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 2025-04-11.

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%	117192
	Night	2 6% 2 6% 4 3 4 3 5% 6% 59%	119922
Transparency	Day	22% 6% 9% 17% 24% 23%	116934
	Night	23% 6% 10% 18% 25% 18%	119770
Seeing	Day	8% 15% 27% 28% 17% 5%	15463
	Night	6% 9% 24% 33% 22% 6%	25086

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	2 12% 7% 10% 4 4 3 3 5% 6% 43%	3639
	11th to 20th	Day	4 8% 2 5% 4 4 3 3 4 5% 59%	3640
	21st to end	Day	3 7% 4 8% 4 4 5% 4 5% 8% 49%	4262
February	1st to 10th	Day	1 8% 4 7% 4 4 4 4 5% 7% 52%	1995
	11th to 20th	Day	3 7% 4 8% 5% 4 4 5% 5% 8% 48%	1950
	21st to end	Day	1 7% 3 8% 5% 4 4 4 4 7% 53%	1650
March	1st to 10th	Day	2 11% 6% 10% 5% 4 5% 5% 6% 10% 37%	4518
	11th to 20th	Day	2 7% 3 7% 5% 4 4 4 6% 8% 52%	4686
	21st to end	Day	1 11% 5% 9% 5% 5% 4 4 5% 7% 43%	5921
April	1st to 10th	Day	3 8% 4 7% 5% 4 4 3 5% 8% 51%	2400
	11th to 20th	Day	3 7% 2 6% 4 4 4 3 5% 6% 55%	2251
	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	2 3 1 3 3 3 3 2 3 4 72%	3490
	11th to 20th	Day	2 3 1 3 2 2 2 2 4 4 73%	3202
	21st to end	Day	2 4 2 4 3 3 3 3 5% 6% 65%	3143
November	1st to 10th	Day	3 5% 3 5% 3 4 3 3 6% 8% 57%	1764
	11th to 20th	Day	2 5% 2 4 2 3 4 4 6% 8% 61%	1800
	21st to end	Day	2 8% 4 6% 4 4 4 3 5% 6% 55%	1800
December	1st to 10th	Day	2 3 1 3 2 3 3 3 4 7% 70%	2862
	11th to 20th	Day	2 9% 3 8% 5% 5% 4 4 7% 9% 45%	3028
	21st to end	Day	5% 9% 3 9% 4 4 3 4 6% 9% 44%	4004
January	1st to 10th	Night	1 8% 4 10% 6% 5% 3 3 5% 8% 47%	6306
	11th to 20th	Night	3 7% 3 6% 5% 4 4 3 4 5% 56%	6320
	21st to end	Night	2 8% 3 6% 4 4 4 3 5% 7% 53%	6690
February	1st to 10th	Night	3 7% 4 8% 5% 3 4 4 5% 6% 52%	2402
	11th to 20th	Night	1 7% 3 6% 5% 4 5% 4 6% 8% 50%	2338
	21st to end	Night	1 7% 3 6% 4 4 5% 4 6% 8% 52%	1980
March	1st to 10th	Night	1 9% 6% 9% 4 4 3 4 4 6% 49%	5376
	11th to 20th	Night	1 6% 3 8% 5% 4 4 4 6% 8% 50%	5313
	21st to end	Night	2 9% 3 6% 4 4 5% 4 5% 8% 50%	5050
April	1st to 10th	Night	2 7% 3 7% 6% 3 4 4 5% 6% 54%	2000
	11th to 20th	Night	3 7% 2 6% 3 4 4 3 5% 6% 58%	1883
	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	3 3 1 3 2 3 3 3 4 5% 71%	3490
	11th to 20th	Night	2 3 1 3 2 3 3 2 4 4 74%	3732
	21st to end	Night	1 2 1 3 2 3 3 2 4 5% 74%	4414
November	1st to 10th	Night	3 5% 2 4 3 3 3 3 5% 7% 63%	2535
	11th to 20th	Night	2 4 2 3 3 3 4 3 6% 8% 63%	2600
	21st to end	Night	3 6% 3 6% 5% 3 4 4 5% 7% 56%	2600
December	1st to 10th	Night	2 3 2 5% 3 3 3 3 5% 6% 65%	4321
	11th to 20th	Night	2 7% 3 6% 4 4 5% 4 8% 12% 45%	5176
	21st to end	Night	3 9% 4 10% 6% 6% 6% 5% 8% 8% 35%	6952

