Stonelick Lake State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Stonelick Lake State Park clear sky chart from 2005-11-06 to 2024-03-18.

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% 9% 4 7% 6% 3 5% 5% 5% 7% 35%	79519
	Night	15% 9% 4 6% 5% 3 4 4 5% 7% 37%	80267
Transparency	Day	47% 7% 12% 20% 12% 2	79236
	Night	46% 7% 11% 20% 13% 2	80071
Seeing	Day	18% 11% 26% 23% 15% 7%	14312
	Night	18% 9% 27% 29% 15% 2	23997

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% 16% 7% 9% 6% 3 4 4 5% 6% 25%	2836
	11th to 20th	Day	17% 14% 6% 13% 7% 6% 6% 4 3 4 20%	2840
	21st to end	Day	29% 15% 9% 7% 6% 3 3 3 3 5% 17%	3124
February	1st to 10th	Day	20% 12% 5% 8% 7% 3 5% 4 4 5% 28%	1786
	11th to 20th	Day	17% 10% 6% 10% 6% 4 4 4 4 6% 30%	1848
	21st to end	Day	18% 14% 5% 9% 5% 3 4 3 4 6% 30%	1570
March	1st to 10th	Day	18% 11% 4 6% 6% 3 4 4 5% 7% 33%	1930
	11th to 20th	Day	18% 9% 4 7% 6% 3 5% 5% 5% 6% 31%	2058
	21st to end	Day	22% 10% 4 6% 6% 3 6% 4 4 7% 29%	2178
April	1st to 10th	Day	15% 7% 4 6% 6% 4 4 5% 6% 7% 37%	2096
	11th to 20th	Day	16% 8% 2 7% 5% 3 4 4 4 7% 39%	2199
	21st to end	Day	18% 8% 3 6% 6% 3 5% 5% 4 7% 34%	2340
May	1st to 10th	Day	21% 7% 3 6% 5% 3 5% 5% 4 7% 34%	2340
	11th to 20th	Day	19% 8% 3 7% 6% 3 5% 5% 5% 7% 33%	2301
	21st to end	Day	9% 5% 3 6% 7% 4 6% 7% 7% 9% 37%	2531
June	1st to 10th	Day	12% 5% 2 5% 5% 4 5% 6% 7% 9% 40%	2340
	11th to 20th	Day	10% 5% 2 5% 5% 3 5% 5% 6% 11% 43%	2455
	21st to end	Day	9% 5% 3 6% 5% 4 5% 5% 7% 10% 41%	2520
July	1st to 10th	Day	12% 5% 3 7% 5% 4 5% 6% 7% 8% 38%	2520
	11th to 20th	Day	8% 5% 3 6% 6% 3 6% 6% 6% 11% 40%	2376
	21st to end	Day	10% 5% 2 4 5% 4 6% 6% 7% 10% 41%	2547
August	1st to 10th	Day	8% 5% 2 4 6% 4 5% 5% 7% 10% 43%	2327
	11th to 20th	Day	8% 6% 3 6% 5% 4 6% 6% 7% 11% 39%	2303
	21st to end	Day	7% 6% 2 5% 5% 3 5% 4 6% 9% 47%	2423
September	1st to 10th	Day	13% 5% 2 5% 4 3 3 4 5% 7% 47%	2033
	11th to 20th	Day	10% 5% 2 5% 4 3 4 5% 7% 9% 48%	1980
	21st to end	Day	15% 5% 3 5% 5% 3 3 2 5% 6% 48%	1980
October	1st to 10th	Day	12% 4 2 4 5% 3 4 6% 6% 6% 48%	1980
	11th to 20th	Day	15% 7% 2 5% 5% 3 4 4 5% 7% 45%	1811
	21st to end	Day	20% 8% 3 5% 5% 2 3 4 4 7% 37%	1868
November	1st to 10th	Day	9% 7% 2 5% 4 2 4 4 4 7% 52%	1672
	11th to 20th	Day	14% 10% 5% 6% 6% 3 4 5% 4 5% 37%	1710
	21st to end	Day	17% 10% 4 7% 5% 4 3 4 4 6% 36%	1710
December	1st to 10th	Day	20% 13% 6% 9% 7% 3 5% 4 4 5% 24%	1710
	11th to 20th	Day	16% 13% 5% 9% 7% 3 5% 4 5% 5% 28%	2153
	21st to end	Day	22% 20% 5% 9% 6% 3 5% 4 4 6% 17%	3124
January	1st to 10th	Night	15% 17% 7% 10% 8% 3 4 5% 5% 5% 21%	4109
	11th to 20th	Night	16% 15% 6% 12% 9% 4 4 3 4 5% 23%	4120
	21st to end	Night	26% 17% 7% 7% 5% 3 3 3 4 5% 21%	4532
February	1st to 10th	Night	21% 12% 5% 6% 6% 3 4 4 5% 5% 29%	2390
	11th to 20th	Night	18% 10% 4 7% 5% 3 5% 5% 5% 6% 31%	2218
