Sky Meadows State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Sky Meadows State Park clear sky chart from 2005-11-06 to 2024-11-04.

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	14% 6% 2 6% 5% 4 5% 4 6% 8% 41%	101161
	Night	14% 7% 2 6% 4 4 4 4 5% 7% 42%	97805
Transparency	Day	39% 6% 12% 24% 16% 3	104804
	Night	39% 6% 12% 24% 17% 3	102301
Seeing	Day	18% 13% 25% 24% 15% 5%	14953
	Night	16% 9% 29% 31% 13% 1	24527

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	17% 5% 1 6% 4 4 5% 3 5% 7% 44%	2688
	11th to 20th	Day	13% 11% 3 8% 5% 4 5% 3 4 5% 39%	2840
	21st to end	Day	16% 10% 3 8% 5% 5% 4 4 5% 6% 35%	3124
February	1st to 10th	Day	13% 9% 2 7% 5% 4 6% 4 6% 6% 38%	1710
	11th to 20th	Day	17% 7% 3 6% 4 4 4 3 6% 7% 39%	1671
	21st to end	Day	16% 9% 3 6% 5% 3 3 4 4 5% 40%	1586
March	1st to 10th	Day	20% 11% 2 7% 5% 4 3 3 4 6% 35%	3435
	11th to 20th	Day	10% 5% 2 6% 4 5% 4 4 5% 7% 48%	3480
	21st to end	Day	19% 7% 2 7% 4 4 4 3 5% 7% 38%	3815
April	1st to 10th	Day	11% 6% 3 8% 5% 5% 5% 3 6% 8% 40%	2278
	11th to 20th	Day	13% 7% 2 6% 5% 4 3 4 5% 6% 46%	2254
	21st to end	Day	17% 7% 2 7% 5% 4 4 4 5% 6% 39%	2297
May	1st to 10th	Day	21% 7% 3 7% 5% 5% 5% 4 6% 9% 29%	4082
	11th to 20th	Day	23% 7% 2 6% 5% 4 4 4 5% 8% 31%	4170
	21st to end	Day	11% 5% 2 5% 4 4 5% 5% 7% 10% 43%	4823
June	1st to 10th	Day	11% 5% 2 5% 4 5% 4 4 7% 10% 42%	2660
	11th to 20th	Day	11% 5% 2 7% 5% 4 6% 5% 8% 10% 39%	2660
	21st to end	Day	9% 3 2 5% 5% 4 5% 6% 6% 10% 44%	2660
July	1st to 10th	Day	6% 4 2 6% 6% 5% 6% 5% 8% 10% 43%	4440
	11th to 20th	Day	9% 5% 2 5% 5% 5% 6% 5% 8% 11% 39%	4163
	21st to end	Day	11% 7% 2 7% 6% 5% 5% 5% 6% 8% 37%	4466
August	1st to 10th	Day	15% 5% 2 6% 6% 6% 6% 5% 7% 10% 33%	4104
	11th to 20th	Day	9% 4 2 6% 5% 5% 6% 5% 8% 9% 41%	3948
	21st to end	Day	10% 4 2 5% 4 4 4 4 6% 7% 48%	4180
September	1st to 10th	Day	14% 7% 2 6% 5% 4 4 3 4 5% 46%	2280
	11th to 20th	Day	13% 6% 2 6% 3 3 4 3 5% 7% 47%	2254
	21st to end	Day	21% 7% 2 6% 5% 3 5% 3 5% 5% 38%	1995
October	1st to 10th	Day	17% 5% 2 6% 3 3 3 3 5% 6% 46%	1900
	11th to 20th	Day	16% 5% 1 5% 4 4 4 3 4 5% 48%	1900
	21st to end	Day	14% 5% 2 5% 3 3 3 3 4 6% 51%	2090
November	1st to 10th	Day	12% 6% 2 3 4 4 3 3 5% 7% 51%	1848
	11th to 20th	Day	15% 6% 2 5% 4 4 3 3 5% 5% 48%	1638
	21st to end	Day	15% 6% 2 4 5% 4 4 4 4 7% 47%	1520
December	1st to 10th	Day	16% 8% 2 6% 4 5% 5% 4 5% 8% 37%	1520
	11th to 20th	Day	16% 5% 2 6% 4 4 4 3 5% 8% 43%	1910
	21st to end	Day	17% 6% 2 6% 5% 4 6% 4 7% 8% 35%	2772
January	1st to 10th	Night	11% 8% 3 6% 5% 4 4 3 5% 7% 45%	4255
	11th to 20th	Night	18% 8% 2 5% 3 3 3 3 4 6% 45%	4120
	21st to end	Night	17% 10% 3 7% 4 3 4 3 4 6% 39%	4532
February	1st to 10th	Night	13% 7% 2 7% 5% 4 5% 4 6% 6% 40%	2470
	11th to 20th	Night	16% 9% 3 6% 4 3 4 4 5% 5% 41%	2394
	21st to end	Night	17% 8% 2 6% 5% 4 4 3 5% 6% 40%	1865
