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 2024-11-05.

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 8% 5% 4 4 4 6% 7% 40%	105297
	Night	9% 8% 3 8% 5% 5% 5% 4 6% 7% 41%	102377
Transparency	Day	42% 5% 13% 27% 12% 1	105033
	Night	42% 5% 13% 25% 14% 2	102231
Seeing	Day	15% 11% 32% 28% 12% 2	16045
	Night	13% 10% 36% 31% 9% 1	25931

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% 15% 4 10% 7% 7% 8% 4 7% 8% 21%	2282
	11th to 20th	Day	4 9% 4 11% 7% 5% 9% 10% 10% 11% 21%	2540
	21st to end	Day	5% 10% 5% 19% 9% 6% 6% 4 6% 6% 24%	2949
February	1st to 10th	Day	8% 11% 4 13% 6% 7% 6% 5% 7% 8% 27%	1710
	11th to 20th	Day	7% 9% 5% 12% 7% 7% 7% 6% 6% 7% 29%	1668
	21st to end	Day	7% 12% 3 12% 6% 8% 6% 4 5% 7% 30%	1570
March	1st to 10th	Day	9% 12% 4 10% 6% 4 4 4 5% 7% 35%	3248
	11th to 20th	Day	8% 12% 3 8% 5% 4 4 4 5% 9% 38%	3480
	21st to end	Day	20% 15% 5% 13% 7% 4 3 2 5% 5% 20%	3814
April	1st to 10th	Day	15% 10% 3 6% 5% 3 4 4 4 7% 39%	2213
	11th to 20th	Day	17% 13% 4 8% 4 4 4 3 5% 6% 32%	2439
	21st to end	Day	18% 11% 4 7% 5% 4 4 3 5% 6% 34%	2470
May	1st to 10th	Day	14% 9% 3 7% 4 4 4 3 5% 7% 40%	4120
	11th to 20th	Day	13% 7% 2 6% 4 3 4 3 6% 7% 45%	4199
	21st to end	Day	16% 6% 2 6% 4 4 4 5% 6% 8% 37%	5014
June	1st to 10th	Day	11% 6% 2 6% 4 4 4 4 7% 8% 44%	2850
	11th to 20th	Day	13% 6% 2 6% 5% 4 4 5% 5% 9% 41%	2850
	21st to end	Day	9% 5% 2 6% 4 4 4 3 7% 8% 47%	2850
July	1st to 10th	Day	10% 5% 2 5% 4 4 5% 4 7% 9% 44%	4750
	11th to 20th	Day	4 2 1 4 3 3 4 3 6% 8% 62%	4602
	21st to end	Day	5% 3 2 6% 5% 5% 5% 5% 7% 10% 48%	4666
August	1st to 10th	Day	12% 6% 2 5% 4 4 4 4 6% 8% 46%	4103
	11th to 20th	Day	14% 6% 2 6% 4 5% 4 4 6% 9% 39%	4041
	21st to end	Day	11% 4 2 5% 4 3 4 3 5% 7% 52%	4532
September	1st to 10th	Day	10% 5% 2 5% 3 3 4 3 5% 7% 54%	2255
	11th to 20th	Day	9% 5% 2 5% 3 3 4 3 6% 8% 50%	2090
	21st to end	Day	13% 7% 2 5% 3 3 3 3 4 6% 51%	2090
October	1st to 10th	Day	12% 5% 2 5% 3 3 3 2 4 6% 56%	3266
	11th to 20th	Day	11% 7% 3 6% 4 4 3 3 3 5% 50%	3140
	21st to end	Day	12% 10% 3 7% 4 3 4 3 6% 6% 41%	3163
November	1st to 10th	Day	11% 10% 5% 8% 5% 4 3 3 6% 7% 38%	1705
	11th to 20th	Day	9% 11% 4 12% 7% 5% 4 4 5% 6% 33%	1520
	21st to end	Day	8% 11% 3 10% 7% 5% 5% 3 5% 8% 35%	1520
December	1st to 10th	Day	7% 11% 4 12% 8% 6% 6% 5% 7% 6% 28%	1463
	11th to 20th	Day	8% 11% 4 10% 7% 6% 6% 5% 7% 9% 28%	1683
	21st to end	Day	16% 13% 5% 12% 6% 4 4 3 4 5% 29%	2442
January	1st to 10th	Night	5% 11% 5% 12% 8% 8% 8% 6% 7% 9% 22%	4669
	11th to 20th	Night	4 8% 4 10% 8% 7% 9% 10% 10% 9% 22%	4430
	21st to end	Night	5% 10% 5% 19% 6% 5% 5% 4 6% 7% 29%	4717
February	1st to 10th	Night	6% 10% 4 10% 7% 7% 7% 6% 6% 7% 30%	2470
	11th to 20th	Night	6% 10% 4 8% 7% 5% 6% 5% 7% 7% 35%	2403
	21st to end	Night	8% 10% 4 9% 7% 4 5% 5% 6% 7% 34%	1895
