Stargate 4173 at Grimaldi Tower
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Stargate 4173 at Grimaldi Tower clear sky chart from 2005-11-06 to 2024-11-05.

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% 8% 3 7% 5% 4 4 4 5% 7% 37%	101305
	Night	17% 8% 3 7% 4 4 4 3 5% 6% 38%	97721
Transparency	Day	44% 5% 12% 23% 14% 2	104837
	Night	44% 4 12% 23% 14% 2	102278
Seeing	Day	23% 16% 29% 20% 9% 3	14947
	Night	21% 15% 28% 26% 8% 1	24021

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	15% 9% 3 5% 4 4 4 3 4 5% 44%	2517
	11th to 20th	Day	15% 11% 4 8% 7% 4 4 3 5% 6% 33%	2520
	21st to end	Day	21% 13% 5% 8% 4 3 3 2 5% 4 30%	2914
February	1st to 10th	Day	18% 9% 2 7% 5% 4 4 5% 5% 7% 34%	1720
	11th to 20th	Day	14% 8% 3 7% 5% 5% 4 4 5% 7% 38%	1848
	21st to end	Day	19% 9% 3 8% 4 4 4 3 4 6% 36%	1570
March	1st to 10th	Day	26% 10% 3 8% 4 3 3 2 4 4 33%	3116
	11th to 20th	Day	11% 7% 3 7% 5% 4 5% 4 6% 7% 41%	3283
	21st to end	Day	21% 8% 3 7% 4 4 4 3 4 6% 37%	4164
April	1st to 10th	Day	19% 10% 3 6% 5% 4 4 4 5% 6% 35%	2280
	11th to 20th	Day	17% 7% 2 7% 5% 4 4 4 5% 7% 38%	2254
	21st to end	Day	20% 6% 2 5% 5% 4 4 4 4 6% 39%	2345
May	1st to 10th	Day	25% 9% 2 5% 4 3 4 3 5% 7% 31%	4106
	11th to 20th	Day	22% 8% 3 7% 5% 5% 5% 3 5% 7% 32%	4384
	21st to end	Day	13% 5% 2 5% 4 4 4 4 7% 9% 43%	4837
June	1st to 10th	Day	17% 5% 2 6% 5% 5% 5% 4 7% 9% 35%	2660
	11th to 20th	Day	14% 7% 3 6% 5% 5% 5% 4 7% 9% 35%	2660
	21st to end	Day	12% 7% 2 7% 6% 5% 5% 4 6% 9% 37%	2660
July	1st to 10th	Day	10% 7% 3 8% 6% 6% 5% 5% 7% 8% 36%	4440
	11th to 20th	Day	11% 6% 2 7% 5% 5% 6% 4 7% 10% 38%	4440
	21st to end	Day	14% 8% 3 8% 5% 5% 6% 4 6% 7% 34%	4814
August	1st to 10th	Day	19% 7% 3 7% 5% 5% 4 5% 6% 8% 31%	4265
	11th to 20th	Day	11% 7% 3 6% 4 4 5% 4 7% 9% 40%	3730
	21st to end	Day	10% 5% 2 6% 4 4 4 4 5% 10% 45%	4180
September	1st to 10th	Day	13% 6% 2 5% 5% 5% 4 4 5% 7% 43%	2280
	11th to 20th	Day	12% 4 2 6% 4 4 4 3 5% 7% 49%	2183
	21st to end	Day	18% 6% 2 6% 3 4 4 4 5% 7% 40%	2090
October	1st to 10th	Day	21% 7% 2 5% 4 3 4 3 5% 5% 41%	2005
	11th to 20th	Day	13% 7% 2 5% 4 4 4 4 5% 7% 45%	1900
	21st to end	Day	21% 7% 2 5% 5% 4 4 3 5% 7% 37%	1904
November	1st to 10th	Day	13% 7% 2 4 4 3 4 3 5% 6% 49%	1708
	11th to 20th	Day	18% 7% 2 5% 4 3 3 3 6% 6% 43%	1710
	21st to end	Day	17% 7% 2 6% 4 3 4 3 5% 7% 42%	1620
December	1st to 10th	Day	18% 9% 3 9% 5% 4 4 3 4 6% 34%	1520
	11th to 20th	Day	20% 8% 2 5% 4 3 4 3 4 6% 40%	1906
	21st to end	Day	20% 11% 4 9% 5% 4 3 3 5% 6% 29%	2772
January	1st to 10th	Night	16% 7% 2 6% 4 4 4 3 5% 7% 42%	4429
	11th to 20th	Night	15% 8% 4 9% 5% 4 4 4 5% 6% 36%	4440
	21st to end	Night	23% 11% 4 8% 5% 3 3 2 5% 5% 31%	4725
February	1st to 10th	Night	15% 10% 3 6% 4 5% 4 3 5% 6% 38%	2458
	11th to 20th	Night	15% 8% 3 7% 6% 4 5% 5% 5% 6% 36%	2218
