Argonia Launch Site
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Argonia Launch Site clear sky chart from 2005-11-06 to 2025-06-10.

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	9% 5% 2 5% 3 3 4 3 5% 7% 53%	119939
	Night	9% 4 2 4 3 3 3 3 5% 7% 57%	118528
Transparency	Day	19% 39% 6% 17% 15% 4	123685
	Night	18% 38% 6% 17% 16% 5%	122899
Seeing	Day	12% 8% 28% 31% 17% 4	16285
	Night	11% 9% 32% 35% 12% 1	26238

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	12% 5% 2 6% 4 4 4 4 5% 7% 47%	4077
	11th to 20th	Day	6% 7% 3 7% 4 5% 5% 3 5% 6% 51%	4080
	21st to end	Day	11% 8% 3 7% 3 3 2 2 3 6% 51%	4488
February	1st to 10th	Day	9% 10% 3 7% 5% 3 4 2 4 7% 45%	1850
	11th to 20th	Day	7% 7% 4 6% 4 3 3 4 5% 5% 53%	1949
	21st to end	Day	8% 6% 2 4 4 4 3 3 5% 6% 55%	1650
March	1st to 10th	Day	7% 6% 2 5% 3 4 2 2 3 5% 60%	4780
	11th to 20th	Day	8% 5% 1 4 3 3 3 3 5% 7% 58%	4980
	21st to end	Day	9% 5% 2 5% 4 5% 5% 4 6% 9% 45%	5462
April	1st to 10th	Day	10% 6% 2 5% 3 2 4 4 5% 7% 53%	2200
	11th to 20th	Day	13% 6% 3 5% 4 3 4 3 4 6% 48%	2446
	21st to end	Day	16% 5% 2 5% 4 4 4 3 4 7% 46%	2600
May	1st to 10th	Day	19% 6% 2 6% 4 3 3 3 5% 5% 44%	5862
	11th to 20th	Day	10% 4 2 4 3 3 4 3 5% 6% 57%	5862
	21st to end	Day	18% 6% 3 6% 4 4 4 3 5% 5% 43%	6434
June	1st to 10th	Day	6% 4 2 4 4 3 5% 4 6% 10% 52%	2588
	11th to 20th	Day	6% 4 1 5% 4 4 4 4 6% 8% 54%	2470
	21st to end	Day	6% 3 1 3 3 3 3 3 5% 9% 58%	2470
July	1st to 10th	Day	9% 4 2 5% 4 3 4 4 6% 7% 51%	4120
	11th to 20th	Day	5% 3 1 4 3 3 4 4 6% 10% 56%	4120
	21st to end	Day	4 3 1 4 4 4 5% 5% 7% 10% 54%	4465
August	1st to 10th	Day	7% 3 2 4 3 4 5% 4 6% 9% 53%	4104
	11th to 20th	Day	7% 3 1 4 3 3 4 4 6% 8% 55%	4041
	21st to end	Day	4 3 1 4 3 3 4 3 5% 9% 62%	4310
September	1st to 10th	Day	8% 5% 1 5% 3 3 4 3 4 6% 57%	2090
	11th to 20th	Day	10% 4 2 5% 4 4 4 3 4 6% 54%	2090
	21st to end	Day	7% 4 2 5% 3 3 3 3 4 6% 59%	2090
October	1st to 10th	Day	10% 3 1 4 4 3 3 2 4 6% 60%	2051
	11th to 20th	Day	10% 3 1 3 2 2 3 2 3 5% 65%	1900
	21st to end	Day	11% 5% 2 4 3 3 2 2 3 5% 59%	2090
November	1st to 10th	Day	8% 3 1 3 3 2 3 3 5% 6% 64%	1801
	11th to 20th	Day	7% 6% 2 4 3 3 3 2 4 5% 62%	1800
	21st to end	Day	12% 5% 1 3 3 2 2 2 4 6% 61%	1800
December	1st to 10th	Day	5% 5% 2 4 2 2 3 2 3 6% 68%	2940
	11th to 20th	Day	7% 4 2 5% 3 3 3 2 4 6% 60%	3391
	21st to end	Day	14% 9% 3 8% 4 4 3 3 5% 6% 40%	4488
January	1st to 10th	Night	12% 6% 2 5% 3 3 4 3 5% 6% 50%	5888
	11th to 20th	Night	4 3 1 5% 4 4 5% 4 5% 7% 59%	5900
	21st to end	Night	13% 7% 3 5% 2 2 3 2 3 4 55%	6490
February	1st to 10th	Night	10% 9% 2 6% 3 3 3 3 5% 6% 50%	2567
	11th to 20th	Night	11% 7% 3 6% 3 3 3 3 4 6% 51%	2338
	21st to end	Night	8% 5% 2 4 4 3 4 3 4 5% 57%	1980
March	1st to 10th	Night	6% 5% 2 5% 3 3 3 3 4 5% 61%	5080
