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 2024-11-03.

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% 9% 3 7% 5% 4 4 4 5% 8% 36%	101729
	Night	15% 9% 3 7% 4 4 4 3 5% 7% 38%	97227
Transparency	Day	45% 7% 12% 22% 13% 1	101535
	Night	45% 7% 11% 22% 14% 2	97092
Seeing	Day	17% 11% 26% 23% 16% 7%	15251
	Night	18% 9% 27% 29% 15% 2	24762

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	16% 17% 6% 11% 4 4 4 3 4 6% 25%	2836
	11th to 20th	Day	16% 14% 5% 14% 6% 9% 5% 3 3 4 20%	2840
	21st to end	Day	28% 16% 9% 8% 4 3 3 2 3 5% 17%	3124
February	1st to 10th	Day	19% 13% 5% 9% 5% 4 4 3 4 5% 27%	1786
	11th to 20th	Day	16% 11% 5% 11% 5% 5% 4 4 4 5% 30%	1848
	21st to end	Day	18% 15% 5% 9% 4 4 3 2 4 6% 30%	1570
March	1st to 10th	Day	22% 17% 4 9% 4 4 3 3 4 5% 26%	3176
	11th to 20th	Day	14% 8% 3 7% 5% 4 4 4 5% 7% 40%	3480
	21st to end	Day	18% 9% 3 7% 5% 4 4 3 5% 7% 35%	3815
April	1st to 10th	Day	15% 8% 4 7% 5% 5% 4 4 6% 7% 35%	2213
	11th to 20th	Day	16% 8% 2 7% 4 4 4 4 5% 6% 39%	2323
	21st to end	Day	18% 8% 3 7% 5% 4 5% 4 5% 7% 35%	2470
May	1st to 10th	Day	22% 9% 3 7% 5% 4 4 4 5% 7% 30%	4082
	11th to 20th	Day	20% 8% 3 7% 4 4 3 3 5% 7% 35%	4081
	21st to end	Day	10% 6% 2 7% 6% 5% 6% 5% 7% 9% 35%	4476
June	1st to 10th	Day	12% 6% 2 6% 5% 5% 6% 5% 7% 9% 39%	2470
	11th to 20th	Day	9% 6% 2 7% 4 5% 5% 4 6% 10% 43%	2592
	21st to end	Day	9% 6% 2 6% 5% 5% 5% 4 7% 10% 41%	2660
July	1st to 10th	Day	12% 6% 3 7% 5% 5% 5% 4 7% 9% 38%	4440
	11th to 20th	Day	7% 5% 2 6% 4 4 5% 4 7% 12% 45%	4184
	21st to end	Day	11% 7% 3 8% 6% 6% 6% 5% 7% 9% 31%	4466
August	1st to 10th	Day	8% 6% 2 5% 4 4 5% 4 7% 10% 44%	4104
	11th to 20th	Day	7% 7% 2 6% 4 5% 6% 5% 7% 10% 41%	4044
	21st to end	Day	6% 4 2 5% 3 4 4 3 5% 9% 55%	4255
September	1st to 10th	Day	12% 5% 2 6% 4 4 4 3 5% 7% 49%	2145
	11th to 20th	Day	9% 5% 2 5% 3 4 4 4 7% 9% 48%	2090
	21st to end	Day	16% 6% 2 6% 4 4 3 2 5% 6% 46%	2090
October	1st to 10th	Day	11% 5% 2 5% 4 4 5% 4 5% 6% 50%	2090
	11th to 20th	Day	14% 7% 2 6% 4 4 5% 2 5% 7% 46%	1911
	21st to end	Day	19% 9% 3 6% 4 3 3 3 4 7% 39%	1971
November	1st to 10th	Day	9% 7% 2 5% 3 3 3 3 5% 6% 52%	1690
	11th to 20th	Day	14% 11% 4 7% 5% 4 4 4 4 5% 37%	1710
	21st to end	Day	17% 11% 4 7% 4 5% 3 3 4 6% 36%	1710
December	1st to 10th	Day	20% 14% 5% 10% 6% 4 5% 3 4 5% 24%	1710
	11th to 20th	Day	16% 13% 5% 10% 5% 4 4 4 5% 5% 28%	2153
	21st to end	Day	21% 21% 5% 10% 5% 4 4 4 4 6% 17%	3124
January	1st to 10th	Night	15% 17% 7% 12% 6% 4 4 4 5% 5% 21%	4109
	11th to 20th	Night	16% 16% 5% 14% 7% 5% 3 3 4 5% 22%	4120
	21st to end	Night	25% 18% 7% 8% 4 4 3 2 4 5% 21%	4532
February	1st to 10th	Night	21% 13% 4 7% 5% 4 4 3 5% 4 29%	2390
	11th to 20th	Night	17% 11% 4 8% 5% 5% 4 3 5% 6% 31%	2218
	21st to end	Night	20% 14% 5% 8% 4 4 3 2 4 6% 30%	1884
March	1st to 10th	Night	21% 13% 3 6% 4 4 3 3 4 6% 33%	3677
	11th to 20th	Night	13% 7% 2 6% 4 4 4 3 6% 7% 43%	3480
	21st to end	Night	18% 8% 3 7% 5% 4 4 3 5% 5% 39%	3817
April	1st to 10th	Night	15% 9% 3 6% 4 4 4 4 6% 6% 38%	1983
	11th to 20th	Night	14% 8% 2 5% 4 4 4 4 6% 7% 41%	1804
