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 2026-08-30.

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 8% 5% 5% 5% 4 6% 8% 33%	144231
	Night	14% 8% 3 8% 5% 5% 5% 4 6% 7% 35%	138006
Transparency	Day	44% 8% 13% 20% 12% 2	147721
	Night	43% 8% 14% 20% 13% 2	142592
Seeing	Day	22% 21% 29% 18% 7% 2	17169
	Night	21% 18% 30% 23% 8% 1	26212

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	8% 9% 4 15% 6% 5% 5% 4 6% 9% 28%	4661
	11th to 20th	Day	9% 12% 5% 12% 7% 5% 5% 4 6% 7% 28%	4650
	21st to end	Day	10% 10% 6% 10% 6% 4 4 4 4 6% 35%	5479
February	1st to 10th	Day	11% 11% 4 10% 8% 5% 5% 5% 5% 7% 29%	1890
	11th to 20th	Day	10% 10% 3 9% 6% 5% 4 4 6% 8% 34%	2005
	21st to end	Day	15% 13% 3 8% 5% 4 4 3 5% 6% 33%	1730
March	1st to 10th	Day	17% 10% 3 9% 5% 4 4 4 4 5% 34%	4576
	11th to 20th	Day	12% 7% 3 9% 6% 5% 5% 4 5% 6% 38%	4902
	21st to end	Day	16% 11% 3 8% 6% 4 5% 3 5% 6% 35%	6043
April	1st to 10th	Day	15% 13% 4 9% 6% 4 5% 4 4 5% 32%	2520
	11th to 20th	Day	14% 9% 3 7% 6% 5% 5% 4 5% 6% 36%	2494
	21st to end	Day	16% 10% 3 8% 5% 4 4 4 4 6% 35%	2567
May	1st to 10th	Day	25% 8% 3 6% 4 4 5% 4 6% 6% 28%	7814
	11th to 20th	Day	18% 7% 2 6% 5% 4 5% 4 6% 6% 35%	8221
	21st to end	Day	20% 7% 2 7% 5% 6% 7% 5% 7% 8% 26%	9060
June	1st to 10th	Day	16% 6% 3 7% 6% 5% 5% 5% 7% 9% 32%	2940
	11th to 20th	Day	16% 6% 2 7% 6% 5% 6% 6% 7% 9% 31%	2940
	21st to end	Day	16% 6% 3 7% 5% 4 6% 5% 7% 9% 32%	2940
July	1st to 10th	Day	13% 6% 2 7% 6% 6% 6% 5% 7% 10% 33%	8280
	11th to 20th	Day	8% 5% 2 6% 5% 5% 6% 6% 8% 12% 37%	8280
	21st to end	Day	14% 6% 2 6% 5% 5% 6% 5% 6% 8% 36%	8993
August	1st to 10th	Day	18% 7% 3 7% 5% 6% 6% 4 6% 8% 30%	4576
	11th to 20th	Day	14% 7% 2 7% 4 5% 7% 5% 8% 10% 32%	3978
	21st to end	Day	12% 6% 2 5% 4 5% 5% 5% 8% 11% 36%	4420
September	1st to 10th	Day	15% 6% 2 7% 4 5% 5% 3 5% 7% 41%	2400
	11th to 20th	Day	13% 5% 2 5% 4 4 4 4 5% 8% 46%	2330
	21st to end	Day	18% 7% 2 6% 4 4 4 4 6% 7% 38%	2200
October	1st to 10th	Day	17% 8% 3 6% 5% 4 5% 3 4 7% 38%	2056
	11th to 20th	Day	15% 8% 2 6% 5% 6% 4 4 6% 7% 38%	2000
	21st to end	Day	20% 7% 3 7% 5% 5% 6% 4 6% 6% 31%	2030
November	1st to 10th	Day	11% 8% 2 7% 5% 4 4 3 5% 6% 43%	1851
	11th to 20th	Day	14% 9% 3 8% 6% 5% 5% 4 5% 6% 35%	1890
	21st to end	Day	15% 10% 4 8% 6% 5% 5% 4 5% 7% 31%	1721
December	1st to 10th	Day	9% 12% 4 10% 7% 5% 6% 5% 7% 8% 25%	2680
	11th to 20th	Day	17% 11% 3 8% 5% 4 5% 4 5% 7% 33%	3066
	21st to end	Day	12% 11% 4 11% 6% 5% 5% 4 7% 8% 28%	4048
January	1st to 10th	Night	10% 9% 3 13% 6% 6% 6% 6% 7% 7% 27%	8234
	11th to 20th	Night	10% 12% 6% 14% 6% 6% 6% 4 7% 9% 22%	8235
	21st to end	Night	11% 8% 3 8% 7% 7% 6% 4 6% 9% 30%	8699
February	1st to 10th	Night	12% 10% 4 8% 6% 5% 5% 4 5% 7% 33%	2730
	11th to 20th	Night	11% 9% 4 10% 7% 5% 4 4 7% 7% 33%	2500
	21st to end	Night	14% 9% 3 10% 5% 5% 5% 4 5% 6% 33%	2076
