Maniwaki
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Maniwaki clear sky chart from 2005-11-06 to 2024-01-16.

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% 11% 4 8% 6% 3 5% 4 5% 6% 30%	74753
	Night	18% 12% 4 8% 6% 3 4 4 5% 6% 30%	75046
Transparency	Day	54% 6% 11% 19% 9% 1	74458
	Night	55% 6% 11% 18% 9% 1	74875
Seeing	Day	24% 15% 29% 20% 9% 3	13280
	Night	24% 11% 26% 27% 10% 1	22482

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	18% 19% 8% 14% 9% 3 5% 2 3 4 17%	1517
	11th to 20th	Day	19% 16% 6% 10% 6% 3 5% 4 4 5% 21%	1480
	21st to end	Day	14% 14% 6% 10% 7% 4 6% 4 4 7% 24%	1624
February	1st to 10th	Day	12% 17% 7% 11% 11% 4 5% 4 5% 5% 19%	1620
	11th to 20th	Day	13% 20% 5% 12% 6% 3 3 4 4 4 26%	1573
	21st to end	Day	19% 16% 5% 9% 7% 3 4 3 3 5% 26%	1462
March	1st to 10th	Day	16% 12% 6% 9% 9% 3 5% 5% 4 6% 26%	1797
	11th to 20th	Day	14% 15% 5% 8% 7% 4 5% 4 4 6% 27%	1980
	21st to end	Day	19% 9% 4 6% 6% 3 5% 4 4 6% 35%	2290
April	1st to 10th	Day	23% 14% 4 7% 6% 3 3 3 3 5% 29%	2160
	11th to 20th	Day	23% 9% 4 6% 6% 2 4 4 4 5% 34%	2134
	21st to end	Day	22% 11% 4 7% 5% 3 4 4 4 5% 31%	2340
May	1st to 10th	Day	19% 11% 3 6% 6% 3 4 3 4 6% 33%	2520
	11th to 20th	Day	20% 7% 4 7% 6% 3 4 4 5% 6% 35%	2478
	21st to end	Day	17% 7% 3 6% 5% 3 5% 5% 5% 6% 36%	2725
June	1st to 10th	Day	21% 8% 4 7% 7% 3 6% 5% 5% 6% 28%	2520
	11th to 20th	Day	16% 6% 3 5% 5% 4 5% 4 6% 8% 38%	2520
	21st to end	Day	19% 7% 3 6% 6% 4 6% 7% 6% 7% 30%	2520
July	1st to 10th	Day	14% 5% 3 6% 6% 4 6% 6% 7% 9% 36%	2520
	11th to 20th	Day	13% 7% 4 5% 7% 4 5% 5% 6% 8% 35%	2520
	21st to end	Day	12% 6% 4 7% 7% 3 6% 6% 6% 8% 35%	2744
August	1st to 10th	Day	13% 7% 3 8% 7% 5% 6% 6% 6% 8% 32%	2498
	11th to 20th	Day	13% 7% 3 6% 7% 3 5% 5% 6% 7% 37%	2303
	21st to end	Day	15% 7% 3 7% 7% 4 5% 6% 6% 7% 35%	2376
September	1st to 10th	Day	16% 6% 3 5% 5% 3 5% 4 6% 6% 41%	2160
	11th to 20th	Day	15% 7% 3 7% 5% 3 3 4 6% 6% 41%	2160
	21st to end	Day	20% 7% 2 6% 5% 3 5% 4 5% 7% 35%	1918
October	1st to 10th	Day	20% 8% 3 6% 6% 3 5% 5% 5% 7% 32%	1800
	11th to 20th	Day	27% 10% 4 9% 5% 3 4 5% 4 6% 23%	1800
	21st to end	Day	27% 12% 4 6% 6% 3 5% 4 4 5% 24%	1823
November	1st to 10th	Day	17% 12% 4 7% 6% 3 4 4 5% 7% 31%	1633
	11th to 20th	Day	21% 15% 6% 9% 8% 3 5% 4 5% 5% 21%	1520
	21st to end	Day	24% 18% 6% 11% 6% 3 3 4 3 4 18%	1520
December	1st to 10th	Day	24% 18% 6% 11% 7% 3 4 3 4 5% 15%	1520
	11th to 20th	Day	21% 15% 7% 11% 7% 3 5% 5% 5% 5% 17%	1906
	21st to end	Day	26% 19% 7% 11% 5% 2 3 3 3 4 17%	2772
January	1st to 10th	Night	19% 18% 7% 12% 7% 3 5% 4 4 4 16%	2649
	11th to 20th	Night	21% 15% 7% 10% 6% 3 5% 4 4 5% 20%	2602
	21st to end	Night	12% 14% 6% 10% 7% 4 6% 5% 4 5% 28%	2727
February	1st to 10th	Night	13% 15% 7% 12% 9% 4 5% 4 4 5% 22%	2340
	11th to 20th	Night	14% 14% 7% 11% 8% 3 6% 4 4 4 25%	2273
