Monte Cristo's Castle
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Monte Cristo's Castle clear sky chart from 2005-11-06 to 2024-12-06.

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	2 3 1 4 3 3 3 3 5% 6% 68%	105270
	Night	2 4 1 4 3 3 3 3 5% 6% 65%	103186
Transparency	Day	16% 4 6% 18% 26% 29%	105013
	Night	18% 5% 8% 21% 25% 23%	103033
Seeing	Day	4 9% 18% 29% 26% 15%	15165
	Night	3 4 17% 44% 29% 3	24729

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	1 5% 4 8% 4 5% 4 4 7% 10% 48%	2539
	11th to 20th	Day	1 5% 2 7% 5% 5% 6% 5% 6% 9% 47%	2540
	21st to end	Day	3 7% 2 7% 4 5% 5% 5% 8% 12% 43%	3081
February	1st to 10th	Day	2 5% 2 6% 3 2 3 3 6% 10% 58%	1900
	11th to 20th	Day	2 5% 2 4 4 3 3 4 6% 10% 57%	1850
	21st to end	Day	2 5% 2 5% 3 3 3 3 5% 8% 61%	1570
March	1st to 10th	Day	1 4 2 6% 4 3 4 4 7% 10% 54%	3138
	11th to 20th	Day	2 4 1 5% 4 3 4 3 5% 7% 62%	3259
	21st to end	Day	2 7% 3 6% 5% 4 5% 4 7% 8% 50%	4158
April	1st to 10th	Day	2 5% 1 4 4 3 4 3 5% 7% 62%	2280
	11th to 20th	Day	2 4 1 4 3 3 3 3 5% 6% 66%	2249
	21st to end	Day	1 4 1 3 3 3 3 3 5% 7% 66%	2304
May	1st to 10th	Day	2 3 1 3 2 2 3 2 4 5% 72%	4110
	11th to 20th	Day	2 3 1 3 3 3 3 2 4 5% 72%	4071
	21st to end	Day	2 3 1 3 3 2 3 3 4 5% 70%	4647
June	1st to 10th	Day	2 3 2 4 3 3 3 3 5% 7% 65%	2660
	11th to 20th	Day	3 2 1 2 2 2 2 2 4 5% 75%	2660
	21st to end	Day	2 2 1 2 2 2 2 2 3 3 77%	2660
July	1st to 10th	Day	1 2 1 2 2 1 2 2 3 3 82%	4420
	11th to 20th	Day	2 2 1 3 3 3 3 3 5% 5% 70%	4420
	21st to end	Day	2 2 1 3 3 3 3 4 5% 6% 69%	4735
August	1st to 10th	Day	3 2 1 3 2 2 2 1 3 3 79%	3886
	11th to 20th	Day	1 1 1 1 1 1 1 2 4 85%	3724
	21st to end	Day	1 1 1 1 1 2 2 2 3 85%	4180
September	1st to 10th	Day	1 1 2 2 2 2 2 4 4 79%	2280
	11th to 20th	Day	1 2 1 2 2 2 2 1 4 4 81%	2142
	21st to end	Day	2 1 1 1 1 1 2 2 2 4 83%	2090
October	1st to 10th	Day	1 2 1 2 2 2 2 2 4 5% 77%	3490
	11th to 20th	Day	1 1 1 3 2 2 2 2 3 5% 79%	3200
	21st to end	Day	1 2 1 3 2 2 2 2 4 6% 77%	3195
November	1st to 10th	Day	1 3 1 3 2 3 3 3 5% 8% 69%	1764
	11th to 20th	Day	1 2 1 2 2 2 3 3 4 8% 72%	1800
	21st to end	Day	2 4 2 4 3 3 4 3 5% 7% 65%	1800
December	1st to 10th	Day	2 4 1 4 3 3 4 3 4 7% 66%	1746
	11th to 20th	Day	3 8% 3 6% 5% 5% 6% 5% 7% 9% 43%	1928
	21st to end	Day	1 6% 3 7% 5% 6% 7% 6% 8% 10% 42%	2794
January	1st to 10th	Night	1 5% 3 9% 5% 4 4 4 5% 8% 52%	4406
	11th to 20th	Night	1 6% 3 8% 5% 4 5% 4 6% 9% 48%	4420
	21st to end	Night	4 7% 2 6% 4 4 5% 5% 6% 10% 46%	4579
February	1st to 10th	Night	2 5% 2 5% 4 3 3 2 4 7% 63%	2280
	11th to 20th	Night	2 4 1 3 3 3 4 3 6% 8% 63%	2218
	21st to end	Night	1 4 2 6% 3 3 3 3 6% 8% 61%	1884
March	1st to 10th	Night	2 4 2 6% 3 4 4 4 6% 7% 60%	3736
	11th to 20th	Night	2 5% 2 5% 3 4 4 4 5% 8% 58%	3721
