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 2024-04-25.

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	17% 7% 3 6% 5% 3 4 5% 5% 7% 38%	83175
	Night	17% 8% 3 6% 5% 3 4 4 5% 6% 39%	85910
Transparency	Day	45% 5% 11% 23% 14% 2	82880
	Night	45% 4 12% 23% 14% 2	85739
Seeing	Day	24% 17% 28% 19% 9% 2	14185
	Night	22% 15% 28% 26% 8% 1	23438

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% 8% 3 5% 5% 3 4 4 4 5% 44%	2517
	11th to 20th	Day	15% 10% 4 7% 8% 3 5% 4 5% 6% 33%	2520
	21st to end	Day	21% 13% 6% 7% 5% 3 3 3 5% 5% 30%	2914
February	1st to 10th	Day	18% 9% 3 7% 6% 3 4 5% 5% 7% 34%	1720
	11th to 20th	Day	15% 8% 3 6% 5% 4 4 4 5% 7% 38%	1848
	21st to end	Day	19% 9% 3 7% 5% 3 5% 3 4 6% 36%	1570
March	1st to 10th	Day	26% 10% 4 7% 5% 3 3 3 4 4 33%	3116
	11th to 20th	Day	11% 7% 3 6% 6% 3 5% 6% 5% 7% 41%	3283
	21st to end	Day	21% 7% 3 6% 5% 3 4 4 4 6% 37%	4164
April	1st to 10th	Day	19% 9% 4 6% 5% 3 5% 4 4 6% 35%	2280
	11th to 20th	Day	17% 6% 3 6% 5% 3 4 5% 5% 7% 38%	2254
	21st to end	Day	21% 6% 3 5% 5% 3 4 5% 4 6% 39%	2271
May	1st to 10th	Day	22% 9% 3 6% 4 3 4 5% 5% 7% 33%	2340
	11th to 20th	Day	19% 6% 2 5% 5% 3 4 4 6% 8% 38%	2464
	21st to end	Day	14% 6% 3 6% 5% 3 5% 5% 6% 8% 40%	2725
June	1st to 10th	Day	18% 5% 2 5% 5% 4 6% 5% 7% 9% 35%	2520
	11th to 20th	Day	15% 7% 4 6% 5% 3 6% 5% 6% 9% 35%	2520
	21st to end	Day	12% 7% 3 6% 6% 3 5% 6% 6% 9% 38%	2520
July	1st to 10th	Day	12% 6% 3 6% 5% 3 6% 5% 6% 8% 40%	2520
	11th to 20th	Day	11% 5% 2 5% 5% 3 6% 5% 7% 10% 40%	2520
	21st to end	Day	12% 5% 3 6% 6% 3 6% 5% 7% 8% 39%	2744
August	1st to 10th	Day	11% 6% 3 6% 6% 4 5% 7% 7% 9% 37%	2431
	11th to 20th	Day	12% 7% 3 4 5% 3 6% 7% 8% 9% 38%	2126
	21st to end	Day	13% 5% 2 6% 5% 3 5% 5% 5% 10% 42%	2376
September	1st to 10th	Day	13% 6% 3 5% 6% 4 4 5% 5% 7% 41%	2160
	11th to 20th	Day	13% 4 2 5% 4 3 4 4 5% 7% 49%	2069
	21st to end	Day	17% 6% 3 5% 4 3 4 5% 5% 7% 42%	1980
October	1st to 10th	Day	23% 7% 2 4 5% 2 4 4 4 5% 41%	1900
	11th to 20th	Day	14% 7% 2 4 5% 3 4 5% 5% 7% 43%	1800
	21st to end	Day	23% 6% 2 5% 6% 3 4 4 5% 7% 35%	1804
November	1st to 10th	Day	14% 7% 2 4 5% 2 4 3 4 7% 49%	1671
	11th to 20th	Day	18% 7% 2 4 4 3 3 3 6% 6% 43%	1710
	21st to end	Day	18% 7% 3 5% 4 2 4 4 5% 7% 42%	1620
December	1st to 10th	Day	18% 8% 3 8% 6% 3 4 4 4 7% 34%	1520
	11th to 20th	Day	20% 7% 2 5% 5% 2 4 4 4 7% 41%	1906
	21st to end	Day	20% 11% 5% 7% 6% 3 4 4 5% 7% 29%	2772
January	1st to 10th	Night	16% 7% 3 5% 5% 3 4 4 5% 7% 43%	4429
	11th to 20th	Night	15% 8% 4 8% 6% 3 5% 5% 4 6% 36%	4440
	21st to end	Night	23% 10% 4 7% 6% 2 4 3 4 5% 31%	4725
February	1st to 10th	Night	16% 10% 4 5% 5% 4 5% 3 4 6% 39%	2458
	11th to 20th	Night	15% 8% 3 6% 6% 3 5% 6% 5% 7% 36%	2218
	21st to end	Night	18% 7% 3 7% 5% 3 3 5% 5% 6% 38%	1884
March	1st to 10th	Night	24% 11% 3 5% 4 2 3 4 5% 6% 33%	3724
