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 2024-03-28.

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% 10% 4 7% 6% 3 4 4 5% 6% 29%	78687
	Night	22% 10% 4 7% 6% 3 4 4 5% 6% 29%	81328
Transparency	Day	55% 7% 12% 17% 8% 1	78392
	Night	55% 7% 12% 18% 8% 1	81158
Seeing	Day	29% 18% 30% 17% 5% 1	16486
	Night	28% 16% 30% 21% 5%	24393

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% 12% 5% 8% 8% 4 5% 4 4 5% 29%	2526
	11th to 20th	Day	17% 14% 6% 11% 9% 4 5% 4 5% 6% 20%	2544
	21st to end	Day	19% 11% 4 7% 7% 4 6% 5% 5% 8% 25%	3124
February	1st to 10th	Day	23% 13% 5% 8% 7% 4 5% 5% 4 5% 23%	1710
	11th to 20th	Day	18% 14% 5% 10% 7% 4 4 4 4 6% 24%	1663
	21st to end	Day	14% 14% 5% 7% 6% 4 5% 3 4 7% 30%	1475
March	1st to 10th	Day	18% 15% 5% 10% 6% 4 5% 4 4 4 25%	2034
	11th to 20th	Day	17% 12% 6% 9% 8% 3 5% 4 4 5% 29%	2090
	21st to end	Day	20% 14% 5% 9% 5% 3 4 3 4 4 28%	2277
April	1st to 10th	Day	28% 13% 4 7% 5% 3 4 3 3 5% 24%	2160
	11th to 20th	Day	23% 10% 4 6% 6% 2 3 4 5% 6% 31%	2152
	21st to end	Day	27% 11% 4 6% 5% 3 4 4 4 6% 27%	2340
May	1st to 10th	Day	29% 11% 3 6% 6% 3 4 5% 5% 6% 24%	2434
	11th to 20th	Day	23% 9% 4 5% 6% 3 3 4 5% 7% 31%	2478
	21st to end	Day	25% 10% 4 5% 5% 3 4 3 5% 6% 29%	2724
June	1st to 10th	Day	28% 9% 3 7% 6% 3 4 5% 4 7% 23%	2520
	11th to 20th	Day	25% 9% 3 5% 5% 3 4 4 5% 7% 30%	2520
	21st to end	Day	30% 9% 4 6% 5% 3 4 4 5% 6% 25%	2520
July	1st to 10th	Day	20% 9% 4 5% 4 3 4 5% 6% 10% 31%	2520
	11th to 20th	Day	22% 9% 4 5% 5% 3 4 5% 6% 8% 30%	2520
	21st to end	Day	25% 10% 3 6% 5% 3 4 5% 5% 7% 26%	2716
August	1st to 10th	Day	19% 7% 3 6% 5% 3 5% 4 6% 9% 32%	2327
	11th to 20th	Day	20% 7% 3 7% 5% 3 4 6% 7% 7% 32%	2304
	21st to end	Day	17% 8% 3 6% 4 3 4 5% 5% 7% 39%	2441
September	1st to 10th	Day	18% 6% 3 5% 5% 4 4 4 5% 8% 38%	2160
	11th to 20th	Day	22% 7% 2 5% 4 2 3 5% 4 8% 37%	2141
	21st to end	Day	21% 5% 3 5% 5% 2 4 4 4 7% 39%	1891
October	1st to 10th	Day	21% 5% 3 6% 5% 2 4 5% 6% 7% 37%	1800
	11th to 20th	Day	21% 8% 2 7% 5% 3 5% 4 5% 8% 32%	1800
	21st to end	Day	23% 8% 4 7% 7% 3 4 4 4 5% 31%	1959
November	1st to 10th	Day	25% 9% 4 6% 5% 4 4 4 5% 6% 28%	1568
	11th to 20th	Day	24% 10% 4 7% 6% 3 3 5% 5% 4 29%	1520
	21st to end	Day	20% 12% 4 8% 7% 3 5% 4 5% 6% 26%	1520
December	1st to 10th	Day	26% 12% 5% 7% 6% 3 4 4 4 6% 23%	1520
	11th to 20th	Day	32% 11% 3 7% 6% 3 4 4 3 6% 21%	1906
	21st to end	Day	24% 9% 8% 10% 6% 3 4 3 3 5% 25%	2783
January	1st to 10th	Night	16% 10% 5% 9% 8% 4 5% 4 5% 6% 29%	4429
	11th to 20th	Night	21% 13% 4 13% 7% 4 5% 4 4 5% 20%	4408
	21st to end	Night	18% 11% 5% 9% 8% 4 6% 5% 5% 5% 24%	4532
February	1st to 10th	Night	22% 10% 5% 9% 8% 5% 5% 5% 5% 6% 22%	2470
	11th to 20th	Night	19% 11% 5% 9% 7% 4 5% 4 5% 6% 25%	2403
	21st to end	Night	14% 12% 6% 8% 9% 4 5% 5% 4 5% 28%	1979
March	1st to 10th	Night	18% 12% 4 8% 7% 4 6% 5% 5% 6% 25%	2130
	11th to 20th	Night	22% 8% 3 6% 6% 3 5% 5% 6% 7% 29%	2089
	21st to end	Night	21% 11% 5% 8% 5% 2 4 3 3 5% 32%	2234
April	1st to 10th	Night	26% 12% 4 5% 6% 3 5% 4 4 4 27%	1800