	21st to end	Night	15% 14% 6% 9% 8% 3 5% 4 5% 5% 26%	1794
March	1st to 10th	Night	17% 13% 5% 9% 8% 3 6% 4 5% 4 25%	2148
	11th to 20th	Night	17% 14% 5% 7% 7% 4 4 3 4 5% 30%	1979
	21st to end	Night	15% 11% 4 6% 6% 2 4 4 4 4 39%	2065
April	1st to 10th	Night	23% 11% 4 6% 5% 3 3 5% 5% 6% 30%	1800
	11th to 20th	Night	19% 9% 3 5% 5% 3 4 4 5% 5% 38%	1775
	21st to end	Night	23% 10% 4 7% 5% 3 3 4 4 5% 32%	1635
May	1st to 10th	Night	19% 9% 4 5% 5% 3 4 3 5% 6% 35%	1440
	11th to 20th	Night	18% 8% 3 6% 5% 3 4 4 4 6% 38%	1415
	21st to end	Night	16% 6% 3 6% 6% 2 4 5% 5% 8% 39%	1550
June	1st to 10th	Night	17% 8% 3 5% 6% 2 5% 6% 6% 9% 33%	1440
	11th to 20th	Night	13% 8% 3 6% 5% 3 5% 5% 5% 8% 39%	1440
	21st to end	Night	16% 8% 2 6% 7% 3 5% 5% 6% 8% 35%	1440
July	1st to 10th	Night	12% 5% 2 5% 5% 3 6% 6% 6% 9% 40%	1440
	11th to 20th	Night	12% 6% 3 5% 5% 3 5% 6% 6% 8% 42%	1440
	21st to end	Night	10% 5% 3 4 5% 3 5% 5% 8% 10% 41%	1574
August	1st to 10th	Night	10% 5% 3 5% 5% 4 5% 6% 8% 8% 40%	1437
	11th to 20th	Night	11% 6% 3 5% 5% 3 4 5% 6% 9% 43%	1598
	21st to end	Night	16% 5% 2 4 5% 3 4 5% 7% 8% 41%	1961
September	1st to 10th	Night	13% 6% 3 6% 5% 3 4 5% 5% 7% 42%	1800
	11th to 20th	Night	17% 5% 3 5% 4 2 4 5% 5% 6% 45%	1800
	21st to end	Night	20% 7% 3 5% 5% 3 3 4 4 6% 39%	2039
October	1st to 10th	Night	21% 8% 3 6% 5% 3 3 3 4 6% 37%	2160
	11th to 20th	Night	24% 11% 4 8% 6% 3 5% 3 4 6% 26%	2160
	21st to end	Night	26% 10% 3 7% 5% 4 5% 5% 6% 5% 24%	2532
November	1st to 10th	Night	19% 13% 4 7% 6% 4 5% 4 4 6% 29%	2441
	11th to 20th	Night	20% 12% 5% 10% 8% 4 5% 4 4 5% 24%	2660
	21st to end	Night	24% 16% 6% 9% 6% 4 4 4 4 5% 18%	2660
December	1st to 10th	Night	22% 19% 6% 11% 6% 3 5% 4 4 4 15%	2660
	11th to 20th	Night	23% 15% 6% 9% 7% 2 4 3 4 4 22%	3288
	21st to end	Night	25% 20% 5% 11% 6% 2 3 3 3 3 17%	4884

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% 4 7% 13% 4	1518
	11th to 20th	Day	66% 4 9% 10% 10%	1480
	21st to end	Day	62% 3 9% 15% 10% 1	1624
February	1st to 10th	Day	68% 4 8% 14% 6% 1	1620
	11th to 20th	Day	62% 3 11% 14% 10% 1	1582
	21st to end	Day	63% 4 8% 15% 10%	1462
March	1st to 10th	Day	59% 4 9% 17% 11% 1	1800
	11th to 20th	Day	59% 4 9% 15% 10% 3	1980
	21st to end	Day	50% 4 9% 20% 13% 3	2290
April	1st to 10th	Day	59% 3 7% 17% 11% 3	2160
	11th to 20th	Day	53% 3 7% 22% 12% 2	2134
	21st to end	Day	56% 4 9% 16% 12% 3	2340
May	1st to 10th	Day	53% 5% 7% 20% 13% 3	2520
	11th to 20th	Day	51% 5% 8% 18% 17% 2	2482
	21st to end	Day	47% 6% 12% 18% 14% 3	2725
June	1st to 10th	Day	55% 7% 9% 18% 10% 1	2520
	11th to 20th	Day	43% 7% 11% 25% 12% 2	2520
	21st to end	Day	52% 8% 12% 19% 9% 1	2520
July	1st to 10th	Day	41% 8% 14% 26% 10%	2450
	11th to 20th	Day	43% 7% 14% 25% 10%	2445
	21st to end	Day	46% 8% 13% 24% 8%	2591
August	1st to 10th	Day	47% 8% 15% 23% 7%	2484
