Berlin-Ichthyosaur State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Berlin-Ichthyosaur State Park clear sky chart from 2005-11-06 to 2024-10-25.

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	3 6% 2 5% 3 3 3 3 5% 6% 60%	100964
	Night	3 6% 3 6% 4 4 4 3 5% 6% 57%	98017
Transparency	Day	22% 6% 9% 17% 23% 23%	100706
	Night	24% 7% 10% 18% 23% 18%	97865
Seeing	Day	8% 14% 27% 29% 17% 5%	14940
	Night	6% 9% 23% 33% 23% 6%	24416

By Month

Percentage Cloud Cover SW (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	3 14% 8% 13% 5% 4 4 3 5% 6% 36%	2539
	11th to 20th	Day	5% 11% 3 7% 6% 5% 5% 4 5% 7% 42%	2540
	21st to end	Day	4 9% 5% 9% 4 4 5% 5% 6% 9% 40%	2968
February	1st to 10th	Day	1 9% 4 7% 4 4 4 4 5% 7% 51%	1895
	11th to 20th	Day	3 7% 4 8% 5% 4 4 4 5% 8% 48%	1850
	21st to end	Day	1 7% 3 8% 5% 4 4 4 4 7% 52%	1570
March	1st to 10th	Day	1 10% 4 9% 6% 4 5% 5% 6% 9% 40%	3138
	11th to 20th	Day	2 6% 3 7% 4 3 4 3 5% 6% 58%	3267
	21st to end	Day	2 13% 7% 11% 6% 5% 5% 4 6% 7% 35%	4130
April	1st to 10th	Day	3 8% 4 7% 5% 4 4 3 5% 8% 51%	2280
	11th to 20th	Day	3 7% 2 6% 4 4 4 3 5% 6% 55%	2249
	21st to end	Day	5% 10% 2 5% 3 3 4 3 5% 6% 55%	2340
May	1st to 10th	Day	3 5% 2 4 2 3 3 3 5% 6% 66%	4110
	11th to 20th	Day	3 5% 2 4 3 3 3 3 4 6% 63%	4071
	21st to end	Day	4 7% 2 5% 3 3 3 3 4 5% 61%	4691
June	1st to 10th	Day	4 5% 2 5% 4 4 4 3 5% 7% 56%	2660
	11th to 20th	Day	2 3 1 3 3 2 3 3 5% 6% 69%	2660
	21st to end	Day	2 3 1 3 3 2 3 2 4 5% 72%	2660
July	1st to 10th	Day	1 2 1 3 2 2 2 2 3 3 80%	4420
	11th to 20th	Day	3 2 1 3 3 4 5% 4 6% 7% 62%	4420
	21st to end	Day	3 3 2 4 4 4 4 3 5% 5% 63%	4767
August	1st to 10th	Day	3 2 1 3 2 2 3 2 4 5% 74%	3976
	11th to 20th	Day	1 1 2 2 2 3 2 3 4 80%	3724
	21st to end	Day	2 2 1 2 1 2 2 2 3 4 79%	4180
September	1st to 10th	Day	2 2 1 2 2 3 4 3 4 5% 72%	2280
	11th to 20th	Day	3 3 2 3 3 3 2 2 4 5% 72%	2138
	21st to end	Day	2 3 1 3 2 2 2 2 4 4 74%	2090
October	1st to 10th	Day	4 4 2 4 3 3 3 2 4 4 68%	2090
	11th to 20th	Day	2 4 2 4 2 2 2 3 4 5% 69%	1929
	21st to end	Day	3 3 1 4 2 3 3 3 4 6% 68%	1852
November	1st to 10th	Day	3 5% 3 5% 3 4 3 3 6% 8% 56%	1674
	11th to 20th	Day	2 5% 2 4 2 3 4 4 6% 8% 61%	1710