	11th to 20th	Night	6% 3 1 4 3 3 3 3 5% 7% 62%	4980
	21st to end	Night	8% 5% 2 5% 4 4 4 4 5% 7% 51%	5467
April	1st to 10th	Night	11% 4 1 4 4 4 3 4 5% 7% 55%	2200
	11th to 20th	Night	13% 5% 2 5% 3 3 3 3 5% 7% 52%	1899
	21st to end	Night	15% 5% 2 5% 3 3 3 3 4 7% 50%	1800
May	1st to 10th	Night	18% 5% 2 4 4 3 3 3 5% 6% 47%	4053
	11th to 20th	Night	9% 4 1 4 3 3 3 2 5% 9% 57%	4053
	21st to end	Night	16% 5% 2 4 3 2 3 3 4 8% 50%	4443
June	1st to 10th	Night	5% 3 2 4 4 3 4 3 6% 11% 54%	1796
	11th to 20th	Night	5% 2 1 3 3 4 5% 4 7% 9% 55%	1710
	21st to end	Night	6% 2 1 4 3 3 3 4 6% 9% 61%	1710
July	1st to 10th	Night	7% 4 2 5% 3 4 4 3 7% 10% 52%	2850
	11th to 20th	Night	3 3 1 4 3 3 4 3 6% 11% 59%	2850
	21st to end	Night	5% 3 1 4 3 4 4 5% 7% 11% 54%	3098
August	1st to 10th	Night	4 3 1 4 3 4 5% 5% 6% 10% 55%	2836
	11th to 20th	Night	4 3 2 4 3 4 5% 4 7% 9% 55%	2798
	21st to end	Night	3 3 1 4 3 3 4 4 5% 8% 64%	3324
September	1st to 10th	Night	7% 4 1 4 3 3 4 3 4 6% 59%	2090
	11th to 20th	Night	8% 5% 1 5% 4 4 4 4 6% 7% 53%	2090
	21st to end	Night	7% 3 1 4 3 3 4 3 5% 6% 61%	2090
October	1st to 10th	Night	8% 4 2 4 3 3 3 3 4 6% 59%	2109
	11th to 20th	Night	9% 3 1 3 2 2 2 2 3 5% 67%	2280
	21st to end	Night	10% 4 2 3 2 2 2 2 3 4 65%	2508
November	1st to 10th	Night	9% 4 2 3 2 2 3 2 4 5% 65%	2495
	11th to 20th	Night	8% 3 1 4 3 3 4 3 5% 5% 62%	2600
	21st to end	Night	10% 5% 1 3 3 2 3 2 4 6% 60%	2600
December	1st to 10th	Night	5% 4 1 3 2 2 3 3 4 6% 67%	4250
	11th to 20th	Night	7% 4 2 5% 3 3 3 3 4 5% 62%	4816
	21st to end	Night	16% 7% 2 5% 3 3 3 2 4 6% 49%	6490

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	32% 25% 10% 18% 13% 2	4078
	11th to 20th	Day	28% 26% 8% 16% 18% 4	4080
	21st to end	Day	29% 27% 4 16% 23% 2	4488
February	1st to 10th	Day	16% 61% 5% 9% 7% 2	1850
	11th to 20th	Day	14% 60% 5% 11% 8% 2	1959
	21st to end	Day	13% 60% 2 8% 11% 6%	1650
March	1st to 10th	Day	20% 28% 3 12% 18% 19%	4780
	11th to 20th	Day	16% 28% 6% 15% 21% 15%	4980
	21st to end	Day	25% 28% 8% 26% 12% 1	5464
April	1st to 10th	Day	13% 61% 4 13% 8% 1	2200
	11th to 20th	Day	15% 62% 4 10% 7% 2	2446
	21st to end	Day	17% 61% 5% 12% 4 1	2600
May	1st to 10th	Day	33% 29% 6% 14% 16% 3	5900
	11th to 20th	Day	21% 27% 6% 15% 21% 10%	5866
	21st to end	Day	34% 28% 5% 12% 16% 5%	6447
June	1st to 10th	Day	12% 62% 7% 13% 6% 1	2588
	11th to 20th	Day	11% 65% 5% 11% 7% 1	2470
	21st to end	Day	6% 63% 7% 13% 10% 1	2470
July	1st to 10th	Day	21% 37% 7% 17% 14% 5%	4056
	11th to 20th	Day	16% 36% 7% 25% 15% 2	4051
	21st to end	Day	13% 38% 11% 21% 15% 1	4325
August	1st to 10th	Day	19% 38% 8% 20% 15% 2	4090
	11th to 20th	Day	15% 39% 14% 18% 12% 1	4080
	21st to end	Day	12% 38% 11% 26% 13% 1	4309
September	1st to 10th	Day	9% 59% 5% 14% 9% 4	2090
	11th to 20th	Day	11% 59% 4 15% 10% 1	2090