	21st to end	Night	18% 8% 3 8% 4 3 3 4 5% 6% 38%	1884
March	1st to 10th	Night	24% 11% 3 6% 4 4 3 3 5% 6% 32%	3724
	11th to 20th	Night	12% 7% 2 8% 6% 5% 5% 4 6% 6% 41%	3671
	21st to end	Night	18% 10% 3 6% 4 3 4 3 5% 5% 39%	3467
April	1st to 10th	Night	17% 9% 3 7% 6% 5% 5% 3 6% 7% 33%	1900
	11th to 20th	Night	19% 8% 2 6% 6% 5% 3 3 4 6% 37%	1875
	21st to end	Night	20% 8% 3 6% 4 3 4 3 5% 5% 40%	1834
May	1st to 10th	Night	26% 7% 3 8% 5% 3 4 3 4 7% 29%	2834
	11th to 20th	Night	21% 9% 3 9% 4 4 3 3 5% 5% 33%	2537
	21st to end	Night	15% 7% 2 5% 4 4 4 3 6% 8% 41%	2738
June	1st to 10th	Night	16% 6% 2 6% 4 4 5% 3 5% 8% 40%	1520
	11th to 20th	Night	14% 7% 2 6% 4 4 3 4 7% 8% 40%	1520
	21st to end	Night	13% 6% 2 5% 4 4 4 4 7% 10% 41%	1520
July	1st to 10th	Night	10% 7% 2 7% 5% 5% 6% 5% 7% 8% 38%	2520
	11th to 20th	Night	13% 7% 3 7% 5% 5% 5% 4 7% 9% 36%	2520
	21st to end	Night	15% 9% 3 7% 4 4 5% 4 6% 6% 38%	2739
August	1st to 10th	Night	20% 8% 3 8% 5% 5% 5% 4 5% 7% 30%	2617
	11th to 20th	Night	14% 7% 2 7% 4 4 5% 3 6% 7% 39%	3097
	21st to end	Night	11% 5% 2 5% 3 3 3 3 5% 6% 53%	3476
September	1st to 10th	Night	15% 7% 2 6% 4 4 4 3 4 6% 47%	1900
	11th to 20th	Night	12% 6% 2 4 2 3 3 3 5% 6% 54%	1995
	21st to end	Night	17% 6% 2 6% 3 3 4 3 6% 7% 43%	2090
October	1st to 10th	Night	19% 7% 2 6% 4 3 4 2 4 6% 41%	2173
	11th to 20th	Night	14% 6% 2 6% 4 3 4 3 5% 6% 46%	2280
	21st to end	Night	20% 8% 2 6% 5% 4 4 3 5% 6% 38%	2693
November	1st to 10th	Night	14% 8% 2 5% 3 4 3 4 5% 6% 46%	2470
	11th to 20th	Night	18% 8% 2 5% 4 4 3 3 5% 6% 42%	2470
	21st to end	Night	14% 7% 3 6% 5% 4 4 4 5% 7% 42%	2555
December	1st to 10th	Night	19% 9% 3 6% 4 3 4 3 5% 6% 36%	2660
	11th to 20th	Night	19% 8% 3 7% 5% 4 5% 5% 5% 5% 35%	3288
	21st to end	Night	22% 11% 4 8% 4 4 4 3 5% 5% 31%	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	41% 4 10% 34% 9% 2	2518
	11th to 20th	Day	52% 3 10% 24% 9% 1	2520
	21st to end	Day	57% 3 9% 20% 9% 1	2914
February	1st to 10th	Day	49% 5% 12% 21% 12% 1	1720
	11th to 20th	Day	45% 4 9% 24% 16% 2	1857
	21st to end	Day	51% 2 10% 22% 12% 3	1570
March	1st to 10th	Day	56% 3 11% 18% 11% 2	3119
	11th to 20th	Day	38% 6% 13% 30% 11% 1	3283
	21st to end	Day	49% 3 6% 15% 22% 5%	4164
April	1st to 10th	Day	50% 4 8% 21% 14% 3	2280
	11th to 20th	Day	45% 4 10% 23% 16% 2	2254
	21st to end	Day	46% 4 10% 21% 16% 3	2345
May	1st to 10th	Day	53% 4 14% 16% 12% 1	4120
	11th to 20th	Day	52% 5% 13% 20% 9% 1	4388
	21st to end	Day	36% 6% 13% 27% 17% 2	4837
June	1st to 10th	Day	43% 7% 13% 23% 12% 1	2660
	11th to 20th	Day	44% 6% 13% 25% 10% 2	2660
	21st to end	Day	42% 7% 13% 25% 12% 1	2660
July	1st to 10th	Day	44% 7% 12% 21% 15% 1	4370
	11th to 20th	Day	40% 5% 17% 24% 13% 1	4365
	21st to end	Day	48% 6% 12% 18% 15% 1	4661
August	1st to 10th	Day	51% 6% 13% 22% 8%	4251
	11th to 20th	Day	38% 5% 17% 30% 10%	3766
