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 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	9% 10% 4 11% 7% 6% 6% 5% 7% 7% 26%	142587
	Night	7% 11% 5% 12% 8% 8% 7% 5% 7% 9% 21%	138505
Transparency	Day	55% 6% 13% 21% 5%	142205
	Night	58% 6% 13% 18% 6%	138472
Seeing	Day	14% 4 16% 29% 25% 11%	19554
	Night	12% 4 18% 33% 26% 8%	26294

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	2 7% 3 10% 9% 10% 9% 6% 8% 12% 25%	1764
	11th to 20th	Day	2 8% 4 12% 9% 10% 10% 7% 9% 7% 23%	2433
	21st to end	Day	1 6% 3 8% 8% 8% 8% 8% 10% 14% 26%	3254
February	1st to 10th	Day	1 6% 2 7% 7% 12% 14% 10% 12% 12% 17%	1376
	11th to 20th	Day	1 7% 3 10% 8% 8% 9% 8% 11% 13% 23%	1493
	21st to end	Day	1 5% 3 13% 10% 8% 9% 8% 10% 11% 23%	1511
March	1st to 10th	Day	2 5% 3 13% 13% 12% 12% 6% 7% 8% 19%	4228
	11th to 20th	Day	2 8% 5% 17% 12% 8% 8% 6% 7% 8% 18%	5043
	21st to end	Day	1 3 3 9% 9% 9% 10% 8% 10% 13% 26%	5850
April	1st to 10th	Day	5% 11% 4 12% 7% 8% 7% 6% 9% 8% 22%	2730
	11th to 20th	Day	6% 10% 3 10% 8% 9% 11% 7% 8% 7% 21%	2879
	21st to end	Day	5% 9% 3 12% 9% 10% 10% 6% 6% 8% 22%	3150
May	1st to 10th	Day	9% 18% 6% 17% 13% 7% 5% 3 5% 4 13%	9561
	11th to 20th	Day	8% 10% 5% 18% 9% 6% 5% 4 6% 7% 21%	9981
	21st to end	Day	12% 11% 5% 13% 7% 6% 5% 4 5% 7% 26%	11927
June	1st to 10th	Day	16% 13% 5% 10% 5% 5% 5% 4 6% 6% 26%	3990
	11th to 20th	Day	14% 11% 3 9% 6% 5% 5% 4 6% 8% 29%	3990
	21st to end	Day	8% 7% 3 7% 5% 4 6% 5% 7% 9% 40%	3990
July	1st to 10th	Day	8% 5% 2 6% 5% 5% 6% 6% 8% 10% 41%	8621
	11th to 20th	Day	5% 4 2 7% 5% 5% 6% 5% 7% 8% 45%	8565
	21st to end	Day	15% 6% 2 6% 4 4 5% 4 6% 7% 40%	8380
August	1st to 10th	Day	8% 6% 3 8% 4 4 4 4 5% 7% 47%	5363
	11th to 20th	Day	17% 6% 3 6% 5% 4 4 4 6% 7% 37%	4808
	21st to end	Day	18% 8% 3 9% 5% 5% 5% 4 6% 7% 29%	5078
September	1st to 10th	Day	19% 14% 4 10% 7% 5% 5% 3 5% 6% 22%	2600
	11th to 20th	Day	17% 16% 6% 13% 6% 5% 5% 5% 5% 4 17%	2360
	21st to end	Day	24% 17% 7% 11% 6% 4 4 3 4 3 18%	2135
October	1st to 10th	Day	20% 27% 13% 14% 5% 4 3 2 3 3 7%	3174
	11th to 20th	Day	20% 19% 11% 15% 7% 5% 4 4 3 3 9%	2707
	21st to end	Day	12% 20% 8% 22% 10% 6% 6% 4 4 3 4	2690
November	1st to 10th	Day	10% 20% 7% 17% 7% 8% 8% 4 5% 6% 8%	1238
	11th to 20th	Day	8% 17% 5% 12% 8% 8% 7% 4 6% 7% 19%	1109
	21st to end	Day	5% 14% 4 14% 12% 8% 8% 7% 8% 7% 14%	840
December	1st to 10th	Day	1 6% 3 11% 12% 12% 10% 8% 10% 15% 13%	1082
	11th to 20th	Day	2 6% 3 8% 7% 9% 12% 9% 10% 11% 23%	1158
	21st to end	Day	5% 20% 8% 20% 9% 5% 4 3 6% 6% 15%	1529
January	1st to 10th	Night	2 7% 4 13% 9% 8% 7% 6% 9% 11% 25%	11159
	11th to 20th	Night	3 9% 4 12% 10% 9% 8% 6% 9% 10% 21%	10457
	21st to end	Night	2 7% 3 10% 8% 8% 8% 7% 10% 12% 25%	10924
February	1st to 10th	Night	2 4 2 9% 8% 12% 13% 10% 12% 10% 17%	3244
	11th to 20th	Night	2 5% 4 9% 8% 10% 9% 7% 10% 11% 24%	3013