	11th to 20th	Day	44% 9% 15% 24% 8% 1	2303
	21st to end	Day	45% 7% 14% 22% 11% 1	2376
September	1st to 10th	Day	41% 7% 14% 25% 12%	2160
	11th to 20th	Day	43% 6% 13% 27% 10% 1	2160
	21st to end	Day	47% 7% 14% 24% 8%	1918
October	1st to 10th	Day	51% 6% 12% 21% 10%	1800
	11th to 20th	Day	62% 7% 12% 15% 4 1	1800
	21st to end	Day	62% 6% 12% 14% 6% 1	1823
November	1st to 10th	Day	51% 6% 14% 22% 6% 1	1633
	11th to 20th	Day	65% 6% 12% 12% 6%	1520
	21st to end	Day	71% 5% 11% 8% 5%	1520
December	1st to 10th	Day	73% 5% 10% 9% 3	1520
	11th to 20th	Day	67% 7% 8% 12% 6%	1906
	21st to end	Day	73% 3 7% 14% 3	2772
January	1st to 10th	Night	72% 4 10% 10% 4	2649
	11th to 20th	Night	68% 4 9% 11% 7% 1	2602
	21st to end	Night	59% 5% 8% 16% 11% 1	2727
February	1st to 10th	Night	65% 5% 9% 15% 6% 1	2340
	11th to 20th	Night	63% 4 10% 17% 6% 1	2275
	21st to end	Night	59% 5% 9% 18% 8% 1	1794
March	1st to 10th	Night	61% 5% 8% 17% 9% 1	2158
	11th to 20th	Night	57% 4 8% 17% 11% 2	1980
	21st to end	Night	50% 5% 8% 20% 14% 4	2065
April	1st to 10th	Night	54% 5% 9% 17% 14% 2	1800
	11th to 20th	Night	47% 4 9% 23% 14% 2	1775
	21st to end	Night	54% 4 8% 17% 15% 3	1635
May	1st to 10th	Night	49% 4 8% 19% 16% 4	1440
	11th to 20th	Night	47% 5% 9% 20% 15% 4	1416
	21st to end	Night	44% 6% 12% 21% 15% 2	1551
June	1st to 10th	Night	46% 8% 14% 22% 10% 1	1440
	11th to 20th	Night	43% 7% 11% 24% 13% 2	1440
	21st to end	Night	46% 8% 13% 20% 12%	1440
July	1st to 10th	Night	36% 8% 16% 25% 14% 1	1400
	11th to 20th	Night	39% 7% 12% 29% 12% 1	1392
	21st to end	Night	36% 9% 19% 26% 10%	1486
August	1st to 10th	Night	38% 11% 18% 24% 10%	1427
	11th to 20th	Night	37% 8% 19% 26% 10%	1598
	21st to end	Night	39% 8% 17% 27% 9% 1	1961
September	1st to 10th	Night	40% 7% 14% 27% 12%	1800
	11th to 20th	Night	38% 7% 15% 32% 8% 1	1800
	21st to end	Night	46% 6% 13% 27% 8%	2039
October	1st to 10th	Night	48% 6% 11% 24% 11% 1	2160
	11th to 20th	Night	59% 6% 11% 17% 6% 1	2160
	21st to end	Night	60% 6% 11% 17% 6%	2532
November	1st to 10th	Night	56% 6% 13% 17% 7%	2441
	11th to 20th	Night	61% 5% 12% 14% 7% 1	2660
	21st to end	Night	68% 6% 11% 13% 3	2660
December	1st to 10th	Night	72% 5% 9% 10% 3	2660
	11th to 20th	Night	66% 5% 8% 15% 7%	3288
	21st to end	Night	74% 4 6% 13% 4	4884

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	22% 17% 37% 19% 4 1	180
	11th to 20th	Day	29% 8% 38% 17% 8% 1	170
	21st to end	Day	21% 15% 36% 19% 8% 2	194
February	1st to 10th	Day	27% 23% 36% 10% 3	240
	11th to 20th	Day	29% 24% 37% 9% 2	240
	21st to end	Day	30% 19% 31% 17% 2	328
March	1st to 10th	Day	23% 16% 36% 20% 5%	420
	11th to 20th	Day	27% 17% 32% 16% 6% 1	420
	21st to end	Day	31% 16% 28% 16% 7% 1	462
April	1st to 10th	Day	31% 16% 26% 17% 8% 2	420
	11th to 20th	Day	34% 17% 20% 16% 11% 3	412
	21st to end	Day	30% 17% 30% 14% 7% 1	420
