Baker Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Baker 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	10% 10% 4 10% 7% 6% 6% 5% 7% 8% 28%	103282
	Night	7% 11% 5% 11% 8% 8% 7% 6% 8% 8% 22%	95028
Transparency	Day	52% 7% 13% 21% 6%	102950
	Night	56% 8% 12% 17% 6%	95008
Seeing	Day	14% 4 15% 29% 25% 12%	17263
	Night	12% 4 17% 33% 26% 9%	23853

By Month

Percentage Cloud Cover NW (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	3 4 2 11% 11% 12% 11% 6% 10% 11% 19%	950
	11th to 20th	Day	3 10% 5% 15% 11% 11% 10% 6% 7% 5% 19%	1291
	21st to end	Day	3 9% 4 9% 8% 8% 7% 7% 9% 11% 25%	1745
February	1st to 10th	Day	1 6% 2 7% 7% 11% 13% 10% 12% 12% 18%	1244
	11th to 20th	Day	1 7% 3 10% 8% 9% 9% 8% 11% 12% 21%	1347
	21st to end	Day	1 5% 3 14% 10% 8% 8% 7% 10% 12% 23%	1371
March	1st to 10th	Day	3 7% 4 12% 7% 9% 11% 6% 8% 10% 23%	2878
	11th to 20th	Day	3 10% 6% 13% 10% 8% 8% 6% 8% 9% 20%	3447
	21st to end	Day	1 5% 2 8% 10% 8% 8% 6% 8% 14% 30%	4004
April	1st to 10th	Day	5% 12% 4 11% 7% 8% 7% 6% 10% 7% 23%	2470
	11th to 20th	Day	7% 11% 3 10% 8% 9% 11% 7% 7% 7% 20%	2602
	21st to end	Day	6% 8% 3 12% 10% 10% 10% 6% 6% 7% 21%	2850
May	1st to 10th	Day	10% 21% 6% 14% 8% 6% 5% 3 5% 4 16%	5162
	11th to 20th	Day	12% 13% 7% 11% 7% 5% 4 3 5% 7% 25%	5350
	21st to end	Day	10% 11% 5% 13% 8% 6% 5% 4 6% 6% 25%	6379
June	1st to 10th	Day	15% 13% 5% 10% 5% 5% 5% 4 6% 6% 26%	3610
	11th to 20th	Day	13% 10% 3 9% 6% 5% 5% 5% 6% 8% 30%	3610
	21st to end	Day	9% 8% 3 7% 5% 4 6% 5% 7% 8% 38%	3610
July	1st to 10th	Day	9% 5% 2 7% 5% 5% 6% 6% 9% 10% 36%	6020
	11th to 20th	Day	6% 5% 3 7% 5% 5% 6% 6% 7% 8% 41%	5979
	21st to end	Day	9% 5% 2 5% 4 4 5% 4 7% 8% 46%	5834
August	1st to 10th	Day	8% 6% 3 8% 4 5% 4 4 5% 7% 47%	5198
	11th to 20th	Day	17% 6% 3 6% 5% 4 4 4 6% 7% 37%	4658
	21st to end	Day	18% 8% 3 9% 5% 5% 6% 4 6% 7% 28%	4923
September	1st to 10th	Day	19% 14% 4 10% 7% 5% 5% 3 5% 6% 22%	2470
	11th to 20th	Day	17% 16% 6% 13% 6% 5% 5% 5% 5% 4 17%	2242
	21st to end	Day	24% 16% 7% 11% 6% 4 4 3 4 3 18%	2008
October	1st to 10th	Day	17% 17% 10% 15% 6% 5% 4 3 5% 4 13%	1756
	11th to 20th	Day	17% 21% 8% 14% 9% 5% 6% 4 4 3 9%	1508
	21st to end	Day	16% 24% 6% 17% 11% 6% 5% 3 3 3 5%	1508
November	1st to 10th	Day	10% 18% 7% 17% 8% 8% 8% 4 5% 7% 9%	1118
	11th to 20th	Day	7% 16% 5% 12% 8% 8% 8% 4 5% 7% 20%	1005
	21st to end	Day	4 15% 5% 15% 12% 8% 7% 6% 7% 7% 14%	760
December	1st to 10th	Day	2 10% 5% 12% 11% 13% 8% 7% 9% 9% 14%	612
	11th to 20th	Day	4 10% 3 11% 9% 9% 9% 7% 8% 13% 17%	718
	21st to end	Day	6% 14% 6% 16% 7% 7% 5% 4 8% 8% 19%	1045
January	1st to 10th	Night	2 6% 3 11% 10% 9% 10% 8% 13% 11% 17%	6005
	11th to 20th	Night	3 10% 5% 12% 12% 10% 9% 7% 7% 8% 17%	5607
	21st to end	Night	4 8% 3 10% 7% 6% 7% 7% 10% 10% 28%	5909
February	1st to 10th	Night	3 5% 2 9% 8% 12% 14% 10% 12% 10% 17%	2936
