Moosonee / Moose Factory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Moosonee / Moose Factory 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	16% 13% 4 10% 6% 5% 5% 4 5% 6% 26%	102006
	Night	14% 14% 5% 11% 7% 6% 6% 4 5% 5% 22%	97160
Transparency	Day	57% 7% 12% 18% 6%	105393
	Night	62% 6% 11% 15% 5%	101862
Seeing	Day	20% 7% 25% 31% 14% 3	15414
	Night	21% 7% 26% 32% 13% 2	24322

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	8% 19% 9% 18% 9% 9% 10% 5% 5% 4 5%	2208
	11th to 20th	Day	9% 13% 9% 21% 10% 10% 8% 5% 6% 3 7%	2210
	21st to end	Day	11% 20% 8% 16% 7% 7% 6% 5% 6% 4 11%	2563
February	1st to 10th	Day	8% 15% 6% 12% 9% 8% 8% 6% 7% 6% 15%	1648
	11th to 20th	Day	9% 17% 5% 12% 8% 7% 7% 7% 7% 6% 14%	1663
	21st to end	Day	8% 13% 5% 12% 7% 8% 9% 5% 6% 7% 19%	1413
March	1st to 10th	Day	16% 14% 4 10% 6% 7% 6% 5% 5% 5% 21%	3253
	11th to 20th	Day	10% 14% 6% 20% 7% 6% 5% 3 4 6% 19%	3480
	21st to end	Day	13% 13% 5% 13% 7% 6% 7% 5% 4 4 22%	3815
April	1st to 10th	Day	15% 16% 6% 10% 6% 5% 4 3 4 4 26%	2344
	11th to 20th	Day	16% 13% 5% 9% 6% 4 4 3 5% 6% 29%	2442
	21st to end	Day	15% 13% 5% 9% 6% 4 3 3 4 5% 34%	2470
May	1st to 10th	Day	16% 13% 4 9% 5% 6% 5% 4 4 5% 30%	4426
	11th to 20th	Day	17% 14% 3 9% 6% 5% 4 3 4 6% 29%	4607
	21st to end	Day	15% 12% 4 8% 5% 4 4 4 5% 8% 31%	5185
June	1st to 10th	Day	20% 10% 3 8% 4 4 4 3 5% 7% 33%	2850
	11th to 20th	Day	12% 8% 3 8% 5% 5% 4 4 6% 6% 39%	2850
	21st to end	Day	17% 7% 3 7% 6% 4 4 3 6% 7% 36%	2850
July	1st to 10th	Day	18% 8% 3 7% 4 3 3 4 4 6% 38%	4760
	11th to 20th	Day	19% 7% 3 7% 6% 5% 5% 4 6% 8% 31%	4760
	21st to end	Day	13% 7% 3 8% 5% 5% 5% 4 7% 9% 33%	5162
August	1st to 10th	Day	18% 9% 2 8% 5% 4 5% 4 6% 7% 32%	4433
	11th to 20th	Day	16% 8% 2 6% 4 4 4 3 6% 8% 39%	4044
	21st to end	Day	15% 7% 3 8% 4 4 4 4 5% 8% 39%	4532
September	1st to 10th	Day	20% 8% 3 7% 5% 5% 4 4 5% 6% 32%	2328
	11th to 20th	Day	22% 10% 4 8% 6% 5% 4 3 5% 6% 25%	2157
	21st to end	Day	25% 11% 4 6% 5% 4 4 3 4 5% 29%	2068
October	1st to 10th	Day	25% 16% 3 8% 4 4 3 4 4 5% 24%	1900
	11th to 20th	Day	24% 19% 4 10% 5% 4 4 3 4 6% 17%	1900
	21st to end	Day	23% 20% 5% 12% 6% 4 4 3 4 4 15%	1809
November	1st to 10th	Day	22% 25% 7% 10% 5% 4 3 2 4 4 14%	1518
	11th to 20th	Day	26% 21% 7% 12% 5% 4 3 3 4 4 12%	1520
	21st to end	Day	19% 23% 8% 13% 5% 6% 5% 3 3 3 13%	1406
December	1st to 10th	Day	12% 21% 8% 13% 8% 6% 6% 4 4 5% 14%	1330
	11th to 20th	Day	12% 18% 6% 12% 12% 7% 5% 5% 5% 5% 14%	1671
	21st to end	Day	14% 17% 6% 18% 10% 7% 5% 4 6% 5% 8%	2431
January	1st to 10th	Night	8% 19% 8% 17% 9% 9% 8% 5% 5% 3 9%	4748
	11th to 20th	Night	7% 15% 8% 20% 11% 9% 9% 5% 5% 3 7%	4760
	21st to end	Night	12% 20% 7% 13% 7% 8% 7% 5% 7% 4 11%	5104
February	1st to 10th	Night	8% 12% 5% 11% 10% 10% 10% 7% 7% 5% 15%	2531
	11th to 20th	Night	8% 17% 5% 13% 9% 8% 9% 6% 8% 3 13%	2403
