Pickle Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pickle Lake clear sky chart from 2005-11-06 to 2026-07-01.

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	13% 12% 4 10% 6% 5% 5% 4 5% 6% 29%	137962
	Night	11% 13% 5% 12% 7% 6% 6% 4 5% 5% 25%	134701
Transparency	Day	55% 5% 11% 21% 9% 1	141333
	Night	60% 4 10% 18% 7% 1	139416
Seeing	Day	21% 15% 33% 22% 8% 2	18142
	Night	20% 11% 33% 26% 9% 1	27634

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	6% 14% 6% 19% 9% 9% 10% 6% 6% 5% 11%	3983
	11th to 20th	Day	5% 12% 6% 21% 10% 9% 10% 8% 9% 4 7%	4199
	21st to end	Day	6% 14% 5% 16% 8% 9% 9% 6% 8% 7% 12%	5156
February	1st to 10th	Day	5% 14% 5% 12% 8% 9% 10% 8% 7% 6% 17%	1720
	11th to 20th	Day	5% 11% 6% 12% 8% 7% 8% 8% 7% 7% 20%	1844
	21st to end	Day	3 12% 5% 15% 8% 6% 7% 5% 8% 7% 24%	1652
March	1st to 10th	Day	9% 15% 7% 16% 8% 5% 4 3 4 4 26%	4578
	11th to 20th	Day	9% 14% 6% 13% 7% 7% 6% 4 5% 5% 25%	4938
	21st to end	Day	8% 16% 6% 10% 5% 7% 7% 4 5% 6% 25%	5996
April	1st to 10th	Day	11% 12% 4 11% 6% 5% 4 3 5% 6% 33%	2520
	11th to 20th	Day	15% 14% 4 9% 5% 5% 4 3 4 5% 33%	2535
	21st to end	Day	14% 12% 4 8% 5% 3 5% 3 5% 7% 34%	2940
May	1st to 10th	Day	13% 16% 5% 8% 5% 4 4 3 4 5% 32%	8241
	11th to 20th	Day	20% 13% 4 8% 4 3 3 3 4 5% 32%	8222
	21st to end	Day	16% 6% 2 5% 3 4 4 4 5% 7% 44%	9529
June	1st to 10th	Day	21% 9% 3 8% 6% 4 5% 4 6% 7% 28%	3360
	11th to 20th	Day	17% 8% 3 7% 5% 5% 5% 4 5% 8% 33%	3360
	21st to end	Day	16% 8% 3 7% 6% 5% 5% 4 5% 8% 32%	3360
July	1st to 10th	Day	12% 6% 2 7% 5% 5% 5% 4 6% 8% 40%	7182
	11th to 20th	Day	16% 7% 2 6% 5% 5% 5% 4 7% 8% 36%	6800
	21st to end	Day	12% 7% 2 7% 5% 5% 5% 4 6% 9% 38%	6975
August	1st to 10th	Day	20% 5% 2 5% 4 5% 5% 3 6% 7% 38%	4563
	11th to 20th	Day	10% 5% 2 5% 4 3 4 3 5% 9% 48%	4496
	21st to end	Day	14% 6% 3 6% 4 4 5% 4 6% 8% 39%	4463
September	1st to 10th	Day	18% 9% 3 8% 4 4 4 4 5% 7% 33%	2400
	11th to 20th	Day	23% 11% 3 7% 5% 4 3 3 5% 7% 30%	2385
	21st to end	Day	22% 10% 3 6% 5% 4 4 3 4 6% 32%	2144
October	1st to 10th	Day	20% 18% 4 7% 4 3 5% 4 5% 6% 24%	2000
	11th to 20th	Day	19% 21% 6% 11% 5% 4 5% 3 3 5% 19%	1920
	21st to end	Day	19% 24% 8% 12% 5% 5% 5% 3 3 3 14%	1980
November	1st to 10th	Day	16% 23% 8% 13% 7% 4 4 3 3 3 17%	1672
	11th to 20th	Day	16% 21% 10% 16% 8% 5% 4 2 2 3 13%	1678
	21st to end	Day	14% 22% 9% 21% 8% 6% 3 3 3 3 9%	1470
December	1st to 10th	Day	8% 18% 7% 20% 13% 13% 4 3 4 3 7%	2327
	11th to 20th	Day	10% 12% 6% 19% 8% 5% 8% 4 8% 5% 14%	2316
	21st to end	Day	11% 19% 8% 17% 6% 7% 5% 4 5% 7% 12%	3058
January	1st to 10th	Night	5% 14% 7% 19% 9% 10% 9% 5% 5% 4 13%	8936
	11th to 20th	Night	6% 13% 7% 18% 11% 9% 9% 9% 7% 3 9%	8714
	21st to end	Night	5% 13% 5% 14% 9% 9% 10% 7% 10% 6% 12%	9058
February	1st to 10th	Night	5% 13% 5% 12% 8% 10% 11% 7% 7% 5% 16%	2898