	21st to end	Day	35% 5% 12% 33% 14% 1	4180
September	1st to 10th	Day	40% 6% 10% 24% 18% 1	2280
	11th to 20th	Day	35% 4 9% 26% 24% 2	2183
	21st to end	Day	43% 5% 10% 22% 17% 3	2090
October	1st to 10th	Day	41% 4 8% 19% 25% 3	3330
	11th to 20th	Day	31% 4 9% 26% 26% 4	3140
	21st to end	Day	32% 3 16% 27% 20% 3	3116
November	1st to 10th	Day	36% 4 13% 27% 17% 3	1708
	11th to 20th	Day	41% 4 11% 24% 17% 3	1710
	21st to end	Day	42% 3 13% 29% 11% 2	1620
December	1st to 10th	Day	51% 3 14% 20% 12% 1	1520
	11th to 20th	Day	44% 4 16% 22% 12% 2	1906
	21st to end	Day	55% 4 11% 21% 8%	2772
January	1st to 10th	Night	42% 2 14% 28% 11% 3	4429
	11th to 20th	Night	48% 3 13% 23% 10% 3	4440
	21st to end	Night	56% 3 9% 21% 10% 1	4725
February	1st to 10th	Night	48% 4 13% 22% 11% 2	2458
	11th to 20th	Night	46% 5% 10% 19% 17% 3	2220
	21st to end	Night	46% 3 9% 24% 14% 4	1884
March	1st to 10th	Night	53% 4 10% 19% 11% 2	3734
	11th to 20th	Night	41% 3 15% 26% 13% 2	3672
	21st to end	Night	46% 3 7% 15% 23% 6%	3467
April	1st to 10th	Night	49% 4 10% 20% 14% 2	1900
	11th to 20th	Night	48% 4 10% 19% 18% 1	1875
	21st to end	Night	47% 3 9% 22% 16% 3	1834
May	1st to 10th	Night	56% 5% 12% 17% 10% 2	2840
	11th to 20th	Night	53% 4 14% 18% 9% 1	2538
	21st to end	Night	40% 5% 16% 24% 12% 3	2739
June	1st to 10th	Night	43% 6% 11% 23% 16% 1	1520
	11th to 20th	Night	40% 5% 19% 25% 11% 1	1520
	21st to end	Night	37% 6% 16% 27% 14% 1	1520
July	1st to 10th	Night	41% 7% 15% 20% 15% 1	2480
	11th to 20th	Night	43% 6% 14% 24% 12%	2472
	21st to end	Night	46% 6% 14% 15% 18% 2	2651
August	1st to 10th	Night	52% 7% 14% 18% 8% 1	2607
	11th to 20th	Night	43% 5% 14% 29% 9%	3127
	21st to end	Night	32% 4 12% 36% 15% 1	3476
September	1st to 10th	Night	40% 4 10% 27% 17% 1	1900
	11th to 20th	Night	31% 4 11% 27% 26% 2	1995
	21st to end	Night	42% 5% 8% 22% 22% 1	2090
October	1st to 10th	Night	42% 5% 11% 22% 19% 1	3628
	11th to 20th	Night	29% 3 10% 29% 26% 4	3779
	21st to end	Night	35% 3 14% 29% 17% 2	4431
November	1st to 10th	Night	38% 4 12% 23% 20% 3	2470
	11th to 20th	Night	43% 4 10% 23% 18% 3	2470
	21st to end	Night	40% 4 14% 31% 10% 1	2555
December	1st to 10th	Night	48% 3 12% 23% 12% 1	2660
	11th to 20th	Night	48% 4 14% 19% 14% 2	3288
	21st to end	Night	54% 3 12% 20% 10%	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	31% 26% 25% 14% 4	180
	11th to 20th	Day	37% 23% 26% 11% 3	180
	21st to end	Day	24% 28% 33% 10% 3 2	240
February	1st to 10th	Day	34% 28% 28% 8% 2	280
	11th to 20th	Day	28% 28% 31% 12% 1	456
	21st to end	Day	33% 22% 29% 13% 3	382
March	1st to 10th	Day	29% 20% 34% 14% 3	460
	11th to 20th	Day	31% 23% 28% 14% 3 1	460
	21st to end	Day	31% 22% 30% 10% 4 2	506
April	1st to 10th	Day	34% 23% 24% 11% 6% 1	460
	11th to 20th	Day	26% 26% 28% 12% 7% 1	452
	21st to end	Day	30% 17% 33% 14% 4 2	460
