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 2024-02-05.

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	14% 10% 4 8% 7% 4 5% 5% 5% 7% 33%	77865
	Night	15% 12% 5% 9% 7% 4 5% 4 5% 6% 27%	81018
Transparency	Day	51% 4 12% 22% 10% 1	77568
	Night	58% 3 11% 18% 8% 1	80850
Seeing	Day	17% 5% 22% 32% 19% 5%	14468
	Night	21% 8% 25% 30% 14% 2	24152

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% 17% 11% 17% 10% 6% 6% 5% 4 4 7%	2504
	11th to 20th	Day	14% 16% 7% 15% 20% 5% 5% 4 4 4 6%	2530
	21st to end	Day	13% 20% 8% 13% 10% 5% 6% 5% 5% 5% 11%	2783
February	1st to 10th	Day	9% 13% 6% 11% 9% 5% 6% 4 5% 7% 24%	1599
	11th to 20th	Day	13% 12% 5% 10% 9% 4 5% 4 6% 6% 26%	1678
	21st to end	Day	11% 14% 5% 9% 8% 4 5% 4 5% 7% 26%	1480
March	1st to 10th	Day	13% 9% 3 7% 8% 4 5% 3 5% 6% 36%	1798
	11th to 20th	Day	10% 10% 5% 8% 7% 4 4 4 5% 6% 38%	1961
	21st to end	Day	16% 8% 4 5% 6% 3 5% 5% 5% 7% 37%	2204
April	1st to 10th	Day	18% 10% 4 7% 6% 4 5% 4 5% 7% 30%	2160
	11th to 20th	Day	18% 10% 3 6% 5% 3 4 4 5% 6% 36%	2279
	21st to end	Day	15% 8% 3 8% 6% 3 4 4 6% 8% 34%	2340
May	1st to 10th	Day	15% 8% 3 5% 4 3 4 5% 5% 6% 40%	2340
	11th to 20th	Day	16% 7% 2 5% 6% 3 5% 4 4 7% 41%	2358
	21st to end	Day	10% 6% 2 5% 5% 3 5% 5% 6% 9% 44%	2834
June	1st to 10th	Day	13% 5% 2 5% 5% 3 4 5% 6% 9% 43%	2700
	11th to 20th	Day	11% 5% 3 6% 5% 3 6% 5% 7% 9% 41%	2700
	21st to end	Day	14% 6% 3 5% 4 2 4 5% 5% 9% 44%	2700
July	1st to 10th	Day	7% 4 2 3 4 3 4 5% 5% 9% 54%	2637
	11th to 20th	Day	10% 5% 2 4 4 2 5% 4 6% 9% 48%	2520
	21st to end	Day	9% 5% 2 5% 4 3 5% 4 7% 9% 48%	2743
August	1st to 10th	Day	10% 6% 2 4 4 3 4 5% 5% 9% 48%	2388
	11th to 20th	Day	9% 4 1 4 6% 3 4 5% 6% 8% 49%	2303
	21st to end	Day	11% 6% 2 5% 5% 2 4 4 5% 8% 49%	2549
September	1st to 10th	Day	15% 6% 2 5% 5% 3 4 4 5% 7% 43%	2104
	11th to 20th	Day	12% 5% 2 5% 5% 3 5% 6% 5% 8% 44%	1980
	21st to end	Day	15% 7% 3 6% 6% 4 3 5% 5% 8% 37%	1980
October	1st to 10th	Day	19% 10% 3 6% 4 3 4 5% 4 9% 33%	1945
	11th to 20th	Day	21% 15% 4 8% 6% 4 5% 5% 5% 6% 20%	1730
	21st to end	Day	24% 15% 4 7% 6% 4 6% 5% 5% 7% 18%	1782
November	1st to 10th	Day	17% 14% 4 9% 6% 4 6% 5% 4 8% 23%	1672
	11th to 20th	Day	14% 17% 7% 10% 9% 5% 5% 5% 5% 5% 17%	1659
	21st to end	Day	20% 19% 9% 11% 8% 4 6% 3 4 4 13%	1493
December	1st to 10th	Day	14% 22% 12% 15% 9% 4 4 4 3 3 10%	1330
	11th to 20th	Day	16% 17% 7% 15% 11% 5% 6% 4 4 3 11%	1671
	21st to end	Day	23% 20% 10% 16% 7% 3 4 3 3 2 9%	2431
January	1st to 10th	Night	15% 16% 8% 15% 8% 4 5% 5% 4 5% 14%	4448
