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 2025-02-25.

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	14% 12% 4 10% 6% 5% 5% 4 5% 6% 28%	108039
	Night	12% 13% 5% 12% 7% 6% 6% 4 5% 5% 24%	110818
Transparency	Day	55% 5% 11% 20% 8%	111458
	Night	61% 5% 10% 18% 7%	115561
Seeing	Day	21% 15% 33% 22% 8% 2	16224
	Night	20% 11% 32% 26% 9% 1	25938

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	5% 13% 5% 16% 9% 10% 9% 7% 7% 6% 13%	3063
	11th to 20th	Day	5% 10% 5% 20% 11% 10% 10% 7% 9% 5% 9%	3213
	21st to end	Day	8% 18% 6% 18% 8% 8% 7% 4 6% 6% 11%	3982
February	1st to 10th	Day	4 13% 5% 13% 8% 9% 10% 8% 7% 6% 18%	1638
	11th to 20th	Day	5% 11% 5% 11% 8% 7% 9% 9% 8% 7% 20%	1754
	21st to end	Day	3 12% 5% 15% 9% 6% 7% 5% 8% 7% 24%	1535
March	1st to 10th	Day	9% 11% 5% 12% 8% 5% 4 4 5% 5% 32%	3118
	11th to 20th	Day	7% 16% 8% 14% 7% 6% 6% 4 4 5% 24%	3374
	21st to end	Day	11% 17% 6% 9% 5% 6% 6% 3 5% 6% 27%	4091
April	1st to 10th	Day	11% 13% 4 10% 6% 4 4 3 5% 6% 33%	2280
	11th to 20th	Day	15% 14% 4 8% 5% 5% 4 3 4 5% 33%	2290
	21st to end	Day	13% 12% 4 8% 5% 3 5% 3 5% 7% 35%	2660
May	1st to 10th	Day	15% 15% 4 9% 5% 4 5% 4 5% 6% 29%	4428
	11th to 20th	Day	17% 14% 4 8% 5% 4 4 3 5% 6% 31%	4399
	21st to end	Day	23% 9% 3 5% 4 4 4 4 4 6% 35%	5085
June	1st to 10th	Day	22% 9% 3 8% 6% 4 5% 5% 6% 7% 26%	3040
	11th to 20th	Day	17% 8% 3 7% 5% 5% 5% 4 5% 8% 34%	3040
	21st to end	Day	16% 8% 3 7% 6% 5% 5% 5% 5% 8% 31%	3040
July	1st to 10th	Day	16% 7% 2 6% 5% 5% 5% 4 5% 8% 38%	5020
	11th to 20th	Day	14% 7% 2 6% 5% 5% 5% 4 6% 8% 39%	4750
	21st to end	Day	13% 7% 2 7% 5% 5% 5% 4 7% 9% 37%	4850
August	1st to 10th	Day	21% 5% 2 5% 4 4 5% 3 6% 7% 38%	4423
	11th to 20th	Day	10% 5% 2 5% 4 3 4 3 5% 9% 49%	4356
	21st to end	Day	15% 6% 2 6% 4 4 5% 4 6% 8% 38%	4327
September	1st to 10th	Day	17% 9% 3 8% 5% 4 4 4 5% 7% 34%	2280
	11th to 20th	Day	24% 12% 3 7% 5% 4 3 3 5% 7% 28%	2266
	21st to end	Day	23% 11% 3 7% 5% 4 4 4 4 6% 30%	2037
October	1st to 10th	Day	21% 18% 4 7% 4 3 5% 4 5% 6% 24%	1900
	11th to 20th	Day	19% 21% 6% 11% 5% 4 5% 3 4 5% 18%	1824
	21st to end	Day	20% 23% 8% 12% 5% 5% 5% 3 3 3 13%	1881
November	1st to 10th	Day	16% 24% 8% 12% 7% 4 4 2 3 3 17%	1591
	11th to 20th	Day	16% 21% 9% 16% 8% 5% 4 3 2 3 13%	1598
	21st to end	Day	14% 23% 9% 21% 8% 5% 3 3 2 3 10%	1400
December	1st to 10th	Day	9% 19% 7% 20% 13% 13% 3 3 4 3 7%	2258
	11th to 20th	Day	10% 12% 6% 19% 8% 5% 8% 4 9% 5% 14%	2256
	21st to end	Day	11% 19% 8% 17% 6% 7% 5% 4 5% 7% 12%	2992
January	1st to 10th	Night	4 14% 7% 18% 9% 11% 10% 5% 5% 4 12%	6897
	11th to 20th	Night	5% 10% 6% 20% 12% 9% 8% 9% 9% 3 9%	6690
	21st to end	Night	6% 17% 7% 17% 8% 8% 8% 5% 8% 5% 12%	6996
February	1st to 10th	Night	5% 13% 5% 12% 8% 10% 11% 8% 7% 6% 17%	2760
	11th to 20th	Night	6% 13% 4 9% 8% 8% 10% 8% 8% 7% 19%	2533
