Sunken Meadow State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Sunken Meadow State Park clear sky chart from 2005-11-06 to 2024-01-15.

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	15% 6% 2 5% 5% 3 4 4 5% 8% 43%	74798
	Night	17% 6% 3 5% 5% 3 4 4 5% 7% 42%	74965
Transparency	Day	40% 6% 13% 23% 16% 2	74503
	Night	42% 6% 12% 22% 16% 2	74794
Seeing	Day	18% 6% 23% 32% 18% 4	13927
	Night	20% 7% 29% 30% 12% 2	23129

By Month

Percentage Cloud Cover NE (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	15% 5% 3 5% 5% 3 4 4 6% 8% 42%	1517
	11th to 20th	Day	16% 8% 4 6% 5% 3 4 5% 6% 7% 37%	1472
	21st to end	Day	15% 7% 3 6% 4 3 5% 4 4 8% 41%	1670
February	1st to 10th	Day	19% 6% 3 6% 5% 2 4 4 5% 7% 39%	1674
	11th to 20th	Day	15% 5% 3 5% 5% 3 5% 4 4 6% 45%	1748
	21st to end	Day	19% 8% 3 5% 5% 3 4 3 4 5% 40%	1480
March	1st to 10th	Day	13% 7% 3 5% 5% 3 4 4 5% 7% 44%	1797
	11th to 20th	Day	15% 6% 2 4 5% 2 5% 5% 6% 9% 41%	1856
	21st to end	Day	19% 8% 2 5% 5% 2 3 4 4 6% 41%	2376
April	1st to 10th	Day	17% 7% 3 5% 4 3 4 4 5% 6% 42%	2160
	11th to 20th	Day	16% 6% 2 5% 5% 2 4 4 4 6% 45%	2134
	21st to end	Day	20% 6% 2 4 3 2 5% 4 5% 7% 43%	2226
May	1st to 10th	Day	22% 7% 2 4 4 2 4 4 5% 8% 38%	2340
	11th to 20th	Day	18% 5% 2 4 5% 2 4 4 6% 8% 41%	2403
	21st to end	Day	13% 5% 2 4 4 3 5% 5% 6% 9% 44%	2725
June	1st to 10th	Day	17% 5% 2 5% 5% 2 4 5% 5% 9% 41%	2520
	11th to 20th	Day	14% 6% 3 4 5% 4 5% 6% 5% 9% 40%	2520
	21st to end	Day	10% 5% 3 5% 6% 3 4 5% 5% 9% 45%	2520
July	1st to 10th	Day	10% 5% 2 5% 5% 3 5% 5% 7% 9% 44%	2520
	11th to 20th	Day	10% 5% 2 5% 4 3 4 5% 7% 10% 45%	2520
	21st to end	Day	12% 5% 2 5% 5% 4 5% 5% 7% 8% 42%	2744
August	1st to 10th	Day	10% 5% 2 5% 5% 3 5% 5% 7% 11% 41%	2388
	11th to 20th	Day	12% 5% 2 5% 4 4 4 4 5% 9% 45%	2126
	21st to end	Day	12% 4 2 5% 5% 3 3 5% 6% 8% 46%	2376
September	1st to 10th	Day	13% 5% 2 4 5% 3 5% 5% 5% 7% 46%	2160
	11th to 20th	Day	13% 5% 2 4 3 2 3 4 5% 7% 52%	2048
	21st to end	Day	17% 7% 2 5% 5% 3 5% 4 5% 6% 43%	1980
October	1st to 10th	Day	23% 5% 2 4 3 2 3 4 4 7% 44%	1936
	11th to 20th	Day	16% 5% 2 5% 5% 3 4 4 5% 7% 46%	1800
	21st to end	Day	20% 5% 1 5% 5% 3 5% 4 5% 7% 40%	1796
November	1st to 10th	Day	15% 5% 2 4 6% 3 4 4 3 6% 49%	1671
	11th to 20th	Day	18% 6% 2 5% 4 2 3 4 3 7% 48%	1710
	21st to end	Day	14% 7% 3 5% 4 2 4 4 5% 7% 45%	1687
December	1st to 10th	Day	17% 6% 3 6% 5% 3 5% 4 7% 8% 36%	1520
	11th to 20th	Day	21% 8% 2 4 3 1 3 3 4 6% 45%	1906
	21st to end	Day	18% 10% 4 8% 5% 3 4 4 5% 7% 33%	2772
January	1st to 10th	Night	16% 7% 2 4 5% 3 3 4 4 10% 43%	2649
	11th to 20th	Night	19% 7% 3 5% 5% 3 4 4 5% 6% 39%	2577
	21st to end	Night	14% 8% 4 5% 4 2 3 4 5% 8% 43%	2682
February	1st to 10th	Night	17% 9% 3 5% 5% 2 4 4 5% 6% 39%	2283
	11th to 20th	Night	19% 7% 3 5% 5% 2 4 5% 5% 6% 39%	2098
	21st to end	Night	21% 6% 2 5% 4 3 4 3 5% 6% 42%	1776