	11th to 20th	Night	12% 15% 8% 16% 16% 5% 5% 4 4 3 11%	4440
	21st to end	Night	15% 19% 8% 12% 9% 4 6% 5% 4 5% 13%	4884
February	1st to 10th	Night	10% 15% 6% 10% 11% 5% 6% 5% 5% 5% 22%	2455
	11th to 20th	Night	11% 12% 6% 12% 8% 4 6% 4 6% 6% 25%	2167
	21st to end	Night	15% 13% 6% 9% 9% 4 5% 4 5% 6% 24%	1776
March	1st to 10th	Night	11% 10% 4 8% 6% 3 4 4 4 6% 38%	2149
	11th to 20th	Night	12% 10% 5% 8% 6% 4 5% 5% 4 6% 35%	1997
	21st to end	Night	15% 8% 3 6% 6% 3 5% 4 5% 6% 37%	2166
April	1st to 10th	Night	19% 10% 4 6% 6% 4 6% 5% 5% 6% 29%	1800
	11th to 20th	Night	18% 9% 3 5% 6% 3 5% 5% 4 6% 36%	1629
	21st to end	Night	17% 8% 3 7% 6% 3 5% 5% 5% 6% 35%	1620
May	1st to 10th	Night	14% 7% 3 7% 6% 4 6% 5% 6% 6% 36%	1620
	11th to 20th	Night	16% 8% 3 7% 6% 3 4 4 6% 7% 36%	1533
	21st to end	Night	12% 5% 3 5% 5% 2 4 5% 6% 8% 46%	1440
June	1st to 10th	Night	13% 6% 2 5% 5% 3 4 5% 6% 10% 41%	1260
	11th to 20th	Night	11% 4 2 6% 6% 3 5% 5% 7% 8% 42%	1260
	21st to end	Night	13% 6% 3 5% 5% 3 5% 4 5% 6% 45%	1260
July	1st to 10th	Night	9% 4 2 4 4 2 3 5% 6% 10% 51%	1319
	11th to 20th	Night	8% 4 2 5% 7% 3 5% 5% 5% 7% 48%	1440
	21st to end	Night	8% 5% 3 4 4 4 5% 5% 5% 7% 49%	1575
August	1st to 10th	Night	8% 5% 3 5% 5% 2 3 4 5% 9% 51%	1548
	11th to 20th	Night	9% 4 2 5% 4 3 4 4 6% 9% 51%	1598
	21st to end	Night	12% 6% 2 4 5% 2 5% 4 5% 6% 47%	1804
September	1st to 10th	Night	13% 7% 2 5% 5% 3 3 5% 5% 6% 47%	1836
	11th to 20th	Night	16% 5% 2 5% 5% 3 4 4 6% 7% 42%	1980
	21st to end	Night	18% 7% 3 6% 5% 3 4 5% 6% 7% 37%	1980
October	1st to 10th	Night	19% 8% 2 6% 6% 3 4 4 4 6% 37%	2014
	11th to 20th	Night	24% 12% 4 7% 6% 4 4 5% 5% 6% 24%	2227
	21st to end	Night	26% 14% 4 8% 7% 4 4 4 4 4 21%	2574
November	1st to 10th	Night	17% 14% 5% 8% 7% 3 4 4 5% 8% 25%	2406
	11th to 20th	Night	16% 17% 6% 11% 8% 4 5% 5% 5% 5% 17%	2518
	21st to end	Night	20% 20% 9% 11% 7% 3 4 5% 4 4 14%	2683
December	1st to 10th	Night	14% 19% 10% 15% 10% 4 4 3 4 5% 12%	2850
	11th to 20th	Night	16% 18% 7% 17% 10% 4 5% 4 4 4 11%	3526
	21st to end	Night	24% 22% 10% 12% 7% 4 4 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	80% 3 8% 8% 1	2505
	11th to 20th	Day	84% 3 6% 5% 1	2530
	21st to end	Day	76% 3 11% 8% 2	2783
February	1st to 10th	Day	61% 3 14% 18% 4	1599
	11th to 20th	Day	58% 4 13% 15% 9% 1	1687
	21st to end	Day	56% 4 11% 21% 8%	1480
March	1st to 10th	Day	48% 4 12% 22% 12% 2	1800
	11th to 20th	Day	47% 3 12% 25% 9% 2	1961
	21st to end	Day	48% 4 12% 23% 11% 3	2204
April	1st to 10th	Day	55% 3 10% 20% 12% 1	2160
	11th to 20th	Day	49% 3 9% 21% 15% 2	2279
