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 2024-11-05.

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	17% 12% 4 9% 5% 5% 5% 3 5% 6% 28%	101813
	Night	16% 14% 5% 10% 6% 5% 4 3 5% 5% 26%	97299
Transparency	Day	57% 3 11% 20% 8% 1	105293
	Night	60% 3 10% 18% 8% 1	101908
Seeing	Day	25% 12% 32% 21% 8% 2	15264
	Night	24% 11% 31% 24% 9% 1	24238

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	14% 21% 10% 13% 6% 8% 6% 4 5% 4 10%	2208
	11th to 20th	Day	11% 14% 7% 16% 11% 5% 6% 4 5% 5% 16%	2210
	21st to end	Day	13% 22% 9% 14% 6% 5% 4 3 5% 5% 14%	2908
February	1st to 10th	Day	7% 17% 6% 12% 8% 8% 7% 5% 5% 6% 18%	1710
	11th to 20th	Day	9% 19% 7% 11% 7% 6% 5% 5% 4 6% 20%	1663
	21st to end	Day	11% 19% 6% 11% 7% 6% 5% 3 3 5% 23%	1413
March	1st to 10th	Day	17% 15% 4 10% 6% 4 5% 3 5% 5% 25%	3357
	11th to 20th	Day	11% 19% 6% 16% 6% 4 3 3 3 4 25%	3480
	21st to end	Day	12% 16% 6% 11% 6% 5% 5% 3 4 5% 28%	3815
April	1st to 10th	Day	20% 16% 5% 11% 5% 4 3 3 5% 6% 23%	2262
	11th to 20th	Day	20% 13% 4 8% 5% 4 4 3 4 5% 30%	2442
	21st to end	Day	20% 13% 3 7% 5% 4 4 3 4 5% 32%	2470
May	1st to 10th	Day	19% 12% 3 8% 5% 4 4 3 5% 7% 31%	4317
	11th to 20th	Day	16% 9% 3 8% 5% 5% 4 4 6% 7% 33%	4398
	21st to end	Day	19% 8% 2 6% 5% 4 4 4 5% 7% 36%	5045
June	1st to 10th	Day	20% 9% 3 7% 5% 5% 5% 4 6% 7% 29%	2850
	11th to 20th	Day	16% 7% 3 7% 5% 5% 5% 4 6% 8% 35%	2850
	21st to end	Day	20% 8% 2 7% 5% 4 6% 4 7% 7% 30%	2850
July	1st to 10th	Day	17% 8% 3 7% 5% 5% 5% 4 7% 8% 31%	4760
	11th to 20th	Day	14% 7% 2 6% 5% 4 5% 4 6% 8% 37%	4760
	21st to end	Day	16% 7% 3 6% 4 4 5% 4 6% 8% 36%	5014
August	1st to 10th	Day	15% 6% 3 7% 5% 5% 5% 4 6% 8% 35%	4114
	11th to 20th	Day	18% 8% 3 7% 4 4 5% 4 6% 7% 35%	4044
	21st to end	Day	16% 6% 3 7% 4 4 5% 4 6% 8% 38%	4505
September	1st to 10th	Day	21% 7% 2 7% 5% 4 5% 3 6% 7% 33%	2280
	11th to 20th	Day	22% 8% 2 7% 4 4 4 3 5% 7% 33%	2166
	21st to end	Day	24% 10% 3 6% 5% 4 3 3 5% 6% 31%	2058
October	1st to 10th	Day	22% 12% 3 8% 5% 3 4 3 5% 6% 29%	1900
	11th to 20th	Day	28% 19% 4 7% 5% 4 3 2 4 5% 18%	1900
	21st to end	Day	27% 22% 5% 9% 6% 4 4 3 3 4 14%	1964
November	1st to 10th	Day	23% 21% 6% 8% 4 4 3 2 4 5% 19%	1518
	11th to 20th	Day	20% 20% 6% 15% 8% 5% 3 3 4 4 12%	1520
	21st to end	Day	23% 20% 8% 15% 5% 5% 3 3 4 3 10%	1520
December	1st to 10th	Day	18% 21% 8% 15% 5% 4 4 2 5% 4 14%	1440
	11th to 20th	Day	16% 17% 7% 14% 7% 5% 5% 4 4 4 18%	1671
	21st to end	Day	17% 22% 10% 20% 7% 4 4 2 3 3 9%	2431
January	1st to 10th	Night	13% 17% 8% 16% 8% 7% 6% 4 5% 5% 12%	4748
	11th to 20th	Night	11% 17% 6% 16% 8% 7% 7% 4 5% 4 16%	4760
