Good Earth State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Good Earth State Park clear sky chart from 2005-11-06 to 2024-01-13.

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	12% 7% 3 6% 5% 3 5% 5% 5% 7% 41%	74784
	Night	11% 7% 3 6% 5% 3 4 4 5% 7% 45%	74958
Transparency	Day	42% 5% 14% 25% 13% 2	74490
	Night	39% 5% 13% 26% 15% 2	74772
Seeing	Day	16% 8% 30% 29% 14% 3	14754
	Night	14% 7% 33% 34% 10% 1	24783

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	7% 10% 4 10% 8% 6% 9% 5% 5% 7% 29%	1444
	11th to 20th	Day	8% 13% 5% 11% 7% 3 8% 4 5% 7% 28%	1556
	21st to end	Day	9% 13% 6% 12% 10% 5% 6% 7% 5% 6% 21%	1782
February	1st to 10th	Day	9% 10% 5% 10% 8% 6% 7% 6% 5% 6% 27%	1620
	11th to 20th	Day	9% 10% 5% 8% 8% 4 6% 5% 5% 7% 33%	1583
	21st to end	Day	12% 10% 4 8% 6% 4 5% 6% 4 8% 33%	1480
March	1st to 10th	Day	15% 10% 5% 8% 4 2 4 4 4 8% 36%	1909
	11th to 20th	Day	13% 10% 4 8% 6% 3 4 4 5% 7% 36%	1980
	21st to end	Day	19% 12% 4 7% 6% 3 3 5% 5% 6% 30%	2178
April	1st to 10th	Day	16% 8% 3 7% 5% 3 4 5% 5% 7% 37%	2037
	11th to 20th	Day	20% 9% 3 5% 5% 3 4 4 4 7% 36%	2308
	21st to end	Day	21% 8% 2 5% 4 3 4 4 5% 7% 37%	2340
May	1st to 10th	Day	18% 6% 3 7% 6% 3 5% 4 5% 7% 35%	2340
	11th to 20th	Day	16% 8% 3 6% 6% 2 5% 6% 6% 7% 36%	2302
	21st to end	Day	18% 7% 3 5% 5% 3 5% 4 6% 8% 36%	2725
June	1st to 10th	Day	12% 4 3 4 4 3 4 4 6% 10% 47%	2591
	11th to 20th	Day	14% 5% 2 5% 5% 3 4 5% 6% 7% 44%	2700
	21st to end	Day	9% 4 2 4 5% 3 5% 5% 6% 9% 49%	2700
July	1st to 10th	Day	5% 3 2 4 5% 2 5% 6% 6% 10% 53%	2700
	11th to 20th	Day	6% 3 1 4 3 2 4 4 5% 9% 59%	2479
	21st to end	Day	5% 3 1 3 4 2 5% 5% 6% 10% 54%	2546
August	1st to 10th	Day	10% 5% 2 5% 6% 3 6% 6% 7% 9% 42%	2328
	11th to 20th	Day	9% 5% 3 5% 5% 3 4 5% 7% 8% 46%	2301
	21st to end	Day	8% 3 2 4 4 3 4 4 4 7% 57%	2574
September	1st to 10th	Day	14% 5% 2 5% 4 2 3 4 5% 6% 51%	2101
	11th to 20th	Day	11% 5% 2 4 4 2 4 3 4 7% 53%	1980
	21st to end	Day	11% 5% 2 4 5% 2 4 4 5% 7% 52%	1980
October	1st to 10th	Day	15% 7% 2 5% 4 3 3 3 6% 6% 46%	1850
	11th to 20th	Day	14% 6% 2 4 4 2 3 3 4 5% 52%	1800
	21st to end	Day	16% 8% 3 5% 5% 2 2 3 4 5% 46%	1914
November	1st to 10th	Day	10% 7% 3 4 5% 3 4 4 6% 7% 46%	1673
	11th to 20th	Day	9% 7% 4 10% 7% 4 4 5% 4 6% 39%	1561
	21st to end	Day	12% 8% 3 7% 4 3 5% 5% 5% 8% 40%	1520
December	1st to 10th	Day	7% 10% 3 10% 7% 4 5% 5% 6% 6% 36%	1520
	11th to 20th	Day	8% 12% 5% 8% 9% 5% 6% 6% 5% 7% 29%	1918
	21st to end	Day	17% 8% 5% 15% 7% 3 4 5% 5% 7% 24%	2464
January	1st to 10th	Night	8% 6% 3 8% 8% 5% 7% 5% 6% 9% 34%	2719
	11th to 20th	Night	8% 10% 5% 10% 9% 4 5% 5% 5% 7% 31%	2457
	21st to end	Night	10% 12% 5% 9% 6% 4 5% 5% 5% 7% 31%	2574
February	1st to 10th	Night	9% 9% 4 9% 9% 3 5% 5% 5% 6% 37%	2340
	11th to 20th	Night	9% 9% 4 8% 6% 3 5% 5% 5% 6% 40%	2273