	21st to end	Night	2 5% 2 5% 3 3 4 4 6% 8% 58%	3491
April	1st to 10th	Night	3 5% 1 3 2 3 4 3 5% 6% 65%	1900
	11th to 20th	Night	2 4 1 4 3 2 3 3 5% 6% 68%	1879
	21st to end	Night	4 5% 1 3 2 3 3 3 4 6% 66%	1874
May	1st to 10th	Night	5% 4 1 4 3 2 2 2 4 5% 69%	2860
	11th to 20th	Night	4 4 1 4 3 3 4 3 4 5% 65%	2834
	21st to end	Night	4 3 2 4 2 3 3 3 3 5% 68%	2929
June	1st to 10th	Night	3 2 1 3 3 3 4 4 5% 8% 65%	1520
	11th to 20th	Night	2 3 1 3 3 3 3 2 4 5% 72%	1520
	21st to end	Night	2 2 1 3 2 2 2 2 4 4 77%	1520
July	1st to 10th	Night	1 1 1 2 2 2 2 2 3 4 79%	2540
	11th to 20th	Night	4 4 1 5% 4 4 4 4 5% 6% 59%	2540
	21st to end	Night	4 3 1 4 4 3 4 3 5% 6% 63%	2818
August	1st to 10th	Night	4 4 1 4 3 3 3 3 3 5% 67%	3057
	11th to 20th	Night	2 1 1 2 2 2 2 2 3 4 80%	3126
	21st to end	Night	1 1 2 2 2 2 2 2 3 83%	3498
September	1st to 10th	Night	2 1 1 3 2 2 3 2 3 5% 76%	1900
	11th to 20th	Night	1 2 1 4 2 2 3 2 3 5% 75%	2037
	21st to end	Night	2 2 2 2 1 2 2 3 4 81%	2090
October	1st to 10th	Night	3 2 1 2 2 2 2 2 4 4 75%	3490
	11th to 20th	Night	1 1 1 2 1 1 2 2 3 5% 80%	3736
	21st to end	Night	1 2 1 2 2 2 2 2 3 4 79%	4365
November	1st to 10th	Night	2 3 1 3 1 1 2 2 4 7% 75%	2535
	11th to 20th	Night	1 3 1 2 2 1 3 3 4 6% 72%	2600
	21st to end	Night	2 3 2 4 3 3 3 3 4 7% 66%	2600
December	1st to 10th	Night	2 4 2 5% 3 3 3 3 6% 7% 61%	2545
	11th to 20th	Night	3 9% 2 6% 4 4 5% 4 7% 12% 44%	3276
	21st to end	Night	2 5% 3 8% 6% 5% 7% 6% 8% 10% 41%	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	23% 8% 19% 34% 15% 1	2539
	11th to 20th	Day	28% 8% 18% 28% 14% 4	2540
	21st to end	Day	29% 7% 20% 27% 15% 2	3081
February	1st to 10th	Day	21% 5% 12% 31% 23% 8%	1900
	11th to 20th	Day	21% 5% 9% 31% 28% 7%	1860
	21st to end	Day	19% 5% 11% 33% 26% 6%	1570
March	1st to 10th	Day	21% 7% 8% 31% 26% 8%	3138
	11th to 20th	Day	19% 5% 11% 33% 25% 7%	3259
	21st to end	Day	22% 11% 10% 28% 22% 7%	4158
April	1st to 10th	Day	20% 5% 8% 27% 25% 15%	2280
	11th to 20th	Day	18% 4 9% 21% 31% 18%	2252
	21st to end	Day	16% 5% 6% 27% 33% 12%	2304
May	1st to 10th	Day	13% 4 4 21% 38% 20%	4110
	11th to 20th	Day	13% 4 4 15% 37% 27%	4074
	21st to end	Day	14% 5% 4 18% 38% 21%	4647
June	1st to 10th	Day	18% 4 6% 15% 30% 27%	2660
	11th to 20th	Day	13% 3 3 10% 31% 41%	2660
	21st to end	Day	12% 2 2 6% 21% 57%	2660
July	1st to 10th	Day	9% 2 1 4 9% 74%	4351
	11th to 20th	Day	14% 4 2 7% 14% 59%	4345
	21st to end	Day	15% 4 3 14% 19% 45%	4585
August	1st to 10th	Day	12% 2 2 7% 23% 53%	3872
	11th to 20th	Day	6% 2 2 5% 12% 73%	3760
	21st to end	Day	7% 2 1 5% 22% 63%	4179
September	1st to 10th	Day	9% 4 3 7% 23% 55%	2280
	11th to 20th	Day	9% 2 2 13% 31% 43%	2142
	21st to end	Day	7% 2 2 12% 35% 42%	2090