March	1st to 10th	Night	20% 7% 3 6% 5% 4 4 4 5% 6% 37%	3418
	11th to 20th	Night	11% 5% 2 5% 4 4 4 3 5% 7% 49%	3480
	21st to end	Night	14% 8% 2 6% 4 4 3 2 4 5% 47%	3817
April	1st to 10th	Night	14% 8% 2 7% 4 4 5% 4 5% 6% 40%	1900
	11th to 20th	Night	12% 5% 2 7% 5% 4 4 4 6% 8% 44%	1875
	21st to end	Night	16% 5% 2 5% 4 5% 4 4 5% 8% 42%	1899
May	1st to 10th	Night	22% 8% 3 7% 6% 4 4 3 5% 8% 30%	2813
	11th to 20th	Night	24% 10% 3 6% 4 4 3 4 5% 7% 32%	2722
	21st to end	Night	11% 5% 2 6% 4 4 5% 4 7% 10% 43%	2732
June	1st to 10th	Night	10% 5% 2 6% 4 3 6% 5% 7% 9% 43%	1520
	11th to 20th	Night	12% 5% 2 6% 5% 4 5% 4 7% 9% 42%	1520
	21st to end	Night	8% 5% 2 5% 5% 4 5% 4 7% 10% 45%	1520
July	1st to 10th	Night	7% 5% 2 6% 5% 6% 6% 5% 8% 11% 40%	2520
	11th to 20th	Night	7% 5% 2 7% 5% 6% 6% 5% 8% 9% 39%	2792
	21st to end	Night	10% 7% 3 7% 6% 5% 6% 5% 7% 9% 37%	3087
August	1st to 10th	Night	15% 5% 3 7% 5% 5% 6% 4 7% 10% 33%	2825
	11th to 20th	Night	10% 6% 3 7% 4 5% 6% 6% 6% 9% 38%	2847
	21st to end	Night	13% 4 1 5% 3 4 4 3 5% 8% 48%	3476
September	1st to 10th	Night	15% 4 2 5% 4 4 4 4 5% 6% 45%	1900
	11th to 20th	Night	12% 6% 2 5% 4 4 3 3 4 6% 52%	1923
	21st to end	Night	21% 7% 2 7% 4 4 3 3 4 6% 41%	2184
October	1st to 10th	Night	19% 5% 2 5% 3 4 3 2 4 7% 45%	2280
	11th to 20th	Night	14% 4 2 5% 3 4 4 3 4 6% 52%	2280
	21st to end	Night	14% 5% 2 5% 3 3 3 3 5% 6% 50%	2508
November	1st to 10th	Night	11% 6% 2 5% 3 3 3 3 4 6% 53%	2302
	11th to 20th	Night	13% 7% 2 4 3 4 4 3 4 6% 49%	2540
	21st to end	Night	13% 5% 2 5% 4 4 4 3 5% 8% 47%	2660
December	1st to 10th	Night	16% 8% 3 6% 4 4 4 3 5% 6% 41%	2660
	11th to 20th	Night	16% 6% 3 6% 4 4 4 4 5% 6% 43%	3285
	21st to end	Night	15% 6% 3 6% 5% 4 5% 5% 7% 9% 35%	4884

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	40% 4 7% 31% 14% 4	2689
	11th to 20th	Day	47% 4 9% 20% 15% 6%	2840
	21st to end	Day	48% 4 11% 22% 13% 2	3124
February	1st to 10th	Day	44% 6% 13% 23% 12% 3	1710
	11th to 20th	Day	43% 5% 9% 24% 16% 3	1680
	21st to end	Day	46% 5% 11% 19% 15% 4	1586
March	1st to 10th	Day	49% 4 9% 21% 13% 3	3435
	11th to 20th	Day	32% 6% 8% 28% 22% 4	3480
	21st to end	Day	45% 5% 11% 20% 15% 3	3815
April	1st to 10th	Day	39% 6% 12% 19% 18% 5%	2278
	11th to 20th	Day	37% 6% 11% 21% 19% 6%	2254
	21st to end	Day	45% 5% 10% 22% 14% 4	2297
May	1st to 10th	Day	50% 7% 12% 20% 10% 1	4120
	11th to 20th	Day	49% 7% 12% 23% 8% 1	4174
	21st to end	Day	34% 8% 16% 23% 18% 2	4837
June	1st to 10th	Day	36% 7% 15% 25% 16% 1	2660
	11th to 20th	Day	37% 8% 16% 23% 13% 2	2660
	21st to end	Day	32% 9% 16% 25% 16% 2	2660
July	1st to 10th	Day	33% 10% 18% 22% 12% 5%	4370
	11th to 20th	Day	35% 9% 16% 29% 10% 1	4092
	21st to end	Day	43% 7% 10% 23% 16% 1	4324
August	1st to 10th	Day	44% 9% 16% 23% 7%	4091
	11th to 20th	Day	35% 9% 14% 27% 15% 1	3987