	11th to 20th	Night	12% 6% 2 7% 7% 3 5% 5% 5% 7% 41%	3671
	21st to end	Night	18% 10% 3 5% 4 3 4 4 5% 5% 39%	3467
April	1st to 10th	Night	17% 9% 3 6% 7% 3 6% 4 5% 7% 33%	1900
	11th to 20th	Night	19% 7% 3 6% 6% 4 4 4 4 6% 38%	1875
	21st to end	Night	20% 7% 4 5% 4 3 4 3 5% 5% 39%	1788
May	1st to 10th	Night	23% 6% 4 7% 6% 3 4 5% 4 6% 32%	1620
	11th to 20th	Night	17% 8% 3 6% 5% 3 4 4 5% 7% 38%	1443
	21st to end	Night	15% 6% 3 5% 5% 3 5% 4 6% 8% 40%	1550
June	1st to 10th	Night	17% 6% 3 5% 4 3 4 5% 5% 8% 40%	1440
	11th to 20th	Night	14% 6% 3 6% 5% 3 4 5% 7% 8% 39%	1440
	21st to end	Night	13% 5% 2 4 5% 3 4 5% 7% 10% 43%	1440
July	1st to 10th	Night	12% 7% 2 5% 5% 3 5% 6% 6% 8% 42%	1440
	11th to 20th	Night	13% 6% 2 5% 5% 4 5% 6% 7% 9% 39%	1440
	21st to end	Night	10% 5% 2 6% 5% 3 6% 6% 7% 8% 43%	1574
August	1st to 10th	Night	8% 6% 2 5% 6% 4 5% 6% 6% 9% 43%	1487
	11th to 20th	Night	12% 6% 3 6% 6% 4 6% 5% 7% 9% 36%	1774
	21st to end	Night	16% 5% 2 5% 4 3 3 4 5% 6% 46%	1980
September	1st to 10th	Night	15% 6% 3 5% 5% 3 4 4 4 6% 46%	1800
	11th to 20th	Night	12% 6% 2 4 3 2 3 3 4 6% 54%	1890
	21st to end	Night	17% 6% 3 5% 4 3 4 4 5% 6% 45%	1980
October	1st to 10th	Night	20% 6% 3 6% 5% 2 3 3 4 6% 42%	2058
	11th to 20th	Night	15% 6% 2 5% 4 3 4 4 5% 7% 44%	2160
	21st to end	Night	21% 8% 2 5% 5% 3 4 3 5% 6% 37%	2551
November	1st to 10th	Night	14% 7% 2 4 4 3 4 4 5% 6% 46%	2407
	11th to 20th	Night	19% 6% 3 4 4 3 3 4 5% 6% 43%	2470
	21st to end	Night	14% 6% 3 5% 5% 3 5% 5% 5% 7% 42%	2555
December	1st to 10th	Night	19% 8% 3 6% 5% 3 4 5% 5% 6% 36%	2660
	11th to 20th	Night	19% 8% 3 6% 5% 3 5% 5% 5% 6% 35%	3288
	21st to end	Night	22% 11% 4 7% 5% 3 4 4 5% 6% 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% 3 10% 21% 16% 3	2271
May	1st to 10th	Day	51% 5% 9% 20% 13% 2	2340
	11th to 20th	Day	44% 5% 10% 22% 16% 2	2468
	21st to end	Day	42% 6% 16% 22% 13% 2	2725
June	1st to 10th	Day	44% 7% 14% 23% 12% 1	2520
	11th to 20th	Day	46% 6% 12% 24% 10% 2	2520
	21st to end	Day	42% 7% 12% 26% 12% 1	2520
July	1st to 10th	Day	41% 7% 13% 21% 16% 2	2450
	11th to 20th	Day	39% 5% 16% 26% 14% 1	2445
	21st to end	Day	41% 6% 13% 21% 17% 2	2591
August	1st to 10th	Day	41% 6% 13% 26% 12% 1	2417
	11th to 20th	Day	39% 6% 18% 25% 12%	2126
	21st to end	Day	39% 5% 12% 25% 17% 1	2376
September	1st to 10th	Day	41% 6% 11% 24% 17% 2	2160
	11th to 20th	Day	36% 4 9% 26% 24% 2	2069
	21st to end	Day	41% 6% 10% 23% 18% 3	1980
October	1st to 10th	Day	46% 4 8% 24% 15% 3	1900
	11th to 20th	Day	39% 5% 13% 27% 14% 2	1800
	21st to end	Day	49% 3 11% 21% 14% 2	1804
November	1st to 10th	Day	37% 4 13% 27% 17% 3	1671
	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 8% 23% 16% 4	1788
May	1st to 10th	Night	53% 4 10% 17% 13% 2	1620
	11th to 20th	Night	46% 4 10% 21% 16% 2	1444
	21st to end	Night	42% 5% 17% 22% 12% 2	1551
