Pickerel Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pickerel Lake clear sky chart from 2005-11-06 to 2024-04-25.

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	11% 8% 3 7% 6% 3 5% 5% 6% 7% 39%	83014
	Night	9% 8% 4 7% 6% 4 5% 5% 6% 7% 39%	86140
Transparency	Day	44% 5% 14% 25% 11% 1	82711
	Night	43% 5% 13% 24% 13% 2	85966
Seeing	Day	15% 11% 32% 28% 12% 2	15199
	Night	13% 10% 36% 31% 9% 1	25303

By Month

Percentage Cloud Cover SW (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	8% 14% 5% 9% 9% 6% 7% 6% 6% 8% 21%	2282
	11th to 20th	Day	4 8% 4 10% 9% 4 8% 12% 10% 11% 21%	2540
	21st to end	Day	5% 10% 5% 17% 11% 4 7% 5% 6% 6% 24%	2949
February	1st to 10th	Day	8% 10% 4 11% 8% 5% 7% 6% 7% 8% 27%	1710
	11th to 20th	Day	7% 8% 5% 11% 8% 5% 7% 7% 6% 7% 29%	1668
	21st to end	Day	7% 11% 4 11% 7% 6% 8% 5% 5% 7% 30%	1570
March	1st to 10th	Day	10% 11% 4 8% 8% 3 4 5% 5% 7% 35%	3248
	11th to 20th	Day	8% 11% 4 7% 6% 3 4 5% 5% 9% 38%	3480
	21st to end	Day	20% 14% 5% 10% 10% 3 3 3 5% 5% 20%	3814
April	1st to 10th	Day	15% 9% 3 5% 5% 2 4 5% 4 7% 39%	2213
	11th to 20th	Day	17% 12% 5% 7% 5% 3 4 3 4 6% 32%	2439
	21st to end	Day	18% 10% 4 6% 5% 3 4 4 5% 6% 35%	2394
May	1st to 10th	Day	15% 10% 4 7% 6% 3 5% 4 5% 6% 35%	2340
	11th to 20th	Day	15% 8% 2 5% 5% 2 5% 4 7% 8% 39%	2363
	21st to end	Day	15% 6% 3 5% 5% 3 5% 6% 6% 9% 38%	2824
June	1st to 10th	Day	11% 5% 2 5% 5% 3 5% 5% 7% 9% 43%	2700
	11th to 20th	Day	12% 6% 2 6% 5% 3 4 6% 5% 9% 42%	2700
	21st to end	Day	8% 4 2 5% 5% 3 5% 5% 7% 8% 48%	2700
July	1st to 10th	Day	6% 4 2 4 4 3 5% 5% 7% 10% 52%	2700
	11th to 20th	Day	5% 2 1 3 4 2 4 4 6% 8% 60%	2622
	21st to end	Day	5% 3 1 5% 4 3 5% 6% 7% 9% 51%	2668
August	1st to 10th	Day	8% 6% 2 4 6% 4 5% 6% 6% 8% 44%	2328
	11th to 20th	Day	11% 4 2 5% 5% 3 5% 5% 6% 8% 47%	2301
	21st to end	Day	9% 4 2 4 4 2 3 4 4 7% 58%	2574
September	1st to 10th	Day	11% 5% 2 4 4 2 4 4 5% 6% 53%	2137
	11th to 20th	Day	10% 5% 2 4 5% 2 5% 4 6% 8% 50%	1980
	21st to end	Day	14% 7% 2 4 4 2 3 4 4 6% 49%	1980
October	1st to 10th	Day	14% 7% 3 7% 4 3 4 4 4 7% 44%	1864
	11th to 20th	Day	14% 8% 4 5% 4 3 4 4 4 6% 45%	1800
	21st to end	Day	13% 10% 4 6% 5% 2 3 4 5% 7% 41%	1829
November	1st to 10th	Day	12% 10% 5% 7% 6% 3 3 3 5% 7% 39%	1669
	11th to 20th	Day	9% 10% 4 10% 9% 4 5% 4 5% 5% 33%	1520