March	1st to 10th	Night	16% 11% 3 6% 5% 4 4 3 5% 7% 35%	5484
	11th to 20th	Night	12% 9% 4 9% 5% 5% 4 3 5% 7% 37%	5260
	21st to end	Night	14% 12% 3 8% 5% 4 4 3 5% 6% 36%	5130
April	1st to 10th	Night	14% 11% 3 8% 7% 5% 5% 4 7% 6% 28%	2100
	11th to 20th	Night	16% 10% 3 7% 5% 5% 4 4 5% 7% 35%	2075
	21st to end	Night	18% 7% 3 8% 4 4 4 3 6% 6% 37%	2053
May	1st to 10th	Night	25% 8% 2 6% 4 4 5% 3 5% 7% 30%	5140
	11th to 20th	Night	19% 8% 3 6% 4 5% 4 4 5% 7% 35%	4639
	21st to end	Night	20% 8% 3 7% 5% 4 5% 4 6% 8% 30%	5114
June	1st to 10th	Night	16% 6% 2 6% 5% 4 4 3 6% 7% 41%	1680
	11th to 20th	Night	16% 6% 3 6% 4 4 4 4 6% 10% 39%	1680
	21st to end	Night	13% 5% 1 5% 4 5% 4 4 6% 9% 44%	1680
July	1st to 10th	Night	12% 6% 2 6% 5% 5% 5% 4 6% 9% 41%	4680
	11th to 20th	Night	9% 6% 2 7% 5% 5% 5% 4 7% 10% 40%	4680
	21st to end	Night	12% 5% 2 5% 4 5% 5% 4 6% 8% 45%	5084
August	1st to 10th	Night	19% 5% 3 6% 4 5% 5% 4 7% 8% 34%	2789
	11th to 20th	Night	15% 7% 2 6% 4 3 4 3 5% 7% 43%	3255
	21st to end	Night	13% 5% 2 4 3 4 4 3 7% 9% 46%	3677
September	1st to 10th	Night	14% 6% 2 6% 4 5% 4 3 5% 8% 45%	2000
	11th to 20th	Night	14% 5% 1 4 3 3 3 2 4 7% 53%	2070
	21st to end	Night	17% 7% 2 7% 4 3 4 3 4 7% 42%	2200
October	1st to 10th	Night	19% 7% 3 7% 4 3 4 3 5% 6% 39%	2340
	11th to 20th	Night	18% 6% 2 6% 4 4 3 3 5% 7% 41%	2400
	21st to end	Night	20% 8% 3 7% 4 4 5% 4 6% 8% 32%	2810
November	1st to 10th	Night	10% 8% 3 8% 5% 4 5% 3 5% 6% 43%	2667
	11th to 20th	Night	17% 8% 3 7% 4 4 4 4 6% 7% 36%	2730
	21st to end	Night	13% 9% 3 7% 5% 4 5% 4 6% 8% 35%	2897
December	1st to 10th	Night	11% 11% 4 10% 6% 5% 5% 4 7% 9% 28%	4720
	11th to 20th	Night	20% 10% 3 7% 5% 4 4 3 5% 6% 33%	5348
	21st to end	Night	16% 12% 4 10% 5% 5% 4 4 5% 6% 29%	7150

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	46% 9% 13% 19% 11% 2	4662
	11th to 20th	Day	48% 7% 12% 15% 13% 4	4680
	21st to end	Day	46% 7% 10% 22% 14% 1	5479
February	1st to 10th	Day	51% 9% 12% 16% 11% 1	1890
	11th to 20th	Day	46% 9% 11% 20% 12% 2	2014
	21st to end	Day	49% 7% 12% 18% 12% 1	1730
March	1st to 10th	Day	49% 6% 12% 15% 12% 7%	4579
	11th to 20th	Day	40% 11% 17% 21% 7% 4	4902
	21st to end	Day	48% 5% 10% 13% 19% 5%	6043
April	1st to 10th	Day	51% 6% 10% 18% 12% 3	2520
	11th to 20th	Day	45% 8% 13% 19% 14% 2	2494
	21st to end	Day	47% 7% 12% 16% 14% 3	2567
May	1st to 10th	Day	52% 8% 12% 16% 12% 1	7826
	11th to 20th	Day	43% 10% 12% 22% 11% 1	8225
	21st to end	Day	49% 9% 15% 18% 9% 1	9061
June	1st to 10th	Day	44% 11% 14% 18% 13% 1	2940
	11th to 20th	Day	45% 11% 15% 19% 10% 1	2940
	21st to end	Day	44% 10% 15% 20% 10% 1	2940
July	1st to 10th	Day	43% 10% 15% 20% 11% 1	8210
	11th to 20th	Day	35% 9% 16% 29% 11%	8205
	21st to end	Day	41% 8% 12% 25% 14% 1	8795
August	1st to 10th	Day	49% 9% 15% 17% 10% 1	4562
	11th to 20th	Day	41% 10% 17% 26% 6%	4014
