Moosomin
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Moosomin clear sky chart from 2005-11-06 to 2024-02-05.

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	11% 8% 4 8% 7% 4 5% 6% 6% 7% 35%	77786
	Night	9% 9% 4 8% 7% 4 5% 5% 6% 7% 36%	81062
Transparency	Day	46% 7% 14% 23% 9% 1	77502
	Night	46% 6% 14% 23% 10% 1	80927
Seeing	Day	14% 9% 31% 28% 14% 3	15110
	Night	13% 9% 33% 32% 12% 1	25264

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	6% 12% 8% 13% 9% 6% 5% 5% 6% 7% 21%	2255
	11th to 20th	Day	4 7% 5% 11% 12% 7% 10% 13% 8% 8% 15%	2516
	21st to end	Day	8% 9% 6% 10% 8% 5% 6% 6% 5% 6% 31%	2794
February	1st to 10th	Day	8% 13% 4 12% 9% 5% 7% 6% 6% 6% 25%	1472
	11th to 20th	Day	7% 11% 6% 11% 9% 5% 7% 6% 5% 7% 25%	1591
	21st to end	Day	7% 9% 6% 12% 10% 4 6% 7% 6% 8% 25%	1480
March	1st to 10th	Day	11% 13% 7% 12% 10% 5% 7% 5% 4 5% 20%	1800
	11th to 20th	Day	9% 11% 5% 9% 8% 4 6% 5% 5% 7% 30%	1866
	21st to end	Day	11% 12% 5% 10% 8% 4 5% 5% 7% 7% 26%	2322
April	1st to 10th	Day	8% 10% 5% 7% 7% 4 5% 5% 5% 8% 37%	2160
	11th to 20th	Day	15% 13% 5% 8% 6% 3 5% 5% 5% 7% 28%	2258
	21st to end	Day	13% 9% 3 6% 6% 3 5% 5% 6% 8% 35%	2340
May	1st to 10th	Day	13% 8% 3 7% 5% 3 5% 5% 6% 6% 39%	2515
	11th to 20th	Day	14% 8% 3 6% 5% 3 5% 6% 5% 7% 37%	2517
	21st to end	Day	21% 8% 3 6% 6% 3 4 5% 6% 8% 30%	2918
June	1st to 10th	Day	14% 6% 2 5% 5% 3 6% 5% 6% 8% 40%	2700
	11th to 20th	Day	18% 6% 3 6% 6% 3 5% 5% 8% 8% 32%	2700
	21st to end	Day	12% 5% 2 6% 5% 3 6% 6% 7% 9% 38%	2700
July	1st to 10th	Day	7% 4 2 5% 6% 3 6% 5% 7% 9% 47%	2700
	11th to 20th	Day	9% 5% 2 5% 5% 3 5% 5% 6% 9% 45%	2629
	21st to end	Day	7% 4 1 4 5% 3 5% 6% 7% 9% 50%	2742
August	1st to 10th	Day	10% 4 2 5% 5% 3 5% 5% 7% 8% 46%	2507
	11th to 20th	Day	11% 5% 1 5% 4 3 4 6% 5% 9% 47%	2406
	21st to end	Day	11% 5% 2 4 3 3 3 6% 6% 8% 50%	2517
September	1st to 10th	Day	11% 6% 2 4 5% 3 4 5% 5% 8% 48%	2160
	11th to 20th	Day	14% 6% 2 5% 5% 3 4 4 5% 7% 44%	2048
	21st to end	Day	14% 6% 3 4 5% 3 4 4 4 7% 46%	1980
October	1st to 10th	Day	15% 11% 4 7% 6% 3 4 5% 5% 5% 35%	1918
	11th to 20th	Day	12% 11% 4 7% 5% 3 4 4 5% 8% 39%	1625
	21st to end	Day	13% 13% 5% 11% 6% 3 4 5% 6% 6% 28%	1782
November	1st to 10th	Day	17% 13% 5% 10% 6% 4 4 4 4 5% 27%	1673
	11th to 20th	Day	9% 14% 5% 11% 10% 4 5% 4 4 7% 26%	1414
	21st to end	Day	8% 14% 6% 10% 7% 4 6% 5% 5% 6% 27%	1330
December	1st to 10th	Day	6% 11% 7% 11% 10% 6% 7% 6% 5% 7% 24%	1330
	11th to 20th	Day	9% 15% 8% 14% 8% 4 6% 7% 5% 5% 18%	1679
	21st to end	Day	5% 6% 4 8% 7% 3 5% 5% 4 7% 46%	2442
January	1st to 10th	Night	6% 11% 7% 15% 9% 5% 5% 4 5% 7% 25%	4696
	11th to 20th	Night	5% 8% 4 12% 13% 7% 10% 9% 7% 7% 17%	4392
	21st to end	Night	7% 11% 6% 12% 9% 4 5% 5% 6% 7% 29%	4873
February	1st to 10th	Night	9% 9% 5% 10% 9% 5% 6% 7% 6% 8% 27%	2583
	11th to 20th	Night	6% 10% 5% 8% 8% 5% 7% 6% 7% 7% 31%	2274
