Flin Flon
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Flin Flon 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	13% 9% 4 8% 7% 4 5% 5% 6% 7% 30%	77330
	Night	11% 10% 5% 10% 8% 4 6% 6% 6% 6% 29%	81459
Transparency	Day	52% 7% 14% 19% 7%	77015
	Night	54% 7% 13% 18% 7%	81356
Seeing	Day	17% 12% 32% 26% 11% 3	14879
	Night	17% 9% 32% 29% 12% 2	24425

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% 13% 9% 17% 13% 6% 6% 6% 7% 4 13%	1899
	11th to 20th	Day	5% 12% 7% 17% 18% 6% 8% 6% 7% 4 11%	1882
	21st to end	Day	8% 16% 9% 14% 8% 4 6% 6% 6% 6% 17%	2725
February	1st to 10th	Day	6% 9% 5% 8% 10% 6% 9% 9% 7% 8% 24%	1472
	11th to 20th	Day	7% 11% 5% 8% 7% 4 8% 9% 7% 7% 26%	1414
	21st to end	Day	4 7% 6% 13% 10% 5% 6% 6% 6% 7% 28%	1470
March	1st to 10th	Day	10% 10% 5% 9% 8% 6% 5% 4 5% 6% 32%	1800
	11th to 20th	Day	10% 10% 5% 8% 8% 4 5% 4 5% 8% 34%	1854
	21st to end	Day	9% 10% 5% 9% 6% 3 5% 5% 7% 8% 33%	2341
April	1st to 10th	Day	9% 9% 3 8% 7% 5% 6% 4 5% 6% 38%	2164
	11th to 20th	Day	10% 11% 5% 7% 8% 4 5% 4 6% 7% 34%	2312
	21st to end	Day	10% 9% 4 8% 6% 5% 6% 5% 5% 8% 35%	2481
May	1st to 10th	Day	17% 11% 4 7% 7% 3 5% 6% 6% 6% 29%	2580
	11th to 20th	Day	12% 7% 3 5% 5% 3 5% 5% 5% 8% 42%	2655
	21st to end	Day	20% 7% 3 5% 5% 3 4 5% 5% 8% 37%	3004
June	1st to 10th	Day	17% 8% 3 6% 6% 4 5% 5% 6% 7% 32%	2880
	11th to 20th	Day	21% 6% 4 6% 8% 4 5% 4 6% 8% 28%	2880
	21st to end	Day	20% 6% 3 6% 6% 4 5% 5% 6% 7% 32%	2880
July	1st to 10th	Day	14% 5% 3 6% 6% 4 5% 6% 6% 7% 39%	2880
	11th to 20th	Day	14% 5% 3 6% 5% 4 5% 5% 6% 9% 38%	2880
	21st to end	Day	16% 5% 3 4 5% 4 6% 6% 6% 8% 37%	2973
August	1st to 10th	Day	11% 4 3 5% 5% 4 6% 5% 6% 7% 42%	2507
	11th to 20th	Day	14% 5% 2 5% 5% 4 6% 6% 7% 9% 37%	2477
	21st to end	Day	19% 6% 2 6% 5% 3 4 5% 5% 7% 36%	2610
September	1st to 10th	Day	14% 6% 3 7% 6% 4 5% 6% 5% 8% 35%	2181
	11th to 20th	Day	18% 10% 3 6% 6% 4 5% 5% 5% 5% 34%	2076
	21st to end	Day	14% 10% 4 6% 5% 3 3 5% 6% 7% 37%	1980
October	1st to 10th	Day	20% 13% 5% 6% 5% 4 5% 5% 5% 6% 27%	1828
	11th to 20th	Day	16% 19% 5% 9% 6% 3 5% 4 5% 6% 24%	1620
	21st to end	Day	19% 19% 7% 11% 6% 4 3 4 4 5% 18%	1782
November	1st to 10th	Day	16% 20% 7% 13% 8% 4 5% 3 4 4 16%	1414
	11th to 20th	Day	10% 16% 7% 13% 14% 5% 5% 4 4 5% 20%	1330
	21st to end	Day	10% 13% 7% 14% 12% 6% 6% 5% 5% 4 16%	1330
December	1st to 10th	Day	5% 11% 6% 14% 14% 5% 7% 8% 7% 5% 17%	1240
	11th to 20th	Day	11% 14% 7% 10% 9% 5% 4 6% 6% 6% 20%	1439
	21st to end	Day	5% 7% 3 9% 12% 5% 7% 8% 7% 5% 32%	2090
January	1st to 10th	Night	6% 11% 6% 15% 13% 7% 9% 8% 6% 5% 15%	5046
	11th to 20th	Night	5% 9% 5% 20% 17% 6% 7% 7% 7% 4 13%	5016
	21st to end	Night	9% 17% 7% 13% 8% 4 5% 7% 6% 5% 19%	4926
February	1st to 10th	Night	6% 10% 4 9% 8% 6% 10% 7% 8% 7% 25%	2583
	11th to 20th	Night	7% 10% 5% 10% 8% 4 6% 9% 6% 7% 30%	2447