	21st to end	Night	4 13% 6% 12% 8% 7% 7% 5% 6% 7% 26%	2013
March	1st to 10th	Night	8% 11% 4 10% 9% 7% 6% 5% 5% 6% 28%	3722
	11th to 20th	Night	8% 18% 6% 12% 8% 8% 7% 4 4 4 21%	3613
	21st to end	Night	11% 16% 4 7% 5% 7% 7% 4 5% 6% 27%	3540
April	1st to 10th	Night	10% 12% 4 10% 7% 6% 4 3 4 5% 35%	1900
	11th to 20th	Night	13% 12% 4 8% 4 5% 4 4 6% 6% 33%	1836
	21st to end	Night	13% 12% 4 9% 5% 4 4 3 5% 4 37%	1520
May	1st to 10th	Night	15% 13% 4 8% 5% 4 4 3 5% 6% 32%	2523
	11th to 20th	Night	16% 10% 4 8% 5% 4 4 3 5% 6% 37%	2506
	21st to end	Night	23% 11% 3 6% 4 4 3 3 5% 5% 34%	2483
June	1st to 10th	Night	20% 8% 2 6% 4 5% 6% 6% 7% 6% 30%	1140
	11th to 20th	Night	16% 8% 3 9% 4 3 4 4 5% 7% 38%	1140
	21st to end	Night	12% 7% 3 7% 5% 5% 3 5% 6% 8% 39%	1140
July	1st to 10th	Night	14% 7% 2 6% 5% 4 4 4 6% 6% 41%	1947
	11th to 20th	Night	12% 6% 2 6% 4 4 5% 3 5% 7% 45%	2220
	21st to end	Night	11% 6% 2 6% 4 4 5% 4 6% 9% 43%	2711
August	1st to 10th	Night	22% 4 2 4 4 4 4 3 5% 7% 40%	2517
	11th to 20th	Night	9% 5% 2 6% 4 4 4 4 7% 10% 46%	2483
	21st to end	Night	15% 7% 3 6% 4 4 4 3 5% 7% 41%	3332
September	1st to 10th	Night	18% 7% 2 6% 3 3 3 3 4 6% 44%	1900
	11th to 20th	Night	23% 10% 3 7% 4 5% 4 4 4 6% 32%	1900
	21st to end	Night	24% 10% 3 6% 3 3 3 3 5% 6% 34%	2136
October	1st to 10th	Night	21% 14% 4 7% 4 4 4 3 5% 6% 29%	2280
	11th to 20th	Night	20% 17% 4 10% 5% 4 4 3 4 4 23%	2356
	21st to end	Night	19% 21% 6% 10% 6% 5% 4 4 5% 6% 15%	2717
November	1st to 10th	Night	18% 21% 5% 13% 6% 5% 3 3 4 5% 17%	2703
	11th to 20th	Night	18% 18% 6% 14% 9% 6% 5% 3 4 4 13%	2800
	21st to end	Night	14% 22% 8% 18% 7% 7% 4 2 3 4 10%	3000
December	1st to 10th	Night	7% 22% 9% 21% 12% 8% 4 3 3 2 9%	4927
	11th to 20th	Night	8% 15% 5% 17% 11% 9% 6% 5% 5% 4 15%	5951
	21st to end	Night	9% 16% 9% 19% 8% 7% 5% 4 3 4 16%	7986

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	70% 4 8% 12% 6% 1	3064
	11th to 20th	Day	72% 4 8% 13% 3	3241
	21st to end	Day	73% 3 4 10% 9%	3982
February	1st to 10th	Day	62% 5% 8% 17% 7%	1638
	11th to 20th	Day	58% 5% 12% 17% 6%	1763
	21st to end	Day	56% 4 8% 18% 13% 1	1535
March	1st to 10th	Day	52% 4 10% 18% 15% 1	3120
	11th to 20th	Day	63% 4 7% 18% 7% 1	3374
	21st to end	Day	59% 3 7% 19% 10% 1	4091
April	1st to 10th	Day	50% 4 11% 20% 14% 1	2280
	11th to 20th	Day	54% 4 9% 19% 13% 1	2290
	21st to end	Day	48% 5% 10% 22% 13% 2	2660
May	1st to 10th	Day	54% 5% 11% 22% 8%	4440
	11th to 20th	Day	53% 6% 8% 20% 12% 1	4403
	21st to end	Day	50% 6% 9% 19% 16% 1	5085
June	1st to 10th	Day	55% 8% 10% 16% 10% 1	3040
	11th to 20th	Day	47% 7% 11% 21% 13% 1	3040
	21st to end	Day	49% 8% 13% 20% 10% 1	3040
July	1st to 10th	Day	44% 5% 16% 26% 8%	4942
	11th to 20th	Day	42% 7% 19% 27% 5%	4669
	21st to end	Day	43% 6% 18% 29% 5%	4696