October	1st to 10th	Day	10% 3 3 11% 34% 39%	3490
	11th to 20th	Day	10% 2 2 12% 44% 30%	3200
	21st to end	Day	11% 3 2 23% 46% 16%	3195
November	1st to 10th	Day	14% 4 8% 29% 32% 13%	1764
	11th to 20th	Day	12% 4 9% 31% 36% 7%	1800
	21st to end	Day	18% 4 10% 28% 31% 10%	1800
December	1st to 10th	Day	19% 5% 13% 30% 25% 7%	1746
	11th to 20th	Day	32% 9% 11% 29% 15% 4	1928
	21st to end	Day	30% 10% 20% 22% 16% 2	2794
January	1st to 10th	Night	25% 7% 19% 32% 15% 2	4406
	11th to 20th	Night	28% 8% 18% 28% 14% 4	4420
	21st to end	Night	29% 8% 18% 28% 14% 2	4579
February	1st to 10th	Night	23% 4 12% 29% 23% 9%	2280
	11th to 20th	Night	18% 5% 10% 30% 30% 8%	2219
	21st to end	Night	20% 6% 10% 34% 24% 7%	1884
March	1st to 10th	Night	19% 7% 8% 28% 28% 10%	3736
	11th to 20th	Night	21% 7% 11% 29% 24% 7%	3721
	21st to end	Night	18% 9% 11% 34% 24% 4	3491
April	1st to 10th	Night	19% 4 10% 29% 25% 12%	1900
	11th to 20th	Night	17% 5% 7% 27% 30% 15%	1879
	21st to end	Night	18% 5% 7% 26% 33% 11%	1874
May	1st to 10th	Night	17% 4 4 23% 38% 14%	2860
	11th to 20th	Night	17% 7% 5% 16% 32% 23%	2835
	21st to end	Night	16% 7% 6% 15% 41% 15%	2929
June	1st to 10th	Night	16% 3 7% 17% 31% 25%	1520
	11th to 20th	Night	15% 4 3 11% 29% 39%	1520
	21st to end	Night	11% 2 3 7% 24% 53%	1520
July	1st to 10th	Night	10% 3 2 5% 8% 71%	2500
	11th to 20th	Night	22% 7% 3 7% 14% 48%	2492
	21st to end	Night	20% 5% 4 13% 13% 45%	2730
August	1st to 10th	Night	20% 4 2 10% 23% 42%	3048
	11th to 20th	Night	9% 3 3 4 12% 68%	3156
	21st to end	Night	8% 4 2 6% 18% 63%	3498
September	1st to 10th	Night	11% 3 2 9% 22% 52%	1900
	11th to 20th	Night	12% 3 4 12% 26% 42%	2037
	21st to end	Night	9% 2 2 10% 34% 43%	2090
October	1st to 10th	Night	13% 3 3 10% 31% 40%	3490
	11th to 20th	Night	9% 2 2 14% 40% 32%	3736
	21st to end	Night	11% 3 2 17% 44% 23%	4365
November	1st to 10th	Night	11% 3 8% 29% 33% 16%	2535
	11th to 20th	Night	13% 4 8% 30% 33% 12%	2600
	21st to end	Night	18% 3 7% 27% 34% 11%	2600
December	1st to 10th	Night	20% 6% 12% 29% 24% 9%	2545
	11th to 20th	Night	29% 6% 15% 27% 19% 3	3276
	21st to end	Night	31% 9% 16% 25% 16% 3	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	5% 5% 15% 46% 22% 7%	180
	11th to 20th	Day	2 6% 16% 38% 22% 16%	180
	21st to end	Day	4 8% 15% 27% 30% 15%	360
February	1st to 10th	Day	5% 10% 19% 35% 21% 10%	460
	11th to 20th	Day	5% 12% 20% 33% 22% 9%	455
	21st to end	Day	5% 13% 19% 38% 19% 5%	382
March	1st to 10th	Day	6% 15% 22% 33% 19% 5%	460
	11th to 20th	Day	6% 15% 23% 30% 20% 6%	460
	21st to end	Day	9% 17% 26% 30% 14% 3	506
April	1st to 10th	Day	8% 17% 21% 24% 20% 10%	460
	11th to 20th	Day	7% 17% 26% 26% 19% 5%	452
	21st to end	Day	6% 17% 24% 26% 16% 11%	460
May	1st to 10th	Day	6% 15% 27% 26% 17% 9%	463