	21st to end	Day	2 8% 4 6% 4 4 4 3 5% 6% 54%	1710
December	1st to 10th	Day	3 5% 2 5% 3 3 4 4 6% 8% 58%	1664
	11th to 20th	Day	3 10% 4 10% 6% 5% 4 5% 6% 7% 38%	1928
	21st to end	Day	3 9% 3 10% 4 5% 4 5% 7% 9% 41%	2794
January	1st to 10th	Night	2 9% 5% 12% 7% 5% 4 3 5% 7% 42%	4406
	11th to 20th	Night	5% 10% 4 9% 7% 5% 5% 4 6% 7% 41%	4420
	21st to end	Night	3 10% 4 8% 5% 5% 6% 4 6% 8% 42%	4678
February	1st to 10th	Night	2 7% 4 8% 5% 3 4 4 5% 6% 52%	2282
	11th to 20th	Night	2 7% 3 6% 5% 4 5% 4 6% 8% 51%	2218
	21st to end	Night	1 7% 3 6% 4 4 5% 4 6% 8% 51%	1884
March	1st to 10th	Night	1 8% 6% 8% 5% 5% 4 4 5% 7% 47%	3736
	11th to 20th	Night	2 6% 3 8% 5% 5% 4 3 5% 7% 52%	3712
	21st to end	Night	3 12% 4 8% 5% 4 5% 4 5% 7% 44%	3519
April	1st to 10th	Night	2 8% 3 6% 6% 3 4 4 5% 6% 53%	1900
	11th to 20th	Night	3 7% 2 6% 3 4 4 3 5% 6% 58%	1879
	21st to end	Night	5% 9% 3 4 2 3 3 2 5% 5% 58%	1838
May	1st to 10th	Night	3 6% 3 5% 3 3 3 2 4 5% 64%	2860
	11th to 20th	Night	4 5% 1 4 2 2 3 2 4 5% 67%	2834
	21st to end	Night	4 5% 2 4 3 4 3 3 4 5% 63%	2870
June	1st to 10th	Night	3 4 1 4 5% 4 5% 4 5% 7% 59%	1520
	11th to 20th	Night	3 2 1 4 3 2 3 3 6% 5% 69%	1520
	21st to end	Night	2 3 1 3 3 3 3 2 4 5% 71%	1520
July	1st to 10th	Night	2 1 1 2 3 2 4 2 4 4 75%	2540
	11th to 20th	Night	3 4 2 5% 4 5% 6% 5% 6% 6% 54%	2540
	21st to end	Night	3 4 1 4 4 4 5% 4 5% 6% 59%	2782
August	1st to 10th	Night	4 3 1 4 3 3 3 3 5% 6% 63%	2964
	11th to 20th	Night	1 2 1 3 2 2 2 2 4 3 77%	3126
	21st to end	Night	3 2 1 2 2 2 2 2 2 4 78%	3498
September	1st to 10th	Night	2 2 1 2 3 3 2 3 4 5% 73%	1900
	11th to 20th	Night	3 3 1 3 3 2 3 3 4 6% 70%	2042
	21st to end	Night	3 3 1 2 2 1 2 1 3 4 78%	2090
October	1st to 10th	Night	5% 3 1 3 2 3 3 2 4 4 69%	2090
	11th to 20th	Night	2 3 1 3 2 2 3 2 4 5% 72%	2247
	21st to end	Night	2 3 1 3 1 2 3 3 4 5% 73%	2607
November	1st to 10th	Night	3 5% 2 4 3 3 3 3 5% 7% 63%	2405
	11th to 20th	Night	3 4 2 3 3 3 4 3 6% 8% 63%	2470
	21st to end	Night	3 6% 3 6% 5% 3 4 4 5% 7% 55%	2470
December	1st to 10th	Night	3 6% 3 7% 4 4 4 4 5% 7% 54%	2512
	11th to 20th	Night	3 9% 3 7% 5% 5% 5% 4 7% 11% 40%	3276
	21st to end	Night	3 9% 4 10% 7% 6% 6% 6% 8% 7% 34%	4862

