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 2025-04-26.

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% 7% 33%	113541
	Night	15% 9% 3 8% 5% 4 4 4 6% 7% 35%	115065
Transparency	Day	44% 9% 13% 19% 12% 2	117077
	Night	43% 8% 14% 19% 13% 2	119680
Seeing	Day	21% 21% 29% 19% 8% 2	15382
	Night	20% 18% 30% 23% 8% 1	24642

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	9% 9% 4 14% 6% 4 4 3 5% 10% 31%	3597
	11th to 20th	Day	9% 12% 6% 13% 8% 5% 5% 4 6% 7% 26%	3570
	21st to end	Day	12% 11% 6% 11% 5% 4 4 4 4 5% 34%	4233
February	1st to 10th	Day	11% 11% 4 10% 8% 5% 6% 5% 5% 7% 28%	1800
	11th to 20th	Day	10% 9% 3 9% 6% 5% 4 5% 6% 8% 35%	1907
	21st to end	Day	16% 12% 3 8% 5% 5% 4 3 5% 6% 33%	1650
March	1st to 10th	Day	17% 11% 3 9% 5% 4 4 4 4 5% 33%	4476
	11th to 20th	Day	12% 7% 3 9% 6% 5% 5% 4 5% 6% 38%	4796
	21st to end	Day	16% 11% 3 8% 6% 4 5% 3 5% 6% 35%	5913
April	1st to 10th	Day	15% 13% 4 9% 6% 4 4 4 4 5% 32%	2400
	11th to 20th	Day	14% 10% 4 8% 6% 4 5% 3 5% 5% 36%	2374
	21st to end	Day	17% 10% 3 8% 6% 4 4 4 4 6% 35%	2383
May	1st to 10th	Day	25% 9% 3 7% 4 4 4 3 5% 6% 29%	4199
	11th to 20th	Day	22% 8% 2 7% 5% 4 6% 4 6% 6% 29%	4398
	21st to end	Day	13% 5% 2 5% 4 5% 5% 5% 7% 8% 37%	4837
June	1st to 10th	Day	16% 6% 3 7% 6% 5% 6% 5% 7% 9% 30%	2660
	11th to 20th	Day	16% 6% 2 7% 6% 5% 6% 6% 7% 8% 31%	2660
	21st to end	Day	16% 6% 3 8% 5% 5% 6% 5% 7% 9% 31%	2660
July	1st to 10th	Day	10% 6% 2 7% 6% 6% 7% 6% 8% 10% 32%	4440
	11th to 20th	Day	10% 5% 2 7% 5% 5% 7% 5% 8% 11% 34%	4440
	21st to end	Day	14% 7% 3 8% 6% 5% 7% 5% 7% 8% 30%	4814
August	1st to 10th	Day	19% 7% 3 8% 5% 6% 6% 4 6% 8% 30%	4304
	11th to 20th	Day	14% 8% 2 7% 4 5% 7% 5% 8% 10% 31%	3738
	21st to end	Day	13% 6% 2 5% 4 5% 5% 5% 8% 10% 36%	4180
September	1st to 10th	Day	15% 6% 2 7% 4 5% 5% 3 5% 7% 40%	2280
	11th to 20th	Day	14% 5% 2 6% 4 4 4 4 5% 7% 45%	2214
	21st to end	Day	18% 7% 2 6% 4 4 4 4 5% 7% 38%	2090
October	1st to 10th	Day	18% 8% 3 6% 5% 5% 5% 3 4 7% 36%	1953
	11th to 20th	Day	14% 8% 2 5% 5% 5% 4 4 6% 7% 39%	1900
	21st to end	Day	20% 7% 3 7% 5% 5% 6% 4 5% 6% 31%	1929
November	1st to 10th	Day	11% 8% 2 7% 5% 4 4 3 5% 6% 44%	1761
	11th to 20th	Day	15% 9% 3 8% 5% 5% 5% 4 5% 6% 36%	1800
	21st to end	Day	16% 9% 3 7% 6% 5% 4 4 5% 7% 32%	1639
December	1st to 10th	Day	10% 12% 4 10% 7% 6% 6% 5% 8% 8% 25%	2600
	11th to 20th	Day	17% 11% 3 8% 5% 4 5% 4 5% 7% 33%	2986
	21st to end	Day	13% 11% 4 10% 6% 5% 5% 4 7% 8% 28%	3960
January	1st to 10th	Night	12% 8% 3 11% 5% 5% 5% 6% 7% 7% 31%	6349
	11th to 20th	Night	10% 12% 6% 14% 5% 5% 5% 4 7% 9% 24%	6315
	21st to end	Night	12% 10% 4 9% 5% 6% 5% 4 6% 8% 32%	6720
February	1st to 10th	Night	13% 11% 4 8% 6% 5% 5% 4 5% 7% 33%	2600
	11th to 20th	Night	11% 8% 4 10% 7% 5% 4 4 7% 7% 33%	2378
	21st to end	Night	15% 9% 3 10% 5% 5% 5% 4 5% 6% 34%	1980