	11th to 20th	Day	7% 13% 21% 26% 20% 13%	488
	21st to end	Day	7% 11% 18% 24% 24% 16%	529
June	1st to 10th	Day	5% 9% 18% 24% 24% 20%	490
	11th to 20th	Day	5% 11% 19% 27% 24% 14%	490
	21st to end	Day	3 6% 15% 28% 33% 16%	490
July	1st to 10th	Day	3 3 15% 28% 30% 20%	486
	11th to 20th	Day	2 3 13% 22% 33% 26%	484
	21st to end	Day	2 2 13% 27% 30% 25%	531
August	1st to 10th	Day	3 2 17% 33% 29% 16%	487
	11th to 20th	Day	1 3 17% 26% 28% 25%	477
	21st to end	Day	3 3 14% 24% 33% 23%	539
September	1st to 10th	Day	1 3 14% 28% 28% 25%	490
	11th to 20th	Day	4 5% 19% 29% 27% 16%	490
	21st to end	Day	2 6% 14% 24% 36% 17%	490
October	1st to 10th	Day	3 7% 18% 25% 26% 20%	490
	11th to 20th	Day	2 8% 14% 27% 30% 19%	490
	21st to end	Day	3 5% 14% 28% 29% 21%	387
November	1st to 10th	Day	1 4 13% 36% 28% 18%	300
	11th to 20th	Day	1 5% 12% 35% 26% 21%	300
	21st to end	Day	3 3 15% 32% 32% 15%	300
December	1st to 10th	Day	4 2 13% 37% 30% 14%	281
	11th to 20th	Day	3 7% 15% 31% 33% 12%	180
	21st to end	Day	4 7% 16% 38% 29% 8%	198
January	1st to 10th	Night	5% 2 18% 46% 25% 5%	760
	11th to 20th	Night	2 2 17% 50% 24% 4	760
	21st to end	Night	4 3 17% 47% 26% 3	836
February	1st to 10th	Night	4 3 19% 45% 25% 3	760
	11th to 20th	Night	3 4 18% 48% 24% 2	744
	21st to end	Night	3 4 23% 52% 17% 2	628
March	1st to 10th	Night	4 5% 22% 47% 20% 2	760
	11th to 20th	Night	3 5% 19% 46% 23% 3	760
	21st to end	Night	4 8% 27% 42% 19% 1	836
April	1st to 10th	Night	4 8% 24% 43% 20% 1	760
	11th to 20th	Night	4 9% 24% 42% 19% 3	751
	21st to end	Night	5% 7% 24% 40% 20% 3	734
May	1st to 10th	Night	7% 11% 28% 37% 16% 1	570
	11th to 20th	Night	5% 7% 24% 39% 25% 1	561
	21st to end	Night	6% 8% 21% 39% 23% 3	514
June	1st to 10th	Night	2 5% 15% 44% 31% 3	380
	11th to 20th	Night	3 4 18% 49% 26% 1	380
	21st to end	Night	2 1 12% 57% 28%	380
July	1st to 10th	Night	2 8% 50% 39% 1	370
	11th to 20th	Night	4 7% 43% 45% 1	368
	21st to end	Night	5% 1 6% 43% 43% 2	449
August	1st to 10th	Night	6% 2 14% 42% 36% 1	686
	11th to 20th	Night	2 1 12% 39% 42% 4	752
	21st to end	Night	2 1 10% 40% 44% 3	836
September	1st to 10th	Night	3 2 9% 38% 44% 4	760
	11th to 20th	Night	2 2 14% 39% 38% 5%	760
	21st to end	Night	1 3 11% 38% 43% 4	760
October	1st to 10th	Night	3 2 15% 40% 35% 5%	760
	11th to 20th	Night	3 2 13% 42% 36% 4	760
	21st to end	Night	2 2 16% 38% 34% 8%	836
November	1st to 10th	Night	2 2 14% 42% 35% 5%	780
	11th to 20th	Night	2 1 14% 50% 29% 4	800
	21st to end	Night	3 1 17% 46% 28% 5%	800
December	1st to 10th	Night	3 2 15% 54% 21% 5%	782
	11th to 20th	Night	5% 3 17% 51% 21% 3	760
	21st to end	Night	4 2 22% 51% 19% 2	836

Page generated at 2024-12-03 03:45:08. Version ac07

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