May	1st to 10th	Day	28% 15% 31% 18% 6% 2	423
	11th to 20th	Day	24% 17% 30% 18% 10% 2	447
	21st to end	Day	21% 18% 33% 17% 9% 2	485
June	1st to 10th	Day	24% 14% 33% 22% 6% 2	450
	11th to 20th	Day	20% 15% 31% 18% 13% 3	450
	21st to end	Day	21% 13% 27% 24% 13% 2	450
July	1st to 10th	Day	13% 9% 31% 33% 10% 4	445
	11th to 20th	Day	16% 11% 28% 29% 14% 2	444
	21st to end	Day	14% 11% 28% 30% 15% 2	488
August	1st to 10th	Day	18% 9% 26% 26% 18% 3	446
	11th to 20th	Day	18% 6% 26% 26% 16% 9%	439
	21st to end	Day	19% 13% 27% 19% 15% 8%	495
September	1st to 10th	Day	18% 13% 24% 24% 14% 7%	450
	11th to 20th	Day	18% 12% 24% 21% 16% 8%	450
	21st to end	Day	21% 13% 24% 22% 12% 8%	450
October	1st to 10th	Day	25% 14% 22% 22% 12% 4	450
	11th to 20th	Day	31% 16% 28% 16% 6% 2	450
	21st to end	Day	34% 15% 26% 19% 6% 1	417
November	1st to 10th	Day	29% 14% 28% 22% 6% 1	327
	11th to 20th	Day	32% 16% 33% 12% 6% 2	180
	21st to end	Day	33% 23% 26% 14% 3 1	180
December	1st to 10th	Day	32% 16% 30% 19% 2 1	180
	11th to 20th	Day	31% 21% 32% 12% 3 1	180
	21st to end	Day	35% 13% 30% 14% 7% 2	198
January	1st to 10th	Night	28% 12% 31% 22% 6%	760
	11th to 20th	Night	31% 13% 25% 25% 7%	744
	21st to end	Night	18% 10% 32% 30% 9%	792
February	1st to 10th	Night	20% 15% 35% 23% 6% 1	720
	11th to 20th	Night	22% 14% 36% 22% 6% 1	703
	21st to end	Night	23% 18% 28% 26% 5%	592
March	1st to 10th	Night	25% 16% 28% 26% 5%	720
	11th to 20th	Night	25% 15% 28% 24% 7% 1	720
	21st to end	Night	22% 14% 29% 26% 8%	792
April	1st to 10th	Night	28% 14% 24% 28% 6%	720
	11th to 20th	Night	25% 13% 27% 24% 10%	711
	21st to end	Night	29% 12% 25% 24% 9%	555
May	1st to 10th	Night	24% 8% 31% 26% 11%	360
	11th to 20th	Night	21% 8% 28% 32% 9% 1	354
	21st to end	Night	17% 8% 34% 32% 9%	389
June	1st to 10th	Night	18% 9% 32% 33% 7% 1	360
	11th to 20th	Night	19% 8% 23% 35% 14% 1	360
	21st to end	Night	20% 6% 21% 38% 14% 1	360
July	1st to 10th	Night	13% 5% 25% 41% 15% 1	350
	11th to 20th	Night	13% 5% 19% 43% 20%	348
	21st to end	Night	11% 5% 23% 40% 19% 2	394
August	1st to 10th	Night	11% 7% 19% 42% 21% 1	363
	11th to 20th	Night	13% 3 16% 37% 28% 3	534
	21st to end	Night	18% 6% 22% 32% 20% 3	773
September	1st to 10th	Night	17% 6% 25% 30% 19% 2	720
	11th to 20th	Night	20% 7% 22% 30% 20% 2	720
	21st to end	Night	22% 8% 22% 26% 19% 2	720
October	1st to 10th	Night	25% 10% 28% 22% 14% 2	720
	11th to 20th	Night	31% 12% 26% 21% 9% 2	720
	21st to end	Night	32% 10% 26% 24% 7% 1	792
November	1st to 10th	Night	31% 12% 24% 24% 7% 1	740
	11th to 20th	Night	26% 16% 28% 20% 10% 1	760
	21st to end	Night	34% 15% 23% 22% 6% 1	760
December	1st to 10th	Night	33% 14% 28% 19% 6%	760
	11th to 20th	Night	29% 13% 27% 24% 6% 1	760
	21st to end	Night	35% 13% 24% 22% 5% 1	836

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