	21st to end	Night	11% 21% 10% 14% 7% 7% 5% 3 4 4 14%	4748
February	1st to 10th	Night	10% 16% 5% 11% 9% 6% 6% 4 6% 7% 19%	2470
	11th to 20th	Night	11% 16% 6% 12% 7% 6% 6% 3 4 6% 22%	2403
	21st to end	Night	10% 16% 6% 14% 8% 6% 6% 4 5% 6% 20%	2036
March	1st to 10th	Night	17% 15% 4 9% 5% 4 4 2 4 6% 31%	3482
	11th to 20th	Night	13% 17% 7% 14% 8% 6% 4 3 3 5% 22%	3479
	21st to end	Night	13% 13% 6% 12% 5% 5% 4 3 4 4 29%	3817
April	1st to 10th	Night	19% 16% 4 10% 5% 4 3 3 5% 5% 27%	1925
	11th to 20th	Night	19% 11% 3 8% 6% 5% 4 3 5% 6% 31%	1697
	21st to end	Night	19% 11% 3 6% 4 4 4 3 5% 5% 36%	1710
May	1st to 10th	Night	20% 11% 3 8% 4 5% 5% 3 4 4 33%	2624
	11th to 20th	Night	14% 8% 3 6% 5% 5% 5% 3 6% 8% 38%	2495
	21st to end	Night	15% 8% 3 6% 3 4 5% 5% 6% 8% 37%	2535
June	1st to 10th	Night	21% 9% 3 6% 3 5% 4 4 6% 7% 31%	1330
	11th to 20th	Night	17% 6% 2 5% 3 3 4 4 5% 7% 42%	1330
	21st to end	Night	16% 8% 2 6% 5% 4 5% 4 5% 7% 37%	1330
July	1st to 10th	Night	16% 8% 3 6% 4 4 4 4 6% 5% 40%	2210
	11th to 20th	Night	16% 7% 2 7% 5% 5% 5% 4 6% 8% 35%	2210
	21st to end	Night	16% 6% 2 6% 4 3 5% 3 5% 7% 42%	2543
August	1st to 10th	Night	10% 6% 2 7% 5% 5% 5% 5% 7% 8% 42%	2811
	11th to 20th	Night	16% 7% 3 6% 5% 4 5% 4 5% 6% 39%	2785
	21st to end	Night	16% 6% 2 7% 5% 3 3 3 4 6% 46%	3124
September	1st to 10th	Night	18% 7% 3 6% 4 5% 4 3 5% 6% 39%	1895
	11th to 20th	Night	18% 10% 2 6% 3 3 4 3 4 7% 40%	2012
	21st to end	Night	21% 9% 2 6% 3 4 4 3 4 6% 38%	2121
October	1st to 10th	Night	22% 12% 2 8% 4 3 4 3 5% 6% 31%	2280
	11th to 20th	Night	27% 17% 4 8% 5% 5% 3 3 4 5% 19%	2280
	21st to end	Night	23% 19% 4 9% 5% 4 4 3 4 5% 20%	2631
November	1st to 10th	Night	19% 16% 6% 9% 6% 4 5% 3 5% 5% 22%	2660
	11th to 20th	Night	21% 18% 6% 14% 7% 5% 3 3 4 4 16%	2660
	21st to end	Night	23% 20% 7% 13% 7% 5% 4 2 4 4 12%	2660
December	1st to 10th	Night	16% 21% 6% 15% 8% 7% 5% 4 4 3 11%	2736
	11th to 20th	Night	16% 20% 7% 12% 9% 6% 5% 3 5% 4 13%	3526
	21st to end	Night	20% 19% 9% 17% 7% 4 3 2 3 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	78% 2 9% 9% 2	2209
	11th to 20th	Day	70% 3 7% 16% 5%	2210
	21st to end	Day	74% 2 8% 11% 6%	2908
February	1st to 10th	Day	65% 4 9% 14% 7%	1710
	11th to 20th	Day	64% 3 8% 15% 9%	1672
	21st to end	Day	65% 2 5% 18% 9% 1	1413
March	1st to 10th	Day	61% 3 9% 18% 8%	3360
	11th to 20th	Day	65% 2 8% 18% 7% 1	3480
	21st to end	Day	59% 4 7% 17% 11% 2	3815
April	1st to 10th	Day	63% 3 7% 16% 11%	2262
	11th to 20th	Day	56% 3 8% 22% 10% 1	2442
	21st to end	Day	57% 2 9% 16% 14% 2	2470
