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 2025-09-04.

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	21% 11% 4 8% 5% 4 4 3 5% 6% 28%	126593
	Night	22% 11% 4 8% 5% 4 4 3 4 6% 29%	122304
Transparency	Day	55% 7% 12% 17% 8% 1	130149
	Night	55% 6% 11% 18% 9% 1	126838
Seeing	Day	29% 18% 30% 16% 5% 1	18598
	Night	28% 16% 30% 21% 5%	26244

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	14% 16% 6% 13% 7% 6% 5% 3 4 4 22%	3616
	11th to 20th	Day	15% 15% 7% 14% 7% 6% 5% 3 5% 5% 18%	3618
	21st to end	Day	15% 12% 4 7% 5% 6% 5% 4 5% 7% 29%	4466
February	1st to 10th	Day	22% 14% 4 8% 7% 5% 5% 3 4 5% 23%	1800
	11th to 20th	Day	17% 15% 5% 12% 6% 5% 4 3 4 5% 24%	1753
	21st to end	Day	14% 16% 4 7% 7% 5% 4 3 5% 6% 30%	1550
March	1st to 10th	Day	23% 15% 4 12% 5% 4 3 2 3 4 24%	4813
	11th to 20th	Day	18% 19% 5% 9% 5% 3 3 3 4 5% 28%	4980
	21st to end	Day	28% 14% 4 11% 5% 5% 3 3 4 4 21%	5529
April	1st to 10th	Day	28% 14% 4 8% 4 4 3 3 3 4 25%	2400
	11th to 20th	Day	22% 11% 3 7% 5% 4 3 3 5% 7% 29%	2394
	21st to end	Day	25% 11% 3 7% 5% 4 4 3 5% 6% 28%	2600
May	1st to 10th	Day	29% 14% 3 8% 5% 5% 5% 3 5% 6% 18%	6134
	11th to 20th	Day	25% 11% 3 8% 5% 4 4 3 4 5% 28%	6318
	21st to end	Day	22% 12% 3 7% 4 4 4 3 5% 7% 29%	6948
June	1st to 10th	Day	26% 11% 3 8% 5% 4 4 4 5% 7% 23%	2800
	11th to 20th	Day	23% 9% 2 6% 4 4 4 3 5% 7% 31%	2800
	21st to end	Day	30% 10% 3 7% 4 4 4 3 5% 6% 24%	2800
July	1st to 10th	Day	21% 11% 3 8% 5% 4 5% 5% 6% 8% 24%	6360
	11th to 20th	Day	17% 11% 4 9% 5% 4 5% 4 5% 7% 29%	6360
	21st to end	Day	16% 8% 3 6% 4 4 4 4 6% 8% 36%	6844
August	1st to 10th	Day	25% 11% 3 7% 5% 4 3 3 5% 7% 26%	4235
	11th to 20th	Day	20% 7% 2 7% 4 4 5% 5% 7% 7% 31%	4175
	21st to end	Day	11% 6% 2 6% 4 4 5% 5% 7% 8% 43%	4422
September	1st to 10th	Day	18% 7% 2 6% 5% 4 3 3 5% 8% 38%	2316
	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 4 5% 6% 27%	1652
	11th to 20th	Day	24% 12% 4 8% 5% 3 3 4 5% 4 28%	1600
	21st to end	Day	20% 13% 4 10% 6% 4 5% 3 5% 6% 24%	1600
December	1st to 10th	Day	21% 11% 5% 11% 6% 5% 4 4 4 7% 23%	2610
	11th to 20th	Day	31% 11% 3 7% 5% 4 4 3 3 4 26%	2996
	21st to end	Day	21% 12% 7% 11% 5% 3 3 2 4 5% 27%	3982
January	1st to 10th	Night	14% 15% 5% 12% 6% 5% 4 3 5% 6% 24%	6349
	11th to 20th	Night	17% 14% 5% 16% 6% 5% 5% 3 5% 5% 19%	6268
	21st to end	Night	13% 11% 4 11% 7% 5% 5% 4 6% 6% 27%	6490
February	1st to 10th	Night	21% 11% 4 10% 7% 6% 4 4 4 5% 22%	2600
