Manic-5
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Manic-5 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	18% 13% 4 10% 6% 5% 5% 4 5% 6% 24%	101909
	Night	16% 14% 5% 11% 6% 6% 5% 4 5% 6% 23%	97129
Transparency	Day	60% 6% 11% 16% 8% 1	101648
	Night	60% 6% 12% 16% 7% 1	97012
Seeing	Day	27% 17% 29% 18% 7% 2	15892
	Night	24% 15% 31% 22% 8% 1	23662

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	11% 14% 5% 13% 9% 5% 5% 4 6% 5% 24%	2207
	11th to 20th	Day	8% 18% 7% 13% 8% 9% 6% 4 7% 6% 14%	2268
	21st to end	Day	6% 10% 5% 14% 6% 5% 5% 4 6% 6% 33%	2772
February	1st to 10th	Day	5% 12% 5% 10% 9% 8% 7% 4 7% 8% 24%	1529
	11th to 20th	Day	7% 17% 6% 12% 8% 6% 6% 5% 7% 6% 18%	1663
	21st to end	Day	6% 15% 5% 12% 10% 6% 7% 7% 6% 6% 20%	1541
March	1st to 10th	Day	13% 14% 5% 10% 6% 4 7% 4 5% 4 28%	3116
	11th to 20th	Day	15% 22% 6% 14% 7% 6% 5% 3 3 3 15%	3448
	21st to end	Day	17% 19% 7% 11% 5% 4 4 3 4 5% 22%	3873
April	1st to 10th	Day	16% 18% 6% 13% 6% 6% 4 3 3 3 23%	2333
	11th to 20th	Day	15% 14% 5% 10% 6% 5% 5% 4 5% 6% 27%	2442
	21st to end	Day	19% 15% 4 10% 6% 5% 3 2 4 5% 27%	2470
May	1st to 10th	Day	20% 18% 4 9% 5% 4 4 4 5% 4 24%	4293
	11th to 20th	Day	25% 9% 3 8% 5% 5% 5% 4 5% 6% 25%	4715
	21st to end	Day	25% 15% 3 8% 5% 4 4 4 4 5% 23%	5185
June	1st to 10th	Day	24% 10% 3 7% 5% 4 4 3 5% 5% 29%	2850
	11th to 20th	Day	20% 8% 3 8% 6% 5% 6% 5% 6% 6% 27%	2850
	21st to end	Day	28% 9% 3 8% 6% 4 5% 3 5% 5% 23%	2850
July	1st to 10th	Day	17% 8% 3 8% 5% 6% 5% 5% 6% 7% 31%	4760
	11th to 20th	Day	17% 7% 3 8% 6% 6% 7% 5% 7% 7% 27%	4760
	21st to end	Day	14% 7% 3 8% 6% 6% 7% 5% 7% 9% 28%	5037
August	1st to 10th	Day	18% 8% 3 9% 6% 7% 7% 5% 7% 7% 25%	4402
	11th to 20th	Day	19% 10% 4 10% 7% 6% 6% 5% 6% 6% 20%	4045
	21st to end	Day	18% 8% 3 8% 6% 5% 6% 4 5% 7% 30%	4532
September	1st to 10th	Day	21% 9% 3 9% 6% 4 5% 4 5% 6% 29%	2337
	11th to 20th	Day	29% 8% 3 7% 4 4 4 3 4 6% 27%	2090
	21st to end	Day	23% 12% 4 8% 6% 5% 5% 3 4 5% 27%	2090
October	1st to 10th	Day	23% 13% 3 9% 5% 6% 4 2 5% 5% 24%	1987
	11th to 20th	Day	28% 18% 5% 10% 5% 4 4 3 4 5% 16%	1777
	21st to end	Day	26% 20% 5% 10% 5% 5% 4 2 3 5% 16%	1881
November	1st to 10th	Day	18% 20% 8% 13% 7% 5% 4 4 4 3 12%	1565
	11th to 20th	Day	19% 20% 5% 14% 9% 5% 4 3 3 3 14%	1482
	21st to end	Day	15% 22% 8% 13% 7% 5% 4 3 3 5% 15%	1330
December	1st to 10th	Day	15% 16% 6% 16% 9% 6% 5% 3 4 5% 16%	1330
	11th to 20th	Day	15% 16% 6% 13% 8% 5% 5% 3 4 5% 18%	1668
	21st to end	Day	11% 16% 7% 13% 7% 7% 7% 4 4 5% 20%	2431
January	1st to 10th	Night	7% 17% 6% 16% 8% 8% 7% 4 5% 5% 16%	4748
	11th to 20th	Night	10% 16% 5% 15% 10% 8% 6% 4 6% 6% 13%	4696
	21st to end	Night	6% 10% 4 12% 7% 7% 8% 5% 7% 8% 27%	4884
February	1st to 10th	Night	6% 12% 4 12% 9% 8% 7% 5% 8% 7% 22%	2650
	11th to 20th	Night	8% 16% 6% 14% 8% 5% 6% 5% 7% 7% 18%	2403