	21st to end	Night	17% 7% 3 6% 4 5% 4 4 6% 7% 38%	1710
May	1st to 10th	Night	22% 11% 4 8% 5% 4 4 4 5% 6% 26%	2813
	11th to 20th	Night	18% 6% 2 6% 4 4 4 4 6% 7% 39%	2812
	21st to end	Night	9% 5% 2 5% 4 4 4 5% 6% 10% 46%	3079
June	1st to 10th	Night	8% 5% 2 5% 5% 4 4 4 6% 8% 49%	1710
	11th to 20th	Night	8% 4 1 5% 4 3 5% 4 7% 12% 48%	1580
	21st to end	Night	7% 3 1 5% 4 5% 5% 6% 7% 10% 47%	1520
July	1st to 10th	Night	10% 5% 2 6% 3 4 4 3 5% 8% 50%	2530
	11th to 20th	Night	6% 5% 2 5% 4 4 5% 4 6% 10% 50%	2773
	21st to end	Night	11% 6% 3 8% 5% 5% 5% 4 6% 9% 38%	3087
August	1st to 10th	Night	8% 7% 3 7% 4 4 5% 4 6% 8% 44%	2825
	11th to 20th	Night	8% 7% 3 8% 4 4 4 3 6% 8% 46%	2785
	21st to end	Night	4 2 1 4 3 4 4 4 7% 10% 58%	3398
September	1st to 10th	Night	11% 5% 2 5% 4 3 4 3 5% 7% 52%	2015
	11th to 20th	Night	8% 5% 2 5% 4 3 4 4 5% 7% 54%	2090
	21st to end	Night	14% 6% 2 5% 4 4 3 3 3 6% 49%	2090
October	1st to 10th	Night	9% 4 2 6% 3 4 3 3 5% 6% 55%	2090
	11th to 20th	Night	14% 7% 2 6% 4 4 4 4 5% 7% 45%	2267
	21st to end	Night	18% 8% 3 5% 4 4 3 3 5% 6% 41%	2622
November	1st to 10th	Night	14% 7% 2 5% 4 4 3 3 5% 6% 47%	2433
	11th to 20th	Night	15% 8% 3 7% 4 4 3 3 5% 7% 40%	2470
	21st to end	Night	18% 13% 3 7% 5% 4 4 3 5% 6% 33%	2470
December	1st to 10th	Night	20% 12% 5% 9% 5% 4 4 3 5% 6% 28%	2470
	11th to 20th	Night	18% 13% 6% 8% 5% 4 3 3 5% 6% 29%	3042
	21st to end	Night	19% 18% 7% 11% 6% 5% 4 3 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	59% 6% 9% 18% 7% 1	3176
	11th to 20th	Day	41% 7% 11% 25% 15% 1	3480
	21st to end	Day	47% 7% 12% 23% 11% 1	3815
April	1st to 10th	Day	46% 8% 11% 23% 12% 1	2213
	11th to 20th	Day	44% 7% 11% 22% 14% 3	2323
	21st to end	Day	48% 7% 11% 21% 11% 2	2470
May	1st to 10th	Day	51% 8% 13% 20% 7% 1	4120
	11th to 20th	Day	47% 8% 13% 21% 11% 1	4085
	21st to end	Day	38% 13% 14% 19% 15% 2	4489
June	1st to 10th	Day	38% 10% 12% 23% 15% 2	2470
	11th to 20th	Day	35% 9% 14% 24% 17% 1	2592
	21st to end	Day	37% 9% 15% 21% 14% 4	2660
July	1st to 10th	Day	41% 7% 12% 21% 18% 2	4371
	11th to 20th	Day	30% 7% 12% 32% 17% 1	4113
	21st to end	Day	46% 8% 13% 17% 12% 3	4324
August	1st to 10th	Day	33% 9% 16% 32% 10% 1	4091
	11th to 20th	Day	35% 7% 12% 31% 15%	4083
	21st to end	Day	26% 7% 14% 29% 20% 3	4254
September	1st to 10th	Day	34% 6% 11% 23% 20% 5%	2145
	11th to 20th	Day	31% 7% 13% 24% 22% 3	2090
	21st to end	Day	39% 6% 10% 23% 21% 2	2090
October	1st to 10th	Day	33% 8% 10% 25% 22% 2	2090
	11th to 20th	Day	38% 5% 8% 27% 19% 3	1911
	21st to end	Day	46% 5% 12% 20% 16% 2	1971
November	1st to 10th	Day	33% 5% 11% 28% 21% 3	1690
	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	52% 6% 8% 22% 11% 1	3677
	11th to 20th	Night	38% 8% 14% 25% 14% 1	3480
	21st to end	Night	45% 7% 9% 27% 11% 1	3817
April	1st to 10th	Night	44% 8% 11% 23% 12% 3	1983
	11th to 20th	Night	40% 7% 11% 18% 18% 5%	1804
	21st to end	Night	44% 8% 11% 21% 14% 3	1710
May	1st to 10th	Night	55% 9% 9% 17% 8% 2	2840
	11th to 20th	Night	41% 9% 15% 24% 9% 1	2813
	21st to end	Night	30% 10% 17% 25% 14% 4	3087
June	1st to 10th	Night	31% 8% 12% 26% 20% 3	1710
