Musquodoboit Harbour
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Musquodoboit Harbour clear sky chart from 2005-11-06 to 2024-11-04.

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	22% 11% 4 8% 5% 4 4 3 5% 6% 28%	101586
	Night	23% 11% 3 8% 5% 4 4 3 5% 6% 29%	97526
Transparency	Day	55% 7% 12% 17% 8% 1	105160
	Night	54% 7% 12% 18% 8% 1	102043
Seeing	Day	29% 18% 30% 17% 5% 1	17417
	Night	28% 16% 30% 21% 5%	25110

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	15% 13% 5% 10% 6% 5% 5% 3 4 5% 29%	2526
	11th to 20th	Day	17% 14% 6% 13% 7% 5% 5% 3 5% 6% 19%	2544
	21st to end	Day	18% 11% 4 8% 6% 6% 5% 4 6% 8% 25%	3124
February	1st to 10th	Day	23% 14% 4 8% 7% 5% 5% 3 5% 5% 23%	1710
	11th to 20th	Day	18% 15% 4 11% 6% 5% 4 3 4 5% 24%	1663
	21st to end	Day	14% 16% 4 8% 7% 4 4 3 5% 6% 30%	1475
March	1st to 10th	Day	25% 15% 4 8% 5% 5% 3 3 3 4 26%	3355
	11th to 20th	Day	16% 22% 6% 10% 6% 4 4 3 3 4 23%	3480
	21st to end	Day	32% 14% 4 10% 5% 4 3 3 3 3 21%	3865
April	1st to 10th	Day	27% 14% 4 8% 4 4 3 3 3 5% 25%	2280
	11th to 20th	Day	22% 11% 3 7% 5% 3 3 3 5% 7% 30%	2273
	21st to end	Day	25% 11% 3 6% 5% 4 3 3 5% 6% 28%	2470
May	1st to 10th	Day	28% 13% 3 9% 5% 5% 4 3 4 6% 20%	4284
	11th to 20th	Day	25% 11% 3 7% 5% 4 3 3 4 6% 29%	4398
	21st to end	Day	21% 11% 3 7% 4 4 4 4 6% 8% 28%	4836
June	1st to 10th	Day	27% 11% 3 8% 5% 4 4 4 5% 7% 22%	2660
	11th to 20th	Day	24% 9% 2 6% 4 4 3 3 5% 7% 32%	2660
	21st to end	Day	31% 10% 3 7% 4 4 4 3 5% 6% 24%	2660
July	1st to 10th	Day	22% 11% 3 7% 4 4 4 4 6% 7% 27%	4440
	11th to 20th	Day	18% 12% 4 8% 4 4 4 4 6% 7% 27%	4440
	21st to end	Day	22% 10% 3 7% 4 4 4 3 5% 7% 30%	4760
August	1st to 10th	Day	25% 11% 3 7% 5% 5% 4 3 5% 7% 24%	4105
	11th to 20th	Day	20% 7% 2 7% 4 4 5% 5% 7% 7% 31%	4045
	21st to end	Day	11% 6% 2 6% 4 4 5% 5% 7% 8% 43%	4287
September	1st to 10th	Day	18% 7% 2 6% 5% 4 3 3 5% 8% 38%	2280
	11th to 20th	Day	21% 7% 2 6% 4 3 3 4 4 7% 38%	2259
	21st to end	Day	21% 6% 3 7% 4 3 4 3 5% 7% 38%	1996
October	1st to 10th	Day	20% 6% 2 7% 4 4 4 4 6% 7% 36%	1900
	11th to 20th	Day	20% 8% 2 7% 4 4 4 3 5% 8% 33%	1900
	21st to end	Day	22% 9% 3 7% 6% 4 4 3 5% 6% 32%	2067
November	1st to 10th	Day	24% 10% 4 7% 4 5% 4 3 5% 6% 27%	1595
	11th to 20th	Day	24% 11% 3 8% 5% 3 3 4 6% 4 29%	1520
	21st to end	Day	20% 12% 4 9% 6% 4 5% 3 5% 6% 25%	1520
December	1st to 10th	Day	26% 13% 4 9% 5% 4 4 3 4 6% 23%	1520
	11th to 20th	Day	32% 12% 3 8% 6% 4 3 4 3 5% 21%	1906
	21st to end	Day	24% 10% 8% 11% 5% 4 3 2 3 5% 25%	2783
January	1st to 10th	Night	16% 11% 5% 10% 6% 5% 4 3 5% 6% 29%	4429
	11th to 20th	Night	20% 13% 4 14% 6% 5% 4 3 5% 5% 20%	4408
	21st to end	Night	18% 11% 4 11% 6% 5% 5% 4 5% 5% 24%	4532
February	1st to 10th	Night	21% 11% 4 9% 7% 6% 4 4 4 6% 22%	2470
	11th to 20th	Night	19% 12% 4 9% 7% 5% 5% 4 5% 6% 24%	2403