	21st to end	Night	5% 7% 5% 10% 8% 4 7% 6% 7% 7% 33%	1785
March	1st to 10th	Night	10% 11% 4 8% 9% 4 5% 5% 5% 7% 32%	2160
	11th to 20th	Night	11% 10% 5% 7% 7% 4 5% 5% 5% 7% 33%	2104
	21st to end	Night	8% 9% 4 6% 6% 3 4 6% 5% 6% 41%	2012
April	1st to 10th	Night	9% 8% 3 7% 7% 4 5% 5% 6% 6% 39%	1796
	11th to 20th	Night	9% 9% 4 8% 6% 4 4 6% 5% 7% 38%	1599
	21st to end	Night	9% 9% 4 6% 5% 3 5% 5% 5% 8% 40%	1476
May	1st to 10th	Night	18% 7% 4 7% 6% 3 5% 5% 4 7% 35%	1379
	11th to 20th	Night	12% 7% 3 4 4 2 4 4 6% 7% 45%	1241
	21st to end	Night	19% 8% 2 4 4 2 4 4 4 6% 43%	1268
June	1st to 10th	Night	16% 6% 2 4 4 4 4 6% 5% 9% 40%	1080
	11th to 20th	Night	19% 7% 3 6% 5% 3 6% 5% 5% 8% 33%	1080
	21st to end	Night	16% 6% 2 4 5% 4 6% 5% 5% 8% 40%	1080
July	1st to 10th	Night	13% 4 2 5% 4 2 5% 4 7% 9% 45%	1080
	11th to 20th	Night	10% 4 1 5% 6% 4 6% 5% 7% 8% 43%	1080
	21st to end	Night	12% 4 2 5% 5% 4 5% 5% 7% 9% 42%	1341
August	1st to 10th	Night	11% 5% 2 5% 4 2 4 4 7% 7% 50%	1432
	11th to 20th	Night	13% 5% 2 5% 4 3 4 4 7% 9% 45%	1424
	21st to end	Night	17% 7% 3 4 4 3 4 5% 5% 8% 40%	1746
September	1st to 10th	Night	15% 5% 2 6% 4 3 5% 5% 5% 7% 43%	1777
	11th to 20th	Night	16% 7% 3 6% 5% 3 5% 5% 5% 7% 38%	1884
	21st to end	Night	16% 8% 2 5% 4 3 3 5% 5% 6% 42%	1980
October	1st to 10th	Night	19% 10% 3 5% 6% 3 5% 5% 5% 6% 33%	2110
	11th to 20th	Night	14% 13% 6% 9% 6% 3 4 4 5% 5% 31%	2340
	21st to end	Night	17% 19% 6% 10% 6% 3 4 5% 4 5% 21%	2574
November	1st to 10th	Night	15% 18% 8% 11% 9% 4 5% 4 4 4 18%	2659
	11th to 20th	Night	12% 14% 6% 13% 11% 6% 6% 4 4 6% 18%	2850
	21st to end	Night	10% 15% 7% 13% 12% 6% 6% 5% 4 5% 17%	2850
December	1st to 10th	Night	7% 12% 7% 13% 12% 6% 8% 9% 6% 5% 15%	2935
	11th to 20th	Night	8% 12% 7% 13% 10% 4 6% 6% 5% 5% 21%	3753
	21st to end	Night	6% 10% 4 7% 8% 4 6% 7% 6% 6% 34%	5566

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	71% 6% 11% 10% 2	1899
	11th to 20th	Day	73% 5% 7% 11% 3	1900
	21st to end	Day	66% 8% 12% 10% 4	2725
February	1st to 10th	Day	53% 6% 16% 17% 8% 1	1472
	11th to 20th	Day	53% 6% 13% 17% 10%	1422
	21st to end	Day	54% 5% 11% 21% 9%	1470
March	1st to 10th	Day	53% 4 13% 21% 8% 1	1800
	11th to 20th	Day	49% 6% 14% 21% 9% 1	1855
	21st to end	Day	47% 6% 14% 24% 8% 1	2341
April	1st to 10th	Day	45% 7% 11% 21% 15% 1	2164
	11th to 20th	Day	49% 6% 10% 22% 13% 1	2312
	21st to end	Day	45% 6% 13% 24% 11% 1	2481
May	1st to 10th	Day	52% 6% 11% 20% 10% 1	2580
	11th to 20th	Day	40% 5% 10% 25% 17% 3	2659
	21st to end	Day	45% 6% 11% 22% 15%	3004
June	1st to 10th	Day	50% 7% 11% 20% 11% 1	2880
	11th to 20th	Day	53% 8% 13% 18% 8%	2880
	21st to end	Day	49% 8% 15% 21% 6%	2880
July	1st to 10th	Day	40% 8% 16% 27% 8% 1	2801
	11th to 20th	Day	42% 8% 19% 25% 5%	2793
	21st to end	Day	43% 12% 18% 24% 4	2808
August	1st to 10th	Day	38% 11% 20% 26% 5%	2491
