Chateau De Testa Stars
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Chateau De Testa Stars 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	16% 10% 4 8% 5% 5% 4 4 5% 7% 31%	101154
	Night	17% 11% 4 8% 5% 4 4 3 5% 6% 32%	97761
Transparency	Day	52% 5% 11% 20% 10% 1	100961
	Night	53% 4 11% 20% 10% 1	97624
Seeing	Day	24% 13% 27% 21% 11% 4	14689
	Night	23% 11% 26% 27% 12% 1	24303

By Month

Percentage Cloud Cover SE (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	18% 21% 11% 12% 5% 3 3 2 3 4 18%	2749
	11th to 20th	Day	13% 22% 9% 18% 8% 3 3 2 3 4 16%	2840
	21st to end	Day	25% 21% 7% 14% 6% 4 3 2 3 4 11%	3124
February	1st to 10th	Day	19% 18% 5% 12% 7% 5% 3 3 4 4 21%	1710
	11th to 20th	Day	16% 15% 6% 14% 6% 5% 4 4 5% 5% 21%	1663
	21st to end	Day	20% 14% 5% 11% 6% 4 3 3 4 5% 24%	1560
March	1st to 10th	Day	20% 11% 4 9% 5% 4 4 3 5% 6% 29%	3435
	11th to 20th	Day	13% 11% 5% 10% 5% 5% 5% 3 4 5% 32%	3480
	21st to end	Day	19% 10% 3 8% 5% 5% 4 4 5% 6% 31%	3815
April	1st to 10th	Day	16% 12% 4 8% 4 5% 4 4 6% 6% 30%	2209
	11th to 20th	Day	18% 11% 3 7% 5% 4 5% 4 4 6% 32%	2269
	21st to end	Day	22% 9% 3 7% 5% 4 4 3 4 6% 33%	2470
May	1st to 10th	Day	24% 9% 3 8% 4 4 4 3 6% 6% 28%	4082
	11th to 20th	Day	19% 9% 3 8% 5% 5% 5% 5% 6% 7% 29%	4081
	21st to end	Day	13% 6% 2 6% 5% 5% 5% 4 6% 10% 38%	4819
June	1st to 10th	Day	15% 7% 3 7% 6% 5% 6% 4 6% 9% 33%	2660
	11th to 20th	Day	14% 6% 2 7% 6% 5% 5% 5% 7% 9% 34%	2660
	21st to end	Day	14% 8% 2 6% 5% 5% 4 4 7% 8% 37%	2660
July	1st to 10th	Day	10% 6% 2 7% 5% 6% 5% 4 6% 9% 40%	4410
	11th to 20th	Day	10% 6% 2 7% 5% 4 5% 4 7% 9% 40%	4120
	21st to end	Day	11% 7% 3 8% 6% 4 6% 4 6% 8% 37%	4466
August	1st to 10th	Day	15% 8% 3 9% 6% 5% 5% 5% 6% 8% 30%	4104
	11th to 20th	Day	11% 7% 3 8% 5% 6% 6% 4 7% 8% 35%	4044
	21st to end	Day	9% 5% 3 6% 5% 5% 6% 5% 8% 9% 39%	4290
September	1st to 10th	Day	15% 7% 2 6% 4 4 5% 3 4 6% 43%	2280
	11th to 20th	Day	12% 6% 2 6% 4 4 4 4 6% 8% 44%	2123
	21st to end	Day	20% 8% 4 6% 4 4 4 3 5% 7% 35%	2071
October	1st to 10th	Day	17% 7% 2 6% 4 4 4 4 6% 7% 39%	1900
	11th to 20th	Day	20% 7% 3 7% 4 5% 4 3 6% 6% 34%	1900
	21st to end	Day	22% 10% 3 8% 4 4 4 3 5% 7% 31%	2090
November	1st to 10th	Day	12% 8% 3 7% 6% 4 5% 4 5% 7% 41%	1804
	11th to 20th	Day	19% 14% 3 7% 4 5% 4 3 4 5% 32%	1544
	21st to end	Day	19% 15% 4 9% 6% 4 4 4 4 6% 24%	1520
December	1st to 10th	Day	20% 20% 7% 10% 6% 4 5% 3 3 5% 17%	1520
	11th to 20th	Day	20% 18% 8% 11% 4 3 4 3 4 6% 20%	1910
	21st to end	Day	24% 23% 7% 11% 5% 3 3 2 3 4 14%	2772
January	1st to 10th	Night	16% 21% 9% 12% 5% 4 4 3 3 4 18%	4193
	11th to 20th	Night	16% 18% 7% 15% 6% 6% 4 3 4 4 15%	4120
	21st to end	Night	28% 17% 7% 11% 5% 4 3 2 3 3 16%	4532
February	1st to 10th	Night	19% 14% 5% 11% 7% 5% 4 3 4 5% 24%	2470
	11th to 20th	Night	19% 13% 5% 12% 5% 5% 4 3 5% 5% 24%	2403