	21st to end	Night	1 5% 4 12% 10% 10% 9% 7% 10% 10% 23%	2294
March	1st to 10th	Night	2 5% 2 11% 11% 14% 11% 6% 7% 9% 22%	5895
	11th to 20th	Night	4 9% 5% 16% 11% 9% 8% 5% 8% 8% 18%	5137
	21st to end	Night	1 3 2 8% 8% 9% 9% 8% 10% 11% 30%	5325
April	1st to 10th	Night	5% 10% 4 12% 6% 8% 7% 5% 7% 7% 29%	1890
	11th to 20th	Night	5% 10% 4 9% 8% 7% 7% 6% 7% 7% 29%	1691
	21st to end	Night	5% 8% 3 13% 9% 9% 6% 4 6% 6% 31%	1470
May	1st to 10th	Night	11% 19% 7% 19% 11% 5% 3 2 3 4 16%	3377
	11th to 20th	Night	11% 11% 6% 20% 8% 5% 4 3 5% 5% 20%	2868
	21st to end	Night	10% 12% 6% 11% 5% 5% 5% 4 5% 8% 29%	2274
June	1st to 10th	Night	16% 17% 5% 8% 4 3 3 3 7% 7% 28%	630
	11th to 20th	Night	15% 10% 4 8% 7% 5% 5% 5% 5% 5% 33%	630
	21st to end	Night	10% 7% 3 7% 3 3 4 4 8% 9% 41%	630
July	1st to 10th	Night	12% 5% 2 5% 3 4 4 4 6% 10% 45%	1360
	11th to 20th	Night	7% 5% 2 7% 6% 8% 6% 5% 7% 9% 39%	1411
	21st to end	Night	15% 7% 2 5% 4 5% 4 3 4 6% 43%	2463
August	1st to 10th	Night	8% 6% 2 7% 3 4 4 4 6% 10% 46%	1788
	11th to 20th	Night	14% 7% 2 7% 4 4 5% 4 7% 8% 38%	2251
	21st to end	Night	22% 8% 3 7% 5% 5% 5% 4 6% 6% 29%	2830
September	1st to 10th	Night	19% 12% 4 10% 5% 5% 6% 3 6% 7% 24%	1800
	11th to 20th	Night	18% 14% 5% 12% 8% 5% 5% 4 6% 6% 17%	2037
	21st to end	Night	25% 17% 7% 9% 5% 5% 4 3 4 4 18%	2245
October	1st to 10th	Night	21% 21% 12% 16% 5% 4 3 2 3 3 9%	4006
	11th to 20th	Night	17% 20% 11% 17% 6% 5% 5% 3 3 3 9%	4442
	21st to end	Night	12% 21% 9% 21% 10% 6% 6% 3 3 3 6%	5108
November	1st to 10th	Night	9% 21% 7% 14% 8% 7% 8% 5% 5% 7% 8%	3280
	11th to 20th	Night	8% 17% 5% 12% 9% 7% 6% 5% 6% 9% 16%	3509
	21st to end	Night	5% 12% 6% 14% 10% 9% 8% 6% 8% 7% 14%	3780
December	1st to 10th	Night	2 6% 3 10% 11% 11% 10% 7% 11% 17% 13%	6327
	11th to 20th	Night	2 8% 3 7% 7% 10% 10% 8% 10% 11% 24%	7269
	21st to end	Night	5% 18% 8% 18% 8% 6% 7% 4 6% 6% 13%	9691

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	50% 6% 11% 28% 4	1764
	11th to 20th	Day	55% 6% 18% 16% 5%	2446
	21st to end	Day	45% 3 20% 20% 11%	3254
February	1st to 10th	Day	48% 11% 17% 22% 2 1	1376
	11th to 20th	Day	45% 9% 17% 21% 9%	1500
	21st to end	Day	49% 6% 11% 23% 10%	1511
March	1st to 10th	Day	60% 6% 9% 16% 8% 1	4228
	11th to 20th	Day	60% 5% 7% 15% 12%	5045
	21st to end	Day	44% 6% 9% 27% 13%	5850
April	1st to 10th	Day	55% 7% 10% 19% 9%	2730
	11th to 20th	Day	57% 9% 8% 18% 7%	2879
	21st to end	Day	58% 8% 10% 19% 6%	3150
May	1st to 10th	Day	75% 4 5% 12% 4	9558
	11th to 20th	Day	62% 4 10% 19% 4	9985
	21st to end	Day	57% 6% 15% 19% 3	11932
June	1st to 10th	Day	57% 7% 14% 19% 3	3990
	11th to 20th	Day	51% 8% 14% 24% 3	3990
	21st to end	Day	37% 7% 19% 32% 4	3990
July	1st to 10th	Day	36% 4 18% 35% 6%	8527
	11th to 20th	Day	35% 4 15% 40% 5%	8460
	21st to end	Day	43% 4 17% 30% 6%	8145