March	1st to 10th	Night	16% 11% 2 6% 5% 4 4 3 5% 7% 35%	5364
	11th to 20th	Night	12% 9% 4 9% 5% 5% 4 3 5% 7% 37%	5146
	21st to end	Night	14% 12% 3 7% 6% 4 4 3 5% 6% 36%	5018
April	1st to 10th	Night	14% 11% 3 8% 7% 6% 6% 4 7% 6% 28%	2000
	11th to 20th	Night	17% 9% 3 7% 5% 5% 4 3 5% 7% 35%	1975
	21st to end	Night	18% 7% 3 8% 4 4 4 4 6% 6% 37%	1914
May	1st to 10th	Night	25% 9% 3 7% 4 4 4 3 5% 6% 31%	2770
	11th to 20th	Night	22% 11% 3 6% 4 4 4 4 4 5% 33%	2495
	21st to end	Night	14% 6% 2 7% 5% 4 5% 4 7% 9% 38%	2738
June	1st to 10th	Night	15% 6% 2 6% 5% 4 4 3 6% 7% 41%	1520
	11th to 20th	Night	16% 6% 3 6% 4 4 4 4 6% 10% 39%	1520
	21st to end	Night	12% 5% 1 5% 4 5% 4 4 6% 9% 44%	1520
July	1st to 10th	Night	10% 6% 2 5% 5% 5% 5% 5% 7% 7% 42%	2520
	11th to 20th	Night	12% 6% 2 6% 4 4 4 4 7% 10% 41%	2520
	21st to end	Night	15% 7% 2 6% 4 5% 4 4 6% 7% 40%	2739
August	1st to 10th	Night	20% 5% 3 6% 4 5% 5% 4 6% 8% 33%	2622
	11th to 20th	Night	16% 8% 2 6% 4 3 4 3 5% 7% 43%	3058
	21st to end	Night	13% 5% 2 4 3 4 4 3 7% 9% 46%	3476
September	1st to 10th	Night	14% 6% 2 6% 4 5% 4 3 5% 8% 44%	1900
	11th to 20th	Night	14% 5% 1 4 3 3 3 2 4 7% 52%	1966
	21st to end	Night	17% 7% 2 7% 4 3 4 3 4 7% 42%	2090
October	1st to 10th	Night	19% 8% 3 7% 4 3 4 3 5% 6% 37%	2223
	11th to 20th	Night	17% 6% 2 6% 4 4 3 3 5% 8% 41%	2280
	21st to end	Night	21% 8% 3 7% 4 4 5% 4 6% 8% 32%	2669
November	1st to 10th	Night	10% 8% 3 8% 5% 4 5% 3 5% 6% 43%	2537
	11th to 20th	Night	17% 8% 3 6% 4 4 4 4 6% 7% 37%	2600
	21st to end	Night	13% 9% 3 7% 4 4 5% 4 6% 8% 36%	2759
December	1st to 10th	Night	12% 11% 4 10% 5% 5% 5% 4 7% 8% 28%	4580
	11th to 20th	Night	21% 10% 3 7% 5% 4 3 4 5% 6% 33%	5208
	21st to end	Night	16% 12% 4 10% 5% 5% 4 4 5% 6% 29%	6996

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	45% 9% 12% 20% 11% 3	3598
	11th to 20th	Day	51% 8% 12% 15% 11% 3	3600
	21st to end	Day	49% 8% 9% 21% 12% 2	4233
February	1st to 10th	Day	52% 9% 12% 15% 10% 1	1800
	11th to 20th	Day	45% 9% 11% 21% 12% 2	1916
	21st to end	Day	50% 7% 12% 18% 12% 1	1650
March	1st to 10th	Day	49% 6% 12% 15% 12% 7%	4479
	11th to 20th	Day	40% 11% 17% 21% 7% 4	4796
	21st to end	Day	48% 6% 10% 13% 19% 5%	5913
April	1st to 10th	Day	52% 7% 9% 18% 12% 3	2400
	11th to 20th	Day	46% 8% 12% 19% 14% 2	2374
	21st to end	Day	47% 8% 13% 16% 13% 3	2383
May	1st to 10th	Day	54% 8% 11% 16% 10% 1	4213
	11th to 20th	Day	48% 12% 13% 19% 7% 1	4402
	21st to end	Day	36% 12% 15% 24% 13% 1	4837
June	1st to 10th	Day	45% 11% 15% 17% 11% 1	2660
	11th to 20th	Day	44% 11% 15% 19% 9% 1	2660
	21st to end	Day	45% 10% 14% 20% 10% 1	2660
July	1st to 10th	Day	41% 11% 15% 21% 12% 1	4370
	11th to 20th	Day	39% 10% 17% 21% 12% 1	4365
	21st to end	Day	47% 9% 13% 19% 11% 1	4661
August	1st to 10th	Day	50% 9% 15% 17% 9% 1	4290
	11th to 20th	Day	42% 10% 17% 26% 5%	3774
	21st to end	Day	37% 9% 15% 28% 10% 1	4180
