Kirkland Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Kirkland Lake clear sky chart from 2005-11-06 to 2024-01-12.

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	18% 12% 5% 8% 7% 3 5% 4 5% 6% 26%	74680
	Night	17% 13% 5% 9% 7% 4 5% 4 4 6% 25%	75044
Transparency	Day	59% 4 10% 18% 8% 1	74369
	Night	61% 4 10% 17% 8% 1	74890
Seeing	Day	25% 12% 32% 21% 8% 2	14089
	Night	24% 11% 31% 24% 9% 1	23265

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	15% 17% 10% 12% 8% 4 6% 5% 6% 5% 13%	1328
	11th to 20th	Day	16% 16% 6% 11% 8% 4 6% 6% 6% 6% 15%	1272
	21st to end	Day	13% 16% 6% 10% 9% 6% 6% 5% 7% 7% 16%	1659
February	1st to 10th	Day	8% 15% 7% 11% 10% 6% 9% 6% 5% 6% 18%	1620
	11th to 20th	Day	10% 18% 8% 9% 7% 4 6% 6% 4 7% 21%	1573
	21st to end	Day	11% 18% 7% 9% 9% 5% 6% 3 3 5% 24%	1332
March	1st to 10th	Day	13% 13% 5% 11% 9% 4 6% 5% 5% 6% 24%	1926
	11th to 20th	Day	13% 14% 6% 9% 8% 4 4 4 4 5% 29%	1980
	21st to end	Day	15% 14% 4 8% 6% 4 5% 3 4 5% 32%	2178
April	1st to 10th	Day	20% 15% 6% 10% 6% 3 4 4 5% 6% 22%	2142
	11th to 20th	Day	20% 11% 4 7% 6% 3 4 4 4 6% 31%	2312
	21st to end	Day	20% 12% 4 6% 5% 3 5% 4 4 5% 32%	2340
May	1st to 10th	Day	16% 11% 4 8% 6% 4 5% 5% 6% 7% 29%	2452
	11th to 20th	Day	22% 10% 4 7% 6% 3 4 4 4 6% 30%	2478
	21st to end	Day	19% 8% 3 6% 6% 3 4 4 5% 7% 36%	2835
June	1st to 10th	Day	21% 9% 3 6% 6% 3 5% 5% 6% 7% 29%	2700
	11th to 20th	Day	16% 7% 3 6% 6% 3 5% 5% 5% 9% 35%	2700
	21st to end	Day	20% 7% 3 6% 6% 3 6% 4 7% 8% 30%	2700
July	1st to 10th	Day	17% 7% 3 5% 5% 3 5% 5% 6% 8% 35%	2700
	11th to 20th	Day	16% 7% 3 6% 6% 3 6% 6% 7% 9% 34%	2700
	21st to end	Day	17% 6% 3 6% 6% 4 5% 6% 6% 9% 31%	2860
August	1st to 10th	Day	17% 7% 3 7% 7% 4 6% 6% 6% 8% 29%	2337
	11th to 20th	Day	18% 8% 3 6% 6% 4 4 5% 6% 8% 32%	2303
	21st to end	Day	19% 6% 3 6% 6% 4 5% 6% 6% 8% 31%	2561
September	1st to 10th	Day	21% 7% 3 6% 6% 3 5% 4 6% 6% 33%	2160
	11th to 20th	Day	24% 8% 3 6% 5% 3 4 4 5% 7% 30%	2052
	21st to end	Day	25% 10% 3 6% 5% 3 3 4 5% 6% 30%	1950
October	1st to 10th	Day	23% 12% 3 7% 6% 2 3 4 5% 5% 29%	1800
	11th to 20th	Day	29% 19% 4 6% 6% 3 3 3 4 5% 17%	1800
	21st to end	Day	28% 21% 6% 7% 7% 3 4 4 3 4 13%	1862
November	1st to 10th	Day	23% 20% 7% 7% 5% 3 4 3 4 4 20%	1486
	11th to 20th	Day	21% 18% 7% 13% 10% 4 5% 3 4 4 13%	1520
	21st to end	Day	24% 19% 9% 14% 7% 4 4 3 4 4 10%	1520
December	1st to 10th	Day	19% 19% 9% 14% 8% 3 4 3 4 4 14%	1440
	11th to 20th	Day	17% 15% 7% 12% 9% 4 5% 5% 4 4 18%	1671
	21st to end	Day	17% 21% 10% 18% 9% 3 3 3 3 3 9%	2431
January	1st to 10th	Night	15% 18% 8% 14% 9% 4 5% 5% 5% 4 13%	2838
	11th to 20th	Night	16% 17% 6% 11% 8% 3 6% 6% 5% 5% 15%	2728
	21st to end	Night	12% 15% 6% 11% 10% 6% 7% 5% 5% 6% 17%	2692
February	1st to 10th	Night	11% 14% 6% 10% 11% 4 7% 5% 6% 7% 18%	2340