	11th to 20th	Night	2 5% 4 9% 8% 10% 9% 8% 10% 11% 23%	2719
	21st to end	Night	1 5% 4 12% 10% 10% 9% 7% 10% 9% 22%	2082
March	1st to 10th	Night	3 7% 3 11% 7% 9% 9% 6% 9% 11% 27%	4000
	11th to 20th	Night	6% 11% 5% 13% 8% 8% 7% 5% 8% 7% 22%	3512
	21st to end	Night	2 4 2 8% 10% 9% 7% 7% 8% 11% 31%	3627
April	1st to 10th	Night	5% 11% 4 11% 6% 8% 7% 4 7% 7% 30%	1710
	11th to 20th	Night	5% 10% 4 9% 8% 7% 7% 6% 7% 7% 28%	1529
	21st to end	Night	6% 8% 3 12% 9% 8% 6% 4 6% 6% 32%	1330
May	1st to 10th	Night	11% 18% 8% 14% 8% 5% 3 3 4 5% 22%	1803
	11th to 20th	Night	15% 13% 7% 10% 7% 5% 3 4 5% 5% 25%	1544
	21st to end	Night	9% 12% 6% 11% 4 4 4 3 4 9% 33%	1204
June	1st to 10th	Night	15% 17% 5% 6% 4 3 3 3 6% 7% 30%	570
	11th to 20th	Night	13% 10% 3 8% 6% 4 5% 5% 5% 5% 34%	570
	21st to end	Night	11% 8% 4 8% 3 3 4 5% 8% 8% 39%	570
July	1st to 10th	Night	12% 5% 2 5% 4 4 4 4 6% 10% 44%	950
	11th to 20th	Night	7% 5% 2 6% 6% 7% 6% 5% 7% 11% 37%	988
	21st to end	Night	10% 5% 2 4 3 5% 4 3 5% 7% 51%	1718
August	1st to 10th	Night	8% 6% 2 7% 3 4 4 4 6% 11% 45%	1734
	11th to 20th	Night	14% 7% 2 7% 4 4 5% 4 7% 7% 38%	2181
	21st to end	Night	23% 8% 3 8% 5% 5% 5% 4 6% 6% 28%	2743
September	1st to 10th	Night	19% 12% 4 10% 5% 5% 5% 3 5% 7% 24%	1710
	11th to 20th	Night	18% 14% 5% 12% 8% 5% 6% 4 6% 5% 17%	1935
	21st to end	Night	25% 16% 7% 9% 5% 5% 4 3 5% 4 18%	2121
October	1st to 10th	Night	17% 17% 8% 16% 6% 5% 3 3 4 4 15%	2201
	11th to 20th	Night	16% 21% 9% 13% 7% 6% 6% 3 4 4 11%	2452
	21st to end	Night	17% 22% 7% 17% 10% 7% 6% 3 3 3 4	2846
November	1st to 10th	Night	9% 21% 7% 15% 9% 8% 8% 5% 5% 7% 7%	2960
	11th to 20th	Night	7% 16% 5% 12% 9% 7% 6% 5% 7% 10% 16%	3174
	21st to end	Night	4 12% 6% 15% 10% 10% 7% 7% 8% 6% 13%	3420
December	1st to 10th	Night	3 10% 5% 12% 11% 11% 9% 6% 9% 10% 14%	3567
	11th to 20th	Night	3 10% 4 9% 8% 9% 9% 6% 10% 13% 18%	4479
	21st to end	Night	4 14% 7% 15% 8% 7% 8% 5% 7% 8% 16%	6622

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	52% 11% 15% 21% 2	950
	11th to 20th	Day	61% 11% 14% 9% 4	1304
	21st to end	Day	47% 6% 9% 20% 18%	1745
February	1st to 10th	Day	46% 12% 17% 23% 2 1	1244
	11th to 20th	Day	47% 10% 16% 20% 7%	1354
	21st to end	Day	48% 7% 12% 23% 10%	1371
March	1st to 10th	Day	52% 8% 13% 21% 6%	2878
	11th to 20th	Day	56% 7% 10% 15% 12%	3449
	21st to end	Day	41% 8% 11% 24% 15%	4004
April	1st to 10th	Day	54% 8% 10% 18% 10%	2470
	11th to 20th	Day	57% 10% 9% 17% 7%	2602
	21st to end	Day	58% 9% 10% 17% 5%	2850
May	1st to 10th	Day	71% 7% 6% 12% 4	5162
	11th to 20th	Day	59% 8% 10% 17% 5%	5354
	21st to end	Day	55% 9% 8% 22% 6%	6380
June	1st to 10th	Day	56% 8% 14% 19% 3	3610
	11th to 20th	Day	49% 9% 14% 25% 3	3610
	21st to end	Day	39% 8% 19% 29% 4	3610
July	1st to 10th	Day	39% 6% 17% 33% 5%	5926
	11th to 20th	Day	38% 6% 15% 36% 6%	5874
	21st to end	Day	34% 6% 17% 35% 9%	5650