	21st to end	Day	15% 59% 3 11% 9% 3	2090
October	1st to 10th	Day	11% 36% 3 9% 32% 9%	3402
	11th to 20th	Day	7% 37% 5% 15% 28% 8%	3140
	21st to end	Day	15% 36% 3 17% 21% 7%	3428
November	1st to 10th	Day	12% 55% 3 14% 12% 5%	1801
	11th to 20th	Day	13% 56% 3 11% 14% 4	1800
	21st to end	Day	13% 56% 4 14% 11% 3	1800
December	1st to 10th	Day	11% 35% 3 33% 18% 1	2940
	11th to 20th	Day	18% 30% 3 25% 22% 3	3389
	21st to end	Day	39% 25% 3 22% 10% 1	4488
January	1st to 10th	Night	31% 25% 8% 24% 10% 2	5888
	11th to 20th	Night	20% 26% 10% 17% 22% 5%	5900
	21st to end	Night	27% 27% 4 15% 23% 4	6490
February	1st to 10th	Night	13% 61% 4 12% 7% 3	2567
	11th to 20th	Night	15% 60% 6% 10% 7% 2	2338
	21st to end	Night	11% 61% 1 9% 11% 7%	1980
March	1st to 10th	Night	19% 28% 4 15% 22% 13%	5080
	11th to 20th	Night	14% 27% 4 15% 22% 19%	4980
	21st to end	Night	22% 29% 7% 30% 10% 2	5467
April	1st to 10th	Night	12% 61% 5% 10% 10% 3	2200
	11th to 20th	Night	13% 62% 5% 11% 8% 2	1899
	21st to end	Night	15% 61% 5% 10% 7% 2	1800
May	1st to 10th	Night	29% 29% 9% 13% 16% 5%	4080
	11th to 20th	Night	19% 28% 9% 17% 17% 9%	4054
	21st to end	Night	26% 28% 9% 14% 18% 4	4452
June	1st to 10th	Night	10% 62% 10% 10% 7% 2	1796
	11th to 20th	Night	10% 65% 6% 12% 7% 1	1710
	21st to end	Night	7% 63% 5% 14% 10% 1	1710
July	1st to 10th	Night	18% 37% 10% 17% 14% 4	2805
	11th to 20th	Night	12% 36% 6% 25% 19% 1	2796
	21st to end	Night	13% 37% 12% 24% 14% 1	2999
August	1st to 10th	Night	15% 38% 8% 17% 18% 4	2826
	11th to 20th	Night	15% 40% 12% 16% 14% 2	2825
	21st to end	Night	12% 38% 9% 30% 10% 1	3324
September	1st to 10th	Night	10% 59% 5% 12% 10% 4	2090
	11th to 20th	Night	10% 59% 6% 14% 10% 1	2090
	21st to end	Night	13% 59% 4 10% 11% 3	2090
October	1st to 10th	Night	10% 36% 3 7% 32% 12%	3512
	11th to 20th	Night	6% 36% 3 17% 25% 13%	3779
	21st to end	Night	12% 36% 4 15% 27% 6%	4120
November	1st to 10th	Night	13% 55% 4 12% 11% 5%	2495
	11th to 20th	Night	12% 56% 3 12% 12% 4	2600
	21st to end	Night	14% 56% 3 13% 11% 3	2600
December	1st to 10th	Night	10% 35% 4 35% 15% 2	4250
	11th to 20th	Night	17% 31% 3 24% 20% 6%	4817
	21st to end	Night	32% 25% 5% 24% 11% 3	6490

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	14% 10% 35% 30% 9% 2	300
	11th to 20th	Day	17% 16% 36% 25% 6%	300
	21st to end	Day	11% 12% 42% 28% 6% 1	330
February	1st to 10th	Day	17% 17% 40% 21% 5%	300
	11th to 20th	Day	17% 17% 38% 24% 5%	300
	21st to end	Day	10% 17% 44% 22% 6%	249
March	1st to 10th	Day	14% 16% 43% 22% 6%	300
	11th to 20th	Day	17% 16% 41% 21% 5%	300
	21st to end	Day	19% 17% 42% 18% 3 1	330
April	1st to 10th	Day	15% 24% 35% 22% 4	300
	11th to 20th	Day	16% 18% 42% 21% 3	564
	21st to end	Day	22% 13% 36% 20% 8% 1	700
May	1st to 10th	Day	17% 10% 36% 28% 7% 2	703