	21st to end	Night	20% 13% 4 11% 5% 5% 4 3 5% 5% 25%	1890
March	1st to 10th	Night	22% 12% 3 7% 4 4 3 3 4 6% 33%	3418
	11th to 20th	Night	17% 13% 6% 8% 4 4 3 3 4 6% 34%	3480
	21st to end	Night	16% 10% 3 8% 4 4 3 3 4 6% 39%	3817
April	1st to 10th	Night	18% 13% 3 6% 4 5% 4 3 3 6% 34%	1971
	11th to 20th	Night	16% 9% 3 7% 4 4 5% 4 5% 7% 37%	1875
	21st to end	Night	15% 9% 4 8% 4 5% 4 3 6% 7% 36%	1710
May	1st to 10th	Night	27% 9% 3 6% 4 4 4 3 4 6% 29%	2813
	11th to 20th	Night	18% 9% 3 7% 5% 4 4 4 5% 6% 35%	2812
	21st to end	Night	12% 6% 2 6% 4 4 4 4 7% 10% 40%	2736
June	1st to 10th	Night	11% 5% 2 7% 5% 4 4 4 7% 8% 44%	1520
	11th to 20th	Night	12% 5% 3 7% 4 4 5% 4 6% 9% 41%	1520
	21st to end	Night	10% 6% 2 6% 5% 4 5% 5% 7% 10% 41%	1520
July	1st to 10th	Night	11% 8% 3 8% 5% 4 4 3 6% 8% 40%	2545
	11th to 20th	Night	10% 5% 2 6% 5% 4 5% 4 6% 9% 42%	2840
	21st to end	Night	9% 8% 3 9% 5% 5% 4 4 6% 7% 40%	3087
August	1st to 10th	Night	14% 8% 4 7% 5% 4 4 4 6% 7% 35%	2825
	11th to 20th	Night	12% 7% 3 6% 5% 4 4 4 5% 7% 41%	2785
	21st to end	Night	8% 5% 2 6% 4 4 6% 5% 7% 9% 44%	3334
September	1st to 10th	Night	12% 6% 2 5% 3 4 4 4 6% 6% 49%	1900
	11th to 20th	Night	9% 5% 2 5% 3 3 4 2 6% 8% 52%	2052
	21st to end	Night	17% 8% 3 6% 5% 4 4 4 5% 6% 40%	2107
October	1st to 10th	Night	14% 6% 2 7% 4 4 5% 3 5% 6% 44%	2280
	11th to 20th	Night	17% 7% 3 6% 4 5% 4 3 5% 7% 39%	2280
	21st to end	Night	21% 9% 2 6% 3 5% 3 3 4 7% 36%	2508
November	1st to 10th	Night	13% 9% 3 5% 4 3 4 4 5% 7% 42%	2295
	11th to 20th	Night	19% 11% 3 7% 5% 5% 5% 4 5% 6% 31%	2634
	21st to end	Night	19% 15% 3 8% 5% 5% 4 3 4 6% 29%	2660
December	1st to 10th	Night	22% 16% 8% 10% 5% 4 4 3 5% 5% 19%	2660
	11th to 20th	Night	19% 17% 6% 11% 6% 4 4 3 4 5% 22%	3285
	21st to end	Night	24% 17% 7% 11% 6% 5% 4 3 5% 5% 14%	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	72% 3 8% 12% 5%	2750
	11th to 20th	Day	75% 2 7% 12% 3 1	2840
	21st to end	Day	79% 3 8% 8% 2	3124
February	1st to 10th	Day	68% 3 9% 13% 6%	1710
	11th to 20th	Day	65% 4 10% 14% 6%	1672
	21st to end	Day	63% 3 10% 16% 7% 1	1560
March	1st to 10th	Day	55% 5% 10% 23% 6%	3435
	11th to 20th	Day	54% 4 13% 20% 7% 1	3480
	21st to end	Day	53% 4 10% 21% 11% 1	3815
April	1st to 10th	Day	54% 4 10% 18% 12% 2	2209
	11th to 20th	Day	52% 5% 10% 17% 14% 2	2269
	21st to end	Day	52% 4 10% 21% 11% 2	2470
May	1st to 10th	Day	56% 5% 11% 20% 8% 1	4120
	11th to 20th	Day	53% 6% 12% 19% 8% 1	4085
	21st to end	Day	40% 7% 16% 23% 12% 3	4833
June	1st to 10th	Day	46% 6% 14% 22% 11% 1	2660
	11th to 20th	Day	45% 6% 15% 21% 12% 1	2660
	21st to end	Day	43% 6% 12% 27% 11% 1	2660
July	1st to 10th	Day	42% 5% 12% 24% 15% 3	4340
	11th to 20th	Day	39% 4 12% 30% 15%	4051
	21st to end	Day	45% 4 12% 20% 18% 1	4324
August	1st to 10th	Day	52% 5% 13% 22% 8%	4091