	11th to 20th	Night	12% 15% 6% 11% 8% 4 6% 4 4 6% 23%	2273
	21st to end	Night	10% 15% 7% 14% 8% 4 6% 5% 5% 6% 21%	1920
March	1st to 10th	Night	11% 13% 6% 12% 8% 4 6% 4 4 6% 26%	2020
	11th to 20th	Night	16% 12% 6% 10% 9% 5% 4 3 3 5% 26%	1979
	21st to end	Night	14% 13% 4 8% 6% 3 4 4 4 5% 34%	2178
April	1st to 10th	Night	21% 15% 5% 9% 5% 3 3 4 4 5% 27%	1824
	11th to 20th	Night	19% 11% 3 8% 6% 3 5% 4 4 6% 32%	1607
	21st to end	Night	19% 10% 4 5% 5% 3 4 4 5% 5% 36%	1620
May	1st to 10th	Night	17% 9% 4 6% 5% 4 5% 4 4 6% 36%	1508
	11th to 20th	Night	18% 7% 3 5% 6% 4 5% 5% 6% 7% 35%	1415
	21st to end	Night	16% 7% 3 6% 4 3 4 5% 4 7% 41%	1438
June	1st to 10th	Night	21% 8% 4 5% 4 3 5% 5% 6% 8% 32%	1260
	11th to 20th	Night	17% 5% 2 5% 4 3 4 5% 5% 7% 43%	1260
	21st to end	Night	16% 7% 2 5% 6% 3 5% 5% 5% 7% 39%	1260
July	1st to 10th	Night	15% 6% 3 5% 4 3 5% 6% 7% 6% 41%	1260
	11th to 20th	Night	16% 5% 3 4 5% 3 5% 5% 7% 8% 40%	1260
	21st to end	Night	13% 5% 2 5% 5% 3 6% 5% 5% 8% 41%	1456
August	1st to 10th	Night	12% 7% 2 6% 7% 4 5% 7% 6% 8% 35%	1597
	11th to 20th	Night	16% 5% 3 4 6% 3 4 4 5% 7% 42%	1598
	21st to end	Night	20% 6% 3 6% 6% 2 4 4 5% 7% 38%	1782
September	1st to 10th	Night	17% 7% 3 6% 4 4 4 4 5% 6% 39%	1795
	11th to 20th	Night	19% 10% 2 5% 4 3 3 4 4 7% 39%	1906
	21st to end	Night	21% 8% 2 5% 4 3 5% 4 5% 6% 37%	2009
October	1st to 10th	Night	23% 11% 3 7% 4 2 3 4 4 7% 31%	2160
	11th to 20th	Night	28% 16% 5% 7% 6% 4 3 4 4 5% 18%	2160
	21st to end	Night	23% 19% 5% 8% 6% 3 4 3 4 5% 20%	2491
November	1st to 10th	Night	19% 15% 7% 8% 6% 4 4 5% 4 5% 22%	2592
	11th to 20th	Night	21% 15% 8% 12% 8% 3 4 4 4 4 16%	2660
	21st to end	Night	23% 19% 8% 11% 8% 4 5% 3 3 4 12%	2660
December	1st to 10th	Night	17% 20% 6% 13% 10% 5% 6% 4 5% 3 11%	2736
	11th to 20th	Night	17% 19% 8% 10% 11% 5% 5% 4 4 4 13%	3526
	21st to end	Night	20% 19% 10% 15% 9% 4 3 3 2 3 11%	5236

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	73% 2 7% 14% 3	1329
	11th to 20th	Day	68% 3 6% 15% 8%	1272
	21st to end	Day	67% 3 7% 14% 10%	1659
February	1st to 10th	Day	66% 4 8% 14% 8%	1620
	11th to 20th	Day	64% 3 9% 15% 9% 1	1582
	21st to end	Day	66% 2 5% 18% 8% 1	1332
March	1st to 10th	Day	61% 4 8% 14% 12% 1	1929
	11th to 20th	Day	59% 3 7% 20% 10% 1	1980
	21st to end	Day	56% 3 7% 18% 13% 3	2178
April	1st to 10th	Day	64% 4 7% 15% 11%	2142
	11th to 20th	Day	55% 3 8% 23% 10% 1	2312
	21st to end	Day	56% 2 9% 16% 14% 3	2340
May	1st to 10th	Day	54% 4 9% 18% 12% 2	2452
	11th to 20th	Day	55% 4 8% 19% 13% 1	2482
	21st to end	Day	50% 4 11% 22% 12% 2	2835
June	1st to 10th	Day	53% 4 10% 23% 9% 1	2700
	11th to 20th	Day	47% 4 11% 23% 14% 1	2700
	21st to end	Day	52% 4 12% 22% 10% 1	2700
July	1st to 10th	Day	45% 6% 15% 26% 8%	2626
	11th to 20th	Day	45% 5% 15% 26% 8%	2619
	21st to end	Day	50% 5% 15% 25% 4	2701
