Marsing
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Marsing clear sky chart from 2005-11-06 to 2024-01-12.

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	6% 5% 2 5% 5% 3 4 5% 5% 7% 52%	74826
	Night	8% 6% 3 6% 5% 3 5% 5% 5% 7% 47%	74897
Transparency	Day	31% 7% 12% 20% 19% 11%	74530
	Night	34% 8% 13% 20% 16% 9%	74714
Seeing	Day	8% 8% 23% 31% 22% 8%	13378
	Night	10% 6% 22% 37% 22% 3	22787

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	12% 10% 5% 8% 7% 5% 7% 5% 8% 7% 25%	1519
	11th to 20th	Day	12% 9% 4 10% 9% 4 7% 7% 8% 7% 25%	1448
	21st to end	Day	11% 10% 5% 10% 9% 5% 6% 5% 6% 7% 26%	1584
February	1st to 10th	Day	9% 9% 5% 9% 6% 3 5% 5% 6% 7% 36%	1590
	11th to 20th	Day	8% 10% 4 7% 6% 3 6% 6% 6% 8% 38%	1750
	21st to end	Day	9% 8% 4 6% 6% 5% 5% 6% 7% 8% 37%	1480
March	1st to 10th	Day	8% 9% 4 7% 7% 4 6% 6% 6% 10% 34%	1800
	11th to 20th	Day	7% 9% 3 6% 5% 3 6% 5% 7% 8% 40%	1876
	21st to end	Day	9% 9% 4 6% 7% 4 6% 5% 7% 8% 36%	2312
April	1st to 10th	Day	9% 7% 3 5% 6% 3 6% 5% 6% 7% 42%	2160
	11th to 20th	Day	6% 7% 2 6% 6% 3 5% 5% 6% 7% 46%	2142
	21st to end	Day	7% 6% 3 4 4 3 4 4 5% 8% 51%	2340
May	1st to 10th	Day	4 3 1 4 5% 3 5% 5% 5% 7% 57%	2340
	11th to 20th	Day	8% 5% 2 5% 5% 3 5% 4 5% 9% 49%	2407
	21st to end	Day	8% 4 2 5% 6% 3 5% 6% 6% 10% 46%	2723
June	1st to 10th	Day	7% 4 3 4 5% 3 5% 5% 7% 9% 47%	2520
	11th to 20th	Day	6% 3 2 4 3 2 4 3 6% 8% 60%	2520
	21st to end	Day	2 2 1 2 2 2 3 4 4 5% 73%	2520
July	1st to 10th	Day	2 2 1 2 2 2 4 3 4 5% 74%	2520
	11th to 20th	Day	1 1 1 1 2 2 2 2 3 5% 81%	2520
	21st to end	Day	2 2 1 2 2 2 3 3 3 5% 76%	2741
August	1st to 10th	Day	3 2 1 3 3 2 3 4 4 5% 68%	2441
	11th to 20th	Day	1 1 2 2 1 3 3 4 5% 78%	2272
	21st to end	Day	2 2 1 2 3 1 2 3 3 4 77%	2376
September	1st to 10th	Day	2 2 1 1 2 2 2 3 3 5% 77%	2160
	11th to 20th	Day	4 3 1 2 3 2 2 3 4 8% 68%	2017
	21st to end	Day	5% 3 2 3 3 3 3 3 4 6% 65%	1980
October	1st to 10th	Day	7% 5% 1 4 4 2 4 4 4 6% 58%	1980
	11th to 20th	Day	5% 3 1 3 4 3 5% 5% 5% 8% 58%	1734
	21st to end	Day	8% 5% 2 4 5% 3 4 5% 6% 8% 50%	1782
November	1st to 10th	Day	11% 7% 4 5% 6% 4 5% 5% 6% 8% 40%	1674
	11th to 20th	Day	10% 7% 3 7% 6% 4 5% 6% 6% 8% 38%	1710
	21st to end	Day	8% 8% 4 7% 7% 4 7% 7% 5% 8% 34%	1646
December	1st to 10th	Day	12% 11% 4 8% 5% 4 5% 5% 6% 8% 31%	1520
	11th to 20th	Day	13% 10% 6% 12% 8% 4 5% 5% 6% 8% 22%	1928
	21st to end	Day	9% 9% 5% 10% 9% 5% 6% 7% 6% 7% 27%	2794
January	1st to 10th	Night	12% 12% 4 9% 7% 4 6% 6% 5% 9% 25%	2646
	11th to 20th	Night	11% 9% 4 10% 9% 4 6% 5% 6% 6% 28%	2534
	21st to end	Night	11% 10% 4 10% 7% 4 5% 5% 6% 6% 32%	2772
February	1st to 10th	Night	11% 9% 4 7% 6% 3 5% 5% 6% 8% 35%	2364
	11th to 20th	Night	9% 8% 3 5% 6% 4 6% 6% 7% 8% 39%	2098
	21st to end	Night	9% 8% 4 7% 7% 3 5% 7% 7% 7% 36%	1776