	21st to end	Night	7% 15% 6% 11% 8% 5% 8% 6% 7% 7% 21%	1910
March	1st to 10th	Night	11% 13% 5% 11% 6% 6% 6% 5% 6% 5% 26%	3724
	11th to 20th	Night	14% 21% 6% 14% 8% 5% 5% 4 4 3 15%	3497
	21st to end	Night	16% 21% 6% 10% 6% 5% 5% 3 4 4 20%	3755
April	1st to 10th	Night	17% 16% 5% 11% 5% 5% 5% 4 5% 5% 23%	1846
	11th to 20th	Night	16% 12% 4 9% 6% 4 5% 3 4 5% 33%	1688
	21st to end	Night	19% 12% 4 9% 7% 5% 4 3 4 4 28%	1710
May	1st to 10th	Night	22% 20% 5% 9% 5% 5% 4 3 4 4 21%	2666
	11th to 20th	Night	22% 10% 3 8% 6% 5% 4 3 5% 6% 30%	2188
	21st to end	Night	24% 14% 4 8% 5% 4 4 4 5% 5% 23%	2401
June	1st to 10th	Night	20% 10% 2 8% 6% 5% 4 3 6% 7% 30%	1330
	11th to 20th	Night	20% 9% 3 7% 6% 5% 5% 5% 6% 6% 27%	1330
	21st to end	Night	25% 9% 3 6% 4 4 5% 4 6% 7% 26%	1330
July	1st to 10th	Night	16% 6% 2 6% 4 5% 6% 5% 10% 10% 29%	2210
	11th to 20th	Night	13% 6% 2 8% 6% 5% 6% 5% 8% 11% 30%	2210
	21st to end	Night	11% 5% 2 7% 4 6% 7% 6% 8% 10% 34%	2519
August	1st to 10th	Night	17% 8% 3 7% 4 5% 5% 4 7% 9% 32%	2506
	11th to 20th	Night	21% 9% 3 9% 6% 8% 7% 5% 6% 5% 22%	2773
	21st to end	Night	13% 6% 3 7% 5% 5% 4 4 6% 7% 40%	3124
September	1st to 10th	Night	22% 8% 3 7% 5% 4 5% 4 6% 6% 32%	1841
	11th to 20th	Night	23% 8% 3 8% 4 4 4 3 4 5% 32%	2090
	21st to end	Night	20% 10% 3 7% 5% 4 5% 4 5% 6% 32%	2090
October	1st to 10th	Night	21% 11% 3 9% 5% 5% 4 3 5% 5% 30%	2192
	11th to 20th	Night	26% 15% 4 11% 5% 4 3 3 4 5% 20%	2400
	21st to end	Night	26% 15% 5% 10% 5% 4 5% 3 4 5% 17%	2717
November	1st to 10th	Night	21% 17% 5% 12% 6% 5% 5% 4 5% 5% 16%	2536
	11th to 20th	Night	18% 19% 6% 13% 6% 5% 5% 3 5% 5% 15%	2698
	21st to end	Night	18% 19% 6% 15% 9% 6% 4 3 4 4 11%	2850
December	1st to 10th	Night	15% 17% 5% 14% 9% 6% 4 4 5% 4 17%	2850
	11th to 20th	Night	17% 15% 6% 12% 7% 6% 5% 4 5% 7% 17%	3531
	21st to end	Night	10% 19% 6% 12% 7% 6% 5% 4 5% 7% 17%	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	61% 4 10% 19% 5%	2208
	11th to 20th	Day	65% 4 12% 13% 5%	2268
	21st to end	Day	50% 4 9% 16% 19% 2	2772
February	1st to 10th	Day	56% 5% 9% 18% 13% 1	1529
	11th to 20th	Day	63% 4 10% 14% 9%	1671
	21st to end	Day	60% 4 8% 18% 9% 1	1541
March	1st to 10th	Day	59% 3 8% 22% 7% 1	3119
	11th to 20th	Day	75% 5% 4 9% 6% 1	3448
	21st to end	Day	65% 4 8% 12% 9% 3	3873
April	1st to 10th	Day	68% 4 6% 13% 10%	2333
	11th to 20th	Day	59% 4 8% 17% 11% 1	2442
	21st to end	Day	61% 4 9% 15% 10% 1	2470
May	1st to 10th	Day	61% 7% 8% 14% 9% 1	4307
	11th to 20th	Day	56% 7% 10% 18% 8% 1	4719
	21st to end	Day	62% 4 9% 15% 8%	5185
June	1st to 10th	Day	56% 6% 8% 18% 10% 3	2850
	11th to 20th	Day	55% 7% 10% 15% 11% 1	2850
	21st to end	Day	62% 6% 8% 15% 8% 1	2850
July	1st to 10th	Day	50% 6% 10% 23% 10%	4685
	11th to 20th	Day	52% 7% 15% 16% 10% 1	4679
	21st to end	Day	49% 8% 15% 20% 6% 1	4877