	11th to 20th	Night	19% 12% 4 9% 7% 5% 5% 4 5% 6% 25%	2533
	21st to end	Night	14% 13% 5% 10% 8% 5% 4 4 5% 5% 28%	2079
March	1st to 10th	Night	25% 12% 4 10% 7% 5% 4 3 4 4 22%	5010
	11th to 20th	Night	23% 14% 5% 7% 4 3 4 3 4 5% 28%	4979
	21st to end	Night	30% 13% 4 10% 4 3 3 2 3 4 24%	5403
April	1st to 10th	Night	26% 13% 3 6% 5% 4 4 3 4 4 28%	2000
	11th to 20th	Night	23% 12% 3 7% 4 4 4 3 4 4 31%	1953
	21st to end	Night	24% 11% 4 7% 4 3 3 3 5% 6% 31%	1800
May	1st to 10th	Night	29% 16% 3 9% 4 4 3 3 4 5% 20%	3817
	11th to 20th	Night	28% 13% 3 6% 4 3 4 3 4 6% 28%	3596
	21st to end	Night	20% 15% 4 8% 4 4 4 3 4 6% 29%	3948
June	1st to 10th	Night	30% 11% 3 6% 4 3 3 4 4 5% 27%	1600
	11th to 20th	Night	24% 9% 3 6% 4 4 4 2 4 5% 35%	1600
	21st to end	Night	30% 10% 3 7% 4 4 5% 3 4 6% 24%	1600
July	1st to 10th	Night	21% 11% 4 10% 6% 6% 5% 4 5% 7% 21%	3619
	11th to 20th	Night	21% 12% 3 8% 4 5% 5% 3 4 5% 29%	3620
	21st to end	Night	19% 8% 3 6% 4 4 4 3 6% 8% 35%	4024
August	1st to 10th	Night	25% 11% 3 5% 3 3 3 3 5% 6% 32%	2915
	11th to 20th	Night	19% 11% 3 7% 3 4 5% 4 6% 7% 32%	2872
	21st to end	Night	13% 6% 2 5% 4 3 4 3 5% 5% 51%	3475
September	1st to 10th	Night	18% 6% 2 6% 3 3 4 3 6% 6% 43%	1931
	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	22% 9% 3 7% 5% 4 4 3 5% 6% 32%	2643
	11th to 20th	Night	22% 11% 3 7% 6% 4 4 3 5% 6% 28%	2800
	21st to end	Night	23% 11% 3 8% 5% 4 4 3 4 7% 29%	2800
December	1st to 10th	Night	17% 10% 4 11% 6% 5% 5% 4 5% 7% 26%	4580
	11th to 20th	Night	28% 12% 2 7% 4 4 3 3 4 5% 28%	5213
	21st to end	Night	25% 11% 5% 9% 4 3 3 3 4 5% 28%	6996

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	62% 7% 12% 12% 6%	3617
	11th to 20th	Day	63% 8% 12% 14% 3	3647
	21st to end	Day	51% 8% 11% 12% 15% 4	4466
February	1st to 10th	Day	63% 5% 9% 12% 9% 1	1800
	11th to 20th	Day	61% 6% 11% 14% 7% 1	1761
	21st to end	Day	55% 6% 11% 16% 10% 3	1550
March	1st to 10th	Day	65% 3 8% 11% 8% 4	4817
	11th to 20th	Day	56% 7% 14% 17% 6% 1	4980
	21st to end	Day	67% 4 7% 14% 8% 1	5529
April	1st to 10th	Day	63% 4 7% 13% 10% 3	2400
	11th to 20th	Day	54% 6% 9% 18% 12% 1	2394
	21st to end	Day	56% 5% 11% 17% 9% 2	2600
May	1st to 10th	Day	64% 7% 10% 13% 5%	6145
	11th to 20th	Day	57% 8% 11% 19% 6%	6322
	21st to end	Day	52% 8% 14% 17% 8%	6948
June	1st to 10th	Day	59% 8% 12% 15% 6%	2800
	11th to 20th	Day	52% 7% 12% 19% 9% 1	2800
	21st to end	Day	61% 8% 10% 13% 8% 1	2800
July	1st to 10th	Day	56% 6% 15% 14% 8% 1	6290