August	1st to 10th	Day	53% 5% 16% 21% 4	2323
	11th to 20th	Day	50% 5% 16% 22% 7% 1	2303
	21st to end	Day	51% 5% 14% 23% 7%	2561
September	1st to 10th	Day	51% 4 14% 22% 9%	2160
	11th to 20th	Day	52% 5% 17% 21% 5%	2052
	21st to end	Day	55% 4 13% 22% 5% 1	1950
October	1st to 10th	Day	58% 4 13% 18% 8%	1800
	11th to 20th	Day	71% 4 7% 14% 4	1800
	21st to end	Day	76% 4 7% 9% 4	1862
November	1st to 10th	Day	69% 3 13% 10% 4	1486
	11th to 20th	Day	77% 3 8% 9% 3	1520
	21st to end	Day	80% 3 8% 7% 2	1520
December	1st to 10th	Day	75% 2 9% 9% 4	1440
	11th to 20th	Day	69% 4 6% 17% 3	1671
	21st to end	Day	83% 2 5% 8% 2	2431
January	1st to 10th	Night	74% 4 8% 11% 2	2838
	11th to 20th	Night	70% 3 7% 13% 6%	2728
	21st to end	Night	68% 3 6% 14% 8% 1	2692
February	1st to 10th	Night	64% 3 9% 15% 9%	2340
	11th to 20th	Night	64% 3 10% 16% 8%	2275
	21st to end	Night	65% 3 8% 16% 8% 1	1920
March	1st to 10th	Night	60% 4 7% 16% 11% 2	2030
	11th to 20th	Night	64% 3 7% 15% 11% 1	1980
	21st to end	Night	53% 3 7% 17% 16% 4	2178
April	1st to 10th	Night	60% 3 6% 17% 13% 1	1824
	11th to 20th	Night	55% 3 6% 21% 14% 2	1607
	21st to end	Night	51% 3 9% 16% 19% 3	1620
May	1st to 10th	Night	50% 4 10% 21% 13% 3	1508
	11th to 20th	Night	49% 4 9% 23% 15% 1	1416
	21st to end	Night	44% 4 15% 19% 16% 3	1439
June	1st to 10th	Night	52% 3 9% 22% 12% 2	1260
	11th to 20th	Night	40% 4 13% 27% 14% 2	1260
	21st to end	Night	44% 4 15% 22% 13% 2	1260
July	1st to 10th	Night	40% 6% 14% 28% 12% 1	1225
	11th to 20th	Night	40% 5% 17% 25% 13%	1218
	21st to end	Night	43% 5% 16% 32% 5%	1375
August	1st to 10th	Night	44% 6% 18% 27% 5%	1587
	11th to 20th	Night	41% 5% 17% 28% 8% 1	1598
	21st to end	Night	47% 4 17% 24% 8% 1	1782
September	1st to 10th	Night	46% 5% 17% 23% 9% 1	1795
	11th to 20th	Night	47% 5% 18% 24% 6%	1906
	21st to end	Night	48% 4 15% 26% 6%	2009
October	1st to 10th	Night	54% 4 13% 20% 9% 1	2160
	11th to 20th	Night	69% 4 10% 14% 3	2160
	21st to end	Night	68% 3 10% 13% 5%	2491
November	1st to 10th	Night	65% 4 12% 16% 4	2592
	11th to 20th	Night	73% 3 10% 10% 4	2660
	21st to end	Night	78% 4 9% 8% 2	2660
December	1st to 10th	Night	78% 3 7% 9% 3	2736
	11th to 20th	Night	75% 3 6% 12% 4	3525
	21st to end	Night	80% 2 6% 9% 3	5236

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	25% 19% 33% 18% 4 1	180
	11th to 20th	Day	27% 13% 29% 23% 9% 1	164
	21st to end	Day	23% 10% 40% 21% 5% 1	252
February	1st to 10th	Day	21% 23% 37% 15% 3 1	240
	11th to 20th	Day	21% 23% 38% 14% 4 2	240
	21st to end	Day	26% 24% 39% 9% 2	198
March	1st to 10th	Day	21% 18% 38% 18% 4	369
	11th to 20th	Day	25% 17% 35% 17% 5%	420
	21st to end	Day	28% 17% 34% 16% 4 1	462
April	1st to 10th	Day	27% 20% 26% 20% 7% 1	420
	11th to 20th	Day	29% 15% 28% 19% 7% 2	412
	21st to end	Day	31% 15% 31% 13% 7% 3	420