May	1st to 10th	Day	52% 5% 9% 21% 12% 1	4330
	11th to 20th	Day	49% 4 14% 23% 10% 1	4402
	21st to end	Day	48% 4 11% 19% 15% 3	5045
June	1st to 10th	Day	53% 4 10% 23% 9% 1	2850
	11th to 20th	Day	47% 4 11% 23% 14% 1	2850
	21st to end	Day	52% 4 12% 21% 10% 1	2850
July	1st to 10th	Day	50% 3 16% 24% 6%	4686
	11th to 20th	Day	43% 3 18% 26% 9%	4679
	21st to end	Day	46% 3 11% 33% 6%	4855
August	1st to 10th	Day	47% 3 15% 28% 6%	4100
	11th to 20th	Day	49% 4 12% 28% 6% 1	4083
	21st to end	Day	46% 3 12% 30% 8% 2	4505
September	1st to 10th	Day	51% 4 14% 22% 9%	2280
	11th to 20th	Day	50% 5% 18% 23% 5%	2166
	21st to end	Day	55% 4 12% 22% 7% 1	2058
October	1st to 10th	Day	61% 2 10% 20% 7%	3160
	11th to 20th	Day	62% 2 11% 19% 7%	3140
	21st to end	Day	71% 2 13% 7% 7%	3203
November	1st to 10th	Day	69% 3 13% 10% 5%	1518
	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% 3 13% 8% 1	4748
	11th to 20th	Night	71% 3 7% 15% 4	4760
	21st to end	Night	76% 2 6% 11% 4	4748
February	1st to 10th	Night	63% 3 10% 15% 8%	2470
	11th to 20th	Night	65% 3 10% 15% 7%	2405
	21st to end	Night	65% 3 8% 15% 8% 1	2036
March	1st to 10th	Night	57% 3 10% 17% 11% 2	3492
	11th to 20th	Night	68% 4 7% 13% 8% 1	3480
	21st to end	Night	58% 4 6% 15% 13% 4	3817
April	1st to 10th	Night	59% 3 6% 18% 13% 1	1925
	11th to 20th	Night	55% 3 6% 21% 14% 2	1697
	21st to end	Night	51% 2 9% 17% 19% 2	1710
May	1st to 10th	Night	53% 5% 8% 19% 14% 2	2630
	11th to 20th	Night	44% 4 14% 27% 11% 1	2496
	21st to end	Night	44% 6% 13% 20% 15% 3	2536
June	1st to 10th	Night	53% 4 9% 22% 12% 2	1330
	11th to 20th	Night	41% 4 12% 26% 14% 2	1330
	21st to end	Night	46% 4 14% 22% 13% 2	1330
July	1st to 10th	Night	44% 3 14% 29% 9% 1	2175
	11th to 20th	Night	48% 3 16% 24% 10%	2168
	21st to end	Night	43% 3 14% 31% 9%	2462
August	1st to 10th	Night	39% 4 15% 34% 7%	2801
	11th to 20th	Night	46% 3 14% 32% 5%	2812
	21st to end	Night	42% 2 14% 30% 11% 1	3124
September	1st to 10th	Night	46% 4 16% 24% 9% 1	1895
	11th to 20th	Night	45% 4 18% 25% 7%	2012
	21st to end	Night	48% 4 15% 26% 8%	2121
October	1st to 10th	Night	54% 2 10% 24% 9%	3800
	11th to 20th	Night	61% 3 10% 21% 4	3779
	21st to end	Night	63% 3 14% 13% 6%	4342
November	1st to 10th	Night	65% 4 12% 16% 4	2660
	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	26% 13% 31% 22% 8% 1	180
	21st to end	Day	23% 9% 40% 22% 5% 1	283
February	1st to 10th	Day	21% 22% 38% 16% 3 1	270
	11th to 20th	Day	19% 22% 40% 14% 4 1	270
	21st to end	Day	28% 22% 39% 9% 2	225
March	1st to 10th	Day	21% 17% 40% 18% 4	407
	11th to 20th	Day	26% 16% 35% 18% 4	460