	11th to 20th	Day	41% 11% 24% 21% 3	2477
	21st to end	Day	47% 8% 24% 18% 3	2610
September	1st to 10th	Day	44% 10% 17% 21% 7%	2181
	11th to 20th	Day	50% 8% 20% 19% 2	2076
	21st to end	Day	46% 8% 19% 23% 4	1980
October	1st to 10th	Day	57% 8% 11% 20% 4	1828
	11th to 20th	Day	62% 8% 12% 15% 3	1620
	21st to end	Day	70% 8% 8% 11% 3	1782
November	1st to 10th	Day	74% 6% 10% 7% 4	1414
	11th to 20th	Day	69% 6% 11% 11% 2	1330
	21st to end	Day	71% 7% 12% 9% 2	1330
December	1st to 10th	Day	65% 7% 14% 9% 4	1240
	11th to 20th	Day	65% 6% 13% 12% 3	1440
	21st to end	Day	48% 8% 10% 19% 13% 1	2090
January	1st to 10th	Night	69% 7% 10% 12% 2	5046
	11th to 20th	Night	73% 5% 8% 12% 3	5060
	21st to end	Night	64% 8% 12% 12% 4	4926
February	1st to 10th	Night	54% 6% 12% 18% 9% 1	2583
	11th to 20th	Night	52% 5% 13% 21% 8%	2449
	21st to end	Night	48% 7% 15% 21% 8%	1785
March	1st to 10th	Night	53% 5% 11% 20% 9% 2	2160
	11th to 20th	Night	49% 6% 11% 21% 12% 1	2104
	21st to end	Night	41% 7% 14% 27% 10% 2	2012
April	1st to 10th	Night	44% 5% 12% 22% 16% 2	1796
	11th to 20th	Night	45% 7% 9% 22% 16% 1	1599
	21st to end	Night	41% 5% 12% 25% 16% 1	1476
May	1st to 10th	Night	49% 5% 9% 23% 12% 1	1379
	11th to 20th	Night	37% 6% 10% 26% 16% 5%	1241
	21st to end	Night	42% 7% 8% 24% 18% 1	1268
June	1st to 10th	Night	41% 8% 14% 22% 15% 1	1080
	11th to 20th	Night	47% 9% 15% 19% 9%	1080
	21st to end	Night	42% 7% 17% 25% 9%	1080
July	1st to 10th	Night	34% 7% 16% 29% 12% 1	1050
	11th to 20th	Night	34% 11% 19% 29% 7%	1044
	21st to end	Night	38% 11% 17% 29% 5%	1268
August	1st to 10th	Night	32% 9% 21% 32% 6%	1424
	11th to 20th	Night	35% 9% 23% 27% 6%	1424
	21st to end	Night	41% 9% 21% 24% 4	1746
September	1st to 10th	Night	41% 8% 17% 25% 9% 1	1777
	11th to 20th	Night	45% 8% 17% 26% 4	1884
	21st to end	Night	43% 7% 14% 27% 8%	1980
October	1st to 10th	Night	51% 8% 14% 22% 4	2110
	11th to 20th	Night	55% 8% 15% 18% 4	2340
	21st to end	Night	66% 8% 11% 13% 3	2574
November	1st to 10th	Night	70% 6% 9% 11% 3	2659
	11th to 20th	Night	70% 7% 12% 10% 2	2850
	21st to end	Night	70% 7% 10% 11% 2	2850
December	1st to 10th	Night	69% 8% 10% 10% 3	2935
	11th to 20th	Night	63% 6% 14% 12% 5%	3751
	21st to end	Night	47% 6% 14% 20% 12%	5566

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	11% 11% 46% 25% 7% 1	180
	11th to 20th	Day	11% 11% 46% 24% 7% 2	180
	21st to end	Day	21% 9% 31% 28% 10% 2	294
February	1st to 10th	Day	10% 14% 37% 25% 11% 2	252
	11th to 20th	Day	11% 13% 32% 28% 14% 2	240
	21st to end	Day	3 14% 37% 30% 11% 6%	198
March	1st to 10th	Day	12% 10% 35% 28% 12% 3	240
	11th to 20th	Day	12% 12% 38% 28% 9% 2	240
	21st to end	Day	11% 16% 36% 24% 11% 1	427
April	1st to 10th	Day	14% 12% 41% 26% 5% 2	424
	11th to 20th	Day	14% 14% 31% 30% 8% 2	590
	21st to end	Day	12% 17% 31% 29% 10% 2	600
May	1st to 10th	Day	18% 14% 29% 29% 9% 1	603
