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 2024-09-29.

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 9% 6% 5% 5% 4 5% 6% 29%	101537
	Night	13% 13% 5% 11% 7% 6% 6% 4 5% 6% 25%	96825
Transparency	Day	54% 5% 11% 20% 8% 1	101278
	Night	59% 5% 11% 18% 7%	96702
Seeing	Day	21% 15% 32% 22% 8% 2	15821
	Night	20% 11% 32% 26% 9% 1	25229

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	7% 13% 5% 17% 10% 12% 11% 5% 6% 5% 10%	2131
	11th to 20th	Day	5% 8% 4 18% 13% 10% 10% 6% 8% 6% 13%	2255
	21st to end	Day	11% 21% 6% 18% 7% 8% 7% 4 6% 4 9%	2783
February	1st to 10th	Day	5% 14% 5% 12% 7% 8% 10% 8% 7% 6% 19%	1556
	11th to 20th	Day	6% 12% 6% 12% 8% 6% 8% 8% 8% 6% 20%	1664
	21st to end	Day	3 12% 5% 14% 8% 6% 7% 5% 8% 7% 24%	1498
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	24% 11% 3 7% 5% 4 4 4 4 6% 30%	2017
October	1st to 10th	Day	21% 18% 5% 8% 4 3 4 3 5% 5% 23%	1800
	11th to 20th	Day	19% 21% 6% 12% 5% 4 5% 3 3 5% 18%	1728
	21st to end	Day	20% 24% 8% 12% 5% 4 5% 3 3 3 12%	1782
November	1st to 10th	Day	16% 24% 8% 13% 7% 4 4 2 3 3 15%	1510
	11th to 20th	Day	15% 21% 9% 16% 8% 5% 4 3 2 3 13%	1519
	21st to end	Day	14% 21% 9% 21% 8% 5% 3 3 3 3 10%	1330
December	1st to 10th	Day	9% 17% 8% 19% 10% 6% 5% 5% 5% 4 12%	1321
	11th to 20th	Day	10% 14% 6% 18% 6% 5% 6% 5% 6% 4 18%	1436
	21st to end	Day	12% 16% 7% 14% 7% 6% 7% 4 6% 7% 13%	2090
January	1st to 10th	Night	5% 15% 6% 18% 8% 12% 10% 5% 6% 4 10%	4819
	11th to 20th	Night	6% 9% 5% 18% 14% 10% 8% 7% 8% 4 10%	4713
	21st to end	Night	8% 20% 8% 17% 8% 6% 7% 6% 7% 4 10%	4884
February	1st to 10th	Night	5% 13% 5% 12% 8% 10% 10% 8% 7% 6% 17%	2622
	11th to 20th	Night	7% 13% 4 9% 7% 7% 10% 7% 8% 7% 19%	2403
	21st to end	Night	4 13% 6% 12% 8% 7% 7% 5% 6% 7% 26%	1955
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	25% 10% 3 6% 3 3 3 3 5% 6% 33%	2124
October	1st to 10th	Night	22% 15% 4 7% 4 4 4 3 4 6% 28%	2160
	11th to 20th	Night	21% 18% 4 10% 5% 5% 4 3 5% 4 23%	2232
	21st to end	Night	20% 21% 6% 11% 6% 5% 4 4 4 5% 15%	2574
November	1st to 10th	Night	19% 21% 5% 13% 6% 5% 4 3 4 5% 16%	2564
	11th to 20th	Night	17% 18% 6% 15% 9% 6% 5% 3 4 3 14%	2660
	21st to end	Night	15% 21% 8% 18% 7% 7% 4 2 3 4 11%	2850
December	1st to 10th	Night	8% 16% 6% 18% 11% 8% 6% 5% 4 3 14%	2854
	11th to 20th	Night	8% 17% 5% 17% 9% 8% 6% 5% 5% 5% 15%	3761
	21st to end	Night	10% 14% 8% 15% 9% 7% 6% 4 4 5% 17%	5577