	21st to end	Day	9% 10% 4 8% 8% 4 5% 4 5% 8% 35%	1520
December	1st to 10th	Day	7% 10% 4 10% 10% 5% 7% 7% 6% 6% 28%	1463
	11th to 20th	Day	8% 10% 5% 8% 7% 5% 6% 6% 7% 9% 28%	1683
	21st to end	Day	16% 12% 5% 11% 7% 3 4 4 4 5% 29%	2442
January	1st to 10th	Night	5% 10% 5% 11% 9% 6% 8% 7% 7% 9% 22%	4669
	11th to 20th	Night	4 7% 4 9% 9% 5% 9% 12% 10% 9% 22%	4430
	21st to end	Night	5% 9% 6% 17% 7% 4 5% 5% 6% 7% 29%	4717
February	1st to 10th	Night	6% 9% 5% 9% 8% 5% 8% 8% 6% 7% 30%	2470
	11th to 20th	Night	6% 9% 5% 7% 7% 4 7% 6% 7% 7% 35%	2403
	21st to end	Night	9% 9% 5% 8% 8% 4 5% 6% 6% 7% 34%	1895
March	1st to 10th	Night	7% 8% 4 8% 7% 4 5% 5% 5% 8% 40%	3611
	11th to 20th	Night	8% 8% 3 7% 8% 4 5% 5% 6% 7% 39%	3480
	21st to end	Night	19% 13% 5% 7% 8% 3 4 4 5% 6% 25%	3817
April	1st to 10th	Night	13% 10% 3 6% 4 3 5% 5% 5% 8% 38%	1962
	11th to 20th	Night	17% 8% 4 7% 5% 2 5% 4 4 6% 38%	1689
	21st to end	Night	16% 11% 3 7% 5% 2 6% 3 4 6% 38%	1665
May	1st to 10th	Night	13% 6% 3 6% 6% 3 4 5% 5% 6% 43%	1620
	11th to 20th	Night	12% 7% 3 4 5% 3 5% 5% 6% 8% 43%	1528
	21st to end	Night	11% 7% 3 4 5% 3 5% 5% 7% 9% 40%	1448
June	1st to 10th	Night	10% 4 2 4 3 2 4 6% 7% 9% 48%	1260
	11th to 20th	Night	8% 4 2 5% 5% 3 4 5% 6% 9% 49%	1260
	21st to end	Night	7% 3 2 3 3 2 3 4 5% 7% 60%	1260
July	1st to 10th	Night	5% 3 1 2 3 2 3 5% 6% 9% 60%	1260
	11th to 20th	Night	3 2 1 2 2 2 3 3 5% 9% 68%	1335
	21st to end	Night	4 3 1 3 4 4 3 4 5% 8% 60%	1648
August	1st to 10th	Night	6% 3 2 4 4 3 5% 6% 6% 8% 53%	1611
	11th to 20th	Night	8% 4 2 4 4 2 4 4 4 8% 57%	1600
	21st to end	Night	6% 3 2 3 3 2 3 3 4 7% 66%	1782
September	1st to 10th	Night	9% 3 2 3 4 2 3 4 3 6% 61%	1820
	11th to 20th	Night	8% 5% 2 5% 4 2 3 4 5% 6% 55%	1980
	21st to end	Night	12% 5% 2 4 3 2 3 5% 4 5% 55%	1980
October	1st to 10th	Night	14% 6% 2 5% 4 3 4 5% 5% 6% 46%	2078
	11th to 20th	Night	13% 7% 3 6% 4 3 3 4 4 6% 47%	2160
	21st to end	Night	12% 9% 3 6% 5% 2 4 3 5% 7% 43%	2524
November	1st to 10th	Night	9% 8% 4 6% 6% 3 5% 5% 5% 6% 43%	2407
	11th to 20th	Night	8% 8% 4 9% 8% 4 4 5% 5% 7% 38%	2660
	21st to end	Night	8% 8% 3 7% 8% 4 4 4 6% 8% 40%	2660
December	1st to 10th	Night	6% 10% 5% 9% 8% 5% 6% 6% 6% 8% 31%	2712
	11th to 20th	Night	9% 10% 4 9% 7% 4 7% 6% 6% 7% 31%	3514
	21st to end	Night	15% 13% 6% 11% 8% 3 4 4 4 6% 25%	5225

