Phoenicia
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Phoenicia clear sky chart from 2005-11-06 to 2024-02-25.

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	15% 8% 3 7% 6% 4 5% 5% 5% 7% 33%	78328
	Night	15% 8% 3 7% 6% 3 5% 5% 5% 7% 36%	80968
Transparency	Day	46% 9% 13% 19% 11% 2	78033
	Night	45% 9% 14% 19% 11% 1	80797
Seeing	Day	20% 20% 30% 19% 8% 2	13856
	Night	19% 17% 31% 23% 8% 1	23134

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	12% 10% 5% 7% 7% 3 5% 5% 6% 8% 34%	2517
	11th to 20th	Day	11% 11% 6% 12% 9% 4 5% 5% 5% 5% 26%	2520
	21st to end	Day	14% 12% 7% 11% 8% 3 4 5% 3 5% 27%	2961
February	1st to 10th	Day	12% 11% 5% 9% 8% 4 6% 6% 5% 7% 28%	1710
	11th to 20th	Day	10% 9% 3 7% 7% 3 4 5% 6% 8% 37%	1809
	21st to end	Day	16% 12% 4 7% 6% 4 4 4 4 6% 32%	1520
March	1st to 10th	Day	11% 8% 4 9% 8% 4 5% 5% 5% 7% 36%	1797
	11th to 20th	Day	13% 10% 4 8% 7% 4 6% 4 4 6% 33%	1908
	21st to end	Day	17% 9% 4 6% 7% 3 4 3 4 6% 36%	2347
April	1st to 10th	Day	14% 11% 4 8% 7% 3 5% 5% 5% 5% 33%	2160
	11th to 20th	Day	14% 9% 4 7% 6% 3 6% 4 5% 5% 38%	2134
	21st to end	Day	18% 10% 4 7% 6% 3 4 5% 4 6% 34%	2200
May	1st to 10th	Day	23% 10% 4 6% 6% 4 4 4 4 5% 29%	2391
	11th to 20th	Day	19% 6% 3 6% 6% 3 6% 5% 6% 6% 35%	2478
	21st to end	Day	14% 7% 3 6% 6% 4 5% 5% 5% 8% 36%	2725
June	1st to 10th	Day	17% 6% 4 6% 6% 4 6% 6% 6% 9% 30%	2520
	11th to 20th	Day	17% 5% 2 6% 7% 3 6% 7% 7% 8% 31%	2520
	21st to end	Day	17% 6% 3 6% 6% 4 5% 6% 7% 9% 32%	2520
July	1st to 10th	Day	13% 5% 3 7% 7% 4 6% 6% 6% 8% 33%	2520
	11th to 20th	Day	12% 5% 2 6% 6% 3 6% 7% 7% 9% 35%	2520
	21st to end	Day	14% 6% 3 7% 6% 3 6% 7% 6% 8% 34%	2744
August	1st to 10th	Day	12% 6% 3 6% 6% 5% 7% 6% 7% 9% 34%	2443
	11th to 20th	Day	14% 7% 3 6% 6% 4 7% 7% 7% 8% 31%	2134
	21st to end	Day	15% 5% 2 5% 5% 4 6% 6% 7% 10% 36%	2376
September	1st to 10th	Day	16% 6% 3 6% 5% 4 5% 5% 5% 7% 39%	2160
	11th to 20th	Day	14% 5% 2 5% 5% 3 4 5% 5% 7% 44%	2098
	21st to end	Day	18% 6% 2 5% 5% 3 4 5% 5% 8% 40%	1980
October	1st to 10th	Day	19% 8% 3 5% 6% 3 5% 4 4 7% 36%	1851
	11th to 20th	Day	15% 8% 2 4 6% 5% 4 5% 6% 7% 38%	1800
	21st to end	Day	21% 8% 3 7% 6% 4 7% 5% 5% 7% 29%	1828
November	1st to 10th	Day	12% 8% 3 6% 6% 3 4 3 5% 7% 44%	1671
	11th to 20th	Day	16% 8% 4 7% 6% 4 5% 5% 5% 6% 35%	1710
	21st to end	Day	16% 8% 3 6% 7% 4 5% 5% 5% 7% 33%	1558
December	1st to 10th	Day	14% 12% 5% 9% 8% 5% 5% 5% 5% 6% 26%	1520
	11th to 20th	Day	19% 9% 3 7% 6% 3 4 5% 4 8% 34%	1906
	21st to end	Day	16% 12% 5% 10% 7% 4 5% 5% 6% 7% 23%	2772
January	1st to 10th	Night	14% 9% 3 6% 5% 4 5% 5% 5% 8% 37%	4429
	11th to 20th	Night	12% 12% 6% 11% 7% 3 5% 5% 5% 5% 28%	4440
	21st to end	Night	16% 12% 5% 8% 7% 4 5% 5% 5% 6% 28%	4692
February	1st to 10th	Night	13% 10% 4 7% 7% 4 6% 4 5% 7% 33%	2470
	11th to 20th	Night	11% 8% 4 8% 8% 4 5% 5% 7% 7% 34%	2256