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% 18% 18% 19% 12% 1	2539
	11th to 20th	Day	31% 14% 14% 23% 11% 7%	2540
	21st to end	Day	33% 12% 16% 22% 14% 3	2968
February	1st to 10th	Day	29% 7% 12% 24% 18% 9%	1895
	11th to 20th	Day	31% 7% 11% 20% 23% 8%	1860
	21st to end	Day	30% 6% 12% 25% 23% 4	1570
March	1st to 10th	Day	29% 11% 11% 28% 13% 9%	3138
	11th to 20th	Day	21% 9% 16% 32% 17% 4	3267
	21st to end	Day	35% 15% 15% 18% 14% 3	4130
April	1st to 10th	Day	31% 7% 10% 24% 19% 8%	2280
	11th to 20th	Day	27% 6% 13% 22% 24% 9%	2252
	21st to end	Day	28% 6% 9% 27% 24% 6%	2340
May	1st to 10th	Day	16% 6% 8% 27% 31% 11%	4110
	11th to 20th	Day	19% 6% 8% 19% 35% 13%	4074
	21st to end	Day	23% 5% 7% 19% 38% 8%	4691
June	1st to 10th	Day	24% 6% 9% 17% 28% 16%	2660
	11th to 20th	Day	16% 4 5% 14% 32% 29%	2660
	21st to end	Day	14% 4 5% 10% 24% 43%	2660
July	1st to 10th	Day	11% 2 3 6% 10% 68%	4351
	11th to 20th	Day	18% 3 7% 7% 15% 49%	4345
	21st to end	Day	21% 5% 5% 10% 17% 43%	4616
August	1st to 10th	Day	14% 2 3 9% 26% 45%	3962
	11th to 20th	Day	10% 2 4 6% 13% 66%	3760
	21st to end	Day	11% 1 4 5% 28% 51%	4179
September	1st to 10th	Day	14% 5% 5% 9% 25% 43%	2280
	11th to 20th	Day	16% 4 6% 14% 29% 32%	2138
	21st to end	Day	14% 3 4 13% 32% 34%	2090
October	1st to 10th	Day	21% 4 6% 14% 32% 24%	2090
	11th to 20th	Day	16% 4 5% 18% 33% 24%	1929
	21st to end	Day	16% 4 6% 21% 38% 15%	1852
November	1st to 10th	Day	22% 7% 11% 23% 23% 14%	1674
	11th to 20th	Day	19% 6% 12% 21% 31% 11%	1710
	21st to end	Day	30% 6% 8% 22% 23% 12%	1710
December	1st to 10th	Day	23% 7% 15% 23% 24% 9%	1664
	11th to 20th	Day	41% 7% 10% 20% 16% 5%	1928
	21st to end	Day	35% 9% 16% 19% 17% 4	2794
January	1st to 10th	Night	29% 18% 14% 21% 16% 2	4406
	11th to 20th	Night	34% 12% 15% 18% 15% 7%	4420
	21st to end	Night	36% 10% 13% 20% 16% 4	4678
February	1st to 10th	Night	31% 7% 11% 24% 21% 7%	2282
	11th to 20th	Night	27% 7% 13% 19% 26% 8%	2219
	21st to end	Night	27% 7% 14% 23% 22% 6%	1884
March	1st to 10th	Night	30% 9% 11% 23% 17% 11%	3736
	11th to 20th	Night	22% 12% 17% 27% 17% 5%	3712
	21st to end	Night	29% 13% 18% 22% 15% 2	3519
April	1st to 10th	Night	30% 8% 12% 23% 20% 7%	1900
	11th to 20th	Night	26% 6% 11% 27% 20% 10%	1879
	21st to end	Night	26% 6% 10% 29% 23% 5%	1838
May	1st to 10th	Night	16% 9% 10% 25% 31% 9%	2860
	11th to 20th	Night	18% 5% 7% 19% 39% 12%	2835
	21st to end	Night	21% 7% 9% 22% 35% 7%	2870
June	1st to 10th	Night	21% 7% 11% 20% 28% 14%	1520
	11th to 20th	Night	17% 4 7% 16% 36% 21%	1520
	21st to end	Night	14% 4 6% 13% 26% 37%	1520
July	1st to 10th	Night	13% 3 4 6% 12% 62%	2500
	11th to 20th	Night	26% 5% 6% 8% 15% 41%	2492
	21st to end	Night	22% 5% 6% 12% 13% 41%	2695
August	1st to 10th	Night	21% 3 4 11% 24% 38%	2955
	11th to 20th	Night	11% 3 4 6% 15% 60%	3156
	21st to end	Night	13% 1 4 7% 26% 49%	3498
September	1st to 10th	Night	13% 4 5% 9% 26% 43%	1900
	11th to 20th	Night	16% 4 7% 15% 27% 31%	2042
	21st to end	Night	13% 2 4 12% 34% 34%	2090
October	1st to 10th	Night	20% 4 7% 16% 30% 24%	2090
	11th to 20th	Night	15% 3 6% 19% 33% 24%	2247
	21st to end	Night	13% 4 7% 23% 39% 14%	2607
November	1st to 10th	Night	20% 5% 10% 25% 25% 14%	2405
	11th to 20th	Night	19% 5% 12% 22% 31% 12%	2470
	21st to end	Night	27% 6% 10% 20% 26% 11%	2470
December	1st to 10th	Night	28% 7% 13% 19% 24% 8%	2512
	11th to 20th	Night	35% 9% 12% 19% 17% 8%	3276
	21st to end	Night	41% 11% 10% 16% 16% 6%	4862

