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 2024-12-06.

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% 11% 4 9% 5% 4 5% 4 5% 6% 30%	101853
	Night	17% 13% 4 9% 5% 4 4 3 5% 6% 29%	97857
Transparency	Day	53% 6% 12% 20% 9% 1	105336
	Night	55% 6% 12% 18% 8% 1	102463
Seeing	Day	24% 15% 29% 20% 9% 3	14458
	Night	24% 11% 26% 27% 10% 1	23557

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	16% 20% 6% 17% 8% 4 3 2 3 3 17%	2517
	11th to 20th	Day	14% 14% 6% 19% 8% 4 4 2 3 4 22%	2520
	21st to end	Day	13% 20% 7% 14% 6% 6% 4 3 4 5% 18%	2840
February	1st to 10th	Day	12% 18% 7% 14% 8% 5% 4 3 4 5% 20%	1710
	11th to 20th	Day	12% 20% 5% 13% 6% 4 4 3 4 4 25%	1663
	21st to end	Day	19% 16% 4 10% 7% 4 4 3 4 5% 25%	1551
March	1st to 10th	Day	18% 16% 4 9% 6% 4 4 3 4 6% 26%	3116
	11th to 20th	Day	12% 20% 7% 11% 5% 5% 4 3 3 4 25%	3480
	21st to end	Day	13% 8% 3 8% 6% 4 5% 4 5% 7% 38%	4024
April	1st to 10th	Day	22% 16% 3 7% 5% 3 3 3 3 5% 30%	2280
	11th to 20th	Day	23% 10% 4 7% 5% 3 3 3 4 5% 33%	2254
	21st to end	Day	22% 11% 4 8% 5% 4 4 3 4 5% 31%	2471
May	1st to 10th	Day	20% 11% 3 8% 5% 5% 5% 3 5% 6% 29%	4426
	11th to 20th	Day	18% 8% 3 7% 5% 4 5% 4 5% 8% 34%	4398
	21st to end	Day	17% 8% 3 7% 5% 5% 5% 4 6% 6% 35%	4837
June	1st to 10th	Day	21% 9% 4 7% 6% 5% 5% 4 5% 5% 28%	2660
	11th to 20th	Day	15% 7% 2 6% 4 5% 5% 4 7% 8% 37%	2660
	21st to end	Day	19% 8% 2 7% 5% 5% 5% 6% 6% 6% 29%	2660
July	1st to 10th	Day	13% 7% 3 8% 6% 5% 6% 5% 8% 9% 30%	4440
	11th to 20th	Day	13% 8% 3 7% 6% 5% 5% 5% 6% 8% 35%	4440
	21st to end	Day	12% 6% 3 6% 5% 4 5% 4 5% 8% 43%	4814
August	1st to 10th	Day	13% 7% 3 9% 6% 6% 6% 5% 7% 8% 30%	4401
	11th to 20th	Day	16% 7% 3 7% 5% 5% 5% 4 6% 7% 35%	4044
	21st to end	Day	12% 6% 2 8% 5% 5% 5% 5% 6% 9% 37%	4180
September	1st to 10th	Day	16% 7% 2 6% 4 4 5% 3 6% 6% 41%	2280
	11th to 20th	Day	14% 8% 3 8% 4 3 4 3 6% 6% 42%	2280
	21st to end	Day	20% 7% 2 7% 4 4 4 4 5% 7% 35%	2024
October	1st to 10th	Day	19% 10% 3 8% 5% 4 5% 4 5% 7% 32%	1900
	11th to 20th	Day	25% 11% 3 9% 4 4 4 4 4 6% 25%	1900
	21st to end	Day	26% 12% 4 8% 5% 4 5% 3 4 5% 24%	1924
November	1st to 10th	Day	17% 13% 4 8% 5% 3 5% 3 5% 7% 30%	1721
	11th to 20th	Day	19% 16% 5% 10% 6% 4 5% 4 5% 5% 21%	1600
	21st to end	Day	24% 20% 6% 13% 5% 4 3 3 3 4 17%	1600
December	1st to 10th	Day	23% 21% 5% 12% 6% 4 3 3 4 4 15%	1560
	11th to 20th	Day	21% 17% 7% 12% 5% 4 4 4 5% 4 17%	1906
	21st to end	Day	26% 19% 7% 13% 3 2 3 2 3 4 17%	2772
January	1st to 10th	Night	17% 20% 6% 14% 6% 4 3 3 4 4 20%	4429
	11th to 20th	Night	14% 15% 6% 15% 7% 5% 5% 3 5% 5% 21%	4440
	21st to end	Night	12% 18% 8% 13% 7% 7% 5% 3 3 4 19%	4811
February	1st to 10th	Night	12% 17% 6% 14% 7% 6% 4 4 4 5% 22%	2470