	21st to end	Night	9% 8% 4 7% 6% 4 5% 4 6% 7% 40%	1782
March	1st to 10th	Night	11% 8% 4 7% 6% 3 3 4 6% 7% 42%	2050
	11th to 20th	Night	12% 9% 4 8% 6% 3 4 5% 4 6% 40%	1980
	21st to end	Night	16% 9% 4 6% 6% 3 5% 4 4 7% 35%	2178
April	1st to 10th	Night	14% 8% 3 5% 5% 3 4 5% 6% 7% 39%	1922
	11th to 20th	Night	17% 9% 3 5% 4 3 3 4 4 6% 43%	1599
	21st to end	Night	16% 8% 3 5% 4 3 4 5% 5% 7% 41%	1620
May	1st to 10th	Night	15% 5% 2 4 5% 3 4 4 7% 9% 43%	1620
	11th to 20th	Night	14% 7% 3 4 4 3 4 4 5% 7% 46%	1591
	21st to end	Night	14% 7% 3 5% 4 3 5% 5% 7% 8% 40%	1551
June	1st to 10th	Night	8% 4 2 4 3 2 4 5% 5% 9% 54%	1365
	11th to 20th	Night	7% 4 2 4 4 3 4 5% 6% 9% 53%	1260
	21st to end	Night	7% 3 2 4 4 2 3 5% 4 8% 59%	1260
July	1st to 10th	Night	4 3 1 3 3 2 4 5% 6% 9% 59%	1260
	11th to 20th	Night	4 2 2 3 2 4 4 5% 7% 66%	1473
	21st to end	Night	4 3 1 3 3 2 4 5% 6% 9% 60%	1772
August	1st to 10th	Night	6% 4 2 4 4 3 6% 5% 6% 9% 49%	1611
	11th to 20th	Night	8% 3 1 4 3 2 4 5% 4 8% 59%	1600
	21st to end	Night	5% 2 2 4 4 2 3 4 5% 7% 62%	1782
September	1st to 10th	Night	9% 4 2 4 3 2 3 4 5% 7% 58%	1854
	11th to 20th	Night	9% 4 2 4 3 2 4 3 5% 6% 57%	1980
	21st to end	Night	9% 5% 2 4 3 2 3 4 5% 7% 57%	1980
October	1st to 10th	Night	16% 5% 2 4 3 2 4 3 4 7% 51%	2092
	11th to 20th	Night	13% 6% 3 4 3 2 3 4 4 6% 52%	2160
	21st to end	Night	14% 8% 3 5% 4 2 3 3 4 5% 49%	2438
November	1st to 10th	Night	10% 5% 2 4 6% 3 4 4 5% 6% 52%	2405
	11th to 20th	Night	9% 7% 3 7% 6% 3 4 4 6% 7% 45%	2617
	21st to end	Night	9% 7% 3 6% 4 3 3 4 5% 7% 48%	2660
December	1st to 10th	Night	8% 9% 4 8% 7% 3 5% 5% 6% 7% 38%	2660
	11th to 20th	Night	10% 9% 4 7% 7% 3 5% 5% 5% 8% 37%	3279
	21st to end	Night	17% 10% 5% 13% 7% 3 4 4 4 6% 27%	5194

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	55% 5% 15% 15% 8% 1	1445
	11th to 20th	Day	55% 6% 12% 19% 8%	1556
	21st to end	Day	63% 6% 12% 14% 5%	1782
February	1st to 10th	Day	57% 5% 12% 16% 9% 1	1620
	11th to 20th	Day	52% 6% 13% 19% 9% 2	1592
	21st to end	Day	51% 6% 11% 19% 11% 1	1480
March	1st to 10th	Day	49% 5% 15% 23% 8% 1	1909
	11th to 20th	Day	49% 5% 12% 24% 9%	1980
	21st to end	Day	55% 5% 16% 18% 5% 1	2178
April	1st to 10th	Day	46% 5% 14% 23% 11% 1	2037
	11th to 20th	Day	49% 4 10% 22% 11% 2	2308
	21st to end	Day	48% 5% 11% 24% 10%	2340
May	1st to 10th	Day	48% 6% 12% 20% 13%	2340
	11th to 20th	Day	45% 6% 14% 24% 10%	2306
	21st to end	Day	46% 6% 12% 23% 12% 1	2725
June	1st to 10th	Day	34% 7% 16% 27% 14% 2	2591
	11th to 20th	Day	38% 6% 13% 24% 15% 3	2700
	21st to end	Day	31% 6% 16% 30% 14% 3	2700
July	1st to 10th	Day	26% 7% 19% 33% 14% 1	2626
	11th to 20th	Day	23% 5% 14% 30% 22% 6%	2403
	21st to end	Day	24% 6% 17% 32% 19% 3	2405
August	1st to 10th	Day	36% 8% 16% 26% 12% 2	2314
	11th to 20th	Day	34% 7% 14% 31% 13% 1	2301
	21st to end	Day	28% 5% 12% 32% 19% 4	2574