	21st to end	Night	6% 9% 5% 9% 7% 5% 5% 5% 6% 8% 34%	1776
March	1st to 10th	Night	10% 11% 7% 10% 8% 4 6% 6% 6% 7% 26%	2160
	11th to 20th	Night	6% 9% 5% 8% 7% 5% 6% 5% 5% 9% 36%	2091
	21st to end	Night	10% 10% 6% 9% 7% 4 6% 4 6% 7% 32%	2030
April	1st to 10th	Night	4 9% 4 7% 6% 3 4 5% 5% 8% 45%	1800
	11th to 20th	Night	14% 12% 4 8% 6% 3 5% 4 6% 7% 32%	1653
	21st to end	Night	15% 7% 3 6% 5% 3 5% 5% 6% 7% 37%	1620
May	1st to 10th	Night	12% 7% 2 5% 5% 3 6% 4 7% 9% 41%	1441
	11th to 20th	Night	12% 6% 2 6% 6% 3 6% 5% 6% 7% 41%	1377
	21st to end	Night	20% 6% 2 4 5% 2 5% 5% 6% 8% 37%	1358
June	1st to 10th	Night	14% 5% 3 4 6% 3 4 5% 6% 6% 45%	1260
	11th to 20th	Night	15% 4 2 5% 5% 3 6% 5% 5% 10% 41%	1260
	21st to end	Night	12% 5% 2 4 5% 4 5% 5% 7% 8% 44%	1260
July	1st to 10th	Night	8% 4 1 3 4 3 4 4 5% 8% 56%	1260
	11th to 20th	Night	6% 3 1 4 3 2 4 6% 5% 8% 57%	1327
	21st to end	Night	4 2 1 3 3 3 3 4 6% 8% 62%	1576
August	1st to 10th	Night	5% 4 2 4 4 3 4 5% 6% 9% 55%	1432
	11th to 20th	Night	5% 4 2 5% 5% 3 4 4 6% 8% 54%	1495
	21st to end	Night	9% 3 1 3 4 2 3 4 6% 8% 57%	1836
September	1st to 10th	Night	10% 4 2 5% 5% 2 4 4 6% 7% 53%	1800
	11th to 20th	Night	12% 5% 2 4 4 3 4 4 6% 8% 46%	1912
	21st to end	Night	14% 7% 3 4 5% 3 5% 4 6% 7% 43%	1980
October	1st to 10th	Night	13% 12% 3 5% 5% 2 3 4 4 6% 42%	2040
	11th to 20th	Night	11% 8% 4 6% 5% 3 4 5% 5% 7% 42%	2317
	21st to end	Night	11% 11% 5% 9% 6% 3 5% 5% 4 6% 34%	2574
November	1st to 10th	Night	13% 12% 5% 9% 6% 3 5% 4 5% 6% 31%	2405
	11th to 20th	Night	8% 11% 6% 12% 10% 4 5% 4 5% 6% 29%	2761
	21st to end	Night	9% 11% 6% 9% 7% 4 5% 5% 5% 8% 30%	2850
December	1st to 10th	Night	7% 9% 5% 11% 10% 6% 7% 6% 5% 7% 27%	2850
	11th to 20th	Night	8% 14% 6% 14% 9% 5% 5% 5% 5% 6% 21%	3518
	21st to end	Night	6% 8% 4 8% 7% 3 5% 5% 6% 7% 41%	5225

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	60% 7% 14% 13% 5%	2255
	11th to 20th	Day	61% 7% 14% 14% 4	2540
	21st to end	Day	51% 7% 10% 26% 6%	2794
February	1st to 10th	Day	58% 4 13% 17% 7%	1472
	11th to 20th	Day	56% 5% 11% 18% 9% 1	1599
	21st to end	Day	55% 4 13% 18% 10%	1480
March	1st to 10th	Day	65% 6% 12% 11% 6%	1800
	11th to 20th	Day	52% 7% 14% 20% 8%	1868
	21st to end	Day	54% 7% 14% 18% 6%	2322
April	1st to 10th	Day	44% 7% 14% 23% 12%	2160
	11th to 20th	Day	54% 5% 12% 18% 9% 1	2258
	21st to end	Day	46% 6% 16% 23% 8%	2340
May	1st to 10th	Day	44% 5% 12% 26% 12% 1	2515
	11th to 20th	Day	44% 7% 11% 26% 12% 1	2521
	21st to end	Day	50% 7% 13% 20% 9% 1	2918
June	1st to 10th	Day	40% 8% 18% 24% 8% 2	2700
	11th to 20th	Day	47% 8% 16% 19% 9% 1	2700
	21st to end	Day	40% 9% 17% 27% 7% 1	2700
July	1st to 10th	Day	30% 8% 20% 32% 9% 1	2626
	11th to 20th	Day	35% 8% 18% 27% 11% 1	2548
	21st to end	Day	28% 8% 20% 33% 11% 1	2590
August	1st to 10th	Day	34% 7% 18% 28% 11% 1	2491
	11th to 20th	Day	33% 8% 19% 32% 7% 1	2406