	21st to end	Day	36% 9% 15% 29% 10% 1	4420
September	1st to 10th	Day	41% 8% 12% 23% 15% 1	2400
	11th to 20th	Day	35% 7% 13% 23% 21% 1	2330
	21st to end	Day	42% 8% 14% 19% 15% 2	2200
October	1st to 10th	Day	39% 7% 11% 20% 21% 2	3342
	11th to 20th	Day	33% 6% 12% 23% 20% 5%	3240
	21st to end	Day	34% 8% 14% 25% 14% 4	3255
November	1st to 10th	Day	40% 7% 14% 22% 15% 3	1851
	11th to 20th	Day	45% 7% 15% 16% 15% 2	1890
	21st to end	Day	49% 9% 14% 20% 6% 1	1721
December	1st to 10th	Day	50% 9% 11% 21% 7%	2680
	11th to 20th	Day	48% 6% 15% 19% 11% 1	3066
	21st to end	Day	48% 10% 11% 14% 13% 3	4048
January	1st to 10th	Night	48% 9% 13% 17% 12% 1	8234
	11th to 20th	Night	51% 8% 16% 12% 11% 3	8280
	21st to end	Night	45% 7% 15% 16% 15% 3	8699
February	1st to 10th	Night	47% 10% 13% 18% 10% 2	2730
	11th to 20th	Night	47% 8% 15% 16% 13% 2	2502
	21st to end	Night	47% 7% 14% 20% 10% 3	2076
March	1st to 10th	Night	44% 7% 15% 16% 15% 3	5494
	11th to 20th	Night	43% 9% 20% 17% 8% 3	5261
	21st to end	Night	47% 6% 11% 14% 21% 2	5130
April	1st to 10th	Night	51% 8% 12% 16% 11% 2	2100
	11th to 20th	Night	46% 7% 13% 18% 15%	2075
	21st to end	Night	45% 8% 11% 19% 14% 3	2053
May	1st to 10th	Night	52% 6% 14% 15% 12% 1	5146
	11th to 20th	Night	43% 10% 13% 23% 9% 1	4640
	21st to end	Night	48% 9% 13% 20% 9%	5115
June	1st to 10th	Night	40% 8% 13% 24% 14% 1	1680
	11th to 20th	Night	39% 11% 17% 23% 10%	1680
	21st to end	Night	35% 10% 16% 25% 13% 1	1680
July	1st to 10th	Night	38% 7% 18% 21% 15% 1	4640
	11th to 20th	Night	37% 9% 15% 26% 13% 1	4632
	21st to end	Night	34% 7% 14% 29% 15% 1	4967
August	1st to 10th	Night	45% 9% 16% 21% 8% 1	2779
	11th to 20th	Night	39% 7% 17% 28% 9%	3285
	21st to end	Night	32% 7% 13% 35% 13% 1	3677
September	1st to 10th	Night	37% 8% 13% 25% 15% 1	2000
	11th to 20th	Night	31% 7% 13% 25% 24% 1	2070
	21st to end	Night	40% 8% 12% 21% 17% 1	2200
October	1st to 10th	Night	42% 7% 12% 22% 16% 1	3821
	11th to 20th	Night	30% 7% 13% 22% 23% 5%	3899
	21st to end	Night	35% 8% 16% 26% 13% 2	4535
November	1st to 10th	Night	39% 8% 13% 21% 16% 3	2667
	11th to 20th	Night	43% 8% 16% 17% 13% 3	2730
	21st to end	Night	43% 10% 17% 22% 8% 1	2897
December	1st to 10th	Night	46% 9% 14% 25% 6%	4720
	11th to 20th	Night	49% 7% 15% 14% 14% 1	5348
	21st to end	Night	51% 9% 11% 12% 12% 4	7150

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	26% 31% 26% 14% 2	220
	11th to 20th	Day	31% 32% 27% 9% 1	220
	21st to end	Day	24% 33% 31% 9% 4	307
February	1st to 10th	Day	33% 28% 32% 6% 1	330
	11th to 20th	Day	29% 33% 28% 9% 1	493
	21st to end	Day	29% 29% 29% 11% 2	446
March	1st to 10th	Day	26% 27% 32% 13% 2	540
	11th to 20th	Day	27% 30% 29% 12% 2 1	540
	21st to end	Day	33% 28% 23% 10% 4 2	594
April	1st to 10th	Day	34% 25% 23% 12% 5% 1	540
	11th to 20th	Day	27% 30% 27% 10% 5% 2	532
	21st to end	Day	29% 25% 30% 10% 4 2	540