	11th to 20th	Night	6% 13% 5% 9% 8% 8% 10% 7% 8% 7% 20%	2663
	21st to end	Night	5% 14% 6% 12% 8% 7% 6% 5% 6% 7% 25%	2153
March	1st to 10th	Night	7% 11% 5% 12% 8% 7% 6% 5% 5% 6% 28%	5482
	11th to 20th	Night	8% 16% 6% 13% 8% 8% 6% 4 5% 5% 21%	5283
	21st to end	Night	8% 17% 5% 9% 6% 6% 7% 4 5% 6% 26%	5177
April	1st to 10th	Night	10% 12% 4 11% 7% 6% 4 3 4 5% 35%	2100
	11th to 20th	Night	14% 13% 4 8% 4 5% 3 4 5% 6% 33%	2031
	21st to end	Night	13% 12% 4 9% 5% 4 4 3 5% 4 36%	1680
May	1st to 10th	Night	13% 14% 5% 7% 4 5% 4 3 5% 5% 35%	4688
	11th to 20th	Night	22% 11% 3 7% 4 3 3 2 4 5% 36%	4670
	21st to end	Night	14% 7% 2 5% 3 3 3 3 5% 6% 47%	4661
June	1st to 10th	Night	19% 8% 2 6% 3 4 5% 6% 7% 6% 32%	1260
	11th to 20th	Night	16% 9% 3 8% 4 3 4 4 5% 6% 37%	1260
	21st to end	Night	12% 7% 3 6% 5% 5% 4 5% 6% 8% 39%	1260
July	1st to 10th	Night	11% 6% 2 6% 5% 4 4 3 6% 8% 43%	2781
	11th to 20th	Night	14% 6% 2 6% 4 4 5% 4 6% 7% 42%	3180
	21st to end	Night	12% 6% 2 6% 4 4 5% 4 6% 9% 42%	3896
August	1st to 10th	Night	22% 4 2 5% 4 4 4 3 5% 7% 41%	2597
	11th to 20th	Night	9% 5% 2 6% 4 4 4 4 7% 10% 45%	2563
	21st to end	Night	15% 7% 3 6% 4 4 4 3 5% 7% 42%	3438
September	1st to 10th	Night	19% 8% 2 6% 3 3 3 3 4 6% 42%	2000
	11th to 20th	Night	22% 10% 3 7% 4 4 4 4 5% 6% 32%	2000
	21st to end	Night	24% 10% 3 6% 3 3 3 3 5% 6% 36%	2249
October	1st to 10th	Night	21% 14% 4 7% 4 4 4 3 4 6% 30%	2400
	11th to 20th	Night	20% 17% 4 10% 5% 4 4 3 4 4 24%	2480
	21st to end	Night	19% 20% 6% 10% 5% 5% 4 4 5% 6% 16%	2860
November	1st to 10th	Night	18% 21% 5% 13% 6% 5% 4 3 4 5% 17%	2842
	11th to 20th	Night	18% 18% 6% 15% 9% 6% 5% 3 4 4 13%	2940
	21st to end	Night	14% 22% 8% 18% 7% 7% 4 2 3 4 10%	3150
December	1st to 10th	Night	7% 22% 9% 20% 12% 8% 5% 4 3 2 9%	5078
	11th to 20th	Night	8% 15% 5% 17% 11% 9% 6% 5% 4 4 15%	6111
	21st to end	Night	9% 16% 9% 19% 8% 7% 5% 4 3 4 16%	8162

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	75% 3 6% 10% 5% 1	3984
	11th to 20th	Day	76% 3 6% 12% 4	4227
	21st to end	Day	69% 3 7% 14% 8%	5156
February	1st to 10th	Day	63% 5% 8% 16% 7%	1720
	11th to 20th	Day	59% 5% 12% 17% 6%	1853
	21st to end	Day	57% 4 9% 18% 12% 1	1652
March	1st to 10th	Day	61% 3 7% 13% 14% 2	4580
	11th to 20th	Day	62% 4 6% 14% 13% 1	4938
	21st to end	Day	59% 3 6% 21% 10% 1	5996
April	1st to 10th	Day	50% 4 10% 21% 13% 1	2520
	11th to 20th	Day	54% 4 9% 19% 12% 1	2535
	21st to end	Day	50% 4 9% 23% 13% 2	2940
May	1st to 10th	Day	54% 3 9% 21% 12%	8250
	11th to 20th	Day	54% 4 7% 21% 13% 1	8226
	21st to end	Day	40% 4 11% 25% 18% 2	9529
June	1st to 10th	Day	53% 8% 10% 18% 11% 1	3360
	11th to 20th	Day	48% 7% 11% 22% 12% 1	3360
	21st to end	Day	48% 7% 12% 21% 10% 1	3360
July	1st to 10th	Day	40% 5% 14% 33% 7%	7105
	11th to 20th	Day	44% 6% 18% 28% 4	6719
	21st to end	Day	43% 5% 17% 30% 5%	6775