	21st to end	Day	49% 3 11% 18% 16% 4	2340
May	1st to 10th	Day	43% 3 10% 25% 14% 4	2340
	11th to 20th	Day	43% 4 8% 27% 15% 2	2362
	21st to end	Day	37% 4 15% 28% 13% 3	2834
June	1st to 10th	Day	37% 4 13% 30% 14% 2	2700
	11th to 20th	Day	39% 5% 13% 27% 16% 2	2700
	21st to end	Day	38% 4 15% 27% 13% 3	2700
July	1st to 10th	Day	28% 4 15% 32% 19% 1	2566
	11th to 20th	Day	33% 3 13% 34% 15% 2	2445
	21st to end	Day	33% 4 16% 30% 17% 1	2591
August	1st to 10th	Day	33% 4 19% 30% 13% 1	2373
	11th to 20th	Day	32% 4 17% 33% 13% 1	2303
	21st to end	Day	35% 4 17% 30% 12% 2	2549
September	1st to 10th	Day	39% 5% 13% 29% 12% 1	2104
	11th to 20th	Day	37% 4 18% 33% 9%	1980
	21st to end	Day	45% 4 18% 26% 7%	1980
October	1st to 10th	Day	50% 4 13% 25% 9% 1	1945
	11th to 20th	Day	63% 5% 12% 17% 3	1730
	21st to end	Day	64% 5% 11% 16% 4	1782
November	1st to 10th	Day	58% 3 12% 21% 6%	1672
	11th to 20th	Day	69% 3 14% 10% 5%	1659
	21st to end	Day	76% 3 12% 8% 1	1493
December	1st to 10th	Day	79% 2 9% 7% 2	1330
	11th to 20th	Day	79% 3 8% 8% 2	1671
	21st to end	Day	85% 2 5% 5% 3	2431
January	1st to 10th	Night	72% 3 11% 10% 4	4448
	11th to 20th	Night	80% 2 10% 7% 1	4440
	21st to end	Night	74% 2 11% 9% 3	4884
February	1st to 10th	Night	63% 3 10% 17% 6%	2455
	11th to 20th	Night	59% 5% 13% 17% 6% 1	2169
	21st to end	Night	61% 2 11% 18% 7%	1776
March	1st to 10th	Night	49% 3 13% 22% 13% 1	2160
	11th to 20th	Night	50% 3 10% 24% 11% 2	1998
	21st to end	Night	47% 3 11% 22% 14% 2	2166
April	1st to 10th	Night	55% 4 8% 20% 12% 1	1800
	11th to 20th	Night	48% 4 8% 25% 13% 3	1629
	21st to end	Night	50% 4 9% 21% 14% 4	1620
May	1st to 10th	Night	47% 4 10% 22% 14% 4	1620
	11th to 20th	Night	47% 3 7% 24% 16% 2	1534
	21st to end	Night	37% 4 13% 26% 15% 5%	1441
June	1st to 10th	Night	39% 3 13% 26% 18% 1	1260
	11th to 20th	Night	38% 4 12% 28% 14% 4	1260
	21st to end	Night	40% 4 12% 28% 13% 3	1260
July	1st to 10th	Night	29% 3 14% 31% 20% 2	1281
	11th to 20th	Night	35% 4 12% 30% 18% 1	1392
	21st to end	Night	35% 4 16% 27% 18% 1	1487
August	1st to 10th	Night	31% 4 17% 33% 12% 2	1539
	11th to 20th	Night	31% 4 20% 32% 13% 1	1598
	21st to end	Night	37% 4 17% 27% 14% 1	1804
September	1st to 10th	Night	39% 4 13% 28% 15% 1	1836
	11th to 20th	Night	39% 3 17% 31% 8% 1	1980
	21st to end	Night	47% 3 17% 26% 6%	1980
October	1st to 10th	Night	48% 4 12% 25% 11% 1	2014
	11th to 20th	Night	61% 3 13% 18% 4	2227
	21st to end	Night	67% 3 10% 15% 5%	2574
November	1st to 10th	Night	57% 4 12% 21% 6% 1	2406