	21st to end	Night	13% 13% 5% 10% 8% 5% 5% 4 5% 5% 28%	1979
March	1st to 10th	Night	23% 12% 4 9% 6% 6% 4 3 5% 5% 23%	3482
	11th to 20th	Night	23% 15% 5% 8% 5% 4 5% 3 5% 5% 23%	3479
	21st to end	Night	32% 12% 5% 10% 4 3 2 2 2 3 24%	3767
April	1st to 10th	Night	25% 13% 3 6% 5% 4 4 3 4 4 28%	1900
	11th to 20th	Night	23% 12% 3 7% 4 4 4 3 4 4 32%	1854
	21st to end	Night	25% 11% 4 6% 4 3 3 3 5% 5% 31%	1710
May	1st to 10th	Night	25% 16% 4 9% 4 4 4 3 4 6% 22%	2662
	11th to 20th	Night	26% 10% 3 7% 4 4 4 4 5% 6% 29%	2506
	21st to end	Night	24% 11% 4 8% 5% 4 4 3 4 6% 26%	2749
June	1st to 10th	Night	30% 11% 3 6% 4 3 3 4 4 5% 25%	1520
	11th to 20th	Night	24% 9% 3 6% 4 4 4 2 4 5% 35%	1520
	21st to end	Night	31% 11% 3 7% 4 4 5% 3 4 5% 23%	1520
July	1st to 10th	Night	22% 11% 4 10% 6% 5% 4 3 6% 7% 22%	2530
	11th to 20th	Night	21% 13% 4 9% 4 5% 5% 3 4 6% 26%	2530
	21st to end	Night	22% 9% 3 6% 4 4 4 3 5% 7% 34%	2800
August	1st to 10th	Night	26% 11% 3 6% 3 3 3 3 5% 6% 31%	2825
	11th to 20th	Night	19% 11% 3 7% 3 4 5% 4 6% 7% 32%	2782
	21st to end	Night	13% 6% 2 5% 4 3 4 3 5% 5% 51%	3368
September	1st to 10th	Night	19% 6% 2 5% 3 3 4 3 6% 6% 43%	1900
	11th to 20th	Night	20% 7% 2 5% 3 3 3 3 5% 5% 44%	1919
	21st to end	Night	23% 8% 3 6% 4 3 3 3 4 5% 38%	2183
October	1st to 10th	Night	20% 7% 2 6% 3 4 4 3 5% 7% 40%	2280
	11th to 20th	Night	21% 6% 2 5% 5% 3 5% 3 3 7% 40%	2280
	21st to end	Night	26% 9% 2 6% 4 4 4 3 3 6% 33%	2529
November	1st to 10th	Night	23% 9% 3 7% 5% 4 4 3 5% 6% 32%	2553
	11th to 20th	Night	22% 10% 3 7% 6% 4 4 3 5% 6% 29%	2660
	21st to end	Night	22% 10% 3 8% 5% 4 4 3 4 7% 30%	2660
December	1st to 10th	Night	25% 12% 4 8% 5% 5% 4 3 5% 6% 24%	2660
	11th to 20th	Night	33% 12% 3 8% 5% 4 3 2 4 5% 22%	3293
	21st to end	Night	27% 10% 5% 10% 5% 3 4 3 4 5% 24%	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	55% 7% 17% 15% 6%	2527
	11th to 20th	Day	61% 8% 11% 15% 4	2544
	21st to end	Day	53% 9% 13% 14% 11%	3124
February	1st to 10th	Day	64% 5% 9% 12% 9% 1	1710
	11th to 20th	Day	61% 6% 11% 14% 7% 1	1671
	21st to end	Day	55% 5% 10% 16% 11% 3	1475
March	1st to 10th	Day	63% 4 9% 15% 8% 1	3359
	11th to 20th	Day	59% 9% 11% 13% 6% 1	3480
	21st to end	Day	68% 4 8% 11% 7% 1	3865
April	1st to 10th	Day	63% 5% 7% 13% 10% 2	2280
	11th to 20th	Day	53% 6% 9% 18% 12% 1	2273
	21st to end	Day	56% 5% 11% 16% 9% 2	2470
May	1st to 10th	Day	62% 9% 11% 13% 4 1	4298
	11th to 20th	Day	55% 8% 12% 18% 7%	4402
	21st to end	Day	51% 11% 16% 16% 6%	4836
June	1st to 10th	Day	60% 8% 12% 14% 5%	2660
	11th to 20th	Day	52% 7% 13% 19% 9% 1	2660
	21st to end	Day	61% 8% 10% 12% 7% 1	2660
July	1st to 10th	Day	55% 7% 12% 15% 10% 1	4370
	11th to 20th	Day	54% 8% 12% 19% 7%	4364
	21st to end	Day	52% 7% 14% 19% 8%	4608
August	1st to 10th	Day	59% 6% 13% 16% 5%	4092