August	1st to 10th	Day	37% 5% 17% 29% 10% 2	5343
	11th to 20th	Day	45% 6% 19% 23% 6% 1	4853
	21st to end	Day	54% 5% 22% 16% 3	5077
September	1st to 10th	Day	62% 7% 15% 15% 1	2600
	11th to 20th	Day	69% 8% 14% 9%	2360
	21st to end	Day	71% 6% 10% 11% 1	2135
October	1st to 10th	Day	85% 4 6% 4	3174
	11th to 20th	Day	81% 4 6% 7% 2	2707
	21st to end	Day	85% 3 7% 4 1	2690
November	1st to 10th	Day	76% 6% 9% 8%	1238
	11th to 20th	Day	63% 8% 12% 14% 3	1109
	21st to end	Day	67% 7% 11% 13% 2	840
December	1st to 10th	Day	57% 6% 23% 12% 3	1082
	11th to 20th	Day	49% 8% 10% 31% 3	1158
	21st to end	Day	70% 4 8% 11% 7%	1529
January	1st to 10th	Night	49% 6% 13% 24% 7%	11160
	11th to 20th	Night	55% 5% 18% 20% 2	10506
	21st to end	Night	48% 4 14% 22% 11%	10925
February	1st to 10th	Night	50% 11% 17% 18% 4	3244
	11th to 20th	Night	47% 8% 16% 22% 8%	3016
	21st to end	Night	49% 7% 11% 26% 8%	2294
March	1st to 10th	Night	56% 6% 10% 18% 9% 1	5895
	11th to 20th	Night	61% 6% 6% 13% 14%	5137
	21st to end	Night	42% 5% 9% 29% 14%	5325
April	1st to 10th	Night	51% 6% 10% 21% 12%	1890
	11th to 20th	Night	51% 8% 10% 23% 9%	1691
	21st to end	Night	52% 7% 9% 25% 7%	1470
May	1st to 10th	Night	74% 4 5% 12% 6%	3377
	11th to 20th	Night	66% 4 8% 16% 5%	2868
	21st to end	Night	54% 5% 16% 20% 6%	2274
June	1st to 10th	Night	55% 6% 13% 23% 3	630
	11th to 20th	Night	52% 7% 9% 28% 4	630
	21st to end	Night	37% 8% 18% 33% 4	630
July	1st to 10th	Night	36% 3 17% 35% 8% 1	1345
	11th to 20th	Night	41% 3 16% 34% 6%	1393
	21st to end	Night	43% 2 16% 29% 10%	2393
August	1st to 10th	Night	34% 5% 22% 24% 12% 2	1783
	11th to 20th	Night	43% 6% 21% 22% 8%	2272
	21st to end	Night	56% 5% 18% 21% 1	2830
September	1st to 10th	Night	59% 7% 16% 16% 1	1800
	11th to 20th	Night	68% 9% 15% 9%	2037
	21st to end	Night	70% 6% 11% 11% 1	2245
October	1st to 10th	Night	82% 4 7% 7%	4006
	11th to 20th	Night	82% 4 6% 7% 2	4442
	21st to end	Night	85% 4 5% 5%	5108
November	1st to 10th	Night	74% 8% 9% 9% 1	3280
	11th to 20th	Night	64% 9% 11% 15% 1	3509
	21st to end	Night	64% 9% 11% 12% 3	3780
December	1st to 10th	Night	54% 6% 25% 12% 2	6327
	11th to 20th	Night	49% 6% 13% 29% 3	7269
	21st to end	Night	69% 5% 11% 9% 5%	9691

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	4 1 12% 35% 34% 15%	110
	11th to 20th	Day	5% 8% 25% 41% 18% 3	110
	21st to end	Day	2 4 21% 39% 20% 13%	127
February	1st to 10th	Day	2 2 15% 32% 32% 17%	281
	11th to 20th	Day	2 2 10% 46% 32% 9%	330
	21st to end	Day	1 1 11% 37% 33% 17%	273
March	1st to 10th	Day	2 1 16% 28% 32% 21%	330
	11th to 20th	Day	4 4 12% 35% 32% 14%	330
	21st to end	Day	4 2 16% 30% 30% 18%	474
April	1st to 10th	Day	9% 5% 19% 34% 23% 11%	750
	11th to 20th	Day	9% 4 12% 31% 27% 16%	740
	21st to end	Day	7% 3 15% 32% 30% 15%	750
May	1st to 10th	Day	14% 4 18% 29% 22% 13%	753
	11th to 20th	Day	10% 4 20% 32% 25% 9%	785
