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 2026-10-14.

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% 4 4 4 3 5% 7% 53%	149266
	Night	8% 4 2 4 3 3 4 3 5% 7% 56%	142878
Transparency	Day	21% 32% 7% 19% 16% 4	152970
	Night	19% 33% 7% 19% 17% 5%	147228
Seeing	Day	11% 8% 28% 31% 17% 4	18191
	Night	11% 9% 33% 36% 11% 1	27958

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	10% 5% 2 6% 4 4 4 4 5% 7% 49%	5289
	11th to 20th	Day	5% 7% 2 6% 3 4 4 3 4 5% 56%	5310
	21st to end	Day	12% 7% 3 7% 3 3 2 2 4 6% 50%	5812
February	1st to 10th	Day	9% 10% 3 6% 5% 3 4 3 4 7% 46%	1943
	11th to 20th	Day	7% 7% 3 6% 4 3 3 4 5% 5% 53%	2049
	21st to end	Day	8% 5% 2 4 3 4 3 3 5% 7% 56%	1730
March	1st to 10th	Day	8% 6% 2 5% 3 4 3 2 3 5% 59%	4886
	11th to 20th	Day	8% 5% 1 4 3 3 3 3 5% 7% 58%	5090
	21st to end	Day	9% 5% 2 5% 4 5% 5% 4 6% 9% 46%	5583
April	1st to 10th	Day	9% 5% 2 5% 4 2 3 4 5% 7% 53%	2310
	11th to 20th	Day	13% 6% 2 5% 4 4 4 3 5% 7% 48%	2570
	21st to end	Day	16% 5% 2 5% 4 4 4 3 4 7% 45%	2730
May	1st to 10th	Day	18% 6% 2 6% 3 3 4 3 5% 5% 45%	7617
	11th to 20th	Day	8% 4 2 4 3 3 4 3 5% 6% 57%	7627
	21st to end	Day	19% 7% 3 7% 4 4 4 3 5% 5% 40%	8392
June	1st to 10th	Day	6% 4 2 4 4 3 5% 4 6% 9% 52%	2730
	11th to 20th	Day	6% 4 1 5% 4 4 4 4 6% 8% 53%	2730
	21st to end	Day	7% 4 1 4 3 4 3 4 6% 9% 56%	2730
July	1st to 10th	Day	6% 4 1 5% 4 5% 5% 5% 7% 9% 49%	7680
	11th to 20th	Day	5% 3 1 4 3 4 4 4 6% 10% 54%	7680
	21st to end	Day	3 3 1 4 4 4 5% 4 7% 11% 54%	8337
August	1st to 10th	Day	6% 3 2 5% 4 4 5% 4 5% 7% 56%	6014
	11th to 20th	Day	5% 3 1 4 3 3 4 5% 7% 8% 56%	5948
	21st to end	Day	3 3 1 4 3 3 4 4 6% 9% 60%	6281
September	1st to 10th	Day	7% 5% 1 5% 3 3 4 3 4 6% 57%	2310
	11th to 20th	Day	10% 4 2 6% 4 4 4 3 5% 6% 53%	2310
	21st to end	Day	8% 5% 2 6% 3 3 3 3 5% 6% 56%	2310
October	1st to 10th	Day	10% 3 1 4 3 3 3 2 4 6% 61%	2267
	11th to 20th	Day	10% 3 1 3 2 2 3 3 3 5% 64%	2030
	21st to end	Day	12% 5% 2 4 3 3 2 2 3 5% 58%	2200
November	1st to 10th	Day	7% 3 1 3 2 2 3 3 5% 6% 65%	1893
	11th to 20th	Day	7% 6% 2 4 3 3 3 2 4 6% 61%	1890
	21st to end	Day	12% 5% 1 3 3 2 2 2 4 6% 60%	1890
December	1st to 10th	Day	5% 5% 2 4 2 2 3 2 3 6% 67%	3030
	11th to 20th	Day	7% 4 2 5% 3 3 3 2 4 7% 60%	3481
	21st to end	Day	14% 9% 3 8% 4 4 3 3 5% 6% 41%	4587
January	1st to 10th	Night	12% 6% 2 5% 3 3 4 3 4 6% 52%	7634
	11th to 20th	Night	4 4 2 5% 3 3 4 3 4 6% 62%	7680
	21st to end	Night	14% 7% 3 5% 3 3 3 2 4 5% 53%	8402
February	1st to 10th	Night	10% 8% 2 6% 3 3 3 3 5% 6% 51%	2695
	11th to 20th	Night	11% 7% 3 5% 3 3 3 3 4 7% 51%	2458
	21st to end	Night	8% 5% 2 4 4 3 4 3 4 5% 58%	2076
March	1st to 10th	Night	7% 5% 2 5% 3 3 3 3 4 5% 60%	5194
	11th to 20th	Night	6% 3 1 4 3 3 3 3 5% 6% 62%	5090