	11th to 20th	Day	48% 8% 15% 23% 6%	4084
	21st to end	Day	36% 7% 15% 26% 15% 1	4287
September	1st to 10th	Day	45% 6% 13% 23% 13% 1	2280
	11th to 20th	Day	44% 6% 12% 23% 13% 1	2259
	21st to end	Day	46% 6% 11% 23% 14%	1996
October	1st to 10th	Day	47% 7% 12% 21% 12%	3160
	11th to 20th	Day	41% 7% 12% 25% 15%	3140
	21st to end	Day	46% 4 15% 21% 12% 1	3383
November	1st to 10th	Day	56% 7% 10% 19% 7% 1	1595
	11th to 20th	Day	55% 7% 14% 15% 8% 1	1520
	21st to end	Day	58% 8% 13% 15% 6%	1520
December	1st to 10th	Day	63% 8% 9% 16% 5%	1520
	11th to 20th	Day	66% 5% 11% 13% 5%	1905
	21st to end	Day	62% 6% 15% 12% 5%	2783
January	1st to 10th	Night	53% 8% 16% 20% 3	4429
	11th to 20th	Night	62% 8% 11% 13% 5%	4408
	21st to end	Night	58% 9% 12% 15% 6% 1	4532
February	1st to 10th	Night	62% 7% 10% 12% 8% 1	2470
	11th to 20th	Night	59% 7% 13% 14% 7% 1	2406
	21st to end	Night	56% 6% 11% 18% 8% 1	1979
March	1st to 10th	Night	61% 5% 10% 15% 7% 1	3491
	11th to 20th	Night	60% 8% 9% 15% 7% 1	3480
	21st to end	Night	66% 4 8% 15% 7% 1	3767
April	1st to 10th	Night	58% 6% 9% 14% 10% 2	1900
	11th to 20th	Night	53% 6% 9% 18% 12% 2	1854
	21st to end	Night	54% 6% 12% 16% 11% 2	1710
May	1st to 10th	Night	60% 10% 9% 13% 7% 1	2668
	11th to 20th	Night	54% 8% 12% 18% 6%	2507
	21st to end	Night	56% 10% 13% 15% 5% 1	2750
June	1st to 10th	Night	60% 7% 10% 17% 6%	1520
	11th to 20th	Night	53% 5% 10% 20% 12% 1	1520
	21st to end	Night	63% 7% 10% 13% 6% 1	1520
July	1st to 10th	Night	59% 8% 11% 13% 8% 1	2491
	11th to 20th	Night	55% 8% 13% 15% 9%	2482
	21st to end	Night	50% 7% 12% 19% 12% 1	2712
August	1st to 10th	Night	54% 6% 13% 23% 4	2813
	11th to 20th	Night	49% 8% 16% 21% 6%	2809
	21st to end	Night	33% 6% 14% 29% 16% 1	3367
September	1st to 10th	Night	40% 7% 13% 24% 14% 1	1900
	11th to 20th	Night	41% 4 13% 27% 13% 1	1919
	21st to end	Night	48% 6% 9% 24% 12% 1	2183
October	1st to 10th	Night	48% 6% 13% 22% 10%	3800
	11th to 20th	Night	36% 6% 12% 28% 17%	3779
	21st to end	Night	44% 5% 14% 22% 15%	4165
November	1st to 10th	Night	52% 7% 13% 19% 9% 1	2553
	11th to 20th	Night	53% 7% 13% 17% 9%	2660
	21st to end	Night	55% 7% 16% 16% 6%	2660
December	1st to 10th	Night	61% 8% 12% 15% 4	2660
	11th to 20th	Night	65% 5% 9% 14% 6%	3295
	21st to end	Night	61% 7% 12% 16% 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	33% 23% 30% 13% 1	370
	11th to 20th	Day	32% 21% 31% 11% 4	370
	21st to end	Day	27% 22% 36% 13% 3	407
February	1st to 10th	Day	34% 22% 27% 13% 3	370
	11th to 20th	Day	34% 27% 26% 11% 1	366
	21st to end	Day	27% 23% 33% 13% 3 1	307
March	1st to 10th	Day	27% 26% 34% 10% 3	436
	11th to 20th	Day	31% 24% 29% 13% 3	460
	21st to end	Day	34% 24% 29% 10% 3 1	506
April	1st to 10th	Day	40% 26% 23% 9% 2	460
	11th to 20th	Day	30% 27% 31% 10% 2	452
	21st to end	Day	30% 22% 29% 14% 5% 1	460