	11th to 20th	Day	44% 5% 12% 28% 11% 1	4083
	21st to end	Day	38% 5% 12% 29% 14% 2	4290
September	1st to 10th	Day	41% 6% 9% 22% 19% 3	2280
	11th to 20th	Day	38% 4 15% 26% 16% 1	2123
	21st to end	Day	49% 5% 10% 21% 14% 1	2071
October	1st to 10th	Day	43% 5% 12% 24% 15% 1	1900
	11th to 20th	Day	49% 4 11% 25% 9% 1	1900
	21st to end	Day	54% 4 12% 20% 10% 1	2090
November	1st to 10th	Day	44% 5% 12% 20% 17% 2	1804
	11th to 20th	Day	54% 4 11% 19% 9% 2	1544
	21st to end	Day	61% 4 13% 17% 5% 1	1520
December	1st to 10th	Day	71% 4 10% 12% 3	1520
	11th to 20th	Day	68% 3 11% 15% 3	1906
	21st to end	Day	76% 3 9% 10% 2	2772
January	1st to 10th	Night	70% 4 9% 14% 3	4193
	11th to 20th	Night	73% 4 10% 11% 2	4120
	21st to end	Night	75% 3 6% 12% 3	4532
February	1st to 10th	Night	64% 3 10% 17% 7%	2470
	11th to 20th	Night	62% 4 10% 17% 7%	2405
	21st to end	Night	61% 5% 9% 15% 10% 1	1890
March	1st to 10th	Night	55% 3 10% 24% 7%	3418
	11th to 20th	Night	53% 4 12% 24% 7% 1	3480
	21st to end	Night	47% 4 10% 23% 15% 2	3817
April	1st to 10th	Night	52% 5% 9% 19% 14% 2	1971
	11th to 20th	Night	46% 6% 11% 19% 16% 3	1875
	21st to end	Night	48% 5% 9% 24% 12% 3	1710
May	1st to 10th	Night	56% 4 9% 18% 10% 2	2840
	11th to 20th	Night	49% 6% 12% 23% 9% 1	2813
	21st to end	Night	37% 7% 16% 23% 13% 4	2743
June	1st to 10th	Night	37% 7% 15% 25% 15% 2	1520
	11th to 20th	Night	39% 6% 15% 25% 14% 2	1520
	21st to end	Night	38% 7% 14% 23% 16% 1	1520
July	1st to 10th	Night	44% 5% 9% 22% 17% 3	2505
	11th to 20th	Night	38% 5% 14% 26% 16% 1	2786
	21st to end	Night	43% 5% 10% 18% 22% 2	2988
August	1st to 10th	Night	48% 6% 13% 22% 11%	2814
	11th to 20th	Night	42% 4 10% 31% 12% 1	2812
	21st to end	Night	35% 5% 14% 31% 13% 2	3334
September	1st to 10th	Night	35% 6% 11% 24% 20% 4	1900
	11th to 20th	Night	30% 4 14% 28% 23% 1	2052
	21st to end	Night	46% 4 11% 22% 16% 1	2107
October	1st to 10th	Night	41% 6% 13% 24% 15% 2	2280
	11th to 20th	Night	46% 3 11% 25% 13% 2	2280
	21st to end	Night	49% 4 11% 22% 13% 1	2508
November	1st to 10th	Night	41% 4 12% 22% 16% 4	2295
	11th to 20th	Night	53% 4 9% 21% 10% 2	2634
	21st to end	Night	57% 4 11% 22% 6% 1	2660
December	1st to 10th	Night	68% 4 12% 12% 4	2660
	11th to 20th	Night	65% 4 11% 17% 3	3288
	21st to end	Night	73% 4 10% 10% 2	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	30% 27% 26% 12% 4 1	247
	11th to 20th	Day	37% 28% 25% 7% 3 1	270
	21st to end	Day	34% 21% 33% 8% 3	297
February	1st to 10th	Day	36% 21% 34% 7% 1	270
	11th to 20th	Day	41% 25% 26% 8% 1	270
	21st to end	Day	40% 25% 26% 8% 1	268
March	1st to 10th	Day	32% 20% 29% 16% 3	460
	11th to 20th	Day	35% 19% 29% 13% 4 1	460
	21st to end	Day	33% 17% 29% 17% 4 1	506
April	1st to 10th	Day	32% 17% 27% 17% 6% 1	460
	11th to 20th	Day	28% 17% 28% 15% 9% 3	452
	21st to end	Day	31% 17% 30% 16% 4 2	460