	21st to end	Day	33% 6% 16% 28% 16% 2	4180
September	1st to 10th	Day	40% 5% 11% 19% 21% 4	2280
	11th to 20th	Day	35% 5% 9% 27% 20% 3	2254
	21st to end	Day	46% 6% 9% 20% 17% 2	1995
October	1st to 10th	Day	36% 4 8% 19% 27% 6%	3160
	11th to 20th	Day	26% 4 8% 29% 22% 12%	3140
	21st to end	Day	22% 3 11% 30% 27% 7%	3428
November	1st to 10th	Day	33% 4 11% 25% 22% 5%	1848
	11th to 20th	Day	37% 4 11% 22% 22% 5%	1638
	21st to end	Day	37% 5% 10% 28% 18% 2	1520
December	1st to 10th	Day	44% 5% 12% 26% 11% 2	1520
	11th to 20th	Day	40% 3 12% 31% 10% 4	1906
	21st to end	Day	43% 7% 14% 25% 10% 1	2772
January	1st to 10th	Night	36% 4 10% 28% 18% 3	4255
	11th to 20th	Night	41% 4 9% 24% 19% 4	4120
	21st to end	Night	45% 4 10% 26% 14% 1	4532
February	1st to 10th	Night	43% 6% 12% 24% 14% 2	2470
	11th to 20th	Night	44% 3 10% 23% 16% 5%	2396
	21st to end	Night	45% 4 11% 22% 14% 5%	1865
March	1st to 10th	Night	46% 6% 9% 26% 11% 2	3418
	11th to 20th	Night	33% 5% 9% 27% 23% 3	3480
	21st to end	Night	38% 5% 10% 24% 19% 4	3817
April	1st to 10th	Night	42% 5% 10% 21% 19% 4	1900
	11th to 20th	Night	36% 5% 12% 22% 19% 6%	1875
	21st to end	Night	40% 6% 12% 25% 12% 5%	1899
May	1st to 10th	Night	52% 6% 11% 19% 10% 3	2840
	11th to 20th	Night	50% 8% 11% 21% 9% 1	2723
	21st to end	Night	34% 7% 18% 26% 11% 4	2739
June	1st to 10th	Night	34% 9% 13% 26% 16% 2	1520
	11th to 20th	Night	36% 8% 15% 25% 14% 2	1520
	21st to end	Night	32% 9% 15% 24% 17% 3	1520
July	1st to 10th	Night	36% 10% 20% 17% 13% 4	2480
	11th to 20th	Night	37% 11% 17% 23% 11% 1	2740
	21st to end	Night	40% 9% 15% 20% 15% 1	2988
August	1st to 10th	Night	46% 7% 15% 24% 7% 1	2814
	11th to 20th	Night	39% 9% 12% 25% 15% 1	2874
	21st to end	Night	33% 7% 14% 29% 15% 2	3476
September	1st to 10th	Night	39% 6% 11% 20% 19% 4	1900
	11th to 20th	Night	35% 5% 9% 28% 21% 3	1923
	21st to end	Night	46% 5% 9% 21% 17% 3	2184
October	1st to 10th	Night	40% 5% 9% 21% 21% 4	3800
	11th to 20th	Night	23% 3 11% 23% 31% 8%	3779
	21st to end	Night	23% 4 9% 32% 25% 7%	4120
November	1st to 10th	Night	33% 4 10% 26% 22% 6%	2302
	11th to 20th	Night	36% 4 7% 25% 22% 6%	2540
	21st to end	Night	36% 4 12% 25% 20% 4	2660
December	1st to 10th	Night	43% 5% 11% 26% 13% 2	2660
	11th to 20th	Night	41% 4 10% 24% 17% 4	3288
	21st to end	Night	42% 7% 16% 21% 13% 1	4884

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	29% 25% 26% 16% 4	231
	11th to 20th	Day	27% 26% 29% 15% 3	270
	21st to end	Day	22% 27% 34% 13% 4 1	297
February	1st to 10th	Day	22% 23% 36% 14% 4	270
	11th to 20th	Day	32% 25% 35% 7% 1	278
	21st to end	Day	27% 19% 35% 16% 3	382
March	1st to 10th	Day	22% 23% 27% 25% 3	460
	11th to 20th	Day	23% 23% 30% 17% 6% 1	460
	21st to end	Day	21% 19% 33% 20% 6% 1	506
April	1st to 10th	Day	22% 22% 26% 21% 8% 1	460
	11th to 20th	Day	15% 19% 28% 22% 14% 3	452