	21st to end	Night	8% 5% 2 5% 4 4 4 4 5% 7% 52%	5588
April	1st to 10th	Night	10% 4 1 4 4 4 3 4 5% 7% 55%	2310
	11th to 20th	Night	13% 5% 2 5% 3 3 3 3 5% 7% 52%	1995
	21st to end	Night	15% 5% 2 5% 3 3 3 3 4 7% 50%	1890
May	1st to 10th	Night	15% 5% 2 5% 4 4 4 3 5% 6% 47%	5266
	11th to 20th	Night	8% 3 1 4 3 4 3 3 6% 10% 55%	5265
	21st to end	Night	17% 6% 2 5% 3 3 4 3 5% 8% 45%	5793
June	1st to 10th	Night	5% 4 2 5% 4 3 4 4 7% 11% 52%	1890
	11th to 20th	Night	6% 3 1 4 3 3 5% 4 7% 9% 55%	1890
	21st to end	Night	6% 2 1 4 3 4 3 4 6% 9% 60%	1890
July	1st to 10th	Night	4 3 1 5% 4 4 5% 4 7% 12% 51%	5308
	11th to 20th	Night	3 3 2 5% 4 4 4 4 7% 12% 53%	5307
	21st to end	Night	4 3 1 5% 4 4 4 5% 7% 10% 54%	5770
August	1st to 10th	Night	3 2 1 4 3 4 4 4 6% 9% 59%	4156
	11th to 20th	Night	3 3 2 4 3 3 4 3 7% 11% 58%	4118
	21st to end	Night	3 2 1 3 3 3 4 3 5% 9% 64%	4833
September	1st to 10th	Night	7% 4 1 4 3 3 3 3 4 7% 59%	2310
	11th to 20th	Night	8% 5% 1 5% 4 4 4 4 5% 7% 54%	2310
	21st to end	Night	7% 4 1 4 4 3 4 3 5% 6% 60%	2310
October	1st to 10th	Night	8% 4 2 4 3 3 3 2 4 6% 61%	2331
	11th to 20th	Night	8% 3 1 4 2 2 2 2 3 5% 67%	2437
	21st to end	Night	11% 4 2 3 2 2 2 2 3 4 64%	2640
November	1st to 10th	Night	8% 4 2 3 2 2 3 3 4 5% 65%	2623
	11th to 20th	Night	7% 3 1 4 3 3 3 3 4 5% 62%	2730
	21st to end	Night	11% 5% 1 4 3 2 3 2 4 6% 59%	2730
December	1st to 10th	Night	5% 4 1 3 2 2 3 3 4 6% 67%	4380
	11th to 20th	Night	7% 4 2 4 3 3 3 3 4 5% 63%	4946
	21st to end	Night	15% 6% 2 5% 3 3 3 3 4 6% 49%	6633

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	31% 20% 8% 22% 16% 3	5290
	11th to 20th	Day	25% 20% 7% 23% 18% 6%	5310
	21st to end	Day	31% 21% 4 18% 23% 2	5812
February	1st to 10th	Day	16% 58% 5% 11% 7% 2	1943
	11th to 20th	Day	15% 57% 5% 12% 8% 2	2059
	21st to end	Day	12% 58% 2 9% 13% 6%	1730
March	1st to 10th	Day	21% 27% 3 12% 18% 19%	4886
	11th to 20th	Day	16% 27% 5% 15% 21% 15%	5090
	21st to end	Day	25% 28% 8% 27% 12% 1	5585
April	1st to 10th	Day	13% 58% 4 14% 9% 2	2310
	11th to 20th	Day	15% 59% 5% 10% 7% 3	2570
	21st to end	Day	18% 58% 5% 12% 5% 1	2730
May	1st to 10th	Day	34% 23% 6% 15% 19% 3	7655
	11th to 20th	Day	22% 22% 6% 18% 23% 9%	7631
	21st to end	Day	38% 23% 6% 14% 15% 5%	8405
June	1st to 10th	Day	13% 59% 7% 13% 8% 1	2730
	11th to 20th	Day	13% 59% 6% 12% 8% 1	2730
	21st to end	Day	9% 58% 8% 13% 10% 1	2730
July	1st to 10th	Day	23% 23% 10% 21% 19% 3	7616
	11th to 20th	Day	20% 23% 10% 24% 16% 6%	7611
	21st to end	Day	18% 23% 12% 32% 14% 1	8155
August	1st to 10th	Day	20% 27% 7% 19% 21% 6%	6000
	11th to 20th	Day	16% 28% 13% 24% 17% 1	5987
	21st to end	Day	15% 28% 15% 28% 13% 1	6280
September	1st to 10th	Day	11% 54% 6% 15% 10% 4	2310
	11th to 20th	Day	13% 54% 5% 17% 10% 1	2310