May	1st to 10th	Day	30% 14% 26% 19% 7% 3	463
	11th to 20th	Day	23% 10% 33% 20% 10% 4	487
	21st to end	Day	16% 9% 27% 27% 16% 5%	529
June	1st to 10th	Day	16% 12% 28% 26% 15% 3	490
	11th to 20th	Day	18% 12% 24% 27% 14% 5%	490
	21st to end	Day	16% 10% 30% 26% 14% 3	490
July	1st to 10th	Day	15% 6% 18% 29% 22% 9%	485
	11th to 20th	Day	13% 6% 26% 30% 17% 8%	484
	21st to end	Day	14% 4 26% 31% 18% 7%	532
August	1st to 10th	Day	13% 7% 22% 27% 21% 10%	486
	11th to 20th	Day	15% 6% 23% 29% 16% 11%	479
	21st to end	Day	13% 4 22% 27% 23% 10%	539
September	1st to 10th	Day	19% 6% 21% 26% 20% 8%	490
	11th to 20th	Day	13% 4 20% 30% 23% 10%	490
	21st to end	Day	27% 11% 22% 22% 14% 5%	490
October	1st to 10th	Day	18% 10% 27% 22% 18% 5%	490
	11th to 20th	Day	24% 14% 28% 23% 9% 2	490
	21st to end	Day	32% 13% 29% 18% 8% 1	539
November	1st to 10th	Day	21% 15% 31% 19% 11% 3	396
	11th to 20th	Day	32% 18% 29% 14% 5% 2	192
	21st to end	Day	23% 19% 44% 12% 2 1	180
December	1st to 10th	Day	36% 23% 24% 13% 3 1	180
	11th to 20th	Day	35% 21% 28% 13% 3	180
	21st to end	Day	37% 17% 31% 11% 4	198
January	1st to 10th	Night	29% 19% 33% 14% 3	760
	11th to 20th	Night	33% 18% 29% 18% 3	760
	21st to end	Night	31% 17% 30% 19% 3	836
February	1st to 10th	Night	31% 17% 26% 24% 2	760
	11th to 20th	Night	32% 18% 34% 15% 1	743
	21st to end	Night	31% 15% 32% 20% 2	628
March	1st to 10th	Night	26% 18% 30% 22% 3	760
	11th to 20th	Night	30% 17% 26% 19% 7% 1	760
	21st to end	Night	23% 17% 33% 21% 5% 1	836
April	1st to 10th	Night	28% 14% 30% 22% 6% 1	760
	11th to 20th	Night	24% 13% 32% 22% 9% 1	751
	21st to end	Night	21% 9% 34% 31% 6%	570
May	1st to 10th	Night	23% 9% 24% 34% 9% 1	570
	11th to 20th	Night	21% 8% 26% 33% 12% 1	561
	21st to end	Night	11% 4 23% 35% 24% 2	416
June	1st to 10th	Night	12% 3 26% 41% 16% 1	380
	11th to 20th	Night	11% 7% 21% 41% 19% 1	380
	21st to end	Night	12% 3 28% 36% 20% 1	380
July	1st to 10th	Night	12% 3 20% 38% 24% 4	382
	11th to 20th	Night	11% 3 17% 35% 29% 5%	552
	21st to end	Night	12% 3 13% 45% 26% 2	624
August	1st to 10th	Night	12% 1 14% 43% 27% 3	567
	11th to 20th	Night	13% 5% 12% 37% 29% 4	564
	21st to end	Night	11% 4 18% 34% 29% 5%	746
September	1st to 10th	Night	15% 3 20% 32% 26% 4	760
	11th to 20th	Night	11% 4 16% 37% 29% 4	760
	21st to end	Night	20% 7% 23% 27% 19% 4	760
October	1st to 10th	Night	18% 8% 22% 29% 22% 2	760
	11th to 20th	Night	22% 9% 30% 28% 10% 1	760
	21st to end	Night	27% 12% 26% 28% 8%	836
November	1st to 10th	Night	19% 12% 26% 31% 12%	745
	11th to 20th	Night	28% 13% 27% 23% 8% 1	760
	21st to end	Night	29% 14% 29% 21% 7%	760
December	1st to 10th	Night	33% 18% 26% 18% 5%	760
	11th to 20th	Night	29% 18% 29% 21% 3	760
	21st to end	Night	30% 17% 28% 22% 3	836

Page generated at 2024-10-30 01:22:54. Version ac07

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