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 2024-11-10.

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	12% 8% 3 7% 5% 4 4 4 5% 7% 41%	101559
	Night	10% 7% 3 7% 5% 4 4 4 5% 7% 44%	97647
Transparency	Day	41% 6% 13% 25% 14% 2	105174
	Night	39% 5% 13% 25% 16% 2	102163
Seeing	Day	16% 8% 31% 29% 14% 3	15956
	Night	14% 8% 34% 34% 10% 1	25828

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	11% 14% 3 15% 10% 8% 7% 3 4 5% 21%	2412
	11th to 20th	Day	6% 15% 5% 11% 5% 6% 9% 3 7% 9% 23%	2705
	21st to end	Day	6% 13% 7% 14% 10% 9% 6% 5% 4 5% 21%	3135
February	1st to 10th	Day	9% 12% 4 12% 6% 7% 7% 5% 5% 6% 27%	1710
	11th to 20th	Day	8% 11% 5% 9% 7% 5% 6% 4 5% 7% 33%	1673
	21st to end	Day	11% 11% 4 9% 5% 6% 4 5% 5% 7% 34%	1570
March	1st to 10th	Day	13% 10% 4 8% 4 3 4 3 4 7% 42%	3330
	11th to 20th	Day	9% 9% 3 7% 4 4 4 3 4 6% 47%	3480
	21st to end	Day	26% 12% 4 9% 5% 4 3 3 4 5% 25%	3814
April	1st to 10th	Day	15% 8% 2 7% 4 4 4 4 6% 7% 38%	2151
	11th to 20th	Day	19% 9% 2 6% 5% 4 4 3 4 6% 37%	2438
	21st to end	Day	21% 8% 2 6% 4 4 4 3 5% 6% 37%	2470
May	1st to 10th	Day	16% 6% 3 7% 5% 4 5% 4 7% 8% 35%	4082
	11th to 20th	Day	13% 6% 2 5% 4 3 3 4 5% 6% 48%	4082
	21st to end	Day	18% 7% 2 6% 4 4 4 4 5% 7% 39%	4824
June	1st to 10th	Day	11% 5% 2 4 3 4 3 3 6% 9% 47%	2735
	11th to 20th	Day	14% 6% 2 6% 5% 4 4 4 6% 7% 43%	2850
	21st to end	Day	9% 4 2 5% 4 4 4 4 6% 9% 48%	2850
July	1st to 10th	Day	10% 5% 2 6% 5% 4 5% 5% 7% 10% 40%	4750
	11th to 20th	Day	6% 3 1 4 3 3 4 3 5% 8% 58%	4350
	21st to end	Day	4 3 2 5% 4 4 4 5% 8% 10% 52%	4465
August	1st to 10th	Day	9% 6% 2 6% 5% 4 6% 4 7% 9% 43%	4104
	11th to 20th	Day	15% 8% 3 7% 4 4 4 4 7% 8% 36%	4041
	21st to end	Day	9% 4 2 6% 4 4 4 3 5% 7% 52%	4532
September	1st to 10th	Day	13% 5% 1 5% 3 3 3 3 5% 6% 53%	2217
	11th to 20th	Day	11% 5% 2 5% 3 3 3 2 4 7% 54%	2090
	21st to end	Day	10% 5% 2 4 4 4 3 3 5% 7% 53%	2090
October	1st to 10th	Day	14% 8% 1 6% 3 3 3 3 5% 6% 47%	1952
	11th to 20th	Day	13% 6% 2 5% 3 3 3 3 4 5% 52%	1900
	21st to end	Day	15% 8% 2 6% 3 3 3 2 5% 5% 46%	2020
November	1st to 10th	Day	11% 7% 3 5% 4 3 4 3 6% 7% 45%	1754
	11th to 20th	Day	9% 8% 4 11% 6% 5% 4 4 4 6% 39%	1561
	21st to end	Day	12% 9% 3 8% 4 4 4 4 5% 7% 40%	1520
December	1st to 10th	Day	7% 10% 3 11% 6% 6% 4 4 6% 6% 36%	1520
	11th to 20th	Day	8% 12% 4 10% 8% 6% 6% 4 5% 7% 29%	1918
	21st to end	Day	17% 9% 5% 16% 6% 4 4 4 5% 7% 23%	2464
January	1st to 10th	Night	10% 12% 4 13% 10% 6% 5% 3 5% 7% 24%	4541
	11th to 20th	Night	5% 10% 4 11% 7% 6% 8% 5% 10% 8% 26%	4248
	21st to end	Night	6% 12% 7% 14% 5% 7% 6% 5% 5% 6% 27%	4532