	11th to 20th	Day	52% 7% 11% 22% 8%	6284
	21st to end	Day	44% 7% 18% 23% 9%	6648
August	1st to 10th	Day	58% 6% 13% 17% 7%	4222
	11th to 20th	Day	48% 8% 15% 23% 6%	4214
	21st to end	Day	37% 7% 15% 27% 15% 1	4422
September	1st to 10th	Day	45% 6% 13% 23% 12% 1	2316
	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	1652
	11th to 20th	Day	57% 7% 14% 15% 7% 1	1600
	21st to end	Day	59% 8% 12% 14% 6%	1600
December	1st to 10th	Day	59% 7% 11% 20% 3	2610
	11th to 20th	Day	62% 4 10% 14% 9%	2995
	21st to end	Day	60% 6% 12% 15% 7%	3982
January	1st to 10th	Night	59% 8% 12% 18% 3	6349
	11th to 20th	Night	64% 7% 11% 14% 4	6314
	21st to end	Night	54% 9% 11% 16% 10% 1	6490
February	1st to 10th	Night	63% 7% 9% 12% 8% 2	2600
	11th to 20th	Night	59% 6% 13% 14% 7% 1	2536
	21st to end	Night	56% 6% 10% 19% 8% 1	2079
March	1st to 10th	Night	65% 4 7% 12% 10% 2	5019
	11th to 20th	Night	57% 6% 11% 18% 8% 1	4980
	21st to end	Night	65% 4 6% 17% 7% 1	5403
April	1st to 10th	Night	59% 6% 9% 14% 10% 2	2000
	11th to 20th	Night	54% 6% 9% 18% 11% 2	1953
	21st to end	Night	53% 6% 12% 17% 11% 1	1800
May	1st to 10th	Night	64% 8% 7% 13% 7% 1	3823
	11th to 20th	Night	57% 7% 10% 20% 6% 1	3597
	21st to end	Night	55% 8% 11% 19% 6%	3949
June	1st to 10th	Night	59% 7% 9% 18% 7% 1	1600
	11th to 20th	Night	52% 5% 10% 20% 12% 1	1600
	21st to end	Night	62% 7% 10% 13% 7% 1	1600
July	1st to 10th	Night	60% 7% 12% 15% 7% 1	3581
	11th to 20th	Night	53% 6% 12% 19% 10% 1	3572
	21st to end	Night	46% 7% 14% 21% 12%	3906
August	1st to 10th	Night	53% 6% 13% 23% 5%	2903
	11th to 20th	Night	48% 8% 16% 22% 6%	2899
	21st to end	Night	34% 6% 14% 29% 16% 1	3474
September	1st to 10th	Night	41% 7% 13% 24% 14% 1	1931
	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	2643
	11th to 20th	Night	54% 7% 13% 17% 8% 1	2800
	21st to end	Night	56% 7% 15% 16% 5%	2800
December	1st to 10th	Night	54% 8% 13% 21% 4	4580
	11th to 20th	Night	58% 5% 9% 17% 9% 1	5215
	21st to end	Night	58% 6% 11% 17% 8%	6996

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	35% 23% 29% 12% 1	400
	11th to 20th	Day	33% 20% 30% 12% 5%	400
	21st to end	Day	27% 23% 36% 12% 3	440
February	1st to 10th	Day	35% 22% 27% 13% 3	400
	11th to 20th	Day	35% 27% 26% 11% 1	396
	21st to end	Day	28% 23% 32% 14% 3 1	331
March	1st to 10th	Day	29% 26% 34% 10% 2	473
	11th to 20th	Day	31% 24% 29% 13% 3	500
	21st to end	Day	33% 25% 29% 10% 3 1	550
April	1st to 10th	Day	42% 26% 22% 8% 2	500
	11th to 20th	Day	32% 27% 29% 9% 2	492