	21st to end	Night	16% 8% 4 8% 6% 3 5% 4 5% 6% 35%	1831
March	1st to 10th	Night	13% 10% 3 7% 5% 2 4 4 7% 9% 37%	2150
	11th to 20th	Night	13% 8% 3 6% 7% 4 6% 5% 6% 7% 35%	2048
	21st to end	Night	14% 9% 3 5% 5% 3 4 5% 5% 8% 38%	2008
April	1st to 10th	Night	13% 10% 3 7% 7% 4 7% 5% 7% 7% 30%	1800
	11th to 20th	Night	16% 7% 3 6% 5% 3 5% 5% 5% 7% 36%	1775
	21st to end	Night	19% 7% 3 7% 5% 3 5% 4 6% 6% 36%	1760
May	1st to 10th	Night	22% 9% 3 7% 6% 3 4 4 4 6% 33%	1584
	11th to 20th	Night	16% 7% 3 6% 5% 4 5% 5% 5% 6% 37%	1415
	21st to end	Night	14% 6% 2 5% 5% 4 4 5% 6% 8% 40%	1550
June	1st to 10th	Night	16% 6% 3 5% 5% 3 5% 4 5% 7% 42%	1440
	11th to 20th	Night	16% 5% 3 5% 5% 3 5% 4 5% 10% 39%	1440
	21st to end	Night	12% 4 1 4 4 3 5% 5% 5% 10% 46%	1440
July	1st to 10th	Night	12% 5% 2 4 5% 4 5% 5% 5% 7% 45%	1440
	11th to 20th	Night	12% 6% 2 6% 4 3 5% 5% 6% 11% 41%	1440
	21st to end	Night	12% 6% 2 5% 4 4 5% 5% 6% 8% 44%	1574
August	1st to 10th	Night	11% 4 2 5% 5% 3 5% 5% 6% 9% 44%	1492
	11th to 20th	Night	13% 7% 2 6% 6% 3 5% 5% 6% 7% 40%	1748
	21st to end	Night	17% 4 2 5% 4 2 4 4 5% 8% 43%	1980
September	1st to 10th	Night	15% 6% 2 5% 5% 3 5% 4 4 9% 44%	1800
	11th to 20th	Night	15% 5% 2 3 4 2 3 3 4 7% 52%	1862
	21st to end	Night	16% 7% 2 6% 5% 2 3 4 4 7% 44%	1980
October	1st to 10th	Night	20% 7% 3 6% 5% 3 4 4 6% 5% 38%	2106
	11th to 20th	Night	18% 6% 2 6% 5% 3 4 4 5% 8% 40%	2160
	21st to end	Night	22% 8% 3 6% 5% 3 4 5% 5% 8% 31%	2528
November	1st to 10th	Night	11% 8% 3 7% 6% 3 5% 5% 5% 6% 43%	2407
	11th to 20th	Night	18% 8% 3 5% 5% 3 4 4 6% 8% 36%	2470
	21st to end	Night	13% 8% 3 6% 5% 3 5% 6% 6% 9% 37%	2621
December	1st to 10th	Night	15% 9% 4 7% 6% 4 6% 6% 6% 8% 29%	2660
	11th to 20th	Night	17% 9% 3 6% 7% 3 5% 5% 6% 7% 31%	3288
	21st to end	Night	18% 12% 4 9% 6% 4 5% 5% 5% 6% 27%	4884

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	43% 13% 14% 21% 7% 2	2518
	11th to 20th	Day	54% 11% 11% 16% 6% 1	2520
	21st to end	Day	57% 9% 9% 17% 6% 1	2961
February	1st to 10th	Day	52% 10% 12% 15% 9% 1	1710
	11th to 20th	Day	45% 9% 11% 21% 12% 2	1818
	21st to end	Day	50% 8% 11% 17% 12% 2	1520
March	1st to 10th	Day	46% 8% 14% 19% 11% 3	1800
	11th to 20th	Day	49% 9% 9% 19% 12% 2	1908
	21st to end	Day	49% 6% 11% 15% 15% 5%	2347
April	1st to 10th	Day	50% 7% 10% 19% 11% 3	2160
	11th to 20th	Day	45% 8% 12% 20% 14% 2	2134
	21st to end	Day	49% 7% 12% 16% 13% 3	2200
May	1st to 10th	Day	55% 7% 9% 17% 11% 2	2391
	11th to 20th	Day	44% 10% 11% 21% 12% 2	2482
	21st to end	Day	43% 11% 14% 20% 10% 2	2725
June	1st to 10th	Day	46% 11% 15% 17% 11% 1	2520
	11th to 20th	Day	45% 10% 15% 19% 9% 1	2520
	21st to end	Day	45% 10% 14% 20% 9% 1	2520
July	1st to 10th	Day	44% 11% 12% 18% 13% 1	2450
	11th to 20th	Day	40% 11% 16% 21% 11%	2445
	21st to end	Day	44% 9% 14% 19% 12% 2	2591
August	1st to 10th	Day	40% 12% 15% 20% 11% 1	2429
	11th to 20th	Day	44% 12% 16% 21% 7%	2134