	21st to end	Day	18% 54% 4 12% 9% 3	2310
October	1st to 10th	Day	11% 34% 3 10% 33% 9%	3618
	11th to 20th	Day	8% 35% 5% 16% 28% 8%	3270
	21st to end	Day	16% 35% 3 17% 21% 7%	3538
November	1st to 10th	Day	12% 52% 3 15% 13% 4	1893
	11th to 20th	Day	13% 53% 3 12% 14% 4	1890
	21st to end	Day	14% 53% 5% 15% 10% 3	1890
December	1st to 10th	Day	11% 34% 3 33% 18% 1	3030
	11th to 20th	Day	18% 29% 3 25% 22% 3	3479
	21st to end	Day	38% 25% 3 22% 11% 1	4587
January	1st to 10th	Night	30% 20% 8% 23% 17% 2	7635
	11th to 20th	Night	20% 20% 9% 21% 23% 7%	7680
	21st to end	Night	30% 21% 5% 17% 24% 3	8402
February	1st to 10th	Night	14% 58% 4 14% 7% 3	2695
	11th to 20th	Night	16% 57% 6% 12% 7% 2	2458
	21st to end	Night	11% 58% 2 9% 12% 8%	2076
March	1st to 10th	Night	19% 28% 4 14% 22% 13%	5194
	11th to 20th	Night	14% 27% 4 15% 22% 19%	5090
	21st to end	Night	22% 28% 7% 30% 10% 2	5588
April	1st to 10th	Night	13% 58% 5% 11% 10% 3	2310
	11th to 20th	Night	15% 59% 5% 10% 8% 2	1995
	21st to end	Night	16% 58% 5% 12% 7% 2	1890
May	1st to 10th	Night	30% 24% 8% 14% 20% 4	5293
	11th to 20th	Night	20% 23% 9% 20% 19% 8%	5266
	21st to end	Night	33% 23% 9% 16% 16% 3	5805
June	1st to 10th	Night	12% 59% 10% 10% 7% 2	1890
	11th to 20th	Night	13% 59% 6% 13% 8% 1	1890
	21st to end	Night	10% 58% 7% 14% 10% 1	1890
July	1st to 10th	Night	20% 23% 14% 25% 15% 3	5265
	11th to 20th	Night	19% 24% 11% 23% 17% 5%	5256
	21st to end	Night	17% 23% 11% 34% 15% 1	5641
August	1st to 10th	Night	16% 26% 7% 17% 27% 7%	4146
	11th to 20th	Night	14% 28% 13% 23% 20% 2	4145
	21st to end	Night	13% 27% 14% 31% 14% 1	4833
September	1st to 10th	Night	11% 54% 6% 13% 12% 4	2310
	11th to 20th	Night	12% 54% 6% 17% 11% 1	2310
	21st to end	Night	16% 54% 5% 11% 11% 3	2310
October	1st to 10th	Night	11% 34% 3 8% 33% 12%	3734
	11th to 20th	Night	7% 35% 3 17% 25% 13%	3936
	21st to end	Night	13% 35% 4 15% 27% 6%	4252
November	1st to 10th	Night	13% 52% 4 13% 13% 5%	2623
	11th to 20th	Night	12% 53% 3 13% 13% 4	2730
	21st to end	Night	16% 53% 3 14% 11% 3	2730
December	1st to 10th	Night	11% 34% 4 35% 15% 2	4380
	11th to 20th	Night	16% 30% 4 25% 20% 6%	4947
	21st to end	Night	32% 25% 5% 23% 12% 3	6633

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	12% 10% 38% 29% 9% 2	330
	11th to 20th	Day	16% 17% 36% 25% 6%	330
	21st to end	Day	12% 12% 41% 29% 6% 1	363
February	1st to 10th	Day	16% 16% 41% 21% 6%	330
	11th to 20th	Day	17% 16% 37% 24% 6%	330
	21st to end	Day	10% 16% 46% 23% 5%	273
March	1st to 10th	Day	15% 17% 42% 20% 5%	330
	11th to 20th	Day	18% 16% 40% 21% 6%	330
	21st to end	Day	18% 17% 43% 18% 3 1	363
April	1st to 10th	Day	15% 23% 34% 23% 5%	330
	11th to 20th	Day	15% 19% 43% 20% 3	608
	21st to end	Day	21% 13% 38% 19% 7% 1	750
May	1st to 10th	Day	17% 11% 37% 27% 7% 2	753