May	1st to 10th	Day	36% 18% 29% 13% 3 1	563
	11th to 20th	Day	27% 17% 32% 19% 4 1	674
	21st to end	Day	32% 15% 34% 17% 2 1	735
June	1st to 10th	Day	32% 17% 28% 17% 5%	680
	11th to 20th	Day	27% 15% 31% 20% 5% 1	680
	21st to end	Day	37% 10% 29% 18% 5% 1	680
July	1st to 10th	Day	24% 13% 32% 22% 8%	670
	11th to 20th	Day	23% 11% 33% 22% 9% 1	668
	21st to end	Day	29% 10% 31% 23% 6% 1	709
August	1st to 10th	Day	20% 10% 37% 24% 7% 2	486
	11th to 20th	Day	24% 10% 33% 20% 11% 2	479
	21st to end	Day	19% 16% 28% 25% 10% 3	539
September	1st to 10th	Day	21% 13% 34% 24% 7% 1	490
	11th to 20th	Day	25% 17% 26% 20% 10% 2	490
	21st to end	Day	21% 15% 30% 23% 8% 2	440
October	1st to 10th	Day	23% 12% 34% 20% 9% 2	390
	11th to 20th	Day	25% 20% 29% 17% 8% 2	390
	21st to end	Day	29% 22% 30% 13% 6% 1	429
November	1st to 10th	Day	29% 18% 30% 16% 6% 2	374
	11th to 20th	Day	31% 24% 25% 14% 6% 1	370
	21st to end	Day	31% 25% 29% 11% 4 1	370
December	1st to 10th	Day	36% 19% 29% 14% 2	370
	11th to 20th	Day	40% 27% 21% 12% 1	370
	21st to end	Day	28% 26% 30% 12% 3 1	407
January	1st to 10th	Night	31% 20% 33% 14% 2	850
	11th to 20th	Night	32% 21% 31% 14% 2	841
	21st to end	Night	25% 22% 35% 16% 2	836
February	1st to 10th	Night	28% 21% 30% 18% 2	760
	11th to 20th	Night	27% 27% 30% 15% 1	743
	21st to end	Night	22% 20% 35% 19% 4	628
March	1st to 10th	Night	26% 21% 35% 15% 2	760
	11th to 20th	Night	25% 19% 29% 21% 5%	760
	21st to end	Night	30% 18% 30% 18% 4	812
April	1st to 10th	Night	34% 16% 29% 17% 4	570
	11th to 20th	Night	29% 16% 35% 16% 3	564
	21st to end	Night	30% 14% 31% 19% 4 1	570
May	1st to 10th	Night	33% 13% 31% 17% 5% 1	570
	11th to 20th	Night	28% 12% 27% 25% 7% 1	562
	21st to end	Night	25% 14% 36% 22% 4	616
June	1st to 10th	Night	37% 10% 29% 21% 3	570
	11th to 20th	Night	28% 10% 33% 24% 5%	570
	21st to end	Night	32% 8% 30% 23% 7%	570
July	1st to 10th	Night	24% 8% 28% 33% 7%	556
	11th to 20th	Night	24% 8% 29% 31% 7%	552
	21st to end	Night	22% 9% 28% 30% 10%	623
August	1st to 10th	Night	21% 6% 28% 32% 12% 1	568
	11th to 20th	Night	23% 7% 25% 33% 12%	562
	21st to end	Night	21% 8% 23% 34% 14% 1	627
September	1st to 10th	Night	21% 6% 33% 29% 11%	570
	11th to 20th	Night	23% 12% 24% 29% 11% 1	589
	21st to end	Night	26% 11% 28% 25% 8% 1	760
October	1st to 10th	Night	24% 9% 28% 29% 9% 1	760
	11th to 20th	Night	24% 14% 31% 21% 10% 1	760
	21st to end	Night	32% 16% 29% 17% 4	848
November	1st to 10th	Night	29% 14% 31% 20% 5% 1	848
	11th to 20th	Night	28% 19% 27% 20% 4	850
	21st to end	Night	29% 21% 28% 18% 4	850
December	1st to 10th	Night	34% 18% 32% 14% 3	850
	11th to 20th	Night	34% 21% 30% 12% 2	850
	21st to end	Night	30% 22% 29% 16% 2	935

Page generated at 2024-11-01 23:47:41. Version ac07

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