March	1st to 10th	Night	7% 8% 3 9% 6% 5% 5% 4 5% 7% 40%	3611
	11th to 20th	Night	8% 9% 3 8% 7% 4 5% 4 6% 7% 39%	3480
	21st to end	Night	19% 14% 4 8% 7% 4 4 3 5% 6% 25%	3817
April	1st to 10th	Night	12% 10% 3 7% 4 4 6% 4 5% 7% 38%	1962
	11th to 20th	Night	17% 9% 3 8% 5% 4 4 3 4 6% 37%	1689
	21st to end	Night	17% 12% 3 7% 4 3 5% 3 4 6% 37%	1710
May	1st to 10th	Night	16% 6% 2 5% 3 3 3 3 5% 7% 48%	2850
	11th to 20th	Night	9% 6% 2 5% 5% 4 5% 4 6% 7% 46%	2702
	21st to end	Night	11% 7% 2 6% 5% 4 5% 4 6% 8% 42%	2569
June	1st to 10th	Night	10% 5% 2 4 3 3 4 5% 8% 9% 48%	1330
	11th to 20th	Night	9% 5% 1 6% 5% 4 4 4 6% 8% 48%	1330
	21st to end	Night	8% 3 2 3 2 3 3 4 5% 7% 60%	1330
July	1st to 10th	Night	9% 5% 2 6% 5% 4 4 4 7% 10% 46%	2220
	11th to 20th	Night	2 2 1 3 2 2 3 2 4 6% 71%	2365
	21st to end	Night	3 3 1 5% 4 4 5% 4 7% 10% 52%	2882
August	1st to 10th	Night	8% 7% 2 5% 3 4 4 4 5% 7% 53%	2836
	11th to 20th	Night	10% 7% 2 6% 4 4 4 3 5% 8% 49%	2798
	21st to end	Night	9% 5% 2 6% 3 4 4 3 5% 7% 53%	3135
September	1st to 10th	Night	9% 3 1 3 3 3 3 3 3 6% 62%	1922
	11th to 20th	Night	7% 6% 2 5% 4 3 3 3 5% 6% 55%	2090
	21st to end	Night	11% 5% 2 4 3 3 3 3 4 5% 56%	2090
October	1st to 10th	Night	8% 4 1 3 2 3 3 3 4 5% 64%	3662
	11th to 20th	Night	9% 6% 2 5% 3 4 4 4 6% 7% 49%	3779
	21st to end	Night	12% 9% 3 6% 4 3 3 3 5% 6% 46%	4391
November	1st to 10th	Night	9% 9% 3 7% 5% 4 5% 4 5% 6% 43%	2472
	11th to 20th	Night	8% 9% 4 11% 6% 5% 4 4 5% 6% 38%	2660
	21st to end	Night	8% 9% 3 9% 7% 4 4 3 6% 8% 39%	2660
December	1st to 10th	Night	6% 11% 5% 10% 7% 6% 5% 5% 6% 8% 31%	2712
	11th to 20th	Night	8% 11% 4 10% 6% 6% 6% 4 7% 7% 30%	3514
	21st to end	Night	15% 14% 5% 13% 6% 5% 4 3 5% 5% 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	51% 3 12% 24% 9%	2470
May	1st to 10th	Day	43% 5% 9% 27% 15% 1	4120
	11th to 20th	Day	37% 5% 11% 31% 12% 3	4203
	21st to end	Day	42% 6% 14% 28% 10%	5014
June	1st to 10th	Day	35% 5% 18% 30% 11% 1	2850
	11th to 20th	Day	39% 5% 15% 26% 12% 2	2850
	21st to end	Day	33% 5% 18% 30% 13% 1	2850
July	1st to 10th	Day	34% 7% 19% 27% 13% 1	4676
	11th to 20th	Day	21% 4 15% 39% 19% 2	4521
	21st to end	Day	29% 7% 17% 30% 15% 1	4518
August	1st to 10th	Day	35% 4 13% 31% 14% 3	4090
	11th to 20th	Day	41% 6% 15% 31% 7% 1	4080
	21st to end	Day	32% 5% 16% 30% 14% 2	4531
September	1st to 10th	Day	30% 5% 13% 36% 16% 1	2255
	11th to 20th	Day	32% 3 19% 34% 11% 1	2090
	21st to end	Day	35% 3 12% 31% 17% 2	2090
October	1st to 10th	Day	31% 2 9% 30% 25% 2	3266
	11th to 20th	Day	38% 4 8% 29% 20% 3	3140
	21st to end	Day	43% 4 14% 23% 15%	3163
November	1st to 10th	Day	45% 4 12% 22% 14% 3	1705
	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	49% 4 11% 25% 11% 1	1710
May	1st to 10th	Night	37% 4 12% 28% 15% 4	2850
	11th to 20th	Night	34% 6% 11% 28% 19% 1	2703