	11th to 20th	Day	16% 10% 33% 25% 14% 3	775
	21st to end	Day	17% 9% 29% 28% 15% 3	844
June	1st to 10th	Day	7% 6% 22% 37% 24% 4	780
	11th to 20th	Day	6% 4 31% 38% 18% 3	780
	21st to end	Day	7% 4 29% 40% 17% 3	780
July	1st to 10th	Day	8% 2 15% 35% 33% 9%	771
	11th to 20th	Day	3 2 10% 45% 31% 8%	768
	21st to end	Day	6% 2 12% 39% 33% 8%	849
August	1st to 10th	Day	6% 2 17% 41% 28% 5%	776
	11th to 20th	Day	7% 2 14% 40% 31% 6%	765
	21st to end	Day	6% 2 13% 36% 33% 9%	728
September	1st to 10th	Day	8% 2 11% 35% 37% 8%	360
	11th to 20th	Day	6% 3 17% 41% 29% 4	360
	21st to end	Day	11% 6% 21% 37% 19% 7%	360
October	1st to 10th	Day	10% 6% 26% 29% 20% 9%	360
	11th to 20th	Day	11% 9% 39% 29% 12% 1	339
	21st to end	Day	18% 13% 32% 24% 11% 2	363
November	1st to 10th	Day	11% 9% 36% 28% 13% 3	330
	11th to 20th	Day	14% 10% 38% 22% 14% 2	330
	21st to end	Day	16% 13% 32% 29% 9% 1	330
December	1st to 10th	Day	10% 11% 38% 29% 10% 2	330
	11th to 20th	Day	11% 10% 38% 30% 9% 1	330
	21st to end	Day	17% 17% 33% 26% 7%	363
January	1st to 10th	Night	10% 10% 38% 35% 7%	1050
	11th to 20th	Night	11% 12% 37% 34% 7%	1050
	21st to end	Night	13% 11% 36% 34% 5%	1155
February	1st to 10th	Night	14% 11% 40% 30% 4	1015
	11th to 20th	Night	16% 13% 38% 29% 4	824
	21st to end	Night	13% 13% 40% 29% 5%	692
March	1st to 10th	Night	12% 14% 37% 33% 5%	709
	11th to 20th	Night	17% 11% 39% 29% 4	630
	21st to end	Night	17% 14% 40% 25% 5%	693
April	1st to 10th	Night	14% 13% 42% 23% 7%	630
	11th to 20th	Night	18% 15% 42% 21% 4	623
	21st to end	Night	18% 14% 38% 24% 5% 1	630
May	1st to 10th	Night	17% 8% 36% 30% 8% 1	630
	11th to 20th	Night	11% 8% 34% 33% 12% 1	621
	21st to end	Night	13% 8% 31% 32% 14% 2	683
June	1st to 10th	Night	7% 5% 27% 41% 20% 1	630
	11th to 20th	Night	6% 4 36% 41% 12%	630
	21st to end	Night	5% 3 34% 45% 13%	630
July	1st to 10th	Night	5% 2 18% 47% 27% 1	615
	11th to 20th	Night	4 1 18% 50% 26% 2	612
	21st to end	Night	6% 3 13% 48% 29% 2	690
August	1st to 10th	Night	4 1 22% 48% 23% 1	627
	11th to 20th	Night	6% 2 16% 52% 24% 1	624
	21st to end	Night	4 2 13% 45% 32% 3	693
September	1st to 10th	Night	9% 2 19% 48% 22% 1	630
	11th to 20th	Night	9% 2 26% 43% 19% 2	630
	21st to end	Night	9% 5% 26% 40% 19% 1	630
October	1st to 10th	Night	9% 5% 29% 34% 21% 1	651
	11th to 20th	Night	10% 8% 39% 35% 7%	813
	21st to end	Night	14% 11% 33% 31% 10% 1	880
November	1st to 10th	Night	11% 7% 37% 34% 11% 1	983
	11th to 20th	Night	10% 11% 37% 33% 9%	1050
	21st to end	Night	15% 12% 30% 35% 9%	1050
December	1st to 10th	Night	12% 10% 36% 34% 9%	1050
	11th to 20th	Night	14% 10% 36% 35% 5%	1050
	21st to end	Night	14% 12% 33% 35% 5%	1155

Page generated at 2026-10-11 04:06:32. Version ac07

Copyright © 2026 Attilla Danko.