	21st to end	Day	40% 10% 13% 23% 13% 1	2376
September	1st to 10th	Day	43% 9% 13% 22% 13% 1	2160
	11th to 20th	Day	36% 8% 13% 21% 21% 1	2098
	21st to end	Day	40% 8% 14% 20% 16% 3	1980
October	1st to 10th	Day	45% 9% 11% 19% 13% 2	1851
	11th to 20th	Day	41% 9% 15% 22% 12% 1	1800
	21st to end	Day	51% 10% 12% 14% 10% 3	1828
November	1st to 10th	Day	40% 7% 14% 22% 14% 3	1671
	11th to 20th	Day	45% 8% 15% 16% 14% 2	1710
	21st to end	Day	48% 9% 15% 20% 7% 1	1558
December	1st to 10th	Day	55% 11% 11% 13% 9% 1	1520
	11th to 20th	Day	48% 8% 18% 18% 7% 1	1906
	21st to end	Day	54% 14% 11% 13% 9%	2772
January	1st to 10th	Night	43% 10% 14% 21% 10% 2	4429
	11th to 20th	Night	52% 10% 15% 14% 7% 2	4440
	21st to end	Night	56% 10% 10% 15% 7% 1	4692
February	1st to 10th	Night	48% 10% 14% 17% 9% 2	2470
	11th to 20th	Night	46% 8% 16% 15% 13% 2	2258
	21st to end	Night	47% 7% 13% 19% 10% 3	1831
March	1st to 10th	Night	42% 10% 15% 19% 12% 2	2160
	11th to 20th	Night	46% 9% 13% 19% 12% 2	2049
	21st to end	Night	45% 8% 12% 18% 15% 3	2008
April	1st to 10th	Night	50% 8% 13% 18% 11% 2	1800
	11th to 20th	Night	45% 7% 13% 19% 15% 1	1775
	21st to end	Night	46% 9% 11% 19% 12% 3	1760
May	1st to 10th	Night	53% 7% 9% 16% 13% 2	1584
	11th to 20th	Night	44% 8% 12% 20% 14% 2	1416
	21st to end	Night	40% 11% 16% 21% 11% 1	1551
June	1st to 10th	Night	41% 8% 13% 23% 13% 1	1440
	11th to 20th	Night	39% 11% 17% 22% 10%	1440
	21st to end	Night	34% 11% 16% 25% 13% 1	1440
July	1st to 10th	Night	36% 9% 15% 24% 13% 2	1400
	11th to 20th	Night	36% 11% 17% 27% 9% 1	1392
	21st to end	Night	35% 11% 17% 21% 15% 2	1486
August	1st to 10th	Night	34% 11% 17% 26% 11% 1	1482
	11th to 20th	Night	40% 11% 18% 22% 10%	1748
	21st to end	Night	38% 8% 14% 24% 15% 1	1980
September	1st to 10th	Night	39% 9% 14% 25% 14% 1	1800
	11th to 20th	Night	32% 7% 13% 23% 24% 1	1862
	21st to end	Night	38% 8% 12% 22% 19% 1	1980
October	1st to 10th	Night	46% 9% 12% 19% 13% 2	2106
	11th to 20th	Night	41% 10% 15% 22% 12% 1	2160
	21st to end	Night	49% 10% 13% 18% 9% 1	2528
November	1st to 10th	Night	40% 9% 13% 19% 16% 3	2407
	11th to 20th	Night	44% 8% 16% 17% 12% 3	2470
	21st to end	Night	41% 10% 18% 22% 8% 1	2621
December	1st to 10th	Night	48% 11% 17% 17% 8%	2660
	11th to 20th	Night	48% 10% 16% 13% 11% 1	3288
	21st to end	Night	53% 12% 12% 15% 8%	4884

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	22% 31% 29% 15% 3 1	180
	11th to 20th	Day	24% 35% 29% 9% 1 1	180
	21st to end	Day	16% 35% 35% 10% 4	251
February	1st to 10th	Day	31% 30% 32% 6% 1	270
	11th to 20th	Day	25% 36% 29% 10% 1	417
	21st to end	Day	28% 27% 32% 11% 2	362
March	1st to 10th	Day	22% 28% 34% 14% 2	420
	11th to 20th	Day	23% 31% 30% 13% 2 1	420
	21st to end	Day	30% 27% 24% 12% 5% 2	462
April	1st to 10th	Day	28% 26% 26% 13% 6% 1	420
	11th to 20th	Day	22% 29% 29% 12% 7% 2	412