June	1st to 10th	Night	44% 6% 11% 23% 15% 2	1440
	11th to 20th	Night	41% 5% 18% 24% 11% 1	1440
	21st to end	Night	36% 6% 16% 27% 14% 1	1440
July	1st to 10th	Night	39% 6% 14% 24% 15% 3	1400
	11th to 20th	Night	39% 6% 15% 29% 11% 1	1392
	21st to end	Night	36% 8% 16% 22% 16% 3	1486
August	1st to 10th	Night	35% 7% 17% 26% 14% 1	1477
	11th to 20th	Night	43% 7% 16% 23% 10% 1	1774
	21st to end	Night	38% 5% 13% 24% 19% 1	1980
September	1st to 10th	Night	41% 4 10% 27% 16% 1	1800
	11th to 20th	Night	32% 4 11% 26% 25% 2	1890
	21st to end	Night	41% 5% 7% 23% 23% 1	1980
October	1st to 10th	Night	45% 4 11% 23% 14% 2	2058
	11th to 20th	Night	39% 4 13% 30% 13% 1	2160
	21st to end	Night	48% 3 12% 21% 14% 1	2551
November	1st to 10th	Night	38% 4 12% 22% 20% 4	2407
	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	31% 17% 32% 13% 5% 2	437
May	1st to 10th	Day	35% 19% 26% 12% 6% 2	423
	11th to 20th	Day	24% 18% 34% 17% 6% 1	447
	21st to end	Day	19% 11% 27% 27% 12% 3	485
June	1st to 10th	Day	21% 11% 30% 23% 13% 1	450
	11th to 20th	Day	18% 14% 32% 22% 12% 2	450
	21st to end	Day	16% 13% 28% 26% 15% 2	450
July	1st to 10th	Day	15% 9% 29% 30% 14% 4	445
	11th to 20th	Day	14% 6% 28% 32% 18% 3	444
	21st to end	Day	14% 9% 32% 30% 14% 2	488
August	1st to 10th	Day	15% 7% 26% 31% 16% 5%	446
	11th to 20th	Day	17% 6% 28% 27% 15% 7%	439
	21st to end	Day	14% 9% 28% 28% 15% 7%	495
September	1st to 10th	Day	20% 13% 22% 22% 17% 7%	450
	11th to 20th	Day	14% 11% 29% 22% 14% 10%	450
	21st to end	Day	20% 13% 29% 21% 12% 5%	450
October	1st to 10th	Day	31% 9% 24% 18% 14% 4	450
	11th to 20th	Day	18% 20% 28% 23% 9% 2	450
	21st to end	Day	30% 12% 26% 21% 10% 1	407
November	1st to 10th	Day	20% 17% 25% 24% 11% 2	365
	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	25% 19% 30% 20% 5% 1	678
May	1st to 10th	Night	27% 16% 30% 21% 6% 1	540
	11th to 20th	Night	23% 14% 33% 25% 5%	382
	21st to end	Night	19% 7% 24% 38% 12% 1	389
June	1st to 10th	Night	18% 8% 29% 32% 13% 1	360
	11th to 20th	Night	18% 7% 26% 32% 16% 1	360
	21st to end	Night	15% 3 23% 46% 12% 1	360
July	1st to 10th	Night	16% 5% 18% 39% 22% 1	350
	11th to 20th	Night	14% 4 21% 43% 16% 2	348
	21st to end	Night	12% 4 23% 42% 18% 1	394
August	1st to 10th	Night	10% 3 26% 42% 16% 2	413
	11th to 20th	Night	14% 4 18% 41% 21% 2	710
	21st to end	Night	17% 5% 18% 36% 21% 2	792
September	1st to 10th	Night	18% 5% 26% 33% 15% 3	720
	11th to 20th	Night	17% 7% 24% 31% 18% 4	720
	21st to end	Night	21% 7% 25% 31% 14% 2	720
October	1st to 10th	Night	25% 11% 22% 27% 14% 2	720
	11th to 20th	Night	19% 13% 29% 29% 10% 1	720
	21st to end	Night	27% 13% 26% 27% 7%	792
November	1st to 10th	Night	18% 13% 30% 29% 10% 1	740
	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 2024-04-22 09:25:42. Version ac07

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