May	1st to 10th	Day	35% 18% 26% 13% 5% 2	463
	11th to 20th	Day	23% 18% 32% 19% 7% 1	487
	21st to end	Day	19% 12% 28% 27% 11% 3	529
June	1st to 10th	Day	21% 11% 30% 24% 12% 1	490
	11th to 20th	Day	17% 13% 31% 23% 13% 2	490
	21st to end	Day	16% 14% 29% 25% 14% 2	490
July	1st to 10th	Day	15% 8% 30% 29% 13% 4	485
	11th to 20th	Day	13% 6% 29% 32% 17% 2	484
	21st to end	Day	14% 9% 33% 29% 14% 2	532
August	1st to 10th	Day	16% 9% 26% 29% 15% 5%	486
	11th to 20th	Day	16% 7% 28% 28% 15% 6%	479
	21st to end	Day	12% 9% 29% 28% 14% 7%	539
September	1st to 10th	Day	20% 13% 22% 22% 16% 7%	490
	11th to 20th	Day	13% 10% 27% 23% 16% 11%	490
	21st to end	Day	22% 12% 29% 21% 11% 5%	490
October	1st to 10th	Day	29% 11% 24% 18% 14% 4	490
	11th to 20th	Day	18% 20% 28% 22% 10% 2	490
	21st to end	Day	29% 12% 27% 21% 10% 1	441
November	1st to 10th	Day	21% 17% 26% 23% 11% 2	378
	11th to 20th	Day	30% 21% 26% 16% 6% 1	370
	21st to end	Day	24% 22% 29% 19% 5% 1	280
December	1st to 10th	Day	25% 27% 33% 11% 4 1	180
	11th to 20th	Day	33% 26% 28% 12% 1	180
	21st to end	Day	26% 26% 28% 15% 5%	198
January	1st to 10th	Night	21% 20% 36% 20% 3	760
	11th to 20th	Night	26% 21% 28% 21% 3	760
	21st to end	Night	20% 24% 32% 21% 3	836
February	1st to 10th	Night	24% 20% 32% 23% 1	760
	11th to 20th	Night	23% 22% 37% 17% 1	743
	21st to end	Night	26% 22% 30% 19% 3	628
March	1st to 10th	Night	24% 21% 32% 19% 4	760
	11th to 20th	Night	24% 24% 30% 19% 4	760
	21st to end	Night	24% 22% 31% 17% 5%	836
April	1st to 10th	Night	25% 21% 32% 19% 4	760
	11th to 20th	Night	24% 17% 31% 23% 5%	751
	21st to end	Night	24% 19% 30% 20% 6%	694
May	1st to 10th	Night	27% 16% 30% 22% 5% 1	570
	11th to 20th	Night	23% 13% 33% 26% 5%	403
	21st to end	Night	18% 7% 26% 38% 11%	411
June	1st to 10th	Night	17% 8% 29% 33% 12% 1	380
	11th to 20th	Night	17% 7% 27% 33% 15% 1	380
	21st to end	Night	16% 4 23% 44% 12% 1	380
July	1st to 10th	Night	16% 5% 19% 39% 21% 1	370
	11th to 20th	Night	14% 4 21% 44% 15% 2	368
	21st to end	Night	14% 4 23% 41% 17%	416
August	1st to 10th	Night	13% 3 25% 41% 16% 2	437
	11th to 20th	Night	15% 4 19% 40% 20% 2	750
	21st to end	Night	17% 5% 18% 37% 21% 2	836
September	1st to 10th	Night	18% 6% 26% 32% 15% 3	760
	11th to 20th	Night	16% 7% 23% 31% 20% 4	760
	21st to end	Night	22% 7% 25% 30% 14% 2	760
October	1st to 10th	Night	24% 11% 23% 27% 14% 2	760
	11th to 20th	Night	18% 13% 29% 28% 10% 1	760
	21st to end	Night	26% 13% 26% 28% 7%	836
November	1st to 10th	Night	18% 13% 30% 28% 10% 1	760
	11th to 20th	Night	23% 18% 29% 22% 7% 1	760
	21st to end	Night	19% 18% 29% 26% 7% 1	760
December	1st to 10th	Night	27% 17% 30% 21% 5%	760
	11th to 20th	Night	23% 20% 30% 23% 4	760
	21st to end	Night	27% 18% 31% 22% 2	836

Page generated at 2024-11-03 02:11:19. Version ac07

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