August	1st to 10th	Day	44% 7% 13% 29% 8%	4408
	11th to 20th	Day	32% 6% 16% 36% 10%	4398
	21st to end	Day	42% 6% 17% 27% 8%	4326
September	1st to 10th	Day	50% 7% 14% 23% 7%	2280
	11th to 20th	Day	56% 6% 15% 19% 3	2266
	21st to end	Day	56% 5% 14% 19% 6%	2037
October	1st to 10th	Day	55% 5% 14% 18% 6%	3160
	11th to 20th	Day	58% 5% 14% 17% 6%	3014
	21st to end	Day	68% 4 13% 15% 1	3081
November	1st to 10th	Day	75% 4 9% 9% 2	1591
	11th to 20th	Day	78% 4 8% 8% 2	1598
	21st to end	Day	82% 4 5% 6% 3	1400
December	1st to 10th	Day	83% 3 5% 7% 2	2258
	11th to 20th	Day	68% 3 9% 11% 9%	2256
	21st to end	Day	72% 3 7% 15% 3	2992
January	1st to 10th	Night	74% 4 6% 12% 3 1	6897
	11th to 20th	Night	73% 4 8% 13% 3	6737
	21st to end	Night	71% 4 6% 13% 6%	6996
February	1st to 10th	Night	63% 5% 8% 16% 7% 1	2760
	11th to 20th	Night	59% 6% 12% 17% 6%	2534
	21st to end	Night	56% 4 9% 20% 11%	2013
March	1st to 10th	Night	54% 5% 10% 17% 14% 1	3733
	11th to 20th	Night	65% 5% 8% 16% 5% 1	3614
	21st to end	Night	54% 4 9% 19% 12% 1	3540
April	1st to 10th	Night	53% 3 7% 20% 14% 2	1900
	11th to 20th	Night	49% 5% 8% 21% 15% 1	1836
	21st to end	Night	49% 4 9% 19% 16% 3	1520
May	1st to 10th	Night	51% 5% 9% 25% 10%	2530
	11th to 20th	Night	48% 6% 9% 22% 14% 1	2507
	21st to end	Night	52% 6% 8% 19% 14% 1	2484
June	1st to 10th	Night	49% 7% 13% 21% 11%	1140
	11th to 20th	Night	45% 5% 12% 22% 15% 1	1140
	21st to end	Night	40% 8% 13% 28% 10% 1	1140
July	1st to 10th	Night	42% 7% 15% 23% 12% 1	1916
	11th to 20th	Night	38% 6% 18% 29% 8% 1	2178
	21st to end	Night	36% 6% 16% 36% 6%	2625
August	1st to 10th	Night	43% 7% 14% 31% 6%	2508
	11th to 20th	Night	32% 7% 17% 36% 8%	2507
	21st to end	Night	42% 6% 18% 25% 9%	3332
September	1st to 10th	Night	41% 5% 15% 30% 7% 1	1900
	11th to 20th	Night	54% 6% 15% 22% 3	1900
	21st to end	Night	51% 6% 15% 21% 7%	2136
October	1st to 10th	Night	49% 5% 17% 21% 8%	3800
	11th to 20th	Night	58% 4 15% 20% 4	3905
	21st to end	Night	67% 5% 13% 14% 1	4467
November	1st to 10th	Night	69% 5% 13% 10% 3	2703
	11th to 20th	Night	75% 5% 9% 9% 2	2800
	21st to end	Night	80% 4 7% 7% 2	3000
December	1st to 10th	Night	83% 3 6% 6% 2	4927
	11th to 20th	Night	71% 3 9% 12% 4	5950
	21st to end	Night	72% 3 6% 15% 4	7986

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% 16% 38% 28% 3	275
	11th to 20th	Day	11% 12% 34% 30% 11% 2	300
	21st to end	Day	17% 13% 38% 22% 8% 2	330
February	1st to 10th	Day	14% 16% 42% 25% 4	300
	11th to 20th	Day	10% 17% 40% 25% 5% 2	300
	21st to end	Day	10% 18% 45% 19% 7% 1	237
March	1st to 10th	Day	14% 17% 37% 23% 7% 1	270
	11th to 20th	Day	19% 17% 42% 15% 7% 1	270
	21st to end	Day	17% 17% 31% 24% 8% 3	458
April	1st to 10th	Day	18% 15% 33% 25% 8% 1	460
	11th to 20th	Day	25% 14% 28% 22% 9% 2	463
	21st to end	Day	19% 15% 35% 21% 9% 2	650