February	1st to 10th	Night	9% 11% 3 10% 7% 5% 4 4 5% 6% 37%	2470
	11th to 20th	Night	9% 10% 3 8% 5% 4 5% 4 5% 6% 40%	2403
	21st to end	Night	9% 8% 4 8% 5% 4 4 3 6% 7% 41%	1891
March	1st to 10th	Night	8% 6% 3 6% 4 3 3 3 5% 6% 51%	3526
	11th to 20th	Night	9% 7% 2 6% 4 4 4 4 5% 8% 48%	3480
	21st to end	Night	24% 12% 3 8% 6% 4 4 3 4 6% 26%	3817
April	1st to 10th	Night	14% 8% 3 6% 5% 4 4 4 6% 7% 39%	2028
	11th to 20th	Night	16% 9% 3 6% 3 3 4 2 4 6% 43%	1689
	21st to end	Night	16% 9% 3 6% 3 4 4 4 5% 6% 41%	1710
May	1st to 10th	Night	18% 5% 2 4 4 3 3 3 5% 7% 46%	2823
	11th to 20th	Night	9% 5% 3 5% 3 4 4 4 6% 7% 50%	2807
	21st to end	Night	15% 6% 2 6% 4 4 4 4 6% 7% 44%	2743
June	1st to 10th	Night	8% 4 2 4 3 3 4 4 6% 8% 55%	1440
	11th to 20th	Night	8% 5% 1 4 4 4 4 4 6% 9% 51%	1330
	21st to end	Night	7% 3 2 4 4 2 4 4 4 8% 58%	1330
July	1st to 10th	Night	8% 5% 2 6% 3 3 4 4 6% 9% 50%	2220
	11th to 20th	Night	5% 2 1 3 3 3 3 4 5% 6% 66%	2612
	21st to end	Night	3 3 1 4 3 3 4 3 7% 11% 58%	3098
August	1st to 10th	Night	7% 5% 2 5% 4 4 6% 4 6% 8% 48%	2836
	11th to 20th	Night	11% 4 2 5% 3 4 4 4 5% 8% 50%	2798
	21st to end	Night	8% 4 2 5% 3 3 4 3 5% 8% 55%	3135
September	1st to 10th	Night	8% 4 2 4 2 3 3 3 4 7% 59%	1958
	11th to 20th	Night	8% 4 2 4 3 3 4 3 6% 6% 57%	2090
	21st to end	Night	9% 5% 2 4 3 2 3 3 5% 6% 58%	2090
October	1st to 10th	Night	15% 5% 1 4 2 2 3 3 4 7% 53%	2209
	11th to 20th	Night	13% 6% 2 4 3 3 3 3 4 5% 53%	2280
	21st to end	Night	14% 8% 2 5% 3 3 3 3 4 6% 48%	2574
November	1st to 10th	Night	10% 5% 2 5% 5% 4 4 3 5% 6% 51%	2529
	11th to 20th	Night	9% 7% 3 8% 5% 4 4 4 6% 6% 45%	2617
	21st to end	Night	9% 8% 3 6% 4 4 3 3 5% 7% 47%	2660
December	1st to 10th	Night	8% 9% 4 9% 6% 4 5% 4 6% 7% 38%	2660
	11th to 20th	Night	10% 10% 3 7% 6% 5% 5% 4 5% 8% 37%	3279
	21st to end	Night	17% 11% 4 14% 5% 4 4 3 5% 5% 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	64% 7% 10% 13% 6%	2413
	11th to 20th	Day	56% 4 9% 24% 7%	2705
	21st to end	Day	64% 6% 12% 13% 5%	3135
February	1st to 10th	Day	57% 6% 12% 16% 9% 1	1710
	11th to 20th	Day	51% 6% 12% 21% 9% 2	1682
	21st to end	Day	49% 6% 12% 20% 11% 1	1570
March	1st to 10th	Day	43% 5% 11% 30% 10% 1	3330
	11th to 20th	Day	38% 5% 9% 31% 14% 3	3480
	21st to end	Day	62% 6% 13% 14% 4 1	3814
April	1st to 10th	Day	45% 4 14% 23% 12% 1	2151
	11th to 20th	Day	48% 5% 10% 22% 12% 2	2438
	21st to end	Day	48% 6% 11% 24% 11%	2470
May	1st to 10th	Day	43% 7% 12% 23% 15%	4120
	11th to 20th	Day	36% 6% 11% 29% 16% 3	4086
	21st to end	Day	43% 6% 10% 23% 16% 1	4837