August	1st to 10th	Day	37% 5% 17% 28% 10% 2	5178
	11th to 20th	Day	45% 6% 19% 23% 6% 1	4703
	21st to end	Day	55% 5% 21% 16% 3	4922
September	1st to 10th	Day	62% 7% 15% 15% 1	2470
	11th to 20th	Day	68% 9% 13% 9%	2242
	21st to end	Day	71% 7% 10% 10% 1	2008
October	1st to 10th	Day	76% 8% 10% 5% 1	1756
	11th to 20th	Day	80% 7% 8% 3 2	1508
	21st to end	Day	85% 6% 5% 4 1	1508
November	1st to 10th	Day	75% 7% 9% 9%	1118
	11th to 20th	Day	62% 9% 11% 15% 3	1005
	21st to end	Day	67% 7% 10% 13% 2	760
December	1st to 10th	Day	61% 10% 13% 12% 5%	612
	11th to 20th	Day	53% 12% 11% 23% 3	718
	21st to end	Day	60% 6% 12% 14% 9%	1045
January	1st to 10th	Night	50% 11% 16% 17% 5%	6005
	11th to 20th	Night	60% 9% 17% 11% 2	5656
	21st to end	Night	44% 7% 8% 24% 17%	5909
February	1st to 10th	Night	50% 12% 16% 18% 4	2936
	11th to 20th	Night	47% 8% 16% 22% 6%	2722
	21st to end	Night	50% 7% 11% 23% 8%	2082
March	1st to 10th	Night	47% 8% 14% 24% 8%	4000
	11th to 20th	Night	56% 8% 9% 14% 13%	3512
	21st to end	Night	42% 7% 11% 26% 13%	3627
April	1st to 10th	Night	51% 6% 10% 20% 13%	1710
	11th to 20th	Night	50% 9% 10% 22% 9%	1529
	21st to end	Night	50% 8% 9% 26% 7%	1330
May	1st to 10th	Night	65% 7% 7% 13% 7%	1803
	11th to 20th	Night	60% 8% 9% 15% 8%	1544
	21st to end	Night	47% 9% 6% 28% 10%	1204
June	1st to 10th	Night	53% 6% 12% 24% 4	570
	11th to 20th	Night	49% 8% 10% 29% 4	570
	21st to end	Night	40% 8% 17% 31% 3	570
July	1st to 10th	Night	35% 5% 15% 39% 5% 1	935
	11th to 20th	Night	40% 4 17% 32% 7%	970
	21st to end	Night	33% 4 18% 31% 14%	1663
August	1st to 10th	Night	34% 5% 23% 23% 13% 2	1729
	11th to 20th	Night	42% 6% 21% 22% 8%	2202
	21st to end	Night	56% 5% 17% 21% 1	2743
September	1st to 10th	Night	59% 8% 16% 16% 1	1710
	11th to 20th	Night	68% 9% 14% 9%	1935
	21st to end	Night	70% 6% 11% 12% 1	2121
October	1st to 10th	Night	74% 7% 11% 8%	2201
	11th to 20th	Night	78% 6% 8% 6% 2	2452
	21st to end	Night	86% 6% 3 4 1	2846
November	1st to 10th	Night	74% 9% 8% 9%	2960
	11th to 20th	Night	62% 10% 11% 16% 1	3174
	21st to end	Night	65% 9% 11% 12% 3	3420
December	1st to 10th	Night	61% 10% 12% 14% 4	3567
	11th to 20th	Night	52% 9% 13% 22% 3	4479
	21st to end	Night	63% 7% 11% 12% 7%	6622

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	2 1 11% 32% 36% 18%	90
	11th to 20th	Day	6% 9% 20% 43% 19% 3	90
	21st to end	Day	3 2 18% 39% 21% 17%	103
February	1st to 10th	Day	2 2 13% 30% 34% 19%	229
	11th to 20th	Day	1 2 8% 46% 33% 9%	270
	21st to end	Day	1 7% 36% 35% 20%	225
March	1st to 10th	Day	3 1 18% 30% 31% 17%	270
	11th to 20th	Day	5% 3 11% 36% 32% 13%	270
	21st to end	Day	5% 3 19% 31% 25% 17%	398
April	1st to 10th	Day	9% 5% 18% 33% 24% 11%	650
	11th to 20th	Day	10% 4 12% 30% 28% 16%	640
	21st to end	Day	7% 2 14% 31% 30% 16%	650
May	1st to 10th	Day	14% 4 16% 27% 24% 15%	653