September	1st to 10th	Day	41% 8% 13% 22% 14% 1	2280
	11th to 20th	Day	35% 7% 13% 22% 21% 1	2214
	21st to end	Day	42% 8% 13% 19% 15% 2	2090
October	1st to 10th	Day	40% 7% 11% 20% 21% 2	3239
	11th to 20th	Day	33% 6% 11% 24% 21% 5%	3140
	21st to end	Day	34% 8% 14% 26% 13% 5%	3154
November	1st to 10th	Day	39% 7% 15% 22% 15% 3	1761
	11th to 20th	Day	44% 7% 15% 16% 16% 2	1800
	21st to end	Day	48% 9% 15% 20% 6% 1	1639
December	1st to 10th	Day	51% 10% 12% 21% 7%	2600
	11th to 20th	Day	48% 6% 14% 19% 11% 1	2986
	21st to end	Day	47% 11% 11% 14% 14% 3	3960
January	1st to 10th	Night	44% 9% 13% 18% 15% 2	6349
	11th to 20th	Night	48% 9% 17% 12% 10% 3	6360
	21st to end	Night	47% 8% 13% 13% 15% 3	6720
February	1st to 10th	Night	48% 10% 14% 18% 9% 2	2600
	11th to 20th	Night	47% 8% 15% 15% 13% 2	2380
	21st to end	Night	47% 7% 14% 19% 11% 3	1980
March	1st to 10th	Night	44% 7% 15% 16% 15% 3	5374
	11th to 20th	Night	43% 9% 20% 17% 8% 3	5147
	21st to end	Night	47% 6% 11% 14% 21% 2	5018
April	1st to 10th	Night	51% 8% 12% 17% 10% 2	2000
	11th to 20th	Night	46% 7% 13% 18% 15%	1975
	21st to end	Night	45% 9% 11% 20% 13% 3	1914
May	1st to 10th	Night	52% 8% 10% 17% 10% 2	2776
	11th to 20th	Night	50% 9% 12% 19% 8% 1	2496
	21st to end	Night	38% 13% 16% 19% 13% 1	2739
June	1st to 10th	Night	41% 8% 14% 24% 12% 1	1520
	11th to 20th	Night	38% 11% 18% 22% 10%	1520
	21st to end	Night	35% 11% 15% 25% 13% 1	1520
July	1st to 10th	Night	37% 9% 18% 20% 15% 1	2480
	11th to 20th	Night	37% 9% 16% 25% 12% 1	2472
	21st to end	Night	41% 8% 14% 22% 13% 2	2651
August	1st to 10th	Night	46% 9% 17% 20% 8% 1	2612
	11th to 20th	Night	40% 7% 17% 27% 9%	3088
	21st to end	Night	32% 7% 13% 35% 13% 1	3476
September	1st to 10th	Night	38% 9% 13% 25% 15% 1	1900
	11th to 20th	Night	32% 7% 13% 24% 24% 1	1966
	21st to end	Night	40% 8% 12% 21% 18% 1	2090
October	1st to 10th	Night	43% 7% 12% 22% 16% 1	3704
	11th to 20th	Night	30% 7% 13% 22% 24% 5%	3779
	21st to end	Night	35% 8% 16% 25% 12% 2	4394
November	1st to 10th	Night	39% 8% 13% 20% 17% 3	2537
	11th to 20th	Night	43% 8% 16% 17% 14% 3	2600
	21st to end	Night	42% 10% 17% 22% 8% 1	2759
December	1st to 10th	Night	46% 9% 14% 25% 6%	4580
	11th to 20th	Night	49% 7% 15% 14% 14% 1	5208
	21st to end	Night	51% 10% 12% 12% 13% 4	6996

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	27% 30% 27% 14% 3 1	200
	11th to 20th	Day	27% 34% 29% 9% 1 1	200
	21st to end	Day	19% 34% 33% 10% 4	279
February	1st to 10th	Day	34% 30% 30% 6% 1	300
	11th to 20th	Day	29% 35% 27% 9% 1	455
	21st to end	Day	29% 29% 29% 11% 2	414
March	1st to 10th	Day	26% 27% 32% 13% 2	500
	11th to 20th	Day	25% 31% 29% 12% 2 1	500
	21st to end	Day	31% 28% 24% 11% 4 2	550
April	1st to 10th	Day	33% 26% 24% 12% 5% 1	500
	11th to 20th	Day	27% 29% 26% 11% 5% 2	492
	21st to end	Day	27% 24% 31% 10% 5% 2	480