June	1st to 10th	Day	34% 7% 15% 28% 14% 2	2735
	11th to 20th	Day	39% 6% 13% 24% 15% 3	2850
	21st to end	Day	32% 6% 16% 30% 14% 3	2850
July	1st to 10th	Day	37% 7% 19% 24% 12% 1	4676
	11th to 20th	Day	24% 5% 14% 34% 20% 3	4274
	21st to end	Day	24% 7% 19% 28% 21% 2	4325
August	1st to 10th	Day	35% 7% 14% 28% 14% 2	4090
	11th to 20th	Day	45% 7% 14% 25% 9% 1	4080
	21st to end	Day	32% 5% 16% 27% 16% 3	4531
September	1st to 10th	Day	34% 4 11% 31% 19% 2	2217
	11th to 20th	Day	31% 6% 15% 32% 15% 1	2090
	21st to end	Day	31% 5% 11% 31% 21% 2	2090
October	1st to 10th	Day	26% 3 8% 29% 31% 4	3238
	11th to 20th	Day	31% 3 14% 26% 22% 4	3140
	21st to end	Day	39% 3 13% 24% 18% 2	3313
November	1st to 10th	Day	38% 4 15% 25% 14% 3	1754
	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	59% 5% 9% 18% 8%	4541
	11th to 20th	Night	51% 5% 13% 20% 9% 1	4248
	21st to end	Night	56% 7% 12% 14% 9% 1	4532
February	1st to 10th	Night	48% 5% 11% 24% 11% 1	2470
	11th to 20th	Night	44% 5% 11% 24% 13% 3	2404
	21st to end	Night	42% 5% 13% 24% 13% 3	1891
March	1st to 10th	Night	34% 5% 12% 29% 19% 2	3526
	11th to 20th	Night	35% 6% 9% 31% 17% 3	3480
	21st to end	Night	60% 6% 13% 15% 5% 1	3817
April	1st to 10th	Night	43% 6% 13% 23% 14% 1	2028
	11th to 20th	Night	44% 3 10% 22% 18% 2	1689
	21st to end	Night	43% 5% 12% 23% 14% 2	1710
May	1st to 10th	Night	38% 6% 13% 22% 19% 2	2850
	11th to 20th	Night	31% 6% 11% 28% 20% 4	2808
	21st to end	Night	39% 6% 11% 27% 16% 1	2751
June	1st to 10th	Night	26% 7% 16% 28% 19% 4	1440
	11th to 20th	Night	29% 5% 16% 26% 20% 4	1330
	21st to end	Night	24% 6% 16% 30% 22% 2	1330
July	1st to 10th	Night	31% 6% 21% 28% 13% 2	2185
	11th to 20th	Night	18% 5% 14% 38% 21% 4	2565
	21st to end	Night	20% 7% 17% 31% 21% 3	2999
August	1st to 10th	Night	33% 7% 13% 29% 16% 3	2826
	11th to 20th	Night	32% 7% 17% 29% 13% 1	2825
	21st to end	Night	28% 5% 17% 26% 21% 3	3135
September	1st to 10th	Night	26% 4 14% 29% 23% 4	1958
	11th to 20th	Night	27% 5% 13% 35% 18% 2	2090
	21st to end	Night	26% 5% 10% 33% 23% 2	2090
October	1st to 10th	Night	21% 2 7% 25% 42% 4	3690
	11th to 20th	Night	26% 3 13% 30% 25% 3	3779
	21st to end	Night	39% 4 11% 30% 15% 1	4235
November	1st to 10th	Night	34% 4 14% 24% 20% 4	2529
	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% 8% 33% 26% 11% 3	270
	11th to 20th	Day	19% 8% 35% 30% 6% 1	270
	21st to end	Day	16% 9% 34% 26% 13% 1	297
February	1st to 10th	Day	12% 15% 38% 30% 4	270
	11th to 20th	Day	11% 11% 46% 22% 7% 1	270
	21st to end	Day	19% 11% 44% 23% 3	225
March	1st to 10th	Day	23% 11% 40% 20% 5% 1	270
	11th to 20th	Day	21% 9% 37% 23% 10% 1	270