May	1st to 10th	Day	34% 23% 25% 12% 4 1	543
	11th to 20th	Day	20% 20% 35% 17% 6% 2	567
	21st to end	Day	22% 15% 29% 21% 10% 2	617
June	1st to 10th	Day	17% 18% 32% 21% 10% 1	570
	11th to 20th	Day	18% 17% 33% 22% 9% 2	570
	21st to end	Day	18% 18% 31% 21% 10% 1	570
July	1st to 10th	Day	13% 12% 31% 27% 14% 2	565
	11th to 20th	Day	12% 9% 35% 31% 11% 3	564
	21st to end	Day	16% 11% 34% 26% 9% 3	620
August	1st to 10th	Day	11% 12% 28% 30% 14% 5%	566
	11th to 20th	Day	15% 11% 27% 29% 12% 5%	559
	21st to end	Day	13% 14% 31% 25% 12% 6%	619
September	1st to 10th	Day	19% 13% 25% 24% 15% 5%	530
	11th to 20th	Day	13% 10% 30% 23% 15% 9%	530
	21st to end	Day	21% 11% 29% 25% 10% 4	530
October	1st to 10th	Day	26% 14% 23% 21% 12% 3	530
	11th to 20th	Day	19% 22% 27% 23% 7% 1	530
	21st to end	Day	22% 25% 31% 18% 4	489
November	1st to 10th	Day	20% 25% 27% 20% 7% 1	425
	11th to 20th	Day	25% 27% 28% 15% 5% 1	430
	21st to end	Day	27% 26% 31% 15% 1	261
December	1st to 10th	Day	26% 33% 28% 7% 5%	220
	11th to 20th	Day	32% 28% 29% 9% 2	220
	21st to end	Day	24% 27% 37% 9% 2 1	242
January	1st to 10th	Night	20% 26% 39% 14% 2	840
	11th to 20th	Night	23% 23% 36% 16% 3	840
	21st to end	Night	18% 25% 37% 18% 2	924
February	1st to 10th	Night	21% 24% 39% 14% 1	840
	11th to 20th	Night	20% 29% 38% 13%	823
	21st to end	Night	24% 25% 33% 16% 2	692
March	1st to 10th	Night	24% 24% 35% 15% 3	840
	11th to 20th	Night	23% 24% 33% 17% 3 1	840
	21st to end	Night	23% 26% 31% 15% 5%	924
April	1st to 10th	Night	24% 25% 30% 17% 3	840
	11th to 20th	Night	22% 23% 32% 17% 5%	831
	21st to end	Night	24% 21% 28% 22% 6%	793
May	1st to 10th	Night	28% 18% 26% 19% 7% 1	588
	11th to 20th	Night	20% 13% 34% 29% 4	414
	21st to end	Night	19% 9% 27% 31% 13% 1	455
June	1st to 10th	Night	18% 10% 29% 30% 14%	420
	11th to 20th	Night	20% 10% 24% 33% 13%	420
	21st to end	Night	14% 7% 26% 39% 13% 1	420
July	1st to 10th	Night	16% 6% 21% 40% 16% 1	410
	11th to 20th	Night	16% 5% 22% 39% 16% 1	408
	21st to end	Night	13% 6% 22% 42% 16% 1	460
August	1st to 10th	Night	13% 3 24% 38% 21% 2	489
	11th to 20th	Night	14% 7% 21% 35% 20% 3	800
	21st to end	Night	17% 7% 22% 33% 20% 2	917
September	1st to 10th	Night	15% 7% 28% 32% 17% 2	800
	11th to 20th	Night	15% 8% 24% 27% 19% 7%	800
	21st to end	Night	20% 10% 24% 29% 15% 3	800
October	1st to 10th	Night	24% 13% 23% 25% 14% 2	800
	11th to 20th	Night	22% 14% 30% 26% 8% 1	800
	21st to end	Night	27% 15% 33% 21% 4	880
November	1st to 10th	Night	18% 20% 31% 22% 7% 1	820
	11th to 20th	Night	25% 21% 29% 19% 6% 1	840
	21st to end	Night	21% 21% 33% 20% 4 1	840
December	1st to 10th	Night	23% 25% 33% 15% 4	840
	11th to 20th	Night	24% 23% 32% 19% 3	840
	21st to end	Night	23% 23% 37% 15% 2	924

Page generated at 2026-08-27 04:07:12. Version ac07

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