August	1st to 10th	Day	44% 7% 13% 29% 8%	4548
	11th to 20th	Day	33% 6% 16% 36% 10%	4538
	21st to end	Day	42% 5% 17% 28% 8%	4462
September	1st to 10th	Day	51% 7% 14% 23% 6%	2400
	11th to 20th	Day	55% 6% 16% 20% 3	2385
	21st to end	Day	54% 5% 14% 20% 6%	2144
October	1st to 10th	Day	55% 5% 15% 18% 6%	3260
	11th to 20th	Day	58% 5% 13% 17% 6%	3110
	21st to end	Day	67% 4 12% 16% 1	3180
November	1st to 10th	Day	74% 4 10% 9% 3	1672
	11th to 20th	Day	78% 4 8% 8% 2	1678
	21st to end	Day	82% 4 4 6% 3	1470
December	1st to 10th	Day	83% 3 5% 7% 2	2327
	11th to 20th	Day	68% 2 9% 11% 9%	2316
	21st to end	Day	72% 3 6% 15% 3	3058
January	1st to 10th	Night	75% 3 6% 11% 4 2	8936
	11th to 20th	Night	75% 3 7% 12% 3	8761
	21st to end	Night	68% 3 7% 17% 5%	9058
February	1st to 10th	Night	64% 5% 8% 16% 6%	2898
	11th to 20th	Night	60% 5% 12% 17% 6%	2664
	21st to end	Night	57% 4 9% 19% 10%	2153
March	1st to 10th	Night	56% 4 7% 14% 16% 2	5493
	11th to 20th	Night	65% 4 6% 16% 8% 1	5284
	21st to end	Night	56% 3 7% 22% 10% 1	5177
April	1st to 10th	Night	53% 3 7% 21% 15% 2	2100
	11th to 20th	Night	50% 5% 9% 21% 14% 1	2031
	21st to end	Night	50% 4 9% 19% 15% 3	1680
May	1st to 10th	Night	52% 3 8% 25% 12%	4695
	11th to 20th	Night	52% 4 9% 22% 13% 1	4671
	21st to end	Night	38% 4 10% 28% 19% 1	4662
June	1st to 10th	Night	48% 7% 12% 21% 11% 1	1260
	11th to 20th	Night	46% 5% 12% 23% 14% 1	1260
	21st to end	Night	40% 8% 13% 28% 10%	1260
July	1st to 10th	Night	38% 5% 15% 31% 9%	2750
	11th to 20th	Night	41% 5% 16% 30% 6% 1	3138
	21st to end	Night	39% 5% 15% 36% 5%	3782
August	1st to 10th	Night	43% 7% 14% 31% 6%	2588
	11th to 20th	Night	33% 7% 17% 35% 8%	2587
	21st to end	Night	42% 6% 18% 25% 9%	3438
September	1st to 10th	Night	43% 5% 15% 29% 7% 1	2000
	11th to 20th	Night	53% 6% 16% 23% 3	2000
	21st to end	Night	50% 5% 15% 22% 7%	2249
October	1st to 10th	Night	49% 4 17% 21% 8%	3920
	11th to 20th	Night	58% 4 14% 20% 4	4029
	21st to end	Night	66% 5% 13% 15% 1	4610
November	1st to 10th	Night	69% 5% 12% 10% 3	2842
	11th to 20th	Night	76% 5% 9% 9% 2	2940
	21st to end	Night	80% 3 7% 7% 2	3150
December	1st to 10th	Night	83% 3 6% 6% 2	5078
	11th to 20th	Night	72% 3 9% 12% 4	6110
	21st to end	Night	72% 3 6% 15% 4	8162

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	16% 17% 39% 26% 2	303
	11th to 20th	Day	12% 14% 35% 28% 10% 2	330
	21st to end	Day	16% 12% 39% 24% 7% 1	363
February	1st to 10th	Day	15% 15% 42% 25% 4	330
	11th to 20th	Day	10% 16% 43% 24% 5% 2	330
	21st to end	Day	10% 19% 42% 21% 7% 1	273
March	1st to 10th	Day	16% 18% 38% 21% 6% 1	330
	11th to 20th	Day	17% 17% 45% 14% 6% 1	330
	21st to end	Day	16% 17% 33% 24% 8% 2	541
April	1st to 10th	Day	17% 15% 34% 26% 7% 1	540
	11th to 20th	Day	25% 15% 28% 22% 8% 2	545
	21st to end	Day	21% 14% 33% 22% 8% 2	750
May	1st to 10th	Day	24% 16% 30% 22% 7% 1	753