August	1st to 10th	Day	54% 8% 15% 17% 5%	4388
	11th to 20th	Day	61% 7% 14% 14% 3	4084
	21st to end	Day	53% 6% 14% 19% 8% 1	4532
September	1st to 10th	Day	55% 7% 14% 18% 6%	2337
	11th to 20th	Day	57% 5% 15% 19% 4	2090
	21st to end	Day	59% 5% 11% 19% 6%	2090
October	1st to 10th	Day	61% 6% 12% 14% 7%	1987
	11th to 20th	Day	71% 5% 11% 10% 3	1777
	21st to end	Day	73% 4 8% 10% 4 1	1881
November	1st to 10th	Day	75% 6% 9% 9% 1	1565
	11th to 20th	Day	75% 4 11% 10% 1	1482
	21st to end	Day	73% 4 11% 9% 2	1330
December	1st to 10th	Day	71% 4 14% 8% 2	1330
	11th to 20th	Day	67% 3 11% 14% 6%	1668
	21st to end	Day	64% 6% 6% 16% 6% 2	2431
January	1st to 10th	Night	67% 4 10% 14% 5%	4748
	11th to 20th	Night	67% 5% 12% 11% 5%	4696
	21st to end	Night	50% 7% 12% 17% 13% 2	4884
February	1st to 10th	Night	57% 4 9% 16% 11% 2	2650
	11th to 20th	Night	62% 4 9% 16% 8%	2406
	21st to end	Night	60% 3 11% 16% 9% 1	1910
March	1st to 10th	Night	57% 5% 10% 19% 9% 1	3734
	11th to 20th	Night	73% 4 7% 10% 6% 1	3498
	21st to end	Night	66% 4 6% 12% 10% 1	3755
April	1st to 10th	Night	62% 5% 8% 12% 12% 1	1846
	11th to 20th	Night	53% 5% 10% 17% 14% 2	1688
	21st to end	Night	59% 5% 9% 16% 11%	1710
May	1st to 10th	Night	65% 7% 8% 13% 7%	2672
	11th to 20th	Night	55% 5% 11% 19% 9%	2189
	21st to end	Night	61% 5% 9% 18% 6%	2402
June	1st to 10th	Night	53% 6% 10% 19% 10% 1	1330
	11th to 20th	Night	54% 8% 11% 14% 12% 1	1330
	21st to end	Night	56% 8% 10% 16% 11%	1330
July	1st to 10th	Night	44% 9% 18% 24% 5%	2175
	11th to 20th	Night	44% 7% 18% 22% 9%	2168
	21st to end	Night	41% 8% 19% 23% 8%	2439
August	1st to 10th	Night	47% 9% 21% 20% 3	2496
	11th to 20th	Night	60% 7% 17% 14% 2	2800
	21st to end	Night	41% 7% 15% 30% 7%	3124
September	1st to 10th	Night	50% 8% 15% 22% 5%	1841
	11th to 20th	Night	54% 5% 16% 19% 6%	2090
	21st to end	Night	51% 6% 13% 24% 5%	2090
October	1st to 10th	Night	56% 6% 13% 18% 6% 1	2192
	11th to 20th	Night	66% 5% 13% 12% 4	2400
	21st to end	Night	69% 4 10% 13% 3 1	2717
November	1st to 10th	Night	70% 5% 12% 10% 2	2536
	11th to 20th	Night	70% 5% 14% 10% 1	2698
	21st to end	Night	76% 4 11% 7% 2	2850
December	1st to 10th	Night	69% 4 13% 11% 3	2850
	11th to 20th	Night	66% 4 11% 14% 6%	3532
	21st to end	Night	64% 8% 7% 12% 7% 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	14% 17% 37% 23% 8% 1	180
	11th to 20th	Day	22% 14% 37% 18% 7% 2	180
	21st to end	Day	15% 22% 29% 23% 9% 2	198
February	1st to 10th	Day	15% 20% 39% 15% 8% 3	189
	11th to 20th	Day	14% 22% 36% 22% 5% 1	366
	21st to end	Day	21% 18% 38% 16% 5% 2	368
March	1st to 10th	Day	19% 22% 30% 21% 6% 2	460
	11th to 20th	Day	20% 18% 35% 19% 7% 2	460
	21st to end	Day	26% 23% 31% 14% 5% 1	506
April	1st to 10th	Day	27% 20% 34% 13% 4 1	460
	11th to 20th	Day	26% 20% 29% 16% 6% 3	452
	21st to end	Day	30% 20% 28% 14% 5% 2	460