	11th to 20th	Day	11% 4 20% 32% 24% 10%	684
	21st to end	Day	18% 5% 17% 27% 23% 10%	1036
June	1st to 10th	Day	21% 4 15% 26% 25% 9%	1060
	11th to 20th	Day	18% 5% 15% 32% 23% 7%	1060
	21st to end	Day	13% 3 18% 31% 25% 10%	1060
July	1st to 10th	Day	14% 4 12% 26% 30% 15%	1041
	11th to 20th	Day	11% 4 17% 33% 26% 9%	1021
	21st to end	Day	15% 3 16% 28% 23% 14%	739
August	1st to 10th	Day	15% 5% 13% 23% 26% 18%	676
	11th to 20th	Day	18% 5% 11% 25% 28% 13%	665
	21st to end	Day	18% 4 17% 25% 25% 11%	748
September	1st to 10th	Day	26% 6% 14% 22% 23% 9%	680
	11th to 20th	Day	23% 4 18% 27% 17% 11%	452
	21st to end	Day	30% 9% 16% 21% 17% 7%	294
October	1st to 10th	Day	22% 9% 22% 27% 17% 4	270
	11th to 20th	Day	27% 7% 18% 22% 21% 6%	270
	21st to end	Day	19% 7% 19% 28% 23% 4	297
November	1st to 10th	Day	13% 2 13% 35% 27% 10%	180
	11th to 20th	Day	12% 2 15% 33% 25% 12%	123
	21st to end	Day	9% 2 13% 31% 32% 12%	90
December	1st to 10th	Day	6% 12% 46% 26% 11%	90
	11th to 20th	Day	7% 1 11% 37% 29% 16%	90
	21st to end	Day	6% 2 22% 28% 28% 13%	99
January	1st to 10th	Night	6% 2 15% 33% 32% 12%	1130
	11th to 20th	Night	7% 4 20% 35% 24% 10%	1024
	21st to end	Night	4 3 23% 36% 25% 9%	1045
February	1st to 10th	Night	4 3 16% 32% 32% 13%	950
	11th to 20th	Night	4 1 15% 43% 29% 8%	929
	21st to end	Night	2 1 15% 35% 36% 10%	785
March	1st to 10th	Night	5% 4 19% 37% 28% 8%	928
	11th to 20th	Night	6% 3 14% 38% 28% 10%	589
	21st to end	Night	6% 2 17% 36% 28% 11%	627
April	1st to 10th	Night	10% 4 21% 32% 25% 7%	570
	11th to 20th	Night	9% 3 14% 36% 31% 7%	563
	21st to end	Night	9% 3 15% 35% 29% 9%	570
May	1st to 10th	Night	13% 4 17% 34% 26% 7%	335
	11th to 20th	Night	12% 3 20% 39% 25% 2	187
	21st to end	Night	18% 4 20% 24% 27% 6%	205
June	1st to 10th	Night	21% 5% 15% 26% 28% 4	190
	11th to 20th	Night	19% 2 19% 37% 19% 3	190
	21st to end	Night	16% 3 19% 42% 20% 1	190
July	1st to 10th	Night	15% 2 16% 30% 35% 4	185
	11th to 20th	Night	10% 6% 14% 37% 30% 2	184
	21st to end	Night	18% 4 13% 31% 29% 4	208
August	1st to 10th	Night	11% 3 14% 38% 27% 8%	273
	11th to 20th	Night	20% 5% 15% 28% 28% 4	564
	21st to end	Night	24% 3 15% 28% 25% 5%	627
September	1st to 10th	Night	25% 5% 14% 28% 24% 5%	570
	11th to 20th	Night	23% 4 18% 34% 17% 4	570
	21st to end	Night	30% 5% 19% 26% 18% 2	609
October	1st to 10th	Night	24% 6% 21% 27% 17% 5%	761
	11th to 20th	Night	23% 6% 20% 25% 22% 5%	900
	21st to end	Night	27% 6% 18% 25% 20% 5%	990
November	1st to 10th	Night	14% 3 18% 34% 22% 9%	925
	11th to 20th	Night	12% 2 23% 31% 23% 9%	958
	21st to end	Night	9% 5% 15% 29% 28% 15%	1040
December	1st to 10th	Night	6% 3 15% 36% 26% 14%	1109
	11th to 20th	Night	7% 4 15% 32% 27% 14%	1130
	21st to end	Night	8% 4 19% 29% 27% 13%	1243

Page generated at 2024-09-26 08:52:19. Version ac07

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