	21st to end	Night	6% 14% 5% 13% 8% 7% 11% 6% 6% 6% 17%	2041
March	1st to 10th	Night	16% 14% 4 10% 7% 6% 6% 5% 5% 4 21%	3585
	11th to 20th	Night	12% 14% 6% 18% 11% 7% 5% 4 4 4 15%	3479
	21st to end	Night	11% 11% 5% 16% 9% 7% 6% 3 4 5% 23%	3817
April	1st to 10th	Night	18% 13% 3 10% 5% 4 6% 3 5% 6% 26%	1853
	11th to 20th	Night	11% 14% 6% 10% 5% 5% 4 3 5% 6% 31%	1687
	21st to end	Night	14% 14% 5% 9% 6% 5% 4 4 5% 5% 32%	1710
May	1st to 10th	Night	19% 11% 4 8% 5% 4 4 3 5% 5% 33%	2514
	11th to 20th	Night	19% 13% 4 9% 5% 4 3 4 4 7% 29%	2292
	21st to end	Night	16% 8% 4 8% 5% 4 5% 4 6% 7% 33%	2402
June	1st to 10th	Night	18% 9% 2 8% 5% 3 3 4 4 7% 37%	1330
	11th to 20th	Night	12% 8% 3 8% 5% 4 4 4 6% 8% 38%	1330
	21st to end	Night	15% 7% 2 7% 5% 4 5% 3 6% 8% 37%	1330
July	1st to 10th	Night	16% 8% 3 5% 4 5% 5% 5% 7% 8% 35%	2210
	11th to 20th	Night	16% 9% 2 6% 5% 5% 5% 3 7% 8% 35%	2210
	21st to end	Night	15% 7% 2 8% 5% 5% 5% 3 6% 7% 36%	2402
August	1st to 10th	Night	16% 10% 3 7% 4 5% 5% 4 6% 7% 32%	2496
	11th to 20th	Night	16% 7% 2 5% 4 4 4 4 6% 8% 39%	2785
	21st to end	Night	12% 6% 3 7% 4 4 4 4 5% 8% 44%	3124
September	1st to 10th	Night	21% 8% 3 6% 4 4 4 4 4 7% 35%	1833
	11th to 20th	Night	22% 11% 3 7% 4 4 4 4 4 7% 30%	2021
	21st to end	Night	20% 11% 3 6% 4 4 4 3 5% 6% 35%	2112
October	1st to 10th	Night	23% 10% 3 8% 4 5% 4 3 5% 6% 29%	2280
	11th to 20th	Night	23% 16% 4 10% 6% 5% 4 4 4 5% 18%	2280
	21st to end	Night	20% 18% 5% 12% 6% 5% 4 3 4 4 18%	2786
November	1st to 10th	Night	20% 20% 7% 13% 5% 5% 4 2 4 5% 16%	2660
	11th to 20th	Night	21% 24% 7% 10% 5% 4 4 3 3 4 15%	2660
	21st to end	Night	20% 22% 8% 14% 9% 4 3 3 3 3 10%	2773
December	1st to 10th	Night	12% 21% 8% 14% 7% 6% 5% 4 5% 5% 12%	2850
	11th to 20th	Night	10% 19% 7% 13% 8% 8% 6% 5% 5% 5% 14%	3526
	21st to end	Night	11% 20% 8% 18% 9% 6% 5% 3 4 3 12%	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	82% 4 8% 5% 1	2209
	11th to 20th	Day	78% 5% 7% 7% 2	2210
	21st to end	Day	72% 7% 7% 11% 3	2563
February	1st to 10th	Day	65% 5% 7% 17% 5%	1648
	11th to 20th	Day	65% 7% 12% 12% 4	1672
	21st to end	Day	62% 7% 11% 14% 6%	1413
March	1st to 10th	Day	62% 6% 9% 18% 5%	3256
	11th to 20th	Day	64% 7% 10% 14% 5%	3480
	21st to end	Day	60% 9% 9% 14% 8%	3815
April	1st to 10th	Day	61% 5% 8% 15% 10% 1	2344
	11th to 20th	Day	55% 7% 10% 17% 11% 1	2442
	21st to end	Day	52% 6% 9% 18% 12% 2	2470
May	1st to 10th	Day	52% 8% 10% 19% 10% 1	4440
	11th to 20th	Day	53% 8% 12% 18% 8% 1	4611
	21st to end	Day	46% 10% 12% 20% 10%	5185
June	1st to 10th	Day	51% 6% 10% 21% 12% 1	2850
	11th to 20th	Day	44% 6% 11% 24% 14% 1	2850
	21st to end	Day	46% 7% 13% 23% 11% 1	2850
July	1st to 10th	Day	47% 5% 12% 30% 7%	4686
	11th to 20th	Day	49% 6% 15% 22% 8% 1	4679
	21st to end	Day	46% 7% 20% 23% 4	4999
