% 9% 22% 28% 6% 1	792
November	1st to 10th	Night	24% 11% 27% 26% 10% 1	740
	11th to 20th	Night	26% 14% 30% 22% 7% 1	760
	21st to end	Night	32% 13% 30% 21% 5%	783
December	1st to 10th	Night	22% 15% 36% 20% 6% 1	950
	11th to 20th	Night	26% 16% 34% 17% 6% 1	950
	21st to end	Night	33% 11% 31% 19% 5%	1045

Page generated at 2024-09-26 09:52:19. Version ac07

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