May	1st to 10th	Day	24% 12% 34% 20% 9% 1	423
	11th to 20th	Day	27% 12% 33% 18% 7% 3	447
	21st to end	Day	24% 12% 34% 22% 7% 1	595
June	1st to 10th	Day	24% 10% 36% 21% 8% 1	630
	11th to 20th	Day	22% 12% 33% 24% 8% 1	630
	21st to end	Day	23% 9% 28% 27% 10% 2	630
July	1st to 10th	Day	18% 11% 33% 27% 8% 3	621
	11th to 20th	Day	17% 9% 34% 28% 11% 2	618
	21st to end	Day	18% 6% 29% 29% 12% 4	604
August	1st to 10th	Day	20% 7% 28% 27% 14% 4	446
	11th to 20th	Day	20% 6% 26% 27% 15% 7%	439
	21st to end	Day	22% 8% 28% 23% 12% 7%	495
September	1st to 10th	Day	22% 7% 32% 22% 13% 3	450
	11th to 20th	Day	26% 10% 30% 24% 8% 3	450
	21st to end	Day	30% 10% 26% 18% 14% 1	450
October	1st to 10th	Day	29% 10% 29% 22% 8% 2	450
	11th to 20th	Day	39% 12% 29% 14% 4 2	450
	21st to end	Day	35% 15% 32% 14% 3 1	386
November	1st to 10th	Day	37% 16% 36% 8% 3	180
	11th to 20th	Day	31% 17% 33% 14% 4	180
	21st to end	Day	41% 14% 33% 6% 4 1	180
December	1st to 10th	Day	24% 12% 39% 14% 8% 2	180
	11th to 20th	Day	24% 18% 38% 15% 4 1	180
	21st to end	Day	30% 15% 31% 16% 7% 2	198
January	1st to 10th	Night	25% 13% 38% 18% 6% 1	950
	11th to 20th	Night	25% 11% 34% 23% 7%	910
	21st to end	Night	19% 10% 31% 28% 11% 2	883
February	1st to 10th	Night	18% 12% 39% 23% 8%	720
	11th to 20th	Night	22% 13% 35% 25% 6%	703
	21st to end	Night	19% 17% 37% 20% 7% 1	592
March	1st to 10th	Night	19% 18% 32% 24% 6% 1	720
	11th to 20th	Night	25% 15% 33% 20% 6%	720
	21st to end	Night	21% 14% 37% 22% 6% 1	792
April	1st to 10th	Night	28% 13% 29% 24% 5% 1	720
	11th to 20th	Night	24% 15% 27% 25% 9% 1	543
	21st to end	Night	26% 9% 32% 24% 8% 1	540
May	1st to 10th	Night	22% 9% 31% 30% 8%	428
	11th to 20th	Night	23% 9% 29% 28% 9% 2	354
	21st to end	Night	20% 8% 33% 34% 5%	389
June	1st to 10th	Night	23% 8% 31% 28% 10%	360
	11th to 20th	Night	21% 6% 32% 28% 13% 1	360
	21st to end	Night	21% 5% 25% 35% 13% 1	360
July	1st to 10th	Night	18% 6% 31% 34% 10% 1	350
	11th to 20th	Night	17% 4 28% 35% 15% 1	348
	21st to end	Night	14% 3 28% 39% 15% 1	394
August	1st to 10th	Night	15% 3 31% 28% 20% 2	523
	11th to 20th	Night	18% 4 23% 33% 19% 3	534
	21st to end	Night	23% 5% 25% 29% 16% 2	594
September	1st to 10th	Night	22% 9% 27% 27% 15% 1	715
	11th to 20th	Night	25% 6% 26% 27% 13% 2	720
	21st to end	Night	26% 6% 27% 26% 13% 2	720
October	1st to 10th	Night	30% 9% 28% 25% 7% 2	720
	11th to 20th	Night	36% 12% 27% 17% 7% 1	720
	21st to end	Night	33% 9% 30% 21% 5% 1	792
November	1st to 10th	Night	26% 13% 36% 20% 5% 1	740
	11th to 20th	Night	30% 17% 30% 17% 6% 1	760
	21st to end	Night	34% 14% 33% 15% 4 1	760
December	1st to 10th	Night	28% 12% 33% 20% 6%	836
	11th to 20th	Night	27% 14% 33% 19% 6% 1	950
	21st to end	Night	30% 13% 29% 20% 7% 2	1045

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