	11th to 20th	Night	24% 11% 4 6% 5% 3 4 4 4 4 32%	1756
	21st to end	Night	26% 11% 4 5% 5% 2 3 4 5% 6% 30%	1620
May	1st to 10th	Night	29% 10% 3 6% 3 2 4 4 5% 6% 27%	1526
	11th to 20th	Night	25% 7% 2 5% 5% 4 4 5% 4 7% 31%	1416
	21st to end	Night	21% 10% 4 6% 6% 3 5% 5% 4 7% 29%	1550
June	1st to 10th	Night	31% 10% 3 5% 5% 2 4 4 4 5% 26%	1440
	11th to 20th	Night	25% 9% 3 6% 5% 3 5% 3 4 5% 34%	1440
	21st to end	Night	31% 10% 3 7% 5% 3 5% 4 4 5% 24%	1440
July	1st to 10th	Night	20% 9% 3 6% 5% 3 3 4 7% 10% 30%	1440
	11th to 20th	Night	23% 11% 3 8% 5% 3 5% 5% 5% 6% 26%	1440
	21st to end	Night	22% 10% 4 5% 6% 3 6% 4 5% 8% 28%	1599
August	1st to 10th	Night	17% 9% 3 5% 5% 3 5% 4 5% 7% 36%	1612
	11th to 20th	Night	20% 10% 3 6% 4 3 5% 5% 5% 7% 32%	1596
	21st to end	Night	18% 7% 3 5% 5% 3 4 4 5% 5% 41%	1914
September	1st to 10th	Night	18% 6% 3 5% 4 2 4 5% 6% 7% 42%	1800
	11th to 20th	Night	21% 7% 2 5% 3 2 4 3 4 6% 43%	1818
	21st to end	Night	23% 8% 3 5% 5% 2 3 3 4 5% 38%	2068
October	1st to 10th	Night	20% 6% 3 5% 4 3 5% 4 5% 6% 40%	2160
	11th to 20th	Night	22% 6% 2 5% 6% 2 4 4 3 6% 39%	2160
	21st to end	Night	27% 8% 2 5% 5% 3 4 4 3 6% 32%	2395
November	1st to 10th	Night	24% 9% 3 6% 5% 2 4 5% 5% 6% 32%	2507
	11th to 20th	Night	22% 9% 3 6% 7% 3 4 5% 5% 7% 29%	2660
	21st to end	Night	22% 10% 4 6% 6% 3 4 4 4 7% 30%	2660
December	1st to 10th	Night	25% 12% 5% 7% 6% 3 5% 4 5% 6% 24%	2660
	11th to 20th	Night	33% 11% 3 7% 6% 3 4 3 4 5% 22%	3293
	21st to end	Night	27% 10% 6% 9% 6% 3 4 4 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	62% 5% 8% 15% 9% 1	2038
	11th to 20th	Day	57% 5% 12% 15% 10% 2	2090
	21st to end	Day	59% 4 10% 15% 10% 2	2277
April	1st to 10th	Day	63% 4 7% 13% 10% 3	2160
	11th to 20th	Day	53% 6% 8% 19% 12% 1	2152
	21st to end	Day	58% 5% 11% 17% 8% 1	2340
May	1st to 10th	Day	60% 6% 11% 15% 7% 1	2434
	11th to 20th	Day	53% 7% 10% 20% 10%	2482
	21st to end	Day	57% 7% 11% 17% 8% 1	2724
June	1st to 10th	Day	61% 8% 11% 15% 5%	2520
	11th to 20th	Day	54% 7% 11% 18% 8% 1	2520
	21st to end	Day	60% 8% 10% 13% 8%	2520
July	1st to 10th	Day	48% 10% 16% 17% 9%	2450
	11th to 20th	Day	51% 10% 13% 20% 6% 1	2444
	21st to end	Day	56% 8% 13% 17% 5%	2564
August	1st to 10th	Day	47% 9% 17% 19% 7% 1	2314
	11th to 20th	Day	47% 10% 17% 19% 7%	2304
	21st to end	Day	43% 7% 16% 23% 10% 1	2441
September	1st to 10th	Day	44% 6% 13% 23% 12% 1	2160
	11th to 20th	Day	45% 6% 12% 22% 13% 1	2141
	21st to end	Day	45% 6% 11% 23% 14%	1891
October	1st to 10th	Day	46% 6% 12% 24% 12% 1	1800
	11th to 20th	Day	49% 7% 16% 21% 7%	1800
	21st to end	Day	55% 5% 13% 20% 8%	1959
November	1st to 10th	Day	57% 7% 9% 19% 7% 1	1568
	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	57% 6% 12% 16% 9% 1	2139
	11th to 20th	Night	52% 7% 12% 16% 10% 2	2090
	21st to end	Night	55% 5% 10% 19% 10% 2	2234
April	1st to 10th	Night	59% 7% 9% 13% 10% 3	1800
	11th to 20th	Night	54% 6% 9% 17% 12% 2	1756
	21st to end	Night	55% 6% 12% 16% 10% 1	1620
May	1st to 10th	Night	57% 6% 9% 19% 8% 1	1526
	11th to 20th	Night	53% 6% 10% 20% 9% 1	1417