	11th to 20th	Night	68% 3 12% 11% 5%	2518
	21st to end	Night	75% 3 11% 9% 2	2683
December	1st to 10th	Night	77% 2 10% 10% 1	2850
	11th to 20th	Night	77% 3 10% 7% 3 1	3525
	21st to end	Night	84% 2 6% 6% 2	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% 11% 35% 26% 9% 2	252
	11th to 20th	Day	17% 6% 45% 22% 8% 2	240
	21st to end	Day	18% 14% 33% 29% 6%	198
March	1st to 10th	Day	15% 9% 33% 28% 15%	240
	11th to 20th	Day	15% 9% 29% 32% 12% 2	401
	21st to end	Day	25% 8% 23% 31% 11% 2	462
April	1st to 10th	Day	23% 6% 25% 34% 10% 2	420
	11th to 20th	Day	24% 7% 27% 28% 13% 2	412
	21st to end	Day	20% 5% 30% 29% 13% 3	420
May	1st to 10th	Day	22% 2 26% 30% 16% 3	423
	11th to 20th	Day	18% 3 18% 38% 18% 5%	504
	21st to end	Day	13% 2 18% 39% 22% 6%	679
June	1st to 10th	Day	13% 2 21% 38% 23% 4	630
	11th to 20th	Day	13% 2 19% 39% 22% 5%	630
	21st to end	Day	17% 3 14% 37% 25% 4	630
July	1st to 10th	Day	8% 1 14% 41% 28% 8%	621
	11th to 20th	Day	11% 2 15% 36% 29% 8%	618
	21st to end	Day	12% 2 13% 35% 29% 9%	684
August	1st to 10th	Day	13% 1 11% 35% 30% 10%	507
	11th to 20th	Day	9% 3 10% 31% 33% 14%	439
	21st to end	Day	14% 4 13% 34% 27% 8%	495
September	1st to 10th	Day	17% 3 15% 30% 26% 10%	450
	11th to 20th	Day	14% 3 15% 32% 26% 11%	450
	21st to end	Day	19% 5% 18% 30% 22% 6%	450
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	795
	11th to 20th	Night	19% 9% 34% 27% 11%	703
	21st to end	Night	20% 8% 34% 30% 7%	592
March	1st to 10th	Night	16% 7% 35% 31% 11% 1	720
	11th to 20th	Night	18% 9% 32% 32% 9% 1	720
	21st to end	Night	19% 6% 27% 34% 13% 1	780
April	1st to 10th	Night	23% 6% 26% 33% 10% 1	540
	11th to 20th	Night	23% 5% 23% 35% 13% 2	533
	21st to end	Night	22% 3 25% 34% 15% 1	540
May	1st to 10th	Night	17% 2 21% 37% 19% 2	540
	11th to 20th	Night	20% 4 14% 40% 20% 2	531
	21st to end	Night	15% 1 18% 35% 27% 5%	473
June	1st to 10th	Night	13% 3 18% 39% 25% 2	360
	11th to 20th	Night	12% 2 19% 36% 27% 4	360
	21st to end	Night	16% 3 13% 39% 26% 4	360
July	1st to 10th	Night	11% 1 11% 41% 31% 4	406
	11th to 20th	Night	7% 3 12% 39% 30% 9%	522
	21st to end	Night	10% 2 12% 41% 29% 6%	591
August	1st to 10th	Night	12% 3 12% 40% 28% 5%	537
	11th to 20th	Night	11% 1 16% 31% 32% 10%	534
	21st to end	Night	15% 3 14% 39% 26% 4	594
September	1st to 10th	Night	16% 3 17% 30% 27% 7%	576
	11th to 20th	Night	16% 4 18% 33% 22% 8%	720
	21st to end	Night	22% 4 18% 28% 21% 7%	720
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 2024-02-02 05:20:27. Version ac07

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