	11th to 20th	Day	16% 9% 31% 26% 15% 3	725
	21st to end	Day	16% 9% 30% 27% 14% 3	789
June	1st to 10th	Day	7% 5% 22% 37% 24% 5%	726
	11th to 20th	Day	6% 3 30% 39% 19% 3	680
	21st to end	Day	6% 4 27% 42% 18% 3	680
July	1st to 10th	Day	8% 1 14% 34% 34% 9%	671
	11th to 20th	Day	3 3 11% 45% 31% 7%	668
	21st to end	Day	7% 1 11% 39% 33% 10%	739
August	1st to 10th	Day	7% 2 14% 41% 30% 5%	676
	11th to 20th	Day	8% 2 14% 38% 32% 6%	665
	21st to end	Day	6% 2 14% 35% 35% 10%	630
September	1st to 10th	Day	7% 2 10% 35% 37% 9%	300
	11th to 20th	Day	6% 2 16% 42% 29% 4	300
	21st to end	Day	11% 5% 21% 37% 18% 8%	300
October	1st to 10th	Day	11% 6% 28% 27% 21% 8%	300
	11th to 20th	Day	10% 9% 39% 30% 12% 1	300
	21st to end	Day	18% 12% 32% 25% 11% 2	330
November	1st to 10th	Day	12% 9% 35% 28% 13% 3	300
	11th to 20th	Day	15% 11% 38% 21% 13% 2	300
	21st to end	Day	16% 13% 32% 28% 10% 1	300
December	1st to 10th	Day	10% 10% 38% 29% 10% 3	300
	11th to 20th	Day	11% 10% 39% 30% 10%	300
	21st to end	Day	17% 18% 33% 27% 5%	330
January	1st to 10th	Night	10% 10% 38% 34% 7%	1000
	11th to 20th	Night	11% 11% 36% 35% 7%	1000
	21st to end	Night	13% 11% 35% 35% 6%	1100
February	1st to 10th	Night	14% 12% 40% 30% 4	967
	11th to 20th	Night	16% 13% 38% 29% 4	784
	21st to end	Night	13% 14% 38% 30% 5%	660
March	1st to 10th	Night	11% 13% 36% 35% 5%	675
	11th to 20th	Night	17% 11% 38% 29% 5%	600
	21st to end	Night	17% 13% 39% 25% 5%	660
April	1st to 10th	Night	15% 14% 41% 23% 7%	600
	11th to 20th	Night	18% 13% 42% 22% 4	593
	21st to end	Night	18% 14% 38% 24% 6% 1	600
May	1st to 10th	Night	17% 8% 36% 30% 8% 1	600
	11th to 20th	Night	11% 8% 33% 34% 13% 1	591
	21st to end	Night	12% 8% 32% 32% 14% 2	650
June	1st to 10th	Night	7% 4 28% 41% 20% 1	599
	11th to 20th	Night	6% 3 36% 42% 13%	570
	21st to end	Night	5% 2 33% 45% 14%	570
July	1st to 10th	Night	6% 2 17% 47% 27% 1	555
	11th to 20th	Night	4 1 18% 48% 27% 2	552
	21st to end	Night	6% 2 13% 47% 31% 2	624
August	1st to 10th	Night	4 1 21% 47% 25% 1	567
	11th to 20th	Night	7% 2 15% 51% 24% 1	564
	21st to end	Night	3 2 14% 44% 34% 3	627
September	1st to 10th	Night	9% 2 20% 45% 22% 1	570
	11th to 20th	Night	10% 2 26% 41% 19% 2	570
	21st to end	Night	9% 5% 26% 38% 20% 1	570
October	1st to 10th	Night	10% 5% 29% 34% 20% 1	589
	11th to 20th	Night	11% 8% 38% 36% 8%	760
	21st to end	Night	13% 11% 34% 31% 11% 1	836
November	1st to 10th	Night	11% 7% 37% 33% 11% 1	935
	11th to 20th	Night	10% 11% 38% 32% 9% 1	1000
	21st to end	Night	14% 11% 30% 35% 9%	1000
December	1st to 10th	Night	12% 9% 36% 34% 9%	1000
	11th to 20th	Night	15% 9% 36% 34% 6%	1000
	21st to end	Night	15% 12% 33% 34% 5%	1100

Page generated at 2025-06-07 09:28:13. Version ac07

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