	11th to 20th	Night	13% 15% 6% 12% 7% 6% 4 3 4 4 24%	2403
	21st to end	Night	15% 15% 5% 11% 6% 4 5% 4 5% 5% 25%	1903
March	1st to 10th	Night	20% 14% 4 8% 6% 5% 4 2 4 5% 28%	3708
	11th to 20th	Night	16% 20% 5% 11% 5% 4 4 3 3 5% 24%	3479
	21st to end	Night	13% 9% 4 10% 5% 4 4 4 5% 6% 38%	3607
April	1st to 10th	Night	22% 12% 3 7% 4 4 3 4 5% 5% 30%	1900
	11th to 20th	Night	19% 10% 3 6% 4 4 3 3 5% 6% 37%	1875
	21st to end	Night	23% 10% 3 7% 4 4 3 3 4 4 33%	1725
May	1st to 10th	Night	21% 11% 4 8% 5% 4 5% 3 5% 6% 29%	2514
	11th to 20th	Night	17% 9% 3 7% 6% 4 5% 4 5% 6% 34%	2495
	21st to end	Night	16% 8% 3 8% 5% 4 4 4 6% 7% 35%	2738
June	1st to 10th	Night	17% 9% 2 7% 5% 4 5% 5% 6% 9% 32%	1520
	11th to 20th	Night	13% 9% 3 6% 5% 4 4 4 5% 7% 39%	1520
	21st to end	Night	17% 8% 2 7% 6% 4 4 4 5% 8% 35%	1520
July	1st to 10th	Night	13% 8% 3 8% 6% 6% 6% 5% 6% 8% 33%	2520
	11th to 20th	Night	14% 8% 3 7% 5% 4 4 4 6% 8% 38%	2520
	21st to end	Night	10% 6% 2 5% 4 4 4 3 7% 8% 46%	2739
August	1st to 10th	Night	11% 7% 3 8% 5% 5% 5% 4 7% 8% 37%	2525
	11th to 20th	Night	17% 7% 2 6% 4 4 4 4 6% 8% 37%	2785
	21st to end	Night	18% 6% 3 6% 4 4 4 4 7% 7% 37%	3443
September	1st to 10th	Night	13% 7% 3 7% 4 3 4 3 5% 7% 43%	1900
	11th to 20th	Night	16% 5% 2 5% 3 3 4 4 5% 6% 46%	1900
	21st to end	Night	19% 8% 3 6% 4 4 4 3 4 6% 39%	2153
October	1st to 10th	Night	21% 9% 2 7% 4 4 3 3 4 6% 37%	2280
	11th to 20th	Night	23% 12% 3 9% 5% 4 4 3 4 6% 27%	2280
	21st to end	Night	25% 11% 3 8% 4 5% 5% 4 6% 5% 25%	2673
November	1st to 10th	Night	19% 14% 3 8% 5% 5% 4 3 5% 5% 28%	2573
	11th to 20th	Night	19% 13% 4 11% 6% 5% 4 3 5% 5% 24%	2800
	21st to end	Night	23% 18% 6% 10% 5% 5% 4 3 5% 5% 18%	2800
December	1st to 10th	Night	21% 21% 6% 12% 6% 4 4 4 4 3 15%	2737
	11th to 20th	Night	23% 17% 5% 11% 5% 3 4 3 4 4 22%	3288
	21st to end	Night	25% 21% 5% 13% 5% 3 3 2 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	72% 5% 8% 11% 4	2518
	11th to 20th	Day	68% 4 8% 14% 6%	2520
	21st to end	Day	68% 5% 10% 11% 6% 1	2840
February	1st to 10th	Day	67% 4 9% 14% 6% 1	1710
	11th to 20th	Day	62% 4 11% 13% 9% 1	1672
	21st to end	Day	62% 5% 8% 14% 10% 1	1551
March	1st to 10th	Day	58% 6% 9% 16% 10% 1	3119
	11th to 20th	Day	61% 5% 9% 14% 8% 2	3480
	21st to end	Day	44% 6% 10% 22% 16% 2	4024
April	1st to 10th	Day	58% 3 7% 18% 11% 2	2280
	11th to 20th	Day	54% 3 7% 22% 11% 2	2254
	21st to end	Day	56% 4 8% 17% 12% 3	2471
May	1st to 10th	Day	52% 8% 9% 20% 9% 2	4440
	11th to 20th	Day	46% 8% 13% 21% 10% 1	4402
	21st to end	Day	47% 7% 12% 18% 15% 2	4837
June	1st to 10th	Day	55% 7% 9% 18% 10% 1	2660
	11th to 20th	Day	43% 7% 11% 25% 12% 2	2660
	21st to end	Day	52% 7% 12% 18% 9% 1	2660
July	1st to 10th	Day	46% 8% 14% 25% 7%	4370
	11th to 20th	Day	44% 7% 16% 26% 7%	4365