	21st to end	Day	17% 5% 16% 29% 23% 10%	1178
June	1st to 10th	Day	23% 4 15% 26% 24% 8%	1200
	11th to 20th	Day	20% 6% 16% 30% 22% 6%	1200
	21st to end	Day	11% 3 16% 30% 28% 13%	1200
July	1st to 10th	Day	13% 4 13% 26% 30% 14%	1112
	11th to 20th	Day	11% 4 18% 34% 25% 9%	1090
	21st to end	Day	16% 4 15% 27% 24% 13%	794
August	1st to 10th	Day	15% 6% 14% 23% 25% 17%	726
	11th to 20th	Day	18% 5% 11% 24% 27% 14%	715
	21st to end	Day	17% 5% 18% 25% 25% 12%	803
September	1st to 10th	Day	26% 6% 14% 23% 22% 9%	730
	11th to 20th	Day	23% 4 18% 29% 16% 10%	490
	21st to end	Day	32% 7% 16% 22% 16% 7%	330
October	1st to 10th	Day	25% 10% 22% 25% 15% 4	330
	11th to 20th	Day	29% 7% 19% 22% 18% 5%	330
	21st to end	Day	18% 8% 19% 30% 21% 4	363
November	1st to 10th	Day	14% 3 14% 36% 25% 9%	220
	11th to 20th	Day	14% 3 15% 34% 23% 10%	149
	21st to end	Day	9% 2 14% 35% 30% 10%	110
December	1st to 10th	Day	5% 14% 44% 26% 12%	110
	11th to 20th	Day	5% 1 14% 37% 30% 13%	110
	21st to end	Day	7% 2 26% 27% 26% 12%	121
January	1st to 10th	Night	6% 2 15% 34% 31% 11%	1270
	11th to 20th	Night	6% 4 22% 36% 23% 9%	1139
	21st to end	Night	4 3 24% 37% 24% 8%	1155
February	1st to 10th	Night	4 3 17% 34% 31% 12%	1050
	11th to 20th	Night	4 1 15% 44% 29% 7%	1029
	21st to end	Night	2 1 17% 37% 34% 10%	865
March	1st to 10th	Night	5% 3 18% 36% 30% 9%	1026
	11th to 20th	Night	6% 3 15% 38% 29% 10%	651
	21st to end	Night	5% 2 16% 36% 30% 11%	693
April	1st to 10th	Night	9% 4 21% 32% 26% 7%	630
	11th to 20th	Night	9% 3 14% 35% 32% 7%	623
	21st to end	Night	9% 3 16% 34% 30% 8%	630
May	1st to 10th	Night	15% 4 18% 34% 24% 6%	371
	11th to 20th	Night	11% 2 18% 39% 26% 3	207
	21st to end	Night	17% 4 19% 27% 27% 5%	227
June	1st to 10th	Night	21% 5% 16% 28% 27% 4	210
	11th to 20th	Night	21% 2 20% 36% 18% 3	210
	21st to end	Night	14% 3 18% 39% 25% 1	210
July	1st to 10th	Night	14% 2 16% 30% 34% 4	195
	11th to 20th	Night	10% 6% 15% 36% 30% 2	194
	21st to end	Night	19% 5% 13% 31% 29% 4	219
August	1st to 10th	Night	11% 3 14% 39% 26% 7%	287
	11th to 20th	Night	19% 5% 14% 27% 30% 4	594
	21st to end	Night	23% 3 16% 28% 25% 5%	660
September	1st to 10th	Night	25% 5% 15% 28% 23% 5%	600
	11th to 20th	Night	23% 5% 18% 34% 16% 4	600
	21st to end	Night	30% 6% 19% 26% 17% 2	645
October	1st to 10th	Night	24% 7% 21% 27% 16% 4	847
	11th to 20th	Night	25% 6% 21% 25% 20% 4	1000
	21st to end	Night	25% 6% 19% 26% 19% 4	1100
November	1st to 10th	Night	15% 3 19% 33% 22% 8%	1025
	11th to 20th	Night	15% 3 23% 30% 22% 8%	1060
	21st to end	Night	10% 5% 15% 30% 27% 13%	1160
December	1st to 10th	Night	6% 2 15% 37% 27% 13%	1245
	11th to 20th	Night	7% 3 16% 35% 27% 13%	1270
	21st to end	Night	8% 4 19% 30% 27% 12%	1397

Page generated at 2026-06-28 01:10:46. Version ac07

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