	11th to 20th	Night	27% 10% 17% 22% 20% 4	1580
	21st to end	Night	28% 11% 17% 22% 16% 5%	1520
July	1st to 10th	Night	33% 7% 11% 24% 19% 5%	2490
	11th to 20th	Night	28% 7% 13% 31% 19% 2	2722
	21st to end	Night	41% 6% 13% 21% 14% 4	2988
August	1st to 10th	Night	35% 8% 14% 31% 12% 1	2814
	11th to 20th	Night	36% 7% 12% 26% 18% 1	2812
	21st to end	Night	20% 7% 16% 32% 22% 3	3398
September	1st to 10th	Night	31% 7% 12% 24% 18% 7%	2015
	11th to 20th	Night	28% 8% 11% 23% 28% 3	2090
	21st to end	Night	37% 5% 10% 21% 25% 2	2090
October	1st to 10th	Night	29% 5% 12% 26% 24% 3	2090
	11th to 20th	Night	37% 6% 10% 25% 21% 2	2267
	21st to end	Night	43% 5% 10% 22% 17% 3	2622
November	1st to 10th	Night	38% 5% 10% 21% 22% 4	2433
	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% 17% 37% 17% 5%	460
	21st to end	Day	29% 19% 30% 18% 6%	506
April	1st to 10th	Day	19% 19% 29% 22% 9% 1	460
	11th to 20th	Day	22% 19% 25% 21% 12% 3	452
	21st to end	Day	22% 15% 35% 17% 9% 2	460
May	1st to 10th	Day	23% 13% 32% 19% 8% 4	463
	11th to 20th	Day	21% 9% 25% 25% 14% 6%	487
	21st to end	Day	14% 5% 26% 27% 19% 9%	529
June	1st to 10th	Day	12% 7% 22% 30% 21% 8%	490
	11th to 20th	Day	11% 5% 21% 33% 24% 7%	612
	21st to end	Day	11% 4 24% 32% 20% 9%	680
July	1st to 10th	Day	13% 4 17% 25% 22% 19%	671
	11th to 20th	Day	9% 3 20% 29% 26% 12%	520
	21st to end	Day	11% 3 16% 30% 26% 14%	532
August	1st to 10th	Day	12% 3 12% 27% 30% 15%	486
	11th to 20th	Day	11% 4 20% 30% 23% 12%	479
	21st to end	Day	8% 4 13% 28% 30% 16%	539
September	1st to 10th	Day	11% 3 18% 28% 29% 12%	490
	11th to 20th	Day	11% 3 15% 25% 32% 14%	490
	21st to end	Day	19% 8% 20% 24% 21% 7%	490
October	1st to 10th	Day	9% 6% 24% 33% 20% 8%	490
	11th to 20th	Day	16% 14% 31% 21% 13% 4	490
	21st to end	Day	21% 14% 34% 23% 7%	420
November	1st to 10th	Day	16% 11% 33% 25% 12% 3	276
	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	760
	21st to end	Night	24% 9% 33% 27% 7%	836
April	1st to 10th	Night	19% 14% 34% 26% 7%	653
	11th to 20th	Night	17% 11% 32% 27% 12% 1	563
	21st to end	Night	18% 8% 38% 27% 7% 1	570
May	1st to 10th	Night	21% 8% 31% 27% 11% 1	570
	11th to 20th	Night	17% 4 25% 34% 18% 2	561
	21st to end	Night	9% 2 23% 37% 24% 6%	617
June	1st to 10th	Night	9% 3 21% 42% 24% 1	570
	11th to 20th	Night	10% 3 14% 43% 27% 3	570
	21st to end	Night	7% 2 20% 43% 26% 2	570
July	1st to 10th	Night	12% 2 13% 32% 32% 10%	555
	11th to 20th	Night	7% 2 13% 37% 36% 4	552
	21st to end	Night	11% 2 11% 40% 33% 4	624
August	1st to 10th	Night	9% 2 10% 40% 35% 4	567
	11th to 20th	Night	10% 1 12% 43% 29% 5%	564
	21st to end	Night	7% 1 13% 34% 37% 8%	627
September	1st to 10th	Night	14% 1 14% 32% 33% 5%	685
	11th to 20th	Night	10% 2 15% 35% 33% 6%	760
	21st to end	Night	16% 5% 22% 32% 24% 2	760
October	1st to 10th	Night	11% 4 22% 36% 23% 3	760
	11th to 20th	Night	17% 9% 27% 32% 14% 1	760
	21st to end	Night	22% 8% 32% 27% 11%	836
November	1st to 10th	Night	17% 8% 30% 28% 15% 1	749
	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 2024-10-31 03:39:27. Version ac07

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