March	1st to 10th	Night	10% 7% 3 7% 6% 4 6% 6% 6% 7% 39%	2160
	11th to 20th	Night	8% 8% 3 5% 5% 3 6% 5% 6% 8% 42%	2084
	21st to end	Night	9% 8% 4 7% 6% 3 7% 6% 6% 7% 36%	2039
April	1st to 10th	Night	9% 7% 3 6% 6% 3 4 5% 5% 8% 44%	1800
	11th to 20th	Night	8% 7% 3 6% 5% 3 6% 5% 6% 7% 45%	1765
	21st to end	Night	7% 5% 2 5% 4 3 4 5% 5% 6% 54%	1620
May	1st to 10th	Night	6% 4 1 4 4 3 3 5% 6% 8% 57%	1620
	11th to 20th	Night	6% 4 2 5% 4 4 6% 6% 7% 9% 47%	1484
	21st to end	Night	7% 6% 2 5% 6% 4 5% 6% 6% 10% 43%	1552
June	1st to 10th	Night	8% 4 1 5% 6% 4 4 5% 6% 10% 46%	1440
	11th to 20th	Night	6% 4 2 4 4 2 4 4 4 7% 60%	1440
	21st to end	Night	2 1 1 3 3 2 4 4 4 7% 69%	1440
July	1st to 10th	Night	1 1 1 3 3 2 2 3 5% 7% 71%	1440
	11th to 20th	Night	1 1 2 1 2 3 4 5% 80%	1440
	21st to end	Night	2 2 1 2 3 2 3 3 5% 6% 72%	1576
August	1st to 10th	Night	3 3 2 3 3 2 3 3 5% 6% 68%	1498
	11th to 20th	Night	1 1 1 1 1 2 3 3 4 6% 76%	1627
	21st to end	Night	2 1 1 2 2 1 3 2 3 6% 75%	1980
September	1st to 10th	Night	2 2 1 1 3 1 3 3 4 4 77%	1800
	11th to 20th	Night	3 3 1 3 3 2 3 4 5% 6% 68%	1942
	21st to end	Night	6% 3 1 2 3 2 3 3 4 6% 67%	1980
October	1st to 10th	Night	7% 4 2 4 4 2 4 4 4 6% 59%	1980
	11th to 20th	Night	6% 3 2 3 3 2 3 4 5% 6% 61%	2222
	21st to end	Night	6% 4 2 5% 5% 3 5% 4 6% 8% 50%	2574
November	1st to 10th	Night	11% 7% 3 6% 5% 3 5% 5% 5% 7% 44%	2405
	11th to 20th	Night	13% 7% 3 6% 5% 3 5% 5% 7% 7% 39%	2470
	21st to end	Night	10% 7% 3 6% 5% 3 5% 5% 7% 8% 41%	2531
December	1st to 10th	Night	13% 11% 4 7% 6% 3 5% 5% 6% 7% 34%	2660
	11th to 20th	Night	12% 10% 5% 9% 8% 4 6% 5% 6% 7% 26%	3276
	21st to end	Night	12% 11% 5% 8% 6% 4 6% 6% 6% 9% 28%	4862

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	53% 15% 17% 13% 2	1519
	11th to 20th	Day	51% 14% 17% 16% 2	1448
	21st to end	Day	52% 16% 17% 11% 3 1	1584
February	1st to 10th	Day	42% 12% 22% 18% 5% 1	1590
	11th to 20th	Day	42% 9% 18% 21% 9%	1760
	21st to end	Day	41% 9% 18% 20% 10% 1	1480
March	1st to 10th	Day	45% 12% 13% 22% 7% 2	1800
	11th to 20th	Day	40% 10% 14% 24% 11% 1	1876
	21st to end	Day	45% 10% 16% 20% 8% 1	2312
April	1st to 10th	Day	40% 8% 15% 21% 13% 2	2160
	11th to 20th	Day	36% 6% 12% 24% 18% 4	2145
	21st to end	Day	32% 7% 12% 28% 18% 3	2340
May	1st to 10th	Day	26% 6% 10% 29% 23% 5%	2340
	11th to 20th	Day	32% 8% 11% 27% 18% 4	2410
	21st to end	Day	33% 10% 15% 23% 16% 3	2724
June	1st to 10th	Day	33% 8% 13% 26% 18% 2	2520
	11th to 20th	Day	22% 6% 10% 25% 27% 9%	2520
	21st to end	Day	14% 5% 7% 19% 35% 21%	2520
July	1st to 10th	Day	13% 4 6% 15% 30% 32%	2451
	11th to 20th	Day	9% 2 4 9% 28% 47%	2445
	21st to end	Day	12% 2 5% 8% 27% 46%	2589
August	1st to 10th	Day	18% 4 7% 14% 29% 28%	2424
	11th to 20th	Day	10% 3 5% 17% 34% 31%	2272
	21st to end	Day	12% 3 5% 14% 40% 25%	2376