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	59% 6% 11% 15% 8% 1	2283
	11th to 20th	Day	54% 6% 11% 24% 5%	2540
	21st to end	Day	59% 6% 10% 18% 7%	2949
February	1st to 10th	Day	54% 5% 12% 20% 9% 1	1710
	11th to 20th	Day	51% 5% 12% 21% 8% 2	1677
	21st to end	Day	53% 6% 13% 18% 9% 1	1570
March	1st to 10th	Day	48% 4 12% 27% 8% 1	3248
	11th to 20th	Day	44% 4 12% 30% 9% 2	3480
	21st to end	Day	66% 5% 11% 12% 4 1	3814
April	1st to 10th	Day	44% 5% 12% 24% 13% 1	2213
	11th to 20th	Day	53% 4 10% 20% 13% 1	2442
	21st to end	Day	50% 4 13% 25% 9% 1	2394
May	1st to 10th	Day	49% 4 12% 22% 12% 1	2340
	11th to 20th	Day	42% 5% 15% 26% 11% 1	2367
	21st to end	Day	42% 5% 17% 24% 11% 1	2824
June	1st to 10th	Day	36% 5% 18% 30% 10% 1	2700
	11th to 20th	Day	38% 5% 15% 27% 12% 2	2700
	21st to end	Day	32% 5% 19% 30% 12% 1	2700
July	1st to 10th	Day	26% 5% 18% 33% 17% 1	2626
	11th to 20th	Day	23% 5% 16% 32% 20% 4	2541
	21st to end	Day	28% 5% 17% 29% 18% 2	2520
August	1st to 10th	Day	36% 5% 16% 26% 13% 4	2314
	11th to 20th	Day	33% 5% 16% 33% 11% 2	2301
	21st to end	Day	27% 4 14% 33% 18% 4	2574
September	1st to 10th	Day	31% 5% 13% 34% 16% 1	2137
	11th to 20th	Day	33% 3 19% 33% 11% 1	1980
	21st to end	Day	37% 3 12% 30% 16% 1	1980
October	1st to 10th	Day	41% 3 15% 26% 13% 1	1864
	11th to 20th	Day	41% 4 11% 28% 14% 2	1800
	21st to end	Day	44% 4 14% 26% 12% 1	1829
November	1st to 10th	Day	45% 4 12% 22% 14% 3	1669
	11th to 20th	Day	52% 5% 13% 19% 10% 1	1520
	21st to end	Day	48% 5% 15% 22% 8% 2	1520
December	1st to 10th	Day	55% 7% 13% 16% 8% 1	1463
	11th to 20th	Day	51% 5% 18% 20% 6% 1	1680
	21st to end	Day	60% 3 9% 21% 7% 1	2442
January	1st to 10th	Night	57% 6% 11% 18% 7%	4669
	11th to 20th	Night	52% 7% 14% 18% 9% 1	4430
	21st to end	Night	54% 6% 12% 18% 9% 1	4717
February	1st to 10th	Night	51% 5% 12% 18% 13% 1	2470
	11th to 20th	Night	45% 6% 12% 23% 12% 3	2404
	21st to end	Night	47% 6% 12% 19% 12% 3	1895
March	1st to 10th	Night	43% 3 12% 27% 13% 3	3611
	11th to 20th	Night	42% 5% 12% 29% 12% 1	3480
	21st to end	Night	59% 4 13% 16% 6% 1	3817
April	1st to 10th	Night	43% 5% 11% 27% 12% 1	1962
	11th to 20th	Night	48% 4 7% 25% 14% 2	1689
	21st to end	Night	48% 4 11% 25% 11% 1	1665
May	1st to 10th	Night	41% 4 13% 26% 15% 1	1620
	11th to 20th	Night	38% 7% 13% 25% 16% 2	1529
	21st to end	Night	39% 6% 17% 24% 13% 1	1449
June	1st to 10th	Night	30% 4 19% 31% 14% 2	1260
	11th to 20th	Night	31% 5% 19% 26% 15% 3	1260
	21st to end	Night	23% 4 20% 31% 19% 2	1260
July	1st to 10th	Night	20% 5% 19% 35% 19% 2	1225
	11th to 20th	Night	16% 4 15% 36% 25% 4	1293
	21st to end	Night	21% 4 17% 33% 19% 5%	1556
August	1st to 10th	Night	29% 5% 17% 31% 15% 4	1601
	11th to 20th	Night	27% 5% 17% 34% 15% 2	1600
	21st to end	Night	20% 3 13% 36% 24% 4	1782
September	1st to 10th	Night	26% 3 14% 33% 22% 2	1820
	11th to 20th	Night	31% 4 14% 31% 18% 1	1980
	21st to end	Night	32% 4 12% 30% 20% 2	1980
October	1st to 10th	Night	39% 4 13% 25% 17% 2	2078
	11th to 20th	Night	39% 3 11% 28% 17% 3	2160
	21st to end	Night	41% 4 12% 28% 13% 2	2524
November	1st to 10th	Night	41% 5% 12% 21% 18% 3	2407
	11th to 20th	Night	46% 5% 14% 19% 13% 2	2660
	21st to end	Night	43% 5% 16% 24% 11% 1	2660
December	1st to 10th	Night	50% 7% 16% 19% 9%	2712
	11th to 20th	Night	50% 5% 19% 19% 6% 1	3516
	21st to end	Night	61% 4 9% 17% 9%	5225