August	1st to 10th	Day	50% 7% 14% 24% 5%	4417
	11th to 20th	Day	44% 6% 17% 27% 5%	4083
	21st to end	Day	42% 6% 16% 30% 6%	4531
September	1st to 10th	Day	51% 9% 17% 19% 5%	2328
	11th to 20th	Day	58% 8% 16% 15% 2	2157
	21st to end	Day	57% 6% 12% 18% 7%	2068
October	1st to 10th	Day	62% 5% 14% 16% 4	3160
	11th to 20th	Day	70% 4 13% 11% 2	3140
	21st to end	Day	75% 5% 7% 10% 4	2961
November	1st to 10th	Day	74% 6% 8% 9% 2	1518
	11th to 20th	Day	77% 5% 9% 9% 1	1520
	21st to end	Day	77% 6% 7% 9% 1	1406
December	1st to 10th	Day	71% 7% 10% 11% 2	1330
	11th to 20th	Day	70% 8% 9% 11% 2	1671
	21st to end	Day	75% 8% 9% 7% 2	2431
January	1st to 10th	Night	77% 7% 9% 6% 1	4748
	11th to 20th	Night	80% 6% 7% 6% 2	4760
	21st to end	Night	72% 6% 8% 12% 2	5104
February	1st to 10th	Night	66% 5% 8% 14% 6%	2531
	11th to 20th	Night	69% 7% 10% 10% 4	2405
	21st to end	Night	63% 7% 11% 14% 5%	2041
March	1st to 10th	Night	63% 7% 8% 14% 8%	3595
	11th to 20th	Night	70% 6% 8% 11% 4	3480
	21st to end	Night	61% 7% 8% 15% 9%	3817
April	1st to 10th	Night	58% 5% 7% 19% 11% 1	1853
	11th to 20th	Night	54% 6% 8% 20% 12% 1	1687
	21st to end	Night	54% 6% 7% 16% 15% 1	1710
May	1st to 10th	Night	52% 6% 8% 23% 10% 1	2520
	11th to 20th	Night	54% 7% 12% 18% 9% 1	2293
	21st to end	Night	48% 9% 13% 19% 11% 1	2403
June	1st to 10th	Night	49% 6% 10% 22% 11% 2	1330
	11th to 20th	Night	44% 7% 11% 22% 15% 1	1330
	21st to end	Night	45% 7% 14% 20% 11% 2	1330
July	1st to 10th	Night	46% 6% 12% 30% 6%	2175
	11th to 20th	Night	48% 7% 15% 20% 8% 3	2168
	21st to end	Night	47% 7% 14% 21% 10%	2325
August	1st to 10th	Night	50% 8% 15% 24% 3	2488
	11th to 20th	Night	43% 7% 21% 26% 4	2812
	21st to end	Night	39% 5% 15% 31% 10%	3124
September	1st to 10th	Night	50% 7% 17% 20% 6%	1833
	11th to 20th	Night	52% 8% 18% 18% 4	2021
	21st to end	Night	51% 7% 13% 21% 8%	2112
October	1st to 10th	Night	57% 5% 11% 22% 5%	3800
	11th to 20th	Night	64% 5% 13% 16% 2	3779
	21st to end	Night	66% 5% 11% 15% 2	4584
November	1st to 10th	Night	73% 6% 11% 9% 2	2660
	11th to 20th	Night	73% 6% 10% 10% 2	2660
	21st to end	Night	79% 6% 8% 6% 1	2773
December	1st to 10th	Night	73% 7% 9% 9% 2	2850
	11th to 20th	Night	69% 8% 9% 10% 3	3525
	21st to end	Night	74% 7% 7% 10% 2	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	14% 8% 33% 27% 16% 2	180
	11th to 20th	Day	12% 8% 30% 32% 17% 2	180
	21st to end	Day	16% 4 21% 34% 19% 6%	236
February	1st to 10th	Day	11% 11% 27% 31% 17% 2	270
	11th to 20th	Day	13% 8% 32% 31% 14% 1	270
	21st to end	Day	18% 9% 32% 32% 8% 1	225
March	1st to 10th	Day	16% 9% 29% 30% 12% 4	355
	11th to 20th	Day	14% 7% 28% 33% 13% 5%	460
	21st to end	Day	15% 8% 32% 35% 9% 2	506
April	1st to 10th	Day	15% 7% 26% 32% 16% 4	460
	11th to 20th	Day	19% 8% 24% 32% 13% 4	452
	21st to end	Day	21% 8% 22% 29% 15% 5%	460
May	1st to 10th	Day	19% 8% 22% 31% 15% 5%	463