September	1st to 10th	Day	11% 3 6% 16% 32% 32%	2160
	11th to 20th	Day	17% 5% 8% 23% 29% 17%	2017
	21st to end	Day	21% 4 7% 25% 32% 11%	1980
October	1st to 10th	Day	28% 5% 12% 24% 27% 5%	1980
	11th to 20th	Day	23% 5% 13% 34% 21% 4	1734
	21st to end	Day	29% 8% 17% 30% 15% 2	1782
November	1st to 10th	Day	39% 7% 16% 25% 13%	1674
	11th to 20th	Day	40% 11% 19% 24% 6% 1	1710
	21st to end	Day	40% 9% 23% 22% 6%	1646
December	1st to 10th	Day	45% 11% 23% 14% 6%	1520
	11th to 20th	Day	56% 11% 17% 13% 3	1928
	21st to end	Day	50% 11% 20% 16% 4	2794
January	1st to 10th	Night	53% 13% 21% 11% 3	2646
	11th to 20th	Night	50% 11% 15% 19% 5%	2534
	21st to end	Night	49% 11% 19% 17% 4	2772
February	1st to 10th	Night	43% 10% 20% 22% 4	2364
	11th to 20th	Night	39% 10% 18% 21% 10% 1	2099
	21st to end	Night	42% 9% 16% 20% 11% 1	1776
March	1st to 10th	Night	42% 9% 13% 22% 12% 2	2160
	11th to 20th	Night	37% 8% 13% 27% 13% 1	2084
	21st to end	Night	45% 9% 15% 22% 9% 1	2039
April	1st to 10th	Night	38% 7% 11% 24% 17% 3	1800
	11th to 20th	Night	35% 8% 10% 26% 17% 4	1765
	21st to end	Night	29% 5% 13% 27% 22% 3	1620
May	1st to 10th	Night	23% 6% 10% 27% 30% 3	1620
	11th to 20th	Night	31% 8% 12% 23% 22% 5%	1484
	21st to end	Night	36% 9% 12% 26% 13% 4	1552
June	1st to 10th	Night	31% 9% 13% 25% 19% 2	1440
	11th to 20th	Night	27% 5% 7% 22% 30% 9%	1440
	21st to end	Night	14% 5% 9% 19% 33% 20%	1440
July	1st to 10th	Night	12% 3 6% 16% 29% 34%	1400
	11th to 20th	Night	7% 3 4 11% 28% 47%	1392
	21st to end	Night	14% 2 5% 7% 26% 46%	1488
August	1st to 10th	Night	17% 4 7% 15% 25% 32%	1490
	11th to 20th	Night	9% 3 7% 13% 30% 38%	1627
	21st to end	Night	13% 3 5% 14% 33% 33%	1980
September	1st to 10th	Night	12% 3 5% 13% 29% 38%	1800
	11th to 20th	Night	17% 4 7% 21% 25% 27%	1942
	21st to end	Night	20% 4 5% 20% 31% 19%	1980
October	1st to 10th	Night	26% 5% 9% 22% 27% 10%	1980
	11th to 20th	Night	23% 5% 10% 29% 27% 5%	2222
	21st to end	Night	30% 7% 15% 26% 21% 2	2574
November	1st to 10th	Night	37% 7% 12% 24% 18% 1	2405
	11th to 20th	Night	42% 7% 16% 27% 9%	2470
	21st to end	Night	37% 9% 17% 26% 10%	2531
December	1st to 10th	Night	47% 9% 19% 17% 7% 1	2660
	11th to 20th	Night	52% 11% 17% 17% 3	3276
	21st to end	Night	47% 11% 21% 14% 6%	4862

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	18% 10% 23% 27% 16% 6%	180
	11th to 20th	Day	14% 10% 22% 30% 20% 4	162
	21st to end	Day	14% 5% 22% 34% 22% 4	176
February	1st to 10th	Day	11% 14% 31% 26% 13% 4	275
	11th to 20th	Day	12% 12% 29% 29% 14% 4	415
	21st to end	Day	13% 15% 29% 27% 14% 2	346
March	1st to 10th	Day	12% 14% 33% 30% 10% 1	420
	11th to 20th	Day	10% 12% 30% 30% 16% 2	420
	21st to end	Day	11% 16% 32% 25% 14% 2	462
April	1st to 10th	Day	13% 17% 25% 20% 18% 7%	420
	11th to 20th	Day	10% 15% 31% 25% 14% 6%	412
	21st to end	Day	9% 11% 34% 24% 17% 4	420