May	1st to 10th	Day	24% 16% 30% 21% 7% 1	653
	11th to 20th	Day	26% 14% 32% 20% 6% 2	675
	21st to end	Day	28% 15% 30% 19% 7% 1	734
June	1st to 10th	Day	27% 16% 28% 19% 8% 3	680
	11th to 20th	Day	20% 18% 33% 19% 8% 2	680
	21st to end	Day	19% 14% 32% 23% 9% 3	680
July	1st to 10th	Day	17% 14% 32% 26% 9% 2	671
	11th to 20th	Day	17% 13% 34% 25% 9% 3	668
	21st to end	Day	14% 11% 31% 25% 15% 4	739
August	1st to 10th	Day	18% 10% 34% 25% 11% 2	676
	11th to 20th	Day	16% 13% 26% 25% 16% 5%	665
	21st to end	Day	25% 11% 30% 22% 10% 2	625
September	1st to 10th	Day	23% 11% 32% 25% 8% 1	490
	11th to 20th	Day	29% 14% 29% 21% 6% 1	490
	21st to end	Day	29% 12% 27% 24% 6% 1	437
October	1st to 10th	Day	31% 13% 29% 18% 7% 1	300
	11th to 20th	Day	24% 17% 33% 19% 5% 1	300
	21st to end	Day	34% 16% 34% 12% 4 1	330
November	1st to 10th	Day	30% 16% 33% 15% 5%	300
	11th to 20th	Day	26% 17% 31% 20% 5% 1	298
	21st to end	Day	27% 24% 28% 16% 5% 1	200
December	1st to 10th	Day	17% 15% 42% 23% 4 1	200
	11th to 20th	Day	16% 16% 44% 20% 4 1	200
	21st to end	Day	18% 13% 35% 21% 8% 5%	220
January	1st to 10th	Night	13% 13% 41% 26% 7% 1	1000
	11th to 20th	Night	16% 12% 34% 29% 8% 1	1000
	21st to end	Night	16% 10% 37% 25% 11% 1	1100
February	1st to 10th	Night	11% 12% 41% 29% 8% 1	1000
	11th to 20th	Night	13% 10% 37% 29% 10% 2	979
	21st to end	Night	10% 12% 34% 29% 12% 2	721
March	1st to 10th	Night	13% 13% 32% 27% 13% 1	760
	11th to 20th	Night	18% 12% 39% 24% 6% 2	652
	21st to end	Night	17% 14% 27% 28% 12% 2	627
April	1st to 10th	Night	16% 13% 31% 30% 9% 1	570
	11th to 20th	Night	19% 12% 29% 30% 9% 2	563
	21st to end	Night	18% 8% 34% 29% 10% 1	570
May	1st to 10th	Night	24% 11% 33% 26% 5%	570
	11th to 20th	Night	23% 11% 30% 25% 10% 1	561
	21st to end	Night	27% 8% 32% 27% 6%	503
June	1st to 10th	Night	23% 6% 33% 27% 9% 1	380
	11th to 20th	Night	19% 10% 31% 29% 11% 1	380
	21st to end	Night	16% 6% 28% 37% 12% 1	380
July	1st to 10th	Night	13% 9% 33% 29% 15% 1	390
	11th to 20th	Night	17% 7% 32% 31% 12% 1	552
	21st to end	Night	14% 6% 23% 38% 18% 2	624
August	1st to 10th	Night	20% 6% 26% 36% 12%	567
	11th to 20th	Night	13% 7% 26% 32% 20% 3	564
	21st to end	Night	20% 8% 29% 31% 13%	627
September	1st to 10th	Night	23% 7% 27% 32% 11% 1	570
	11th to 20th	Night	30% 11% 26% 24% 8% 1	570
	21st to end	Night	30% 8% 30% 23% 8% 1	755
October	1st to 10th	Night	30% 13% 29% 21% 6% 1	760
	11th to 20th	Night	31% 12% 24% 25% 7% 1	760
	21st to end	Night	29% 12% 29% 22% 6% 1	836
November	1st to 10th	Night	30% 12% 31% 20% 6% 1	947
	11th to 20th	Night	29% 10% 35% 19% 6% 1	1000
	21st to end	Night	26% 20% 31% 17% 5% 1	1000
December	1st to 10th	Night	15% 15% 41% 22% 7% 1	1000
	11th to 20th	Night	18% 14% 36% 24% 8% 1	1000
	21st to end	Night	20% 12% 32% 24% 9% 3	1100

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