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	29% 14% 21% 16% 18% 3	3639
	11th to 20th	Day	22% 10% 9% 17% 25% 17%	3640
	21st to end	Day	29% 9% 12% 17% 23% 10%	4262
February	1st to 10th	Day	29% 7% 11% 23% 19% 11%	1995
	11th to 20th	Day	31% 7% 11% 21% 23% 8%	1960
	21st to end	Day	29% 6% 12% 24% 22% 6%	1650
March	1st to 10th	Day	34% 8% 9% 22% 18% 9%	4518
	11th to 20th	Day	25% 8% 16% 29% 20% 3	4686
	21st to end	Day	32% 11% 13% 20% 19% 6%	5921
April	1st to 10th	Day	31% 7% 10% 24% 20% 9%	2400
	11th to 20th	Day	27% 6% 13% 22% 24% 9%	2254
	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	17% 3 5% 9% 33% 33%	3490
	11th to 20th	Day	15% 3 4 12% 39% 28%	3202
	21st to end	Day	19% 3 6% 19% 40% 13%	3143
November	1st to 10th	Day	22% 6% 11% 23% 24% 14%	1764
	11th to 20th	Day	20% 5% 11% 22% 31% 11%	1800
	21st to end	Day	29% 6% 8% 22% 22% 12%	1800
December	1st to 10th	Day	16% 4 9% 20% 32% 19%	2862
	11th to 20th	Day	34% 5% 13% 19% 22% 7%	3028
	21st to end	Day	34% 8% 16% 23% 17% 3	4004
January	1st to 10th	Night	25% 13% 17% 20% 21% 3	6306
	11th to 20th	Night	25% 8% 11% 16% 28% 13%	6320
	21st to end	Night	29% 7% 10% 15% 26% 13%	6690
February	1st to 10th	Night	31% 7% 11% 23% 20% 9%	2402
	11th to 20th	Night	28% 7% 12% 20% 26% 8%	2339
	21st to end	Night	26% 7% 14% 23% 22% 8%	1980
March	1st to 10th	Night	32% 7% 8% 20% 20% 14%	5376
	11th to 20th	Night	25% 10% 14% 30% 18% 4	5313
	21st to end	Night	26% 10% 17% 25% 17% 3	5050
April	1st to 10th	Night	29% 7% 12% 23% 21% 7%	2000
	11th to 20th	Night	26% 6% 11% 27% 20% 10%	1883
	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	17% 3 6% 10% 32% 32%	3490
	11th to 20th	Night	15% 2 6% 14% 35% 29%	3732
	21st to end	Night	14% 3 5% 18% 47% 13%	4414
November	1st to 10th	Night	20% 5% 11% 25% 25% 14%	2535
	11th to 20th	Night	19% 5% 12% 23% 30% 11%	2600
	21st to end	Night	27% 6% 10% 21% 25% 12%	2600
December	1st to 10th	Night	20% 5% 8% 19% 27% 21%	4321
	11th to 20th	Night	30% 7% 15% 19% 23% 6%	5176
	21st to end	Night	41% 9% 12% 19% 14% 5%	6952

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	15% 26% 27% 19% 11% 3	200
	11th to 20th	Day	8% 23% 30% 17% 14% 9%	200
	21st to end	Day	9% 12% 27% 24% 21% 7%	335
February	1st to 10th	Day	10% 24% 31% 18% 13% 4	497
	11th to 20th	Day	10% 19% 31% 25% 12% 3	495
	21st to end	Day	8% 17% 34% 31% 7% 2	414
March	1st to 10th	Day	11% 21% 33% 22% 11% 2	500
	11th to 20th	Day	11% 18% 29% 23% 15% 4	500
	21st to end	Day	12% 23% 31% 25% 8% 2	550
April	1st to 10th	Day	10% 18% 30% 25% 15% 3	500
	11th to 20th	Day	11% 20% 34% 21% 10% 4	453
	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% 29% 21% 4	360
November	1st to 10th	Day	6% 16% 30% 25% 19% 4	300
	11th to 20th	Day	9% 13% 32% 21% 17% 8%	300
	21st to end	Day	12% 16% 21% 26% 22% 4	300
December	1st to 10th	Day	5% 16% 26% 27% 19% 7%	275
	11th to 20th	Day	10% 22% 23% 23% 18% 6%	200
	21st to end	Day	14% 22% 27% 21% 11% 4	220
January	1st to 10th	Night	8% 13% 29% 25% 17% 9%	800
	11th to 20th	Night	4 14% 26% 31% 19% 7%	800
	21st to end	Night	8% 10% 27% 30% 18% 7%	880
February	1st to 10th	Night	8% 14% 29% 27% 18% 5%	800
	11th to 20th	Night	6% 13% 28% 32% 17% 5%	784
	21st to end	Night	5% 11% 33% 33% 15% 3	660
March	1st to 10th	Night	6% 13% 32% 32% 14% 4	800
	11th to 20th	Night	6% 12% 26% 29% 20% 7%	800
	21st to end	Night	10% 13% 30% 30% 15% 2	880
April	1st to 10th	Night	6% 12% 30% 34% 15% 3	800
	11th to 20th	Night	8% 15% 25% 32% 15% 5%	753
	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 9% 22% 30% 24% 11%	836
November	1st to 10th	Night	6% 8% 22% 31% 24% 9%	780
	11th to 20th	Night	5% 8% 27% 33% 20% 6%	800
	21st to end	Night	6% 11% 25% 29% 24% 6%	800
December	1st to 10th	Night	6% 12% 23% 34% 19% 7%	800
	11th to 20th	Night	10% 10% 25% 31% 19% 4	800
	21st to end	Night	9% 14% 31% 29% 15% 2	880

Page generated at 2025-04-08 06:17:27. Version ac07

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