	11th to 20th	Day	22% 7% 27% 27% 14% 3	605
	21st to end	Day	19% 5% 26% 33% 15% 1	734
June	1st to 10th	Day	21% 4 25% 35% 12% 2	680
	11th to 20th	Day	15% 6% 28% 35% 12% 3	680
	21st to end	Day	19% 6% 22% 32% 18% 4	680
July	1st to 10th	Day	20% 5% 23% 33% 16% 3	671
	11th to 20th	Day	18% 4 22% 36% 17% 3	668
	21st to end	Day	19% 6% 18% 36% 16% 4	739
August	1st to 10th	Day	23% 5% 18% 30% 18% 5%	572
	11th to 20th	Day	19% 6% 18% 25% 26% 6%	479
	21st to end	Day	22% 6% 20% 28% 17% 6%	539
September	1st to 10th	Day	20% 7% 27% 29% 17% 1	490
	11th to 20th	Day	24% 6% 24% 32% 11% 3	490
	21st to end	Day	27% 7% 24% 24% 14% 3	490
October	1st to 10th	Day	28% 10% 26% 23% 11% 2	490
	11th to 20th	Day	34% 8% 20% 29% 7% 2	490
	21st to end	Day	29% 7% 28% 27% 10% 1	294
November	1st to 10th	Day	28% 11% 37% 20% 4	188
	11th to 20th	Day	32% 7% 29% 21% 10% 2	180
	21st to end	Day	25% 11% 36% 22% 4 2	180
December	1st to 10th	Day	21% 9% 23% 23% 19% 5%	180
	11th to 20th	Day	12% 14% 27% 31% 17% 1	180
	21st to end	Day	15% 10% 35% 24% 13% 3	198
January	1st to 10th	Night	19% 6% 29% 31% 13% 2	950
	11th to 20th	Night	17% 7% 27% 34% 14% 2	950
	21st to end	Night	14% 4 21% 35% 22% 4	1045
February	1st to 10th	Night	12% 5% 25% 40% 16% 2	821
	11th to 20th	Night	17% 4 25% 36% 16% 1	743
	21st to end	Night	13% 6% 25% 36% 18% 2	628
March	1st to 10th	Night	14% 7% 29% 33% 15% 2	760
	11th to 20th	Night	16% 8% 31% 31% 12% 1	760
	21st to end	Night	15% 6% 28% 37% 13% 1	836
April	1st to 10th	Night	24% 6% 25% 31% 13% 1	689
	11th to 20th	Night	18% 5% 23% 38% 14% 2	563
	21st to end	Night	21% 6% 27% 31% 11% 3	570
May	1st to 10th	Night	20% 4 27% 31% 15% 2	380
	11th to 20th	Night	21% 9% 25% 32% 11% 2	374
	21st to end	Night	19% 7% 25% 37% 11% 1	411
June	1st to 10th	Night	20% 6% 23% 36% 13% 2	380
	11th to 20th	Night	14% 4 25% 38% 18% 1	380
	21st to end	Night	17% 3 22% 38% 18% 1	380
July	1st to 10th	Night	20% 4 20% 38% 16% 2	370
	11th to 20th	Night	17% 3 20% 44% 15% 1	368
	21st to end	Night	18% 3 13% 42% 21% 3	416
August	1st to 10th	Night	23% 4 14% 33% 24% 2	450
	11th to 20th	Night	20% 3 20% 35% 19% 2	564
	21st to end	Night	19% 4 20% 37% 19% 2	627
September	1st to 10th	Night	26% 6% 23% 32% 13% 1	693
	11th to 20th	Night	27% 6% 25% 31% 11% 1	760
	21st to end	Night	25% 6% 26% 29% 12% 2	760
October	1st to 10th	Night	28% 8% 29% 25% 9% 1	760
	11th to 20th	Night	30% 8% 29% 22% 8% 3	760
	21st to end	Night	28% 9% 26% 26% 9% 1	836
November	1st to 10th	Night	27% 11% 32% 21% 7% 1	760
	11th to 20th	Night	31% 11% 28% 22% 7% 1	760
	21st to end	Night	29% 10% 32% 22% 7% 1	873
December	1st to 10th	Night	21% 10% 29% 27% 11% 2	950
	11th to 20th	Night	17% 9% 27% 30% 14% 2	950
	21st to end	Night	20% 7% 27% 31% 11% 4	1045

Page generated at 2024-11-03 02:11:10. Version ac07

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