May	1st to 10th	Day	33% 16% 24% 19% 7% 2	496
	11th to 20th	Day	26% 18% 25% 20% 9% 2	674
	21st to end	Day	34% 20% 25% 16% 5%	735
June	1st to 10th	Day	29% 15% 24% 23% 7% 1	680
	11th to 20th	Day	26% 17% 28% 19% 9% 1	680
	21st to end	Day	31% 16% 25% 20% 6% 2	680
July	1st to 10th	Day	24% 13% 28% 23% 10% 2	670
	11th to 20th	Day	24% 13% 29% 24% 8% 2	668
	21st to end	Day	22% 11% 30% 25% 10% 3	664
August	1st to 10th	Day	26% 11% 32% 18% 9% 3	486
	11th to 20th	Day	24% 11% 28% 24% 11% 2	479
	21st to end	Day	26% 14% 28% 18% 10% 5%	539
September	1st to 10th	Day	27% 19% 31% 15% 5% 3	490
	11th to 20th	Day	34% 15% 27% 13% 8% 3	490
	21st to end	Day	27% 20% 28% 17% 6% 2	490
October	1st to 10th	Day	28% 20% 29% 14% 7% 2	435
	11th to 20th	Day	42% 13% 23% 13% 6% 3	390
	21st to end	Day	34% 18% 24% 14% 8% 1	429
November	1st to 10th	Day	33% 26% 27% 10% 4 1	368
	11th to 20th	Day	32% 15% 30% 15% 6% 2	332
	21st to end	Day	24% 26% 36% 8% 7%	180
December	1st to 10th	Day	17% 16% 27% 24% 11% 5%	180
	11th to 20th	Day	23% 25% 32% 14% 4 1	180
	21st to end	Day	23% 21% 34% 14% 9%	198
January	1st to 10th	Night	17% 15% 35% 25% 8%	850
	11th to 20th	Night	22% 17% 32% 22% 7%	832
	21st to end	Night	14% 14% 36% 27% 8% 1	836
February	1st to 10th	Night	12% 17% 40% 21% 9% 1	760
	11th to 20th	Night	18% 17% 36% 22% 7%	743
	21st to end	Night	16% 15% 35% 22% 9% 3	628
March	1st to 10th	Night	15% 17% 36% 24% 7% 1	760
	11th to 20th	Night	20% 18% 32% 22% 7% 1	760
	21st to end	Night	22% 20% 32% 21% 6%	836
April	1st to 10th	Night	27% 15% 34% 19% 5%	706
	11th to 20th	Night	23% 18% 32% 18% 9% 1	564
	21st to end	Night	30% 14% 28% 20% 8% 1	570
May	1st to 10th	Night	30% 10% 29% 22% 7% 1	511
	11th to 20th	Night	25% 11% 32% 22% 9% 1	374
	21st to end	Night	26% 15% 37% 20% 2	411
June	1st to 10th	Night	24% 14% 30% 25% 7%	380
	11th to 20th	Night	24% 10% 34% 24% 8% 1	380
	21st to end	Night	28% 11% 27% 26% 7% 1	380
July	1st to 10th	Night	19% 9% 33% 30% 8% 1	370
	11th to 20th	Night	20% 10% 27% 30% 13% 1	368
	21st to end	Night	22% 9% 25% 31% 12% 1	416
August	1st to 10th	Night	24% 7% 26% 28% 15% 1	378
	11th to 20th	Night	27% 9% 25% 26% 12%	553
	21st to end	Night	25% 10% 27% 26% 11% 2	627
September	1st to 10th	Night	27% 13% 31% 22% 6%	658
	11th to 20th	Night	30% 15% 25% 22% 8% 1	760
	21st to end	Night	27% 16% 29% 21% 7% 1	760
October	1st to 10th	Night	29% 18% 29% 18% 6% 1	760
	11th to 20th	Night	33% 13% 24% 21% 7% 1	760
	21st to end	Night	36% 14% 26% 18% 7%	836
November	1st to 10th	Night	32% 19% 29% 15% 5%	800
	11th to 20th	Night	28% 18% 29% 18% 7% 1	850
	21st to end	Night	28% 17% 30% 19% 5%	850
December	1st to 10th	Night	25% 14% 30% 21% 8% 2	850
	11th to 20th	Night	22% 16% 34% 21% 6%	850
	21st to end	Night	22% 16% 31% 21% 8% 2	935

Page generated at 2024-10-30 01:23:00. Version ac07

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