	21st to end	Night	21% 14% 5% 7% 5% 3 3 3 4 6% 30%	1884
March	1st to 10th	Night	17% 9% 4 6% 6% 3 4 4 4 5% 38%	2250
	11th to 20th	Night	18% 8% 3 6% 5% 4 5% 5% 5% 7% 35%	2068
	21st to end	Night	20% 9% 4 7% 5% 3 4 5% 5% 7% 33%	2178
April	1st to 10th	Night	15% 7% 3 5% 5% 3 4 5% 6% 7% 39%	1879
	11th to 20th	Night	14% 7% 3 5% 4 3 4 5% 6% 8% 41%	1708
	21st to end	Night	18% 6% 4 5% 4 3 5% 4 6% 6% 38%	1620
May	1st to 10th	Night	17% 8% 3 7% 6% 3 4 5% 5% 8% 33%	1620
	11th to 20th	Night	16% 7% 3 6% 4 3 5% 5% 6% 7% 38%	1592
	21st to end	Night	7% 5% 2 4 6% 3 5% 7% 7% 12% 43%	1744
June	1st to 10th	Night	8% 4 3 5% 5% 3 5% 5% 5% 8% 50%	1620
	11th to 20th	Night	8% 3 2 4 5% 2 5% 5% 7% 11% 48%	1497
	21st to end	Night	7% 3 2 5% 5% 3 5% 7% 7% 10% 47%	1440
July	1st to 10th	Night	10% 5% 2 5% 4 3 4 5% 5% 10% 47%	1440
	11th to 20th	Night	6% 4 2 5% 4 3 5% 5% 6% 11% 48%	1579
	21st to end	Night	9% 4 2 6% 5% 3 5% 4 6% 8% 48%	1771
August	1st to 10th	Night	7% 5% 2 5% 4 3 5% 5% 7% 9% 48%	1611
	11th to 20th	Night	7% 5% 2 5% 4 4 5% 5% 7% 9% 47%	1598
	21st to end	Night	7% 3 1 4 4 3 5% 4 6% 9% 55%	1930
September	1st to 10th	Night	11% 5% 2 4 4 3 4 4 5% 7% 51%	1908
	11th to 20th	Night	8% 4 2 4 5% 2 4 5% 5% 8% 54%	1980
	21st to end	Night	13% 6% 2 4 5% 3 4 4 3 6% 51%	1980
October	1st to 10th	Night	9% 4 2 5% 4 3 4 3 5% 6% 54%	1980
	11th to 20th	Night	14% 7% 2 5% 5% 3 4 4 5% 7% 44%	2147
	21st to end	Night	19% 7% 3 4 5% 3 4 4 5% 6% 40%	2484
November	1st to 10th	Night	14% 7% 3 5% 4 3 4 4 5% 7% 47%	2406
	11th to 20th	Night	16% 7% 3 6% 5% 3 4 4 4 7% 40%	2470
	21st to end	Night	18% 12% 3 6% 6% 3 4 4 5% 7% 33%	2470
December	1st to 10th	Night	20% 12% 5% 8% 6% 2 4 4 4 6% 28%	2470
	11th to 20th	Night	18% 12% 6% 8% 5% 3 4 3 4 7% 29%	3042
	21st to end	Night	19% 17% 7% 9% 8% 4 5% 4 4 6% 17%	4532

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	61% 5% 12% 13% 9%	2837
	11th to 20th	Day	64% 8% 10% 12% 5%	2840
	21st to end	Day	70% 5% 9% 13% 3	3124
February	1st to 10th	Day	58% 4 10% 16% 10% 1	1786
	11th to 20th	Day	56% 5% 11% 17% 10% 1	1858
	21st to end	Day	57% 5% 9% 20% 8% 2	1570
March	1st to 10th	Day	50% 6% 11% 22% 9% 1	1930
	11th to 20th	Day	52% 7% 10% 19% 11% 1	2058
	21st to end	Day	56% 5% 10% 19% 8% 1	2178
April	1st to 10th	Day	45% 7% 11% 23% 12% 1	2096
	11th to 20th	Day	44% 7% 11% 21% 14% 3	2199
	21st to end	Day	49% 7% 11% 21% 10% 2	2340
May	1st to 10th	Day	50% 7% 13% 20% 9% 1	2340
	11th to 20th	Day	50% 8% 12% 17% 12% 1	2305
	21st to end	Day	39% 12% 15% 22% 12% 1	2531
June	1st to 10th	Day	38% 9% 12% 23% 15% 2	2340
	11th to 20th	Day	35% 9% 15% 24% 16% 1	2455
	21st to end	Day	38% 9% 15% 21% 13% 4	2520
July	1st to 10th	Day	41% 9% 13% 18% 17% 2	2451
	11th to 20th	Day	36% 9% 14% 23% 16% 1	2305
	21st to end	Day	36% 10% 17% 22% 12% 3	2405
August	1st to 10th	Day	34% 10% 15% 26% 13% 1	2314
	11th to 20th	Day	37% 8% 15% 25% 14% 1	2303