March	1st to 10th	Night	17% 6% 2 4 4 3 4 4 5% 7% 45%	2150
	11th to 20th	Night	17% 5% 2 5% 5% 4 4 5% 5% 7% 41%	2098
	21st to end	Night	17% 9% 3 6% 4 3 4 4 5% 7% 40%	1980
April	1st to 10th	Night	18% 7% 3 5% 5% 3 4 5% 6% 6% 39%	1800
	11th to 20th	Night	19% 6% 3 5% 5% 2 4 4 4 7% 41%	1775
	21st to end	Night	19% 7% 4 5% 5% 2 3 4 4 5% 42%	1733
May	1st to 10th	Night	22% 7% 3 6% 4 3 5% 4 4 7% 34%	1620
	11th to 20th	Night	19% 9% 3 5% 5% 2 5% 4 6% 6% 36%	1505
	21st to end	Night	16% 7% 3 5% 5% 3 4 5% 5% 7% 39%	1550
June	1st to 10th	Night	18% 7% 3 3 6% 3 4 4 4 8% 40%	1440
	11th to 20th	Night	15% 6% 2 5% 4 2 4 5% 6% 10% 40%	1440
	21st to end	Night	10% 5% 3 5% 5% 4 5% 6% 6% 10% 41%	1440
July	1st to 10th	Night	11% 6% 3 5% 5% 3 7% 5% 8% 9% 39%	1440
	11th to 20th	Night	11% 5% 3 6% 4 3 6% 6% 6% 10% 39%	1440
	21st to end	Night	11% 5% 2 4 5% 3 5% 6% 6% 10% 41%	1574
August	1st to 10th	Night	8% 4 2 5% 4 4 5% 6% 8% 9% 45%	1528
	11th to 20th	Night	12% 6% 3 6% 6% 4 5% 5% 7% 9% 37%	1774
	21st to end	Night	13% 5% 2 5% 4 3 5% 5% 6% 8% 45%	1980
September	1st to 10th	Night	14% 5% 2 6% 5% 3 5% 4 6% 6% 44%	1800
	11th to 20th	Night	15% 4 2 5% 4 2 4 4 4 6% 51%	1911
	21st to end	Night	18% 5% 2 5% 5% 3 4 3 4 7% 44%	1980
October	1st to 10th	Night	20% 8% 3 5% 5% 3 4 3 4 6% 40%	2022
	11th to 20th	Night	16% 4 2 5% 5% 3 3 3 5% 7% 47%	2160
	21st to end	Night	22% 6% 3 5% 5% 3 4 4 4 6% 40%	2560
November	1st to 10th	Night	13% 6% 2 5% 5% 3 4 4 5% 5% 48%	2407
	11th to 20th	Night	19% 6% 3 3 4 2 3 4 4 5% 47%	2470
	21st to end	Night	15% 5% 2 4 5% 3 4 4 6% 7% 47%	2491
December	1st to 10th	Night	21% 7% 3 5% 4 3 4 4 4 7% 39%	2660
	11th to 20th	Night	20% 6% 2 5% 4 3 4 4 5% 6% 42%	3288
	21st to end	Night	20% 9% 3 6% 5% 3 4 4 5% 6% 37%	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% 5% 12% 28% 12% 3	1518
	11th to 20th	Day	45% 5% 14% 22% 12% 2	1472
	21st to end	Day	43% 3 12% 25% 15% 2	1670
February	1st to 10th	Day	45% 5% 14% 22% 13% 1	1674
	11th to 20th	Day	41% 4 11% 25% 16% 3	1757
	21st to end	Day	47% 5% 10% 21% 15% 3	1480
March	1st to 10th	Day	39% 6% 14% 22% 16% 3	1800
	11th to 20th	Day	39% 6% 13% 24% 16% 2	1856
	21st to end	Day	46% 4 9% 18% 18% 5%	2376
April	1st to 10th	Day	42% 6% 11% 21% 17% 4	2160
	11th to 20th	Day	40% 4 13% 21% 18% 3	2134
	21st to end	Day	42% 5% 12% 21% 16% 4	2226
May	1st to 10th	Day	46% 7% 10% 20% 15% 2	2340
	11th to 20th	Day	41% 7% 12% 21% 16% 3	2407
	21st to end	Day	37% 9% 18% 21% 14% 2	2725
June	1st to 10th	Day	40% 8% 13% 23% 14% 2	2520
	11th to 20th	Day	41% 8% 13% 23% 13% 1	2520
	21st to end	Day	36% 9% 15% 24% 15% 1	2520
July	1st to 10th	Day	36% 9% 15% 23% 17% 1	2450
	11th to 20th	Day	34% 8% 16% 26% 14% 2	2445
	21st to end	Day	37% 9% 13% 22% 17% 2	2591
August	1st to 10th	Day	35% 10% 16% 24% 15% 1	2374
	11th to 20th	Day	37% 7% 16% 25% 14% 1	2126