September	1st to 10th	Day	35% 5% 11% 29% 19% 2	2101
	11th to 20th	Day	31% 6% 16% 32% 14% 1	1980
	21st to end	Day	32% 5% 11% 31% 19% 1	1980
October	1st to 10th	Day	40% 4 12% 27% 16% 1	1850
	11th to 20th	Day	35% 3 11% 29% 18% 3	1800
	21st to end	Day	42% 4 12% 24% 17% 2	1914
November	1st to 10th	Day	37% 4 16% 26% 15% 3	1673
	11th to 20th	Day	46% 4 14% 22% 13%	1561
	21st to end	Day	43% 4 15% 24% 13% 1	1520
December	1st to 10th	Day	48% 4 16% 21% 10% 1	1520
	11th to 20th	Day	53% 6% 17% 19% 5%	1915
	21st to end	Day	60% 6% 11% 16% 7% 1	2464
January	1st to 10th	Night	46% 7% 12% 22% 12%	2719
	11th to 20th	Night	52% 5% 15% 20% 7% 1	2457
	21st to end	Night	52% 6% 13% 18% 10% 1	2574
February	1st to 10th	Night	48% 5% 11% 24% 11% 1	2340
	11th to 20th	Night	45% 5% 12% 23% 13% 3	2274
	21st to end	Night	44% 5% 12% 24% 13% 3	1782
March	1st to 10th	Night	41% 6% 17% 26% 8% 2	2050
	11th to 20th	Night	46% 6% 9% 26% 13% 1	1980
	21st to end	Night	50% 6% 14% 21% 8% 2	2178
April	1st to 10th	Night	43% 6% 13% 23% 13% 1	1922
	11th to 20th	Night	44% 3 11% 23% 16% 2	1599
	21st to end	Night	43% 5% 12% 24% 14% 3	1620
May	1st to 10th	Night	38% 6% 15% 26% 13% 2	1620
	11th to 20th	Night	38% 6% 14% 25% 16% 2	1592
	21st to end	Night	40% 6% 15% 23% 14% 2	1552
June	1st to 10th	Night	27% 7% 16% 28% 19% 2	1365
	11th to 20th	Night	27% 5% 17% 26% 20% 4	1260
	21st to end	Night	24% 6% 16% 29% 22% 2	1260
July	1st to 10th	Night	21% 6% 15% 36% 20% 2	1225
	11th to 20th	Night	17% 7% 16% 33% 21% 7%	1426
	21st to end	Night	20% 6% 16% 32% 21% 5%	1673
August	1st to 10th	Night	30% 8% 15% 29% 15% 3	1601
	11th to 20th	Night	24% 6% 15% 36% 17% 2	1600
	21st to end	Night	22% 4 15% 28% 25% 5%	1782
September	1st to 10th	Night	27% 5% 15% 28% 22% 4	1854
	11th to 20th	Night	28% 5% 13% 35% 17% 2	1980
	21st to end	Night	27% 5% 11% 34% 22% 2	1980
October	1st to 10th	Night	35% 4 11% 28% 20% 1	2092
	11th to 20th	Night	35% 4 10% 29% 20% 3	2160
	21st to end	Night	38% 5% 13% 24% 19% 2	2438
November	1st to 10th	Night	33% 4 14% 24% 21% 4	2405
	11th to 20th	Night	38% 5% 14% 26% 16% 1	2617
	21st to end	Night	37% 4 15% 28% 15% 1	2660
December	1st to 10th	Night	45% 5% 16% 25% 9%	2660
	11th to 20th	Night	45% 6% 20% 22% 6%	3281
	21st to end	Night	60% 4 9% 19% 7% 1	5194

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	19% 9% 33% 26% 11% 3	270
	11th to 20th	Day	20% 6% 35% 32% 7% 2	246
	21st to end	Day	17% 11% 36% 26% 9% 1	264
February	1st to 10th	Day	12% 16% 38% 32% 3	240
	11th to 20th	Day	13% 13% 45% 23% 6% 1	240
	21st to end	Day	20% 12% 41% 23% 4 1	198
March	1st to 10th	Day	25% 11% 36% 21% 6% 1	240
	11th to 20th	Day	23% 8% 36% 22% 10% 1	240
	21st to end	Day	31% 10% 32% 19% 7% 2	264
April	1st to 10th	Day	26% 13% 37% 19% 6%	297
	11th to 20th	Day	27% 12% 32% 23% 6% 1	586
	21st to end	Day	26% 11% 29% 22% 11% 2	600