	21st to end	Day	39% 7% 15% 30% 9%	4661
August	1st to 10th	Day	48% 8% 15% 23% 6%	4387
	11th to 20th	Day	46% 7% 15% 26% 6%	4083
	21st to end	Day	42% 7% 15% 23% 12% 1	4180
September	1st to 10th	Day	40% 7% 14% 26% 12%	2280
	11th to 20th	Day	41% 6% 14% 28% 10% 1	2280
	21st to end	Day	47% 7% 14% 23% 9%	2024
October	1st to 10th	Day	52% 6% 10% 26% 6%	3160
	11th to 20th	Day	55% 6% 13% 21% 5%	3140
	21st to end	Day	57% 7% 17% 14% 5%	3149
November	1st to 10th	Day	52% 6% 14% 22% 6% 1	1721
	11th to 20th	Day	64% 6% 12% 12% 6%	1600
	21st to end	Day	72% 5% 10% 8% 5%	1600
December	1st to 10th	Day	73% 5% 10% 9% 3	1560
	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	67% 6% 15% 10% 2	4429
	11th to 20th	Night	64% 5% 14% 12% 4	4440
	21st to end	Night	69% 6% 9% 9% 6%	4811
February	1st to 10th	Night	64% 5% 10% 15% 6% 1	2470
	11th to 20th	Night	62% 4 9% 17% 6% 1	2405
	21st to end	Night	59% 5% 9% 18% 8% 1	1903
March	1st to 10th	Night	58% 6% 11% 15% 8% 2	3718
	11th to 20th	Night	62% 5% 9% 15% 7% 1	3480
	21st to end	Night	45% 5% 10% 22% 15% 3	3607
April	1st to 10th	Night	54% 5% 9% 17% 14% 2	1900
	11th to 20th	Night	48% 4 9% 23% 14% 2	1875
	21st to end	Night	54% 4 8% 17% 15% 2	1725
May	1st to 10th	Night	53% 7% 10% 18% 9% 2	2520
	11th to 20th	Night	46% 10% 13% 19% 9% 2	2496
	21st to end	Night	47% 7% 10% 21% 13% 2	2739
June	1st to 10th	Night	47% 8% 14% 22% 10% 1	1520
	11th to 20th	Night	43% 7% 11% 25% 12% 2	1520
	21st to end	Night	47% 8% 13% 20% 12%	1520
July	1st to 10th	Night	47% 7% 16% 19% 10%	2480
	11th to 20th	Night	43% 7% 16% 27% 7%	2472
	21st to end	Night	35% 7% 16% 32% 11%	2651
August	1st to 10th	Night	40% 9% 16% 26% 9%	2515
	11th to 20th	Night	43% 7% 17% 26% 7%	2812
	21st to end	Night	44% 7% 15% 22% 10% 2	3443
September	1st to 10th	Night	39% 7% 14% 28% 12%	1900
	11th to 20th	Night	36% 7% 15% 33% 9%	1900
	21st to end	Night	46% 6% 14% 26% 8%	2153
October	1st to 10th	Night	45% 6% 14% 26% 10%	3800
	11th to 20th	Night	51% 6% 14% 21% 7%	3779
	21st to end	Night	56% 5% 16% 14% 9%	4398
November	1st to 10th	Night	57% 6% 13% 17% 7%	2573
	11th to 20th	Night	61% 5% 11% 14% 8% 1	2800
	21st to end	Night	69% 6% 11% 13% 2	2800
December	1st to 10th	Night	72% 5% 9% 10% 3	2737
	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	180
	21st to end	Day	20% 15% 37% 20% 7% 1	218
February	1st to 10th	Day	26% 23% 36% 11% 5%	270
	11th to 20th	Day	26% 26% 36% 11% 1	270
	21st to end	Day	30% 19% 32% 17% 2	363
March	1st to 10th	Day	23% 17% 35% 19% 5%	460
	11th to 20th	Day	27% 17% 33% 16% 6% 1	460
	21st to end	Day	30% 17% 30% 16% 6% 1	506
April	1st to 10th	Day	32% 15% 26% 17% 8% 2	460
	11th to 20th	Day	35% 18% 20% 15% 10% 3	452
	21st to end	Day	31% 18% 29% 14% 7% 1	460