	21st to end	Day	35% 8% 13% 22% 20% 2	2376
September	1st to 10th	Day	37% 7% 14% 21% 18% 2	2160
	11th to 20th	Day	33% 5% 13% 24% 24% 2	2048
	21st to end	Day	42% 6% 9% 20% 20% 3	1980
October	1st to 10th	Day	42% 6% 10% 22% 18% 2	1936
	11th to 20th	Day	37% 6% 12% 25% 18% 2	1800
	21st to end	Day	44% 6% 10% 22% 17% 2	1796
November	1st to 10th	Day	37% 5% 13% 23% 20% 2	1671
	11th to 20th	Day	40% 3 10% 23% 22% 3	1710
	21st to end	Day	39% 5% 14% 28% 12% 2	1687
December	1st to 10th	Day	44% 6% 16% 19% 14% 1	1520
	11th to 20th	Day	42% 4 15% 20% 17% 2	1906
	21st to end	Day	50% 7% 12% 22% 9% 1	2772
January	1st to 10th	Night	40% 4 11% 24% 17% 4	2649
	11th to 20th	Night	45% 7% 13% 23% 10% 2	2577
	21st to end	Night	40% 4 11% 23% 19% 2	2682
February	1st to 10th	Night	45% 6% 12% 22% 13% 2	2283
	11th to 20th	Night	45% 5% 10% 20% 16% 4	2100
	21st to end	Night	44% 4 8% 24% 17% 4	1776
March	1st to 10th	Night	40% 5% 12% 23% 15% 4	2160
	11th to 20th	Night	43% 5% 9% 23% 17% 4	2099
	21st to end	Night	44% 5% 9% 18% 18% 6%	1980
April	1st to 10th	Night	46% 6% 10% 18% 18% 3	1800
	11th to 20th	Night	44% 6% 10% 18% 21% 2	1775
	21st to end	Night	46% 4 9% 20% 16% 5%	1733
May	1st to 10th	Night	50% 6% 9% 17% 15% 2	1620
	11th to 20th	Night	48% 6% 10% 17% 17% 2	1506
	21st to end	Night	44% 8% 15% 20% 12% 1	1551
June	1st to 10th	Night	44% 6% 10% 21% 18% 2	1440
	11th to 20th	Night	40% 9% 13% 25% 12% 1	1440
	21st to end	Night	37% 8% 14% 26% 14% 1	1440
July	1st to 10th	Night	39% 11% 14% 20% 15% 2	1400
	11th to 20th	Night	39% 9% 13% 27% 12% 1	1392
	21st to end	Night	35% 9% 16% 23% 14% 2	1486
August	1st to 10th	Night	32% 10% 18% 24% 15% 1	1518
	11th to 20th	Night	40% 8% 14% 25% 11% 1	1774
	21st to end	Night	36% 8% 13% 22% 19% 2	1980
September	1st to 10th	Night	40% 7% 11% 25% 17% 2	1800
	11th to 20th	Night	34% 6% 11% 23% 23% 3	1911
	21st to end	Night	42% 6% 7% 21% 21% 3	1980
October	1st to 10th	Night	47% 5% 10% 21% 14% 3	2022
	11th to 20th	Night	37% 5% 13% 29% 15% 1	2160
	21st to end	Night	45% 6% 11% 21% 16% 1	2560
November	1st to 10th	Night	38% 5% 11% 22% 20% 4	2407
	11th to 20th	Night	40% 4 9% 24% 18% 4	2470
	21st to end	Night	38% 5% 13% 29% 14% 2	2491
December	1st to 10th	Night	46% 5% 13% 21% 14% 1	2660
	11th to 20th	Night	44% 5% 12% 19% 18% 2	3288
	21st to end	Night	48% 5% 12% 23% 12% 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	21% 12% 33% 25% 8% 1	180
	11th to 20th	Day	16% 16% 38% 24% 5% 1	168
	21st to end	Day	20% 5% 41% 25% 7% 2	214
February	1st to 10th	Day	26% 9% 35% 27% 3	294
	11th to 20th	Day	20% 9% 40% 29% 3	416
	21st to end	Day	25% 11% 33% 25% 6%	346
March	1st to 10th	Day	14% 10% 39% 31% 7%	420
	11th to 20th	Day	17% 7% 39% 30% 5% 1	420
	21st to end	Day	23% 8% 32% 27% 8% 2	462
April	1st to 10th	Day	20% 8% 33% 26% 11% 1	420
	11th to 20th	Day	18% 7% 25% 36% 15% 1	412
	21st to end	Day	26% 7% 24% 34% 10% 1	420