	11th to 20th	Day	15% 16% 34% 22% 11% 3	625
	21st to end	Day	21% 10% 31% 25% 11% 2	679
June	1st to 10th	Day	21% 12% 31% 22% 12% 2	630
	11th to 20th	Day	25% 15% 26% 24% 7% 3	630
	21st to end	Day	21% 8% 29% 25% 13% 4	630
July	1st to 10th	Day	16% 14% 25% 27% 13% 4	621
	11th to 20th	Day	17% 9% 26% 30% 13% 5%	618
	21st to end	Day	16% 7% 25% 26% 19% 6%	684
August	1st to 10th	Day	12% 10% 26% 30% 18% 5%	626
	11th to 20th	Day	12% 10% 32% 25% 16% 5%	615
	21st to end	Day	22% 9% 26% 30% 12% 1	693
September	1st to 10th	Day	19% 16% 38% 21% 6%	471
	11th to 20th	Day	22% 13% 32% 23% 7% 2	366
	21st to end	Day	20% 10% 34% 30% 6% 1	270
October	1st to 10th	Day	27% 13% 34% 20% 4 1	270
	11th to 20th	Day	27% 16% 33% 15% 9% 1	270
	21st to end	Day	28% 12% 31% 22% 6% 2	297
November	1st to 10th	Day	20% 9% 37% 22% 10% 1	270
	11th to 20th	Day	19% 13% 42% 21% 4 1	270
	21st to end	Day	16% 13% 43% 19% 7% 1	270
December	1st to 10th	Day	11% 10% 35% 30% 12% 3	228
	11th to 20th	Day	15% 12% 44% 23% 6%	180
	21st to end	Day	8% 7% 29% 39% 13% 4	198
January	1st to 10th	Night	14% 8% 39% 28% 9% 2	950
	11th to 20th	Night	15% 9% 40% 28% 8% 1	950
	21st to end	Night	19% 11% 34% 26% 9%	1045
February	1st to 10th	Night	10% 11% 38% 30% 10% 1	923
	11th to 20th	Night	12% 10% 30% 33% 12% 3	879
	21st to end	Night	6% 11% 36% 29% 17% 2	592
March	1st to 10th	Night	14% 9% 28% 34% 14% 2	720
	11th to 20th	Night	15% 11% 38% 25% 10% 2	664
	21st to end	Night	13% 8% 32% 29% 15% 3	594
April	1st to 10th	Night	13% 6% 28% 36% 15% 1	540
	11th to 20th	Night	14% 5% 36% 32% 14% 1	533
	21st to end	Night	12% 10% 36% 31% 9% 1	540
May	1st to 10th	Night	20% 8% 33% 28% 10% 1	540
	11th to 20th	Night	14% 13% 30% 30% 12% 2	531
	21st to end	Night	21% 8% 29% 29% 11% 2	494
June	1st to 10th	Night	18% 6% 26% 33% 14% 2	360
	11th to 20th	Night	22% 4 28% 33% 13% 1	360
	21st to end	Night	17% 4 26% 35% 16% 1	360
July	1st to 10th	Night	13% 6% 26% 33% 20% 1	350
	11th to 20th	Night	13% 4 23% 39% 18% 3	348
	21st to end	Night	13% 3 21% 35% 23% 5%	537
August	1st to 10th	Night	12% 6% 23% 33% 23% 3	537
	11th to 20th	Night	14% 6% 24% 31% 21% 4	534
	21st to end	Night	19% 6% 26% 37% 12% 1	594
September	1st to 10th	Night	19% 8% 26% 31% 15%	540
	11th to 20th	Night	20% 9% 26% 34% 11%	540
	21st to end	Night	18% 9% 30% 33% 10% 1	540
October	1st to 10th	Night	24% 6% 31% 28% 10% 1	670
	11th to 20th	Night	22% 12% 28% 27% 9% 2	900
	21st to end	Night	28% 12% 28% 23% 8% 1	990
November	1st to 10th	Night	24% 11% 31% 24% 8% 1	925
	11th to 20th	Night	19% 10% 38% 24% 8% 1	950
	21st to end	Night	17% 13% 36% 26% 7% 1	950
December	1st to 10th	Night	11% 10% 34% 31% 9% 3	950
	11th to 20th	Night	16% 11% 35% 24% 11% 2	950
	21st to end	Night	15% 8% 29% 31% 14% 2	1045

Page generated at 2024-02-02 04:20:26. Version ac07

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