	21st to end	Day	31% 7% 15% 35% 11% 1	2517
September	1st to 10th	Day	33% 6% 15% 32% 13% 1	2160
	11th to 20th	Day	40% 7% 15% 27% 11% 1	2048
	21st to end	Day	38% 4 14% 31% 12%	1980
October	1st to 10th	Day	50% 6% 12% 24% 7%	1918
	11th to 20th	Day	45% 4 14% 26% 10%	1625
	21st to end	Day	56% 4 14% 19% 6%	1782
November	1st to 10th	Day	59% 5% 11% 17% 7% 1	1673
	11th to 20th	Day	58% 6% 15% 13% 7% 1	1414
	21st to end	Day	56% 7% 14% 17% 6%	1330
December	1st to 10th	Day	58% 7% 13% 17% 6%	1330
	11th to 20th	Day	66% 7% 12% 12% 3	1680
	21st to end	Day	38% 6% 8% 28% 16% 3	2442
January	1st to 10th	Night	59% 5% 11% 18% 7%	4696
	11th to 20th	Night	60% 8% 14% 14% 4	4430
	21st to end	Night	53% 7% 14% 20% 6%	4873
February	1st to 10th	Night	52% 5% 13% 20% 9% 1	2583
	11th to 20th	Night	49% 5% 13% 20% 12% 1	2276
	21st to end	Night	46% 6% 12% 23% 13%	1776
March	1st to 10th	Night	56% 6% 12% 20% 6%	2160
	11th to 20th	Night	45% 5% 14% 27% 8% 1	2091
	21st to end	Night	51% 6% 15% 18% 9% 1	2030
April	1st to 10th	Night	37% 6% 11% 26% 19% 1	1800
	11th to 20th	Night	52% 5% 10% 20% 12% 1	1653
	21st to end	Night	45% 5% 14% 23% 12% 1	1620
May	1st to 10th	Night	40% 6% 13% 23% 17% 1	1441
	11th to 20th	Night	40% 7% 12% 23% 16% 1	1377
	21st to end	Night	44% 6% 14% 23% 12% 1	1358
June	1st to 10th	Night	38% 7% 16% 25% 12% 2	1260
	11th to 20th	Night	39% 7% 19% 20% 13% 2	1260
	21st to end	Night	37% 8% 19% 29% 7% 1	1260
July	1st to 10th	Night	26% 6% 20% 33% 15% 1	1225
	11th to 20th	Night	24% 9% 19% 35% 13% 1	1285
	21st to end	Night	21% 6% 19% 36% 15% 3	1488
August	1st to 10th	Night	25% 7% 19% 34% 13% 1	1424
	11th to 20th	Night	28% 7% 18% 36% 10% 2	1495
	21st to end	Night	25% 7% 14% 37% 16% 1	1836
September	1st to 10th	Night	30% 5% 13% 34% 17% 2	1800
	11th to 20th	Night	35% 8% 15% 28% 13% 1	1912
	21st to end	Night	40% 5% 12% 30% 12% 1	1980
October	1st to 10th	Night	43% 5% 18% 23% 9% 1	2040
	11th to 20th	Night	41% 6% 14% 28% 11% 1	2317
	21st to end	Night	50% 5% 14% 22% 8%	2574
November	1st to 10th	Night	54% 5% 13% 19% 8% 2	2405
	11th to 20th	Night	56% 7% 13% 18% 6% 1	2761
	21st to end	Night	50% 8% 17% 18% 6%	2850
December	1st to 10th	Night	55% 5% 14% 17% 7% 1	2850
	11th to 20th	Night	62% 6% 12% 13% 6% 1	3516
	21st to end	Night	41% 6% 11% 22% 16% 5%	5225

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	12% 10% 31% 31% 13% 4	270
	11th to 20th	Day	7% 10% 39% 33% 10% 1	270
	21st to end	Day	17% 11% 29% 31% 11% 1	297
February	1st to 10th	Day	13% 11% 38% 29% 10%	252
	11th to 20th	Day	12% 8% 39% 30% 10% 2	240
	21st to end	Day	8% 4 34% 33% 18% 4	198
March	1st to 10th	Day	16% 7% 35% 29% 11% 2	240
	11th to 20th	Day	14% 10% 30% 29% 14% 3	240
	21st to end	Day	17% 7% 34% 25% 14% 2	408
April	1st to 10th	Day	14% 15% 37% 27% 6% 1	420
	11th to 20th	Day	22% 12% 29% 27% 10% 1	536
	21st to end	Day	17% 9% 32% 26% 14% 1	600