	21st to end	Day	29% 23% 31% 10% 5% 2	420
May	1st to 10th	Day	31% 22% 26% 12% 6% 2	423
	11th to 20th	Day	20% 18% 36% 18% 5% 2	447
	21st to end	Day	19% 13% 28% 24% 13% 3	485
June	1st to 10th	Day	17% 18% 33% 20% 10% 2	450
	11th to 20th	Day	16% 15% 34% 24% 10% 2	450
	21st to end	Day	17% 16% 30% 24% 12% 1	450
July	1st to 10th	Day	13% 11% 27% 29% 17% 2	445
	11th to 20th	Day	11% 7% 34% 33% 13% 3	444
	21st to end	Day	15% 10% 34% 29% 10% 3	488
August	1st to 10th	Day	9% 11% 28% 32% 15% 5%	446
	11th to 20th	Day	15% 9% 26% 29% 14% 7%	439
	21st to end	Day	13% 13% 29% 25% 14% 7%	495
September	1st to 10th	Day	18% 13% 23% 24% 16% 6%	450
	11th to 20th	Day	15% 12% 30% 20% 14% 10%	450
	21st to end	Day	19% 12% 27% 26% 11% 5%	450
October	1st to 10th	Day	27% 14% 22% 22% 12% 4	450
	11th to 20th	Day	17% 21% 29% 25% 8% 1	450
	21st to end	Day	23% 23% 30% 18% 5%	419
November	1st to 10th	Day	18% 22% 28% 22% 8% 1	365
	11th to 20th	Day	25% 26% 28% 15% 5% 1	370
	21st to end	Day	21% 28% 33% 17% 1	218
December	1st to 10th	Day	23% 35% 27% 8% 6%	180
	11th to 20th	Day	27% 32% 30% 9% 2	180
	21st to end	Day	22% 30% 37% 8% 2 1	198
January	1st to 10th	Night	17% 24% 41% 15% 2	760
	11th to 20th	Night	21% 23% 36% 17% 3	760
	21st to end	Night	16% 24% 38% 20% 2	836
February	1st to 10th	Night	19% 24% 41% 15% 1	760
	11th to 20th	Night	18% 30% 38% 14% 1	743
	21st to end	Night	23% 25% 33% 16% 3	611
March	1st to 10th	Night	22% 24% 35% 16% 3	720
	11th to 20th	Night	22% 23% 33% 17% 3 1	720
	21st to end	Night	21% 24% 32% 17% 5% 1	792
April	1st to 10th	Night	21% 26% 30% 19% 4	720
	11th to 20th	Night	20% 21% 33% 19% 6%	711
	21st to end	Night	24% 20% 27% 23% 7%	680
May	1st to 10th	Night	27% 18% 25% 21% 9% 1	504
	11th to 20th	Night	19% 12% 35% 29% 5% 1	354
	21st to end	Night	17% 8% 26% 33% 15% 1	389
June	1st to 10th	Night	17% 9% 29% 29% 15%	360
	11th to 20th	Night	19% 8% 24% 34% 14% 1	360
	21st to end	Night	13% 5% 26% 42% 14% 1	360
July	1st to 10th	Night	15% 5% 20% 40% 18% 1	350
	11th to 20th	Night	15% 3 23% 40% 17% 1	348
	21st to end	Night	13% 5% 21% 43% 17% 1	394
August	1st to 10th	Night	11% 2 25% 39% 21% 2	418
	11th to 20th	Night	14% 6% 19% 36% 22% 3	684
	21st to end	Night	17% 6% 20% 34% 22% 2	792
September	1st to 10th	Night	15% 6% 29% 31% 16% 2	720
	11th to 20th	Night	17% 9% 26% 24% 18% 7%	720
	21st to end	Night	19% 10% 24% 29% 15% 3	720
October	1st to 10th	Night	24% 12% 24% 24% 13% 3	720
	11th to 20th	Night	21% 14% 30% 27% 8% 1	720
	21st to end	Night	28% 15% 33% 20% 5%	792
November	1st to 10th	Night	16% 20% 31% 24% 8% 1	740
	11th to 20th	Night	23% 21% 29% 19% 7% 1	760
	21st to end	Night	18% 21% 34% 22% 5% 1	760
December	1st to 10th	Night	22% 24% 34% 15% 5%	760
	11th to 20th	Night	22% 22% 33% 20% 3	760
	21st to end	Night	22% 23% 38% 15% 2	836

Page generated at 2024-02-22 06:05:47. Version ac07

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