May	1st to 10th	Day	22% 10% 30% 29% 8% 1	603
	11th to 20th	Day	22% 9% 30% 26% 11% 3	625
	21st to end	Day	19% 7% 27% 31% 13% 2	679
June	1st to 10th	Day	10% 7% 22% 34% 23% 5%	630
	11th to 20th	Day	13% 7% 35% 29% 13% 4	630
	21st to end	Day	11% 6% 32% 32% 17% 2	630
July	1st to 10th	Day	6% 4 20% 39% 26% 5%	621
	11th to 20th	Day	7% 4 31% 34% 18% 6%	618
	21st to end	Day	6% 3 24% 39% 25% 3	684
August	1st to 10th	Day	11% 3 20% 37% 24% 4	626
	11th to 20th	Day	11% 3 23% 35% 23% 4	615
	21st to end	Day	9% 4 27% 33% 22% 5%	693
September	1st to 10th	Day	16% 5% 25% 34% 15% 4	391
	11th to 20th	Day	10% 5% 33% 34% 15% 4	270
	21st to end	Day	16% 11% 33% 26% 11% 2	270
October	1st to 10th	Day	20% 8% 27% 26% 13% 6%	270
	11th to 20th	Day	15% 16% 36% 23% 10% 1	270
	21st to end	Day	23% 15% 35% 20% 5% 1	297
November	1st to 10th	Day	20% 10% 34% 25% 8% 3	270
	11th to 20th	Day	15% 14% 43% 20% 7%	270
	21st to end	Day	19% 16% 32% 24% 9% 1	270
December	1st to 10th	Day	11% 11% 41% 25% 10% 2	270
	11th to 20th	Day	20% 7% 38% 27% 7%	270
	21st to end	Day	24% 13% 35% 23% 4 1	297
January	1st to 10th	Night	12% 10% 36% 32% 9% 1	950
	11th to 20th	Night	14% 9% 35% 34% 6% 2	915
	21st to end	Night	16% 11% 36% 29% 7%	990
February	1st to 10th	Night	14% 8% 41% 30% 6% 1	900
	11th to 20th	Night	14% 8% 41% 29% 7% 1	879
	21st to end	Night	15% 8% 38% 30% 9% 1	598
March	1st to 10th	Night	15% 9% 38% 31% 8%	610
	11th to 20th	Night	16% 9% 37% 34% 5%	540
	21st to end	Night	19% 8% 35% 27% 8% 1	594
April	1st to 10th	Night	19% 11% 39% 28% 4	540
	11th to 20th	Night	22% 13% 31% 28% 6% 1	533
	21st to end	Night	19% 11% 34% 27% 8% 1	540
May	1st to 10th	Night	17% 7% 35% 32% 9%	540
	11th to 20th	Night	19% 7% 31% 33% 10% 1	531
	21st to end	Night	18% 6% 30% 35% 12%	584
June	1st to 10th	Night	9% 6% 23% 42% 19% 1	540
	11th to 20th	Night	10% 4 33% 39% 13% 1	540
	21st to end	Night	8% 3 26% 48% 15%	540
July	1st to 10th	Night	6% 2 20% 45% 26% 1	525
	11th to 20th	Night	5% 1 25% 49% 19%	522
	21st to end	Night	5% 2 22% 51% 20%	591
August	1st to 10th	Night	9% 1 21% 47% 21% 1	537
	11th to 20th	Night	9% 1 23% 42% 25% 1	534
	21st to end	Night	6% 3 26% 44% 19% 2	594
September	1st to 10th	Night	10% 3 25% 44% 15% 2	540
	11th to 20th	Night	11% 3 30% 39% 15% 2	540
	21st to end	Night	12% 6% 35% 34% 13% 1	540
October	1st to 10th	Night	18% 7% 34% 28% 12% 1	652
	11th to 20th	Night	16% 11% 35% 32% 6%	720
	21st to end	Night	18% 10% 34% 28% 10%	854
November	1st to 10th	Night	11% 9% 35% 33% 10% 1	925
	11th to 20th	Night	13% 11% 38% 29% 7% 1	950
	21st to end	Night	13% 9% 38% 32% 8%	950
December	1st to 10th	Night	13% 9% 39% 32% 7%	950
	11th to 20th	Night	18% 6% 37% 31% 8%	950
	21st to end	Night	21% 10% 35% 27% 6%	1045

Page generated at 2024-01-10 09:16:10. Version ac07

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