May	1st to 10th	Day	13% 10% 29% 31% 15% 2	603
	11th to 20th	Day	17% 10% 28% 25% 16% 5%	625
	21st to end	Day	19% 8% 26% 27% 15% 4	679
June	1st to 10th	Day	15% 10% 30% 27% 14% 4	630
	11th to 20th	Day	18% 9% 32% 25% 12% 3	630
	21st to end	Day	11% 9% 28% 31% 17% 4	630
July	1st to 10th	Day	11% 7% 26% 34% 17% 5%	621
	11th to 20th	Day	9% 11% 30% 28% 17% 4	618
	21st to end	Day	5% 7% 28% 37% 17% 7%	684
August	1st to 10th	Day	11% 5% 25% 35% 17% 6%	626
	11th to 20th	Day	12% 7% 24% 27% 23% 7%	615
	21st to end	Day	13% 5% 26% 33% 19% 4	636
September	1st to 10th	Day	14% 10% 37% 25% 12% 2	450
	11th to 20th	Day	18% 10% 27% 31% 12% 1	338
	21st to end	Day	21% 10% 29% 29% 11% 1	270
October	1st to 10th	Day	19% 11% 28% 25% 14% 3	270
	11th to 20th	Day	17% 12% 36% 23% 7% 4	270
	21st to end	Day	21% 10% 37% 24% 6% 2	297
November	1st to 10th	Day	26% 10% 31% 18% 11% 3	270
	11th to 20th	Day	16% 15% 37% 24% 7% 1	270
	21st to end	Day	17% 15% 38% 24% 6% 1	270
December	1st to 10th	Day	10% 10% 40% 24% 12% 4	270
	11th to 20th	Day	16% 11% 46% 19% 7% 1	270
	21st to end	Day	9% 8% 40% 25% 13% 4	297
January	1st to 10th	Night	10% 12% 39% 31% 8% 1	950
	11th to 20th	Night	13% 13% 36% 30% 8% 1	950
	21st to end	Night	11% 12% 41% 28% 8% 1	1045
February	1st to 10th	Night	12% 9% 38% 27% 11% 2	923
	11th to 20th	Night	11% 9% 38% 29% 9% 3	791
	21st to end	Night	9% 7% 29% 38% 15% 3	592
March	1st to 10th	Night	15% 9% 31% 31% 11% 2	720
	11th to 20th	Night	10% 6% 38% 30% 14% 2	651
	21st to end	Night	15% 6% 31% 31% 14% 3	594
April	1st to 10th	Night	8% 9% 35% 37% 10% 1	540
	11th to 20th	Night	20% 9% 31% 32% 7% 1	533
	21st to end	Night	19% 6% 32% 33% 10% 1	540
May	1st to 10th	Night	15% 7% 27% 38% 12% 1	540
	11th to 20th	Night	14% 6% 28% 37% 15%	531
	21st to end	Night	23% 5% 25% 33% 14% 1	584
June	1st to 10th	Night	16% 5% 31% 33% 14% 1	540
	11th to 20th	Night	18% 3 34% 30% 14% 1	540
	21st to end	Night	14% 4 26% 38% 17% 1	540
July	1st to 10th	Night	9% 3 26% 42% 19%	525
	11th to 20th	Night	7% 5% 34% 39% 16% 1	522
	21st to end	Night	4 5% 27% 43% 18% 3	591
August	1st to 10th	Night	5% 5% 23% 47% 19% 1	537
	11th to 20th	Night	6% 4 23% 39% 25% 3	534
	21st to end	Night	11% 4 26% 42% 16% 1	594
September	1st to 10th	Night	12% 5% 28% 35% 16% 4	540
	11th to 20th	Night	14% 6% 32% 34% 13% 1	540
	21st to end	Night	15% 8% 29% 36% 12% 1	540
October	1st to 10th	Night	19% 9% 28% 31% 12% 1	600
	11th to 20th	Night	16% 10% 31% 30% 12% 1	877
	21st to end	Night	17% 12% 35% 28% 7% 1	990
November	1st to 10th	Night	18% 13% 35% 25% 8% 1	925
	11th to 20th	Night	14% 11% 40% 27% 7% 1	950
	21st to end	Night	15% 14% 35% 30% 6%	950
December	1st to 10th	Night	12% 10% 36% 28% 10% 3	950
	11th to 20th	Night	15% 14% 33% 28% 10% 1	950
	21st to end	Night	14% 8% 35% 31% 10% 2	1045

Page generated at 2024-02-02 04:20:30. Version ac07

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