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	15% 14% 33% 30% 6% 1	270
	11th to 20th	Day	10% 16% 41% 28% 6%	270
	21st to end	Day	13% 13% 41% 23% 10%	297
February	1st to 10th	Day	11% 16% 42% 27% 3	270
	11th to 20th	Day	14% 16% 44% 18% 7% 1	270
	21st to end	Day	13% 13% 48% 22% 3	225
March	1st to 10th	Day	17% 17% 37% 24% 4 1	270
	11th to 20th	Day	13% 13% 37% 26% 8% 2	270
	21st to end	Day	20% 12% 28% 26% 11% 3	297
April	1st to 10th	Day	24% 17% 31% 23% 6%	393
	11th to 20th	Day	27% 16% 29% 19% 8% 1	640
	21st to end	Day	21% 11% 34% 23% 10% 2	622
May	1st to 10th	Day	19% 10% 33% 28% 9% 1	603
	11th to 20th	Day	20% 10% 27% 28% 13% 2	625
	21st to end	Day	18% 8% 29% 32% 11% 3	679
June	1st to 10th	Day	9% 9% 25% 33% 21% 3	630
	11th to 20th	Day	14% 9% 37% 26% 11% 3	630
	21st to end	Day	12% 7% 31% 34% 14% 2	630
July	1st to 10th	Day	7% 4 27% 35% 22% 5%	621
	11th to 20th	Day	6% 7% 32% 35% 16% 3	618
	21st to end	Day	5% 5% 27% 39% 20% 4	684
August	1st to 10th	Day	9% 4 23% 39% 21% 3	626
	11th to 20th	Day	12% 5% 27% 33% 19% 4	615
	21st to end	Day	10% 6% 26% 34% 21% 3	693
September	1st to 10th	Day	13% 9% 29% 32% 14% 2	427
	11th to 20th	Day	11% 6% 36% 31% 13% 3	270
	21st to end	Day	21% 16% 29% 22% 11% 1	270
October	1st to 10th	Day	19% 11% 30% 26% 11% 2	270
	11th to 20th	Day	15% 18% 34% 26% 6% 1	270
	21st to end	Day	19% 23% 35% 16% 7% 1	297
November	1st to 10th	Day	21% 13% 33% 27% 5% 1	270
	11th to 20th	Day	17% 19% 38% 21% 4 1	270
	21st to end	Day	14% 21% 36% 23% 4 1	270
December	1st to 10th	Day	14% 14% 44% 19% 8% 1	270
	11th to 20th	Day	12% 18% 42% 24% 3	270
	21st to end	Day	24% 14% 37% 20% 4 1	297
January	1st to 10th	Night	11% 14% 43% 26% 5% 1	950
	11th to 20th	Night	11% 13% 43% 29% 4 1	950
	21st to end	Night	12% 13% 44% 26% 5%	1045
February	1st to 10th	Night	11% 12% 42% 29% 5% 1	950
	11th to 20th	Night	10% 13% 45% 25% 6% 1	929
	21st to end	Night	13% 10% 40% 26% 10% 2	639
March	1st to 10th	Night	12% 12% 42% 26% 7% 1	689
	11th to 20th	Night	15% 11% 39% 27% 7%	570
	21st to end	Night	15% 10% 31% 30% 11% 1	627
April	1st to 10th	Night	17% 11% 38% 28% 6%	570
	11th to 20th	Night	20% 13% 30% 26% 10% 1	563
	21st to end	Night	21% 9% 33% 26% 10% 1	555
May	1st to 10th	Night	15% 11% 32% 33% 8% 1	540
	11th to 20th	Night	15% 7% 33% 35% 10%	531
	21st to end	Night	14% 6% 32% 35% 12% 1	584
June	1st to 10th	Night	11% 7% 26% 38% 18% 1	540
	11th to 20th	Night	9% 8% 34% 41% 8%	540
	21st to end	Night	8% 6% 29% 44% 13% 1	540
July	1st to 10th	Night	6% 3 25% 44% 21% 2	525
	11th to 20th	Night	4 3 30% 47% 15% 1	522
	21st to end	Night	4 2 27% 50% 17% 1	591
August	1st to 10th	Night	7% 2 23% 50% 16% 2	537
	11th to 20th	Night	10% 3 23% 42% 18% 3	534
	21st to end	Night	6% 4 31% 40% 18% 1	594
September	1st to 10th	Night	9% 6% 32% 37% 14% 2	540
	11th to 20th	Night	9% 9% 31% 35% 14% 2	540
	21st to end	Night	14% 9% 36% 29% 12% 1	540
October	1st to 10th	Night	16% 13% 30% 32% 9% 1	638
	11th to 20th	Night	18% 16% 35% 24% 8%	720
	21st to end	Night	19% 14% 36% 26% 5%	940
November	1st to 10th	Night	13% 13% 39% 28% 7%	925
	11th to 20th	Night	12% 13% 40% 26% 7% 1	950
	21st to end	Night	12% 14% 44% 26% 4	950
December	1st to 10th	Night	11% 13% 44% 24% 7%	950
	11th to 20th	Night	16% 13% 40% 26% 4 1	950
	21st to end	Night	20% 13% 41% 22% 5%	1045

Page generated at 2024-04-22 08:25:42. Version ac07

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