	21st to end	Day	33% 8% 14% 22% 17% 6%	2423
September	1st to 10th	Day	35% 7% 12% 23% 17% 5%	2033
	11th to 20th	Day	32% 7% 13% 25% 21% 2	1980
	21st to end	Day	37% 5% 10% 23% 22% 2	1980
October	1st to 10th	Day	35% 8% 11% 23% 21% 2	1980
	11th to 20th	Day	39% 5% 8% 26% 18% 3	1811
	21st to end	Day	47% 5% 12% 20% 15% 2	1868
November	1st to 10th	Day	33% 5% 11% 28% 21% 3	1672
	11th to 20th	Day	48% 5% 8% 21% 16% 3	1710
	21st to end	Day	50% 4 11% 22% 13% 1	1710
December	1st to 10th	Day	62% 5% 11% 16% 5%	1710
	11th to 20th	Day	58% 6% 9% 17% 10%	2150
	21st to end	Day	67% 7% 9% 10% 6% 1	3124
January	1st to 10th	Night	62% 8% 8% 13% 8%	4109
	11th to 20th	Night	64% 6% 9% 14% 6%	4120
	21st to end	Night	65% 5% 9% 16% 5% 1	4532
February	1st to 10th	Night	57% 5% 11% 18% 8% 1	2390
	11th to 20th	Night	53% 5% 11% 19% 11% 1	2219
	21st to end	Night	56% 5% 10% 16% 9% 2	1884
March	1st to 10th	Night	49% 5% 8% 22% 14% 2	2250
	11th to 20th	Night	48% 6% 12% 20% 11% 2	2068
	21st to end	Night	51% 7% 10% 21% 9% 2	2178
April	1st to 10th	Night	43% 8% 11% 25% 12% 2	1879
	11th to 20th	Night	40% 7% 12% 17% 19% 6%	1708
	21st to end	Night	45% 7% 10% 21% 14% 3	1620
May	1st to 10th	Night	48% 9% 11% 19% 10% 3	1620
	11th to 20th	Night	43% 9% 14% 19% 13% 2	1593
	21st to end	Night	32% 10% 18% 22% 15% 3	1745
June	1st to 10th	Night	30% 8% 12% 27% 20% 3	1620
	11th to 20th	Night	28% 10% 16% 22% 19% 4	1497
	21st to end	Night	28% 12% 17% 22% 16% 5%	1440
July	1st to 10th	Night	34% 9% 13% 21% 20% 4	1400
	11th to 20th	Night	29% 9% 15% 26% 18% 3	1528
	21st to end	Night	31% 7% 14% 29% 16% 2	1672
August	1st to 10th	Night	30% 9% 17% 28% 15% 3	1600
	11th to 20th	Night	32% 9% 16% 26% 15% 2	1598
	21st to end	Night	25% 8% 16% 25% 21% 5%	1930
September	1st to 10th	Night	32% 7% 13% 25% 16% 7%	1908
	11th to 20th	Night	28% 8% 12% 23% 27% 2	1980
	21st to end	Night	35% 5% 10% 21% 26% 2	1980
October	1st to 10th	Night	30% 6% 12% 26% 22% 3	1980
	11th to 20th	Night	39% 6% 10% 24% 19% 2	2147
	21st to end	Night	45% 5% 10% 22% 16% 3	2484
November	1st to 10th	Night	38% 5% 11% 21% 22% 4	2406
	11th to 20th	Night	44% 5% 9% 20% 18% 3	2470
	21st to end	Night	52% 4 10% 21% 11% 2	2470
December	1st to 10th	Night	57% 6% 10% 18% 8% 1	2470
	11th to 20th	Night	55% 6% 10% 20% 9% 1	3044
	21st to end	Night	67% 7% 8% 13% 4	4532

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	24% 23% 34% 14% 5%	270
	11th to 20th	Day	26% 23% 37% 11% 3	270
	21st to end	Day	32% 20% 32% 13% 3	297
February	1st to 10th	Day	28% 24% 31% 14% 3	270
	11th to 20th	Day	29% 24% 34% 10% 2	270
	21st to end	Day	31% 17% 42% 8% 1	225
March	1st to 10th	Day	22% 27% 35% 13% 2	300
	11th to 20th	Day	23% 16% 37% 18% 6%	449
	21st to end	Day	29% 19% 29% 17% 6%	462
April	1st to 10th	Day	18% 18% 29% 24% 10% 1	420
	11th to 20th	Day	21% 18% 25% 21% 12% 3	412
	21st to end	Day	23% 15% 34% 17% 9% 2	420