May	1st to 10th	Day	27% 15% 32% 19% 5% 3	463
	11th to 20th	Day	23% 17% 29% 19% 10% 2	487
	21st to end	Day	22% 18% 33% 18% 8% 2	529
June	1st to 10th	Day	24% 13% 32% 21% 7% 2	490
	11th to 20th	Day	20% 15% 32% 18% 13% 3	490
	21st to end	Day	22% 14% 28% 22% 12% 2	490
July	1st to 10th	Day	14% 8% 31% 33% 10% 3	485
	11th to 20th	Day	16% 10% 29% 29% 13% 2	484
	21st to end	Day	14% 11% 27% 31% 15% 3	532
August	1st to 10th	Day	18% 9% 26% 26% 18% 3	486
	11th to 20th	Day	18% 6% 25% 25% 16% 9%	479
	21st to end	Day	18% 13% 27% 20% 15% 7%	539
September	1st to 10th	Day	19% 13% 24% 24% 13% 7%	490
	11th to 20th	Day	17% 11% 22% 22% 18% 11%	490
	21st to end	Day	21% 12% 23% 22% 14% 8%	490
October	1st to 10th	Day	26% 14% 22% 22% 12% 4	490
	11th to 20th	Day	30% 17% 28% 17% 7% 2	490
	21st to end	Day	33% 15% 27% 19% 6% 1	452
November	1st to 10th	Day	31% 14% 28% 21% 5% 1	355
	11th to 20th	Day	30% 17% 32% 14% 6% 2	200
	21st to end	Day	34% 23% 26% 14% 3 1	200
December	1st to 10th	Day	31% 16% 29% 21% 2 1	190
	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	30% 13% 25% 25% 6%	760
	21st to end	Night	18% 11% 32% 30% 9%	836
February	1st to 10th	Night	20% 15% 34% 25% 6% 1	760
	11th to 20th	Night	22% 14% 36% 22% 5% 1	743
	21st to end	Night	23% 18% 28% 26% 5%	628
March	1st to 10th	Night	25% 16% 28% 26% 5%	760
	11th to 20th	Night	25% 15% 28% 25% 7% 1	760
	21st to end	Night	22% 15% 29% 26% 8%	836
April	1st to 10th	Night	27% 14% 25% 28% 6%	760
	11th to 20th	Night	26% 13% 28% 24% 10%	751
	21st to end	Night	29% 12% 25% 24% 9%	585
May	1st to 10th	Night	24% 8% 32% 26% 10%	380
	11th to 20th	Night	21% 8% 28% 32% 9% 1	374
	21st to end	Night	17% 9% 33% 32% 9%	411
June	1st to 10th	Night	17% 9% 32% 34% 7% 1	380
	11th to 20th	Night	19% 8% 24% 34% 14% 1	380
	21st to end	Night	21% 6% 21% 38% 14% 1	380
July	1st to 10th	Night	14% 4 24% 42% 15% 1	370
	11th to 20th	Night	13% 4 19% 43% 20%	368
	21st to end	Night	11% 5% 22% 42% 19% 2	416
August	1st to 10th	Night	11% 7% 19% 42% 20% 1	384
	11th to 20th	Night	14% 3 15% 36% 29% 3	564
	21st to end	Night	18% 6% 22% 32% 20% 2	816
September	1st to 10th	Night	17% 6% 26% 30% 19% 2	760
	11th to 20th	Night	19% 6% 21% 29% 23% 2	760
	21st to end	Night	23% 8% 22% 26% 20% 2	760
October	1st to 10th	Night	25% 9% 28% 22% 15% 2	760
	11th to 20th	Night	30% 12% 25% 21% 9% 1	760
	21st to end	Night	32% 10% 26% 25% 7%	836
November	1st to 10th	Night	31% 12% 24% 24% 7% 1	780
	11th to 20th	Night	26% 16% 27% 21% 10% 1	800
	21st to end	Night	34% 15% 23% 22% 6% 1	800
December	1st to 10th	Night	32% 14% 28% 20% 6%	783
	11th to 20th	Night	29% 13% 27% 24% 6% 1	760
	21st to end	Night	35% 13% 24% 22% 5% 1	836

Page generated at 2024-12-03 06:45:10. Version ac07

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