	21st to end	Day	28% 16% 35% 15% 4 1	506
April	1st to 10th	Day	27% 20% 26% 18% 7% 2	460
	11th to 20th	Day	31% 15% 29% 18% 6% 2	452
	21st to end	Day	32% 16% 30% 12% 7% 2	460
May	1st to 10th	Day	25% 12% 33% 20% 9% 1	463
	11th to 20th	Day	26% 11% 34% 19% 7% 3	487
	21st to end	Day	24% 12% 34% 23% 7% 1	646
June	1st to 10th	Day	24% 10% 37% 21% 7% 1	680
	11th to 20th	Day	21% 13% 34% 23% 8% 1	680
	21st to end	Day	24% 9% 29% 26% 10% 2	680
July	1st to 10th	Day	18% 11% 33% 27% 8% 2	671
	11th to 20th	Day	16% 10% 34% 28% 10% 2	668
	21st to end	Day	19% 6% 30% 30% 12% 4	654
August	1st to 10th	Day	20% 8% 28% 28% 13% 3	486
	11th to 20th	Day	20% 7% 25% 26% 15% 7%	479
	21st to end	Day	22% 8% 28% 23% 12% 7%	539
September	1st to 10th	Day	23% 8% 32% 21% 13% 3	490
	11th to 20th	Day	24% 9% 29% 25% 10% 4	490
	21st to end	Day	29% 10% 26% 20% 14% 1	490
October	1st to 10th	Day	29% 11% 28% 22% 8% 2	490
	11th to 20th	Day	37% 13% 30% 14% 4 2	490
	21st to end	Day	35% 16% 32% 14% 2 1	422
November	1st to 10th	Day	36% 16% 36% 9% 3	188
	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% 12% 35% 22% 6%	950
	21st to end	Night	19% 10% 31% 27% 11% 2	932
February	1st to 10th	Night	19% 12% 38% 23% 8%	760
	11th to 20th	Night	22% 13% 35% 25% 5%	743
	21st to end	Night	20% 17% 37% 19% 7%	628
March	1st to 10th	Night	19% 17% 33% 23% 6% 1	760
	11th to 20th	Night	25% 15% 33% 20% 6%	760
	21st to end	Night	21% 14% 37% 22% 6% 1	836
April	1st to 10th	Night	28% 13% 29% 23% 5% 1	760
	11th to 20th	Night	24% 15% 27% 25% 8% 1	573
	21st to end	Night	26% 9% 33% 24% 8% 1	570
May	1st to 10th	Night	22% 9% 31% 30% 8%	451
	11th to 20th	Night	23% 9% 30% 27% 9% 2	374
	21st to end	Night	20% 9% 33% 34% 5%	411
June	1st to 10th	Night	24% 7% 30% 29% 9%	380
	11th to 20th	Night	21% 7% 32% 27% 12% 1	380
	21st to end	Night	21% 4 26% 35% 12% 1	380
July	1st to 10th	Night	18% 6% 29% 35% 10% 1	370
	11th to 20th	Night	16% 4 29% 35% 15% 1	368
	21st to end	Night	14% 3 28% 39% 14% 1	416
August	1st to 10th	Night	15% 3 31% 29% 20% 2	553
	11th to 20th	Night	19% 4 23% 32% 20% 3	564
	21st to end	Night	22% 5% 25% 30% 16% 2	627
September	1st to 10th	Night	23% 9% 26% 27% 14% 1	755
	11th to 20th	Night	24% 6% 25% 29% 14% 2	760
	21st to end	Night	26% 6% 26% 27% 13% 1	760
October	1st to 10th	Night	29% 9% 29% 25% 7% 1	760
	11th to 20th	Night	36% 11% 28% 18% 7% 1	760
	21st to end	Night	33% 10% 31% 20% 5% 1	836
November	1st to 10th	Night	26% 12% 35% 20% 5% 1	760
	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

Page generated at 2024-11-03 02:11:14. Version ac07

Copyright © 2024 Attilla Danko.