	11th to 20th	Day	27% 14% 32% 20% 6% 1	775
	21st to end	Day	25% 16% 31% 20% 7% 1	844
June	1st to 10th	Day	25% 16% 30% 21% 7% 2	780
	11th to 20th	Day	20% 17% 33% 20% 8% 2	780
	21st to end	Day	18% 14% 32% 23% 10% 3	780
July	1st to 10th	Day	16% 14% 32% 26% 10% 2	722
	11th to 20th	Day	17% 12% 35% 25% 9% 2	718
	21st to end	Day	14% 11% 32% 25% 15% 3	794
August	1st to 10th	Day	18% 11% 33% 25% 10% 2	726
	11th to 20th	Day	16% 14% 26% 25% 15% 4	715
	21st to end	Day	24% 10% 30% 22% 11% 2	673
September	1st to 10th	Day	25% 12% 30% 25% 8% 1	530
	11th to 20th	Day	27% 14% 28% 22% 8% 1	530
	21st to end	Day	28% 12% 27% 24% 7% 3	474
October	1st to 10th	Day	30% 15% 31% 17% 6% 1	330
	11th to 20th	Day	25% 17% 33% 18% 5% 1	330
	21st to end	Day	33% 15% 34% 13% 4 1	363
November	1st to 10th	Day	30% 17% 35% 14% 5%	330
	11th to 20th	Day	27% 19% 30% 19% 5% 1	328
	21st to end	Day	25% 24% 30% 15% 4	220
December	1st to 10th	Day	15% 15% 44% 21% 3	220
	11th to 20th	Day	16% 16% 43% 21% 4	220
	21st to end	Day	18% 14% 34% 22% 7% 4	242
January	1st to 10th	Night	14% 14% 40% 25% 7% 1	1050
	11th to 20th	Night	16% 12% 35% 28% 8% 1	1050
	21st to end	Night	15% 10% 37% 26% 10% 1	1155
February	1st to 10th	Night	11% 12% 41% 28% 7% 1	1050
	11th to 20th	Night	13% 10% 37% 29% 9% 1	1029
	21st to end	Night	11% 12% 34% 28% 12% 2	769
March	1st to 10th	Night	14% 13% 33% 27% 12% 1	840
	11th to 20th	Night	16% 13% 40% 24% 6% 2	720
	21st to end	Night	16% 15% 28% 28% 11% 2	693
April	1st to 10th	Night	15% 12% 32% 30% 9% 1	630
	11th to 20th	Night	19% 11% 30% 30% 8% 1	623
	21st to end	Night	19% 8% 33% 29% 9% 1	630
May	1st to 10th	Night	23% 10% 33% 27% 5%	630
	11th to 20th	Night	24% 10% 30% 26% 9% 1	621
	21st to end	Night	25% 8% 32% 28% 7%	557
June	1st to 10th	Night	23% 5% 35% 28% 8%	420
	11th to 20th	Night	20% 9% 31% 28% 11% 1	420
	21st to end	Night	16% 6% 27% 37% 12% 1	420
July	1st to 10th	Night	13% 9% 33% 29% 15% 1	411
	11th to 20th	Night	17% 7% 32% 32% 12% 1	582
	21st to end	Night	14% 6% 23% 38% 17% 2	657
August	1st to 10th	Night	19% 6% 27% 36% 12%	597
	11th to 20th	Night	14% 7% 26% 31% 20% 3	594
	21st to end	Night	20% 8% 29% 31% 13%	660
September	1st to 10th	Night	25% 7% 26% 31% 11% 1	600
	11th to 20th	Night	28% 11% 27% 25% 9% 1	600
	21st to end	Night	29% 9% 30% 23% 8% 1	795
October	1st to 10th	Night	29% 13% 30% 21% 6% 1	800
	11th to 20th	Night	31% 12% 24% 25% 7% 1	800
	21st to end	Night	29% 12% 30% 22% 7% 1	880
November	1st to 10th	Night	29% 13% 31% 20% 6% 1	996
	11th to 20th	Night	29% 11% 35% 19% 6% 1	1050
	21st to end	Night	26% 19% 33% 16% 5% 1	1050
December	1st to 10th	Night	14% 15% 41% 21% 7% 1	1050
	11th to 20th	Night	18% 14% 36% 23% 8% 1	1050
	21st to end	Night	20% 12% 33% 24% 8% 3	1155

Page generated at 2026-06-28 02:10:50. Version ac07

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