May	1st to 10th	Day	31% 23% 26% 13% 5% 2	463
	11th to 20th	Day	20% 18% 36% 20% 6% 2	487
	21st to end	Day	18% 14% 29% 24% 12% 3	529
June	1st to 10th	Day	17% 18% 33% 21% 10% 1	490
	11th to 20th	Day	15% 15% 34% 24% 10% 2	490
	21st to end	Day	18% 17% 31% 22% 11% 1	490
July	1st to 10th	Day	13% 12% 29% 28% 16% 2	485
	11th to 20th	Day	11% 7% 35% 32% 12% 3	484
	21st to end	Day	16% 11% 33% 28% 10% 2	532
August	1st to 10th	Day	12% 11% 28% 30% 14% 5%	486
	11th to 20th	Day	15% 10% 27% 28% 14% 6%	479
	21st to end	Day	13% 13% 29% 25% 13% 7%	539
September	1st to 10th	Day	19% 13% 23% 24% 15% 6%	490
	11th to 20th	Day	13% 11% 29% 22% 14% 10%	490
	21st to end	Day	21% 12% 28% 25% 10% 4	490
October	1st to 10th	Day	27% 15% 22% 21% 11% 3	490
	11th to 20th	Day	18% 22% 27% 24% 8% 1	490
	21st to end	Day	22% 24% 31% 18% 4	454
November	1st to 10th	Day	18% 24% 28% 21% 7% 1	395
	11th to 20th	Day	25% 26% 29% 15% 5% 1	400
	21st to end	Day	24% 27% 32% 15% 1	239
December	1st to 10th	Day	25% 34% 28% 8% 6%	200
	11th to 20th	Day	30% 31% 30% 9% 2	200
	21st to end	Day	21% 28% 39% 9% 2 1	220
January	1st to 10th	Night	19% 25% 39% 15% 2	800
	11th to 20th	Night	22% 23% 36% 17% 3	800
	21st to end	Night	16% 25% 38% 19% 2	880
February	1st to 10th	Night	20% 24% 40% 14% 1	800
	11th to 20th	Night	20% 30% 37% 13% 1	783
	21st to end	Night	24% 25% 32% 16% 3	660
March	1st to 10th	Night	24% 24% 34% 15% 3	800
	11th to 20th	Night	22% 25% 33% 17% 3 1	800
	21st to end	Night	22% 26% 31% 16% 5%	880
April	1st to 10th	Night	23% 25% 31% 18% 4	800
	11th to 20th	Night	22% 22% 32% 18% 6%	791
	21st to end	Night	23% 21% 27% 22% 7%	740
May	1st to 10th	Night	27% 18% 25% 21% 8% 1	532
	11th to 20th	Night	18% 12% 34% 30% 5% 1	374
	21st to end	Night	16% 9% 26% 33% 14% 1	411
June	1st to 10th	Night	17% 10% 29% 29% 15%	380
	11th to 20th	Night	18% 8% 24% 35% 14% 1	380
	21st to end	Night	13% 7% 26% 40% 14% 1	380
July	1st to 10th	Night	16% 5% 20% 41% 17% 1	370
	11th to 20th	Night	16% 4 23% 39% 17% 1	368
	21st to end	Night	14% 6% 21% 43% 16% 1	416
August	1st to 10th	Night	13% 3 24% 38% 21% 2	442
	11th to 20th	Night	15% 6% 20% 36% 20% 3	723
	21st to end	Night	17% 6% 20% 34% 21% 2	836
September	1st to 10th	Night	15% 7% 29% 30% 17% 2	760
	11th to 20th	Night	16% 9% 25% 25% 19% 7%	760
	21st to end	Night	20% 10% 23% 29% 15% 3	760
October	1st to 10th	Night	24% 13% 24% 24% 13% 2	760
	11th to 20th	Night	21% 14% 30% 26% 9% 1	760
	21st to end	Night	27% 14% 33% 21% 4	836
November	1st to 10th	Night	16% 21% 31% 23% 8% 1	780
	11th to 20th	Night	23% 21% 29% 19% 6% 1	800
	21st to end	Night	20% 21% 33% 21% 4 1	800
December	1st to 10th	Night	23% 25% 33% 15% 4	800
	11th to 20th	Night	23% 23% 33% 19% 3	800
	21st to end	Night	22% 23% 38% 16% 2	880

Page generated at 2025-04-23 09:25:03. Version ac07

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