	21st to end	Night	39% 5% 16% 30% 10%	2570
June	1st to 10th	Night	30% 4 18% 30% 15% 2	1330
	11th to 20th	Night	32% 5% 18% 25% 16% 3	1330
	21st to end	Night	24% 4 20% 32% 19% 2	1330
July	1st to 10th	Night	33% 8% 20% 23% 15% 1	2185
	11th to 20th	Night	15% 3 12% 46% 21% 2	2323
	21st to end	Night	26% 7% 19% 30% 16% 3	2791
August	1st to 10th	Night	32% 4 15% 29% 16% 4	2826
	11th to 20th	Night	35% 6% 16% 31% 11% 1	2825
	21st to end	Night	31% 6% 14% 29% 18% 2	3135
September	1st to 10th	Night	26% 3 14% 35% 21% 1	1922
	11th to 20th	Night	31% 4 15% 32% 18% 1	2090
	21st to end	Night	30% 4 12% 31% 20% 3	2090
October	1st to 10th	Night	24% 3 8% 30% 31% 3	3662
	11th to 20th	Night	34% 3 11% 28% 22% 2	3779
	21st to end	Night	40% 3 12% 28% 15% 1	4391
November	1st to 10th	Night	41% 5% 12% 21% 18% 4	2472
	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	22% 12% 33% 22% 10% 2	650
May	1st to 10th	Day	19% 11% 33% 27% 9% 1	653
	11th to 20th	Day	20% 11% 26% 28% 13% 2	675
	21st to end	Day	18% 8% 29% 31% 11% 3	734
June	1st to 10th	Day	9% 8% 27% 33% 20% 3	680
	11th to 20th	Day	16% 9% 38% 25% 11% 2	680
	21st to end	Day	13% 7% 31% 33% 14% 2	680
July	1st to 10th	Day	7% 5% 27% 34% 21% 5%	671
	11th to 20th	Day	6% 6% 31% 35% 17% 4	668
	21st to end	Day	5% 5% 27% 38% 21% 4	739
August	1st to 10th	Day	10% 4 24% 38% 20% 3	676
	11th to 20th	Day	13% 5% 27% 33% 18% 4	665
	21st to end	Day	10% 6% 27% 33% 20% 3	748
September	1st to 10th	Day	12% 9% 29% 31% 16% 2	465
	11th to 20th	Day	11% 7% 38% 30% 13% 2	300
	21st to end	Day	19% 16% 27% 24% 11% 3	300
October	1st to 10th	Day	19% 11% 29% 26% 12% 2	300
	11th to 20th	Day	15% 18% 35% 26% 5% 1	300
	21st to end	Day	18% 21% 37% 16% 7% 1	330
November	1st to 10th	Day	21% 14% 33% 26% 5% 1	282
	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% 10% 32% 26% 10% 1	570
May	1st to 10th	Night	16% 11% 32% 32% 8% 1	570
	11th to 20th	Night	14% 7% 33% 34% 11%	561
	21st to end	Night	14% 6% 33% 34% 12% 1	617
June	1st to 10th	Night	11% 7% 27% 38% 17% 1	570
	11th to 20th	Night	10% 7% 34% 41% 8%	570
	21st to end	Night	9% 5% 29% 44% 12% 1	570
July	1st to 10th	Night	6% 3 25% 43% 21% 3	555
	11th to 20th	Night	4 3 29% 48% 16% 1	552
	21st to end	Night	4 3 27% 49% 17% 1	624
August	1st to 10th	Night	7% 2 24% 49% 16% 2	567
	11th to 20th	Night	10% 3 24% 42% 18% 3	564
	21st to end	Night	7% 4 31% 40% 17% 1	627
September	1st to 10th	Night	9% 6% 31% 37% 15% 2	570
	11th to 20th	Night	8% 9% 33% 34% 14% 2	570
	21st to end	Night	13% 8% 35% 29% 13% 1	570
October	1st to 10th	Night	16% 13% 30% 32% 9% 1	674
	11th to 20th	Night	17% 16% 35% 24% 7%	760
	21st to end	Night	19% 14% 36% 25% 5%	993
November	1st to 10th	Night	13% 13% 39% 28% 7%	950
	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 2024-11-03 01:11:24. Version ac07

Copyright © 2024 Attilla Danko.