	21st to end	Day	29% 24% 29% 13% 5% 1	500
May	1st to 10th	Day	36% 18% 30% 12% 3 1	608
	11th to 20th	Day	28% 17% 31% 18% 4 1	724
	21st to end	Day	32% 15% 33% 17% 3 1	790
June	1st to 10th	Day	32% 16% 29% 17% 5%	730
	11th to 20th	Day	26% 17% 31% 19% 5% 1	730
	21st to end	Day	37% 11% 29% 17% 5% 1	730
July	1st to 10th	Day	24% 14% 32% 22% 8%	720
	11th to 20th	Day	23% 11% 33% 23% 9% 1	718
	21st to end	Day	28% 10% 32% 22% 6% 1	762
August	1st to 10th	Day	19% 10% 38% 24% 7% 2	526
	11th to 20th	Day	23% 10% 34% 20% 11% 2	519
	21st to end	Day	19% 17% 29% 24% 9% 2	583
September	1st to 10th	Day	20% 13% 34% 24% 7% 2	502
	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	28% 19% 31% 15% 6% 2	395
	11th to 20th	Day	34% 23% 24% 13% 5% 1	400
	21st to end	Day	32% 25% 29% 10% 3 1	400
December	1st to 10th	Day	35% 20% 30% 14% 2	400
	11th to 20th	Day	39% 27% 21% 12% 1	400
	21st to end	Day	27% 26% 31% 12% 3 1	440
January	1st to 10th	Night	31% 21% 33% 14% 2	900
	11th to 20th	Night	31% 21% 31% 15% 3	890
	21st to end	Night	25% 23% 34% 15% 2	880
February	1st to 10th	Night	29% 22% 29% 18% 2	800
	11th to 20th	Night	28% 26% 30% 15% 1	783
	21st to end	Night	22% 20% 35% 19% 4	660
March	1st to 10th	Night	28% 21% 34% 15% 2	800
	11th to 20th	Night	26% 19% 29% 21% 5%	800
	21st to end	Night	31% 18% 30% 17% 4	855
April	1st to 10th	Night	35% 16% 29% 17% 3	600
	11th to 20th	Night	30% 16% 35% 16% 3	594
	21st to end	Night	30% 15% 31% 19% 4 1	600
May	1st to 10th	Night	34% 13% 31% 17% 5% 1	600
	11th to 20th	Night	28% 12% 28% 24% 7% 1	592
	21st to end	Night	24% 14% 35% 21% 4	649
June	1st to 10th	Night	36% 10% 30% 22% 3	600
	11th to 20th	Night	27% 10% 33% 24% 5%	600
	21st to end	Night	32% 9% 30% 24% 7%	600
July	1st to 10th	Night	24% 8% 29% 33% 7%	586
	11th to 20th	Night	24% 8% 29% 32% 7%	582
	21st to end	Night	23% 9% 28% 30% 10%	656
August	1st to 10th	Night	20% 6% 28% 33% 12% 1	598
	11th to 20th	Night	22% 7% 25% 34% 11%	592
	21st to end	Night	20% 8% 24% 33% 13% 1	660
September	1st to 10th	Night	21% 6% 32% 29% 11%	580
	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% 15% 30% 20% 5% 1	880
	11th to 20th	Night	31% 18% 27% 20% 4	900
	21st to end	Night	31% 21% 27% 17% 3	900
December	1st to 10th	Night	33% 17% 32% 15% 4	900
	11th to 20th	Night	34% 21% 30% 13% 2	900
	21st to end	Night	30% 22% 29% 16% 3	990

Page generated at 2025-09-01 02:51:03. Version ac07

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