	21st to end	Day	31% 9% 34% 18% 6% 2	297
April	1st to 10th	Day	26% 15% 36% 18% 5%	331
	11th to 20th	Day	27% 12% 32% 23% 5% 1	636
	21st to end	Day	26% 10% 30% 21% 11% 2	650
May	1st to 10th	Day	21% 11% 30% 29% 8% 1	653
	11th to 20th	Day	20% 9% 30% 26% 13% 3	675
	21st to end	Day	19% 8% 28% 30% 13% 2	734
June	1st to 10th	Day	10% 7% 24% 33% 22% 5%	680
	11th to 20th	Day	13% 8% 35% 28% 12% 4	680
	21st to end	Day	12% 6% 33% 31% 16% 2	680
July	1st to 10th	Day	7% 4 21% 37% 26% 5%	671
	11th to 20th	Day	7% 4 31% 34% 19% 6%	668
	21st to end	Day	6% 3 23% 40% 24% 4	739
August	1st to 10th	Day	10% 4 22% 36% 23% 4	676
	11th to 20th	Day	12% 3 24% 35% 22% 4	665
	21st to end	Day	9% 4 28% 33% 22% 4	748
September	1st to 10th	Day	15% 5% 25% 35% 16% 4	427
	11th to 20th	Day	9% 5% 33% 34% 15% 4	300
	21st to end	Day	15% 11% 33% 25% 13% 4	300
October	1st to 10th	Day	19% 8% 28% 25% 13% 7%	300
	11th to 20th	Day	14% 15% 37% 23% 10% 1	300
	21st to end	Day	22% 16% 36% 21% 5% 1	330
November	1st to 10th	Day	22% 10% 33% 24% 9% 3	297
	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% 10% 36% 33% 6% 2	950
	21st to end	Night	16% 11% 35% 29% 9%	1045
February	1st to 10th	Night	14% 8% 41% 30% 6% 1	950
	11th to 20th	Night	13% 8% 41% 30% 7% 1	929
	21st to end	Night	14% 7% 38% 31% 9% 1	635
March	1st to 10th	Night	14% 8% 40% 30% 7%	643
	11th to 20th	Night	15% 10% 37% 33% 5%	570
	21st to end	Night	20% 8% 35% 27% 8% 1	627
April	1st to 10th	Night	19% 12% 39% 27% 4	570
	11th to 20th	Night	22% 13% 31% 28% 6% 1	563
	21st to end	Night	20% 11% 34% 27% 8% 1	570
May	1st to 10th	Night	18% 7% 35% 31% 9%	570
	11th to 20th	Night	18% 7% 31% 34% 10% 1	561
	21st to end	Night	18% 6% 30% 35% 11%	617
June	1st to 10th	Night	9% 6% 25% 42% 18% 1	570
	11th to 20th	Night	11% 4 33% 39% 13% 1	570
	21st to end	Night	9% 3 26% 48% 15%	570
July	1st to 10th	Night	6% 2 21% 43% 26% 1	555
	11th to 20th	Night	5% 1 24% 49% 20%	552
	21st to end	Night	4 2 23% 51% 19%	624
August	1st to 10th	Night	8% 2 22% 46% 21% 1	567
	11th to 20th	Night	9% 2 23% 42% 24% 1	564
	21st to end	Night	7% 3 26% 44% 19% 1	627
September	1st to 10th	Night	10% 3 25% 44% 15% 2	570
	11th to 20th	Night	10% 3 31% 39% 14% 2	570
	21st to end	Night	11% 5% 35% 34% 14% 1	570
October	1st to 10th	Night	17% 7% 34% 29% 12% 1	689
	11th to 20th	Night	16% 11% 36% 31% 6%	760
	21st to end	Night	18% 11% 35% 27% 10%	902
November	1st to 10th	Night	12% 10% 36% 33% 9% 1	973
	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 2024-11-07 05:55:47. Version ac07

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