May	1st to 10th	Day	3 16% 26% 31% 16% 7%	423
	11th to 20th	Day	14% 8% 21% 28% 20% 8%	448
	21st to end	Day	8% 5% 18% 32% 23% 14%	485
June	1st to 10th	Day	6% 7% 24% 32% 18% 13%	450
	11th to 20th	Day	7% 10% 28% 32% 18% 5%	450
	21st to end	Day	4 4 21% 37% 23% 11%	450
July	1st to 10th	Day	2 1 21% 42% 28% 7%	446
	11th to 20th	Day	2 19% 45% 28% 6%	444
	21st to end	Day	2 2 15% 41% 32% 8%	487
August	1st to 10th	Day	4 2 18% 35% 33% 8%	447
	11th to 20th	Day	1 2 16% 30% 37% 14%	437
	21st to end	Day	4 3 16% 36% 27% 15%	495
September	1st to 10th	Day	4 2 13% 31% 34% 16%	450
	11th to 20th	Day	5% 5% 14% 31% 28% 17%	450
	21st to end	Day	5% 4 17% 32% 30% 12%	450
October	1st to 10th	Day	8% 7% 19% 24% 25% 18%	450
	11th to 20th	Day	8% 6% 21% 26% 28% 11%	374
	21st to end	Day	10% 9% 22% 27% 24% 9%	297
November	1st to 10th	Day	12% 7% 24% 32% 20% 4	270
	11th to 20th	Day	9% 6% 20% 34% 23% 7%	270
	21st to end	Day	13% 3 19% 34% 26% 5%	239
December	1st to 10th	Day	19% 7% 20% 27% 16% 11%	180
	11th to 20th	Day	19% 6% 29% 27% 14% 4	180
	21st to end	Day	14% 12% 22% 32% 17% 4	198
January	1st to 10th	Night	17% 8% 23% 29% 19% 3	760
	11th to 20th	Night	13% 8% 23% 29% 23% 3	724
	21st to end	Night	16% 2 21% 33% 23% 5%	792
February	1st to 10th	Night	15% 6% 26% 35% 16% 2	720
	11th to 20th	Night	13% 4 26% 36% 19% 1	704
	21st to end	Night	13% 8% 30% 32% 15% 1	592
March	1st to 10th	Night	12% 8% 31% 33% 14% 2	720
	11th to 20th	Night	11% 8% 24% 38% 17% 2	720
	21st to end	Night	12% 11% 27% 36% 13% 1	792
April	1st to 10th	Night	12% 7% 26% 34% 19% 2	720
	11th to 20th	Night	11% 10% 26% 35% 16% 2	697
	21st to end	Night	8% 9% 27% 37% 18% 2	540
May	1st to 10th	Night	5% 9% 28% 36% 20% 2	540
	11th to 20th	Night	9% 7% 24% 31% 25% 4	422
	21st to end	Night	5% 7% 24% 37% 24% 4	389
June	1st to 10th	Night	9% 5% 23% 36% 24% 3	360
	11th to 20th	Night	7% 8% 29% 33% 21% 2	360
	21st to end	Night	2 3 25% 42% 28% 2	360
July	1st to 10th	Night	1 1 20% 47% 29% 1	350
	11th to 20th	Night	1 22% 56% 21%	348
	21st to end	Night	1 1 15% 52% 30% 1	394
August	1st to 10th	Night	2 2 13% 53% 28% 2	424
	11th to 20th	Night	1 2 12% 48% 35% 2	559
	21st to end	Night	2 3 14% 45% 31% 5%	792
September	1st to 10th	Night	3 2 14% 40% 37% 4	720
	11th to 20th	Night	5% 2 13% 37% 37% 6%	720
	21st to end	Night	7% 4 14% 37% 30% 9%	720
October	1st to 10th	Night	9% 4 18% 38% 27% 5%	720
	11th to 20th	Night	8% 4 19% 36% 28% 5%	720
	21st to end	Night	8% 5% 20% 39% 24% 4	792
November	1st to 10th	Night	14% 5% 21% 35% 24% 3	740
	11th to 20th	Night	16% 7% 21% 34% 19% 3	760
	21st to end	Night	13% 6% 22% 34% 22% 4	760
December	1st to 10th	Night	18% 6% 20% 37% 17% 3	760
	11th to 20th	Night	18% 6% 20% 38% 15% 2	760
	21st to end	Night	22% 7% 26% 33% 10% 1	836

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