	21st to end	Day	24% 14% 30% 19% 10% 2	460
May	1st to 10th	Day	22% 16% 28% 18% 13% 3	463
	11th to 20th	Day	22% 10% 28% 22% 14% 5%	487
	21st to end	Day	18% 5% 24% 26% 21% 7%	529
June	1st to 10th	Day	14% 9% 25% 26% 20% 7%	490
	11th to 20th	Day	13% 9% 25% 29% 18% 5%	490
	21st to end	Day	11% 6% 28% 29% 21% 6%	490
July	1st to 10th	Day	11% 5% 15% 31% 26% 13%	485
	11th to 20th	Day	6% 3 19% 34% 28% 10%	484
	21st to end	Day	12% 4 20% 33% 24% 8%	532
August	1st to 10th	Day	12% 5% 17% 28% 28% 11%	486
	11th to 20th	Day	11% 5% 20% 29% 23% 12%	479
	21st to end	Day	8% 5% 18% 30% 24% 15%	539
September	1st to 10th	Day	16% 8% 17% 26% 21% 12%	490
	11th to 20th	Day	15% 4 18% 30% 22% 12%	490
	21st to end	Day	26% 11% 18% 25% 16% 3	490
October	1st to 10th	Day	18% 9% 19% 27% 22% 6%	490
	11th to 20th	Day	16% 14% 26% 29% 13% 3	490
	21st to end	Day	16% 12% 34% 25% 11% 3	539
November	1st to 10th	Day	17% 11% 28% 28% 13% 3	448
	11th to 20th	Day	20% 15% 29% 24% 11% 1	298
	21st to end	Day	18% 19% 31% 25% 6% 1	180
December	1st to 10th	Day	18% 22% 33% 22% 5% 1	180
	11th to 20th	Day	23% 18% 29% 24% 6%	180
	21st to end	Day	22% 16% 32% 22% 9%	198
January	1st to 10th	Night	17% 18% 40% 22% 3	760
	11th to 20th	Night	21% 13% 33% 28% 4	760
	21st to end	Night	18% 15% 42% 22% 2	836
February	1st to 10th	Night	16% 15% 38% 28% 2	760
	11th to 20th	Night	21% 20% 39% 18% 2	743
	21st to end	Night	23% 16% 38% 20% 3	628
March	1st to 10th	Night	19% 15% 39% 24% 3	760
	11th to 20th	Night	22% 17% 33% 22% 5% 1	760
	21st to end	Night	19% 14% 39% 22% 5% 1	836
April	1st to 10th	Night	18% 18% 36% 24% 4	760
	11th to 20th	Night	15% 12% 36% 28% 9% 1	751
	21st to end	Night	19% 10% 32% 32% 7%	759
May	1st to 10th	Night	21% 6% 27% 33% 13%	570
	11th to 20th	Night	19% 5% 25% 37% 13%	510
	21st to end	Night	13% 3 20% 42% 21%	411
June	1st to 10th	Night	11% 3 24% 41% 22%	380
	11th to 20th	Night	12% 5% 19% 40% 23% 1	380
	21st to end	Night	6% 3 23% 47% 19% 1	380
July	1st to 10th	Night	11% 2 17% 40% 26% 4	370
	11th to 20th	Night	5% 2 14% 38% 38% 3	519
	21st to end	Night	8% 1 16% 44% 28% 3	624
August	1st to 10th	Night	10% 2 11% 44% 30% 3	567
	11th to 20th	Night	10% 3 15% 39% 31% 3	600
	21st to end	Night	13% 2 16% 40% 25% 4	836
September	1st to 10th	Night	16% 3 15% 34% 28% 4	760
	11th to 20th	Night	13% 3 17% 33% 30% 4	760
	21st to end	Night	24% 4 22% 29% 21% 1	760
October	1st to 10th	Night	21% 6% 20% 29% 22% 3	760
	11th to 20th	Night	14% 9% 27% 36% 14% 1	760
	21st to end	Night	17% 8% 32% 31% 11%	836
November	1st to 10th	Night	14% 8% 32% 35% 11% 1	755
	11th to 20th	Night	17% 12% 32% 29% 8% 1	760
	21st to end	Night	16% 12% 33% 31% 8%	760
December	1st to 10th	Night	19% 14% 36% 25% 6%	760
	11th to 20th	Night	17% 8% 41% 30% 4	760
	21st to end	Night	17% 12% 34% 34% 3	836

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