May	1st to 10th	Day	27% 5% 25% 33% 9% 2	423
	11th to 20th	Day	20% 3 21% 37% 18% 1	447
	21st to end	Day	18% 1 13% 32% 30% 6%	485
June	1st to 10th	Day	19% 3 12% 35% 26% 4	450
	11th to 20th	Day	16% 3 16% 39% 22% 3	450
	21st to end	Day	12% 2 14% 37% 30% 6%	450
July	1st to 10th	Day	12% 2 10% 34% 33% 10%	445
	11th to 20th	Day	9% 3 7% 35% 36% 9%	444
	21st to end	Day	13% 3 11% 36% 33% 5%	488
August	1st to 10th	Day	11% 1 9% 41% 29% 9%	446
	11th to 20th	Day	15% 3 7% 35% 32% 8%	439
	21st to end	Day	11% 3 12% 37% 26% 11%	495
September	1st to 10th	Day	18% 2 15% 29% 24% 12%	450
	11th to 20th	Day	16% 2 14% 30% 26% 12%	450
	21st to end	Day	21% 3 19% 33% 20% 5%	450
October	1st to 10th	Day	26% 3 17% 27% 19% 8%	450
	11th to 20th	Day	15% 6% 26% 34% 17% 3	450
	21st to end	Day	23% 8% 29% 25% 13% 2	403
November	1st to 10th	Day	15% 7% 23% 34% 17% 4	365
	11th to 20th	Day	19% 14% 31% 27% 8% 1	370
	21st to end	Day	17% 11% 30% 30% 10% 1	347
December	1st to 10th	Day	19% 10% 37% 22% 12%	180
	11th to 20th	Day	27% 15% 26% 26% 6%	180
	21st to end	Day	21% 12% 34% 24% 8% 1	198
January	1st to 10th	Night	19% 14% 40% 23% 4	760
	11th to 20th	Night	25% 11% 34% 28% 3	737
	21st to end	Night	19% 13% 41% 24% 3	792
February	1st to 10th	Night	21% 11% 38% 27% 3	720
	11th to 20th	Night	23% 10% 44% 21% 2	703
	21st to end	Night	24% 10% 38% 24% 4	592
March	1st to 10th	Night	20% 9% 40% 25% 6%	720
	11th to 20th	Night	19% 8% 39% 26% 6% 1	720
	21st to end	Night	21% 6% 38% 27% 6% 1	792
April	1st to 10th	Night	22% 7% 36% 29% 6% 1	720
	11th to 20th	Night	20% 6% 31% 32% 10%	711
	21st to end	Night	22% 4 30% 35% 8% 1	653
May	1st to 10th	Night	24% 5% 27% 30% 11% 2	540
	11th to 20th	Night	21% 4 30% 33% 10%	444
	21st to end	Night	21% 3 13% 37% 25% 2	389
June	1st to 10th	Night	21% 2 20% 36% 19% 2	360
	11th to 20th	Night	18% 3 12% 46% 21% 1	360
	21st to end	Night	10% 2 16% 50% 21% 2	360
July	1st to 10th	Night	13% 3 12% 41% 28% 2	350
	11th to 20th	Night	12% 2 11% 47% 24% 4	348
	21st to end	Night	14% 2 13% 48% 22% 1	394
August	1st to 10th	Night	8% 1 13% 47% 28% 2	454
	11th to 20th	Night	15% 3 13% 35% 32% 3	710
	21st to end	Night	14% 3 12% 37% 29% 5%	792
September	1st to 10th	Night	17% 1 20% 36% 21% 5%	720
	11th to 20th	Night	18% 3 16% 37% 22% 6%	720
	21st to end	Night	21% 2 21% 33% 20% 3	720
October	1st to 10th	Night	24% 6% 24% 25% 17% 4	720
	11th to 20th	Night	18% 7% 26% 34% 13% 1	720
	21st to end	Night	25% 8% 32% 27% 8% 1	792
November	1st to 10th	Night	15% 8% 31% 30% 13% 2	740
	11th to 20th	Night	21% 10% 34% 25% 9% 1	760
	21st to end	Night	17% 12% 34% 28% 8% 1	760
December	1st to 10th	Night	24% 13% 34% 23% 6% 1	760
	11th to 20th	Night	22% 11% 38% 24% 4	760
	21st to end	Night	23% 12% 38% 23% 4	836

Page generated at 2024-01-11 22:33:52. Version ac07

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