	21st to end	Night	54% 8% 13% 18% 6% 1	1551
June	1st to 10th	Night	60% 7% 9% 18% 6%	1440
	11th to 20th	Night	54% 5% 10% 18% 12% 1	1440
	21st to end	Night	62% 7% 10% 14% 7% 1	1440
July	1st to 10th	Night	49% 11% 14% 18% 7%	1401
	11th to 20th	Night	55% 10% 11% 16% 9%	1392
	21st to end	Night	54% 10% 13% 16% 7% 1	1511
August	1st to 10th	Night	46% 9% 15% 25% 6%	1600
	11th to 20th	Night	49% 10% 15% 17% 8%	1596
	21st to end	Night	43% 8% 14% 24% 11%	1914
September	1st to 10th	Night	40% 8% 14% 24% 13% 1	1800
	11th to 20th	Night	42% 4 13% 26% 13% 1	1818
	21st to end	Night	47% 6% 9% 24% 13% 1	2068
October	1st to 10th	Night	44% 5% 13% 24% 13% 1	2160
	11th to 20th	Night	45% 6% 12% 29% 7%	2160
	21st to end	Night	54% 5% 11% 18% 10%	2395
November	1st to 10th	Night	52% 7% 13% 18% 9% 1	2507
	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	33% 24% 29% 10% 3 1	490
April	1st to 10th	Day	40% 25% 23% 9% 2	420
	11th to 20th	Day	29% 28% 31% 9% 2	412
	21st to end	Day	30% 21% 29% 14% 5% 1	420
May	1st to 10th	Day	36% 18% 29% 12% 3 1	517
	11th to 20th	Day	27% 17% 33% 18% 4 1	624
	21st to end	Day	33% 14% 33% 17% 3 1	680
June	1st to 10th	Day	33% 15% 28% 18% 6%	630
	11th to 20th	Day	28% 15% 30% 21% 5% 1	630
	21st to end	Day	35% 9% 30% 19% 5% 1	630
July	1st to 10th	Day	23% 13% 32% 23% 8%	620
	11th to 20th	Day	24% 11% 32% 23% 9% 1	618
	21st to end	Day	30% 9% 30% 23% 6% 1	656
August	1st to 10th	Day	19% 10% 38% 24% 7% 2	446
	11th to 20th	Day	24% 9% 33% 20% 12% 2	439
	21st to end	Day	20% 15% 28% 26% 9% 2	495
September	1st to 10th	Day	20% 13% 33% 25% 8% 1	450
	11th to 20th	Day	27% 18% 26% 19% 9% 2	450
	21st to end	Day	22% 16% 29% 22% 9% 2	405
October	1st to 10th	Day	24% 11% 33% 20% 9% 2	360
	11th to 20th	Day	25% 19% 29% 17% 8% 2	360
	21st to end	Day	30% 22% 29% 12% 6% 1	396
November	1st to 10th	Day	28% 18% 29% 16% 7% 2	365
	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	29% 18% 30% 18% 4	799
April	1st to 10th	Night	35% 16% 29% 17% 4	540
	11th to 20th	Night	30% 15% 35% 16% 4	534
	21st to end	Night	31% 14% 31% 19% 4 1	540
May	1st to 10th	Night	33% 13% 31% 17% 5% 1	540
	11th to 20th	Night	28% 12% 29% 24% 6% 1	532
	21st to end	Night	24% 14% 36% 22% 3	583
June	1st to 10th	Night	37% 9% 29% 22% 3	540
	11th to 20th	Night	29% 9% 32% 24% 5%	540
	21st to end	Night	31% 8% 29% 24% 7%	540
July	1st to 10th	Night	23% 7% 28% 34% 7%	526
	11th to 20th	Night	25% 8% 29% 32% 7%	522
	21st to end	Night	23% 9% 28% 30% 10%	590
August	1st to 10th	Night	19% 6% 29% 33% 13% 1	538
	11th to 20th	Night	23% 8% 25% 32% 12%	532
	21st to end	Night	21% 8% 23% 34% 14% 1	594
September	1st to 10th	Night	21% 6% 32% 29% 11%	540
	11th to 20th	Night	24% 13% 25% 27% 11% 1	558
	21st to end	Night	26% 11% 29% 24% 8% 2	720
October	1st to 10th	Night	24% 9% 28% 29% 9% 1	720
	11th to 20th	Night	24% 14% 31% 22% 10% 1	720
	21st to end	Night	33% 16% 29% 18% 4	802
November	1st to 10th	Night	29% 14% 30% 21% 5% 1	830
	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 2024-03-25 00:36:59. Version ac07

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