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% 26% 27% 20% 11% 3	180
	11th to 20th	Day	8% 22% 29% 18% 15% 9%	180
	21st to end	Day	8% 10% 27% 25% 22% 8%	307
February	1st to 10th	Day	6% 24% 32% 19% 14% 5%	457
	11th to 20th	Day	8% 18% 30% 27% 13% 3	455
	21st to end	Day	9% 18% 34% 30% 8% 2	382
March	1st to 10th	Day	10% 20% 33% 23% 12% 2	460
	11th to 20th	Day	9% 18% 28% 24% 17% 4	460
	21st to end	Day	12% 23% 32% 25% 8% 1	506
April	1st to 10th	Day	10% 18% 29% 24% 15% 3	460
	11th to 20th	Day	11% 20% 33% 21% 10% 4	452
	21st to end	Day	13% 15% 29% 24% 13% 6%	460
May	1st to 10th	Day	11% 19% 33% 23% 10% 3	463
	11th to 20th	Day	12% 16% 27% 28% 11% 7%	488
	21st to end	Day	12% 15% 23% 25% 21% 5%	529
June	1st to 10th	Day	6% 17% 25% 29% 17% 7%	490
	11th to 20th	Day	9% 17% 28% 27% 15% 3	490
	21st to end	Day	3 13% 25% 34% 21% 4	490
July	1st to 10th	Day	3 6% 27% 40% 19% 6%	486
	11th to 20th	Day	4 7% 19% 41% 20% 8%	484
	21st to end	Day	6% 6% 19% 39% 21% 10%	531
August	1st to 10th	Day	7% 7% 27% 32% 20% 9%	487
	11th to 20th	Day	3 9% 27% 33% 19% 9%	477
	21st to end	Day	4 6% 26% 35% 21% 9%	539
September	1st to 10th	Day	3 9% 23% 35% 21% 10%	490
	11th to 20th	Day	6% 13% 25% 31% 20% 6%	490
	21st to end	Day	5% 10% 27% 33% 20% 4	490
October	1st to 10th	Day	6% 14% 26% 28% 19% 7%	490
	11th to 20th	Day	5% 16% 24% 31% 19% 4	490
	21st to end	Day	9% 13% 23% 30% 22% 4	341
November	1st to 10th	Day	6% 16% 28% 26% 20% 4	270
	11th to 20th	Day	7% 10% 33% 22% 19% 9%	270
	21st to end	Day	10% 16% 21% 27% 21% 4	270
December	1st to 10th	Day	6% 17% 28% 28% 18% 4	248
	11th to 20th	Day	8% 22% 22% 23% 19% 6%	180
	21st to end	Day	11% 24% 25% 23% 13% 5%	198
January	1st to 10th	Night	8% 12% 27% 26% 18% 9%	760
	11th to 20th	Night	4 13% 25% 31% 19% 7%	760
	21st to end	Night	9% 10% 25% 30% 18% 8%	836
February	1st to 10th	Night	6% 13% 29% 28% 19% 5%	760
	11th to 20th	Night	6% 13% 26% 33% 18% 5%	744
	21st to end	Night	6% 11% 33% 32% 15% 3	628
March	1st to 10th	Night	6% 14% 31% 32% 14% 4	760
	11th to 20th	Night	6% 11% 25% 31% 21% 8%	760
	21st to end	Night	10% 13% 30% 30% 14% 2	836
April	1st to 10th	Night	7% 13% 30% 32% 16% 3	760
	11th to 20th	Night	8% 15% 25% 32% 15% 5%	751
	21st to end	Night	9% 9% 28% 32% 16% 6%	698
May	1st to 10th	Night	6% 13% 31% 34% 14% 2	570
	11th to 20th	Night	10% 8% 25% 34% 20% 4	561
	21st to end	Night	9% 11% 26% 30% 22% 3	481
June	1st to 10th	Night	4 6% 23% 35% 27% 5%	380
	11th to 20th	Night	3 7% 25% 38% 26% 2	380
	21st to end	Night	2 2 18% 49% 26% 3	380
July	1st to 10th	Night	2 1 19% 44% 31% 2	370
	11th to 20th	Night	4 3 15% 39% 35% 4	368
	21st to end	Night	4 2 12% 41% 36% 4	425
August	1st to 10th	Night	6% 3 18% 42% 28% 3	632
	11th to 20th	Night	2 3 16% 39% 32% 8%	752
	21st to end	Night	4 3 14% 39% 35% 6%	836
September	1st to 10th	Night	4 3 12% 35% 38% 8%	760
	11th to 20th	Night	4 4 15% 36% 30% 9%	760
	21st to end	Night	4 4 18% 34% 27% 13%	760
October	1st to 10th	Night	6% 5% 16% 38% 27% 8%	760
	11th to 20th	Night	4 8% 19% 33% 28% 9%	760
	21st to end	Night	4 8% 21% 31% 25% 11%	812
November	1st to 10th	Night	6% 7% 21% 31% 25% 10%	740
	11th to 20th	Night	5% 7% 26% 34% 21% 6%	760
	21st to end	Night	6% 10% 25% 29% 25% 6%	760
December	1st to 10th	Night	6% 13% 23% 34% 18% 6%	760
	11th to 20th	Night	10% 10% 24% 31% 19% 5%	760
	21st to end	Night	9% 14% 29% 30% 15% 2	836

Page generated at 2024-10-22 17:21:04. Version ac07

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