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% 4 10% 10% 2	2132
	11th to 20th	Day	69% 5% 9% 14% 3	2255
	21st to end	Day	78% 4 6% 8% 5%	2783
February	1st to 10th	Day	61% 5% 8% 17% 8%	1556
	11th to 20th	Day	58% 6% 12% 17% 7%	1673
	21st to end	Day	56% 4 9% 18% 13% 1	1498
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% 5%	2017
October	1st to 10th	Day	62% 6% 13% 16% 2 1	1800
	11th to 20th	Day	69% 5% 10% 13% 2	1728
	21st to end	Day	78% 5% 8% 8% 1	1782
November	1st to 10th	Day	76% 4 9% 8% 2	1510
	11th to 20th	Day	78% 4 8% 8% 2	1519
	21st to end	Day	81% 4 5% 6% 3	1330
December	1st to 10th	Day	74% 4 7% 11% 4	1321
	11th to 20th	Day	65% 4 9% 14% 8%	1436
	21st to end	Day	69% 4 8% 15% 4	2090
January	1st to 10th	Night	74% 5% 9% 10% 2	4819
	11th to 20th	Night	71% 5% 10% 11% 2	4713
	21st to end	Night	74% 5% 8% 9% 4	4884
February	1st to 10th	Night	63% 5% 9% 16% 7% 1	2622
	11th to 20th	Night	60% 6% 11% 17% 6%	2404
	21st to end	Night	56% 4 9% 20% 11%	1955
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	52% 6% 15% 21% 6%	2124
October	1st to 10th	Night	56% 6% 15% 18% 5%	2160
	11th to 20th	Night	64% 6% 13% 15% 2	2232
	21st to end	Night	70% 7% 11% 10% 1	2574
November	1st to 10th	Night	70% 5% 12% 9% 3	2564
	11th to 20th	Night	75% 5% 9% 9% 2	2660
	21st to end	Night	79% 4 8% 7% 3	2850
December	1st to 10th	Night	74% 5% 7% 10% 4	2854
	11th to 20th	Night	69% 4 8% 15% 3	3760
	21st to end	Night	69% 4 7% 16% 4	5577

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% 37% 27% 3	247
	11th to 20th	Day	12% 11% 35% 29% 11% 2	270
	21st to end	Day	18% 12% 38% 22% 8% 2	297
February	1st to 10th	Day	15% 14% 43% 23% 4	270
	11th to 20th	Day	11% 19% 40% 23% 5% 1	270
	21st to end	Day	11% 19% 43% 19% 7% 1	225
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% 28% 23% 6% 1	431
October	1st to 10th	Day	30% 12% 29% 20% 7% 1	270
	11th to 20th	Day	24% 18% 31% 20% 6% 1	270
	21st to end	Day	35% 15% 32% 13% 4 1	297
November	1st to 10th	Day	31% 17% 32% 16% 4	270
	11th to 20th	Day	24% 19% 30% 20% 5% 1	269
	21st to end	Day	25% 26% 26% 17% 5% 1	180
December	1st to 10th	Day	17% 16% 41% 22% 4 1	180
	11th to 20th	Day	16% 18% 42% 19% 4 1	180
	21st to end	Day	18% 15% 36% 19% 8% 5%	198
January	1st to 10th	Night	13% 13% 41% 25% 7% 1	950
	11th to 20th	Night	17% 12% 35% 28% 8% 1	950
	21st to end	Night	16% 10% 36% 26% 11% 1	1045
February	1st to 10th	Night	11% 11% 40% 29% 8% 1	950
	11th to 20th	Night	14% 10% 36% 29% 10% 2	929
	21st to end	Night	9% 13% 34% 29% 13% 2	699
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% 9% 30% 23% 8% 1	751
October	1st to 10th	Night	30% 12% 28% 22% 7% 1	720
	11th to 20th	Night	31% 12% 24% 25% 8% 1	720
	21st to end	Night	30% 12% 28% 22% 6% 1	792
November	1st to 10th	Night	30% 12% 31% 19% 6% 1	898
	11th to 20th	Night	28% 10% 36% 19% 6% 1	950
	21st to end	Night	26% 19% 31% 17% 5% 1	950
December	1st to 10th	Night	15% 15% 40% 22% 7% 1	950
	11th to 20th	Night	18% 14% 34% 25% 8% 1	950
	21st to end	Night	20% 12% 32% 24% 9% 3	1045

Page generated at 2024-09-26 09:52:24. Version ac07

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