May	1st to 10th	Day	23% 13% 33% 18% 8% 4	423
	11th to 20th	Day	21% 8% 27% 26% 13% 5%	447
	21st to end	Day	15% 4 24% 27% 20% 10%	485
June	1st to 10th	Day	13% 6% 20% 30% 22% 8%	450
	11th to 20th	Day	12% 5% 22% 32% 23% 7%	565
	21st to end	Day	11% 4 23% 32% 21% 9%	630
July	1st to 10th	Day	13% 4 16% 24% 24% 21%	621
	11th to 20th	Day	10% 3 18% 30% 26% 13%	478
	21st to end	Day	11% 3 16% 29% 26% 15%	488
August	1st to 10th	Day	12% 3 12% 27% 30% 16%	446
	11th to 20th	Day	11% 4 18% 31% 24% 13%	439
	21st to end	Day	9% 4 14% 29% 29% 15%	495
September	1st to 10th	Day	12% 3 18% 27% 28% 12%	450
	11th to 20th	Day	12% 3 16% 23% 32% 14%	450
	21st to end	Day	16% 8% 21% 25% 22% 8%	450
October	1st to 10th	Day	10% 6% 25% 32% 18% 8%	450
	11th to 20th	Day	17% 14% 32% 22% 12% 3	450
	21st to end	Day	23% 14% 35% 22% 5%	383
November	1st to 10th	Day	16% 11% 34% 25% 11% 3	270
	11th to 20th	Day	21% 22% 27% 20% 7% 3	270
	21st to end	Day	23% 14% 39% 20% 3	270
December	1st to 10th	Day	21% 22% 36% 16% 5% 1	270
	11th to 20th	Day	18% 22% 39% 16% 6%	270
	21st to end	Day	30% 20% 34% 13% 3	297
January	1st to 10th	Night	21% 20% 34% 20% 5%	760
	11th to 20th	Night	27% 17% 34% 19% 3	760
	21st to end	Night	24% 16% 34% 24% 3	836
February	1st to 10th	Night	28% 12% 34% 24% 2	760
	11th to 20th	Night	24% 16% 37% 21% 2	743
	21st to end	Night	28% 13% 37% 20% 1	628
March	1st to 10th	Night	22% 14% 36% 23% 5%	760
	11th to 20th	Night	22% 14% 35% 22% 6% 1	752
	21st to end	Night	24% 9% 32% 27% 7%	792
April	1st to 10th	Night	19% 12% 34% 27% 8%	619
	11th to 20th	Night	17% 11% 31% 28% 12% 1	533
	21st to end	Night	19% 8% 37% 27% 8% 1	540
May	1st to 10th	Night	21% 8% 31% 27% 11% 1	540
	11th to 20th	Night	17% 4 25% 34% 18% 2	531
	21st to end	Night	9% 2 22% 37% 24% 6%	584
June	1st to 10th	Night	9% 2 21% 43% 24% 1	540
	11th to 20th	Night	11% 3 14% 42% 27% 3	540
	21st to end	Night	7% 2 20% 44% 26% 2	540
July	1st to 10th	Night	12% 1 12% 30% 34% 10%	525
	11th to 20th	Night	7% 2 13% 36% 37% 4	522
	21st to end	Night	11% 2 11% 38% 34% 4	591
August	1st to 10th	Night	9% 1 9% 42% 36% 4	537
	11th to 20th	Night	10% 1 12% 42% 30% 5%	534
	21st to end	Night	7% 1 14% 34% 36% 7%	594
September	1st to 10th	Night	15% 2 14% 32% 34% 4	648
	11th to 20th	Night	10% 2 15% 34% 33% 6%	720
	21st to end	Night	14% 5% 22% 32% 25% 2	720
October	1st to 10th	Night	12% 4 22% 35% 23% 4	720
	11th to 20th	Night	18% 9% 27% 32% 13% 1	720
	21st to end	Night	23% 8% 33% 25% 11%	792
November	1st to 10th	Night	17% 9% 30% 28% 15% 1	740
	11th to 20th	Night	18% 15% 31% 25% 9% 1	760
	21st to end	Night	24% 12% 26% 29% 8% 1	760
December	1st to 10th	Night	26% 13% 33% 23% 5%	760
	11th to 20th	Night	25% 10% 34% 24% 6% 1	760
	21st to end	Night	28% 14% 32% 22% 3	836

Page generated at 2024-03-15 14:01:39. Version ac07

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