Tatamagouche
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Tatamagouche clear sky chart from 2005-11-06 to 2026-04-02.

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	16% 12% 4 9% 5% 4 5% 4 5% 7% 29%	132476
	Night	16% 13% 4 10% 5% 5% 4 4 5% 6% 29%	129511
Transparency	Day	53% 8% 12% 18% 8% 1	136018
	Night	55% 8% 12% 17% 8% 1	134060
Seeing	Day	26% 21% 31% 16% 4 1	19342
	Night	25% 20% 31% 19% 4	26703

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	11% 21% 8% 16% 8% 4 4 3 4 6% 16%	4690
	11th to 20th	Day	12% 18% 10% 13% 7% 5% 4 3 4 4 19%	4681
	21st to end	Day	9% 11% 5% 13% 6% 4 4 3 5% 6% 34%	5724
February	1st to 10th	Day	14% 16% 5% 12% 6% 5% 4 3 4 6% 26%	1890
	11th to 20th	Day	16% 15% 5% 12% 6% 4 4 4 4 4 26%	1843
	21st to end	Day	9% 16% 5% 9% 6% 6% 4 3 5% 7% 29%	1606
March	1st to 10th	Day	16% 14% 4 13% 6% 6% 5% 3 5% 5% 23%	4903
	11th to 20th	Day	10% 17% 7% 12% 5% 5% 5% 4 6% 6% 24%	5090
	21st to end	Day	18% 19% 6% 12% 5% 4 4 3 4 4 19%	5651
April	1st to 10th	Day	20% 16% 4 9% 5% 4 4 3 4 5% 26%	2412
	11th to 20th	Day	19% 13% 3 7% 5% 4 3 4 5% 7% 30%	2423
	21st to end	Day	19% 15% 4 7% 4 5% 4 3 6% 6% 28%	2600
May	1st to 10th	Day	28% 14% 3 6% 4 3 4 4 5% 6% 22%	6197
	11th to 20th	Day	21% 10% 3 7% 5% 4 4 3 5% 7% 31%	6318
	21st to end	Day	17% 9% 3 7% 5% 4 5% 4 6% 9% 30%	6948
June	1st to 10th	Day	26% 8% 3 6% 5% 5% 5% 4 6% 6% 25%	2800
	11th to 20th	Day	20% 8% 3 7% 5% 4 5% 4 5% 7% 34%	2927
	21st to end	Day	23% 9% 3 8% 5% 4 4 3 6% 6% 28%	3000
July	1st to 10th	Day	17% 8% 3 7% 5% 5% 6% 5% 7% 9% 29%	6682
	11th to 20th	Day	12% 6% 2 6% 5% 4 5% 4 7% 9% 41%	6360
	21st to end	Day	12% 6% 2 6% 4 5% 5% 5% 7% 10% 38%	6927
August	1st to 10th	Day	15% 8% 3 8% 5% 5% 7% 5% 6% 8% 30%	4240
	11th to 20th	Day	14% 6% 3 6% 4 5% 5% 5% 6% 9% 38%	4175
	21st to end	Day	11% 5% 2 6% 4 5% 5% 4 6% 8% 45%	4458
September	1st to 10th	Day	17% 5% 2 6% 4 4 4 3 7% 8% 41%	2400
	11th to 20th	Day	17% 7% 2 7% 4 4 4 4 6% 7% 38%	2373
	21st to end	Day	17% 7% 3 6% 4 5% 4 3 6% 7% 39%	2105
October	1st to 10th	Day	19% 7% 3 7% 4 4 5% 3 6% 7% 35%	2000
	11th to 20th	Day	19% 10% 3 7% 5% 4 5% 5% 5% 7% 30%	2000
	21st to end	Day	19% 12% 4 8% 6% 4 5% 4 5% 6% 28%	2157
November	1st to 10th	Day	21% 15% 3 6% 4 5% 5% 4 5% 6% 26%	1700
	11th to 20th	Day	17% 19% 5% 9% 5% 4 4 4 6% 7% 21%	1680
	21st to end	Day	16% 17% 5% 9% 6% 4 4 3 6% 7% 24%	1680
December	1st to 10th	Day	12% 15% 6% 11% 6% 5% 4 3 5% 6% 28%	2690
	11th to 20th	Day	17% 14% 4 10% 6% 5% 5% 3 4 3 27%	3076
	21st to end	Day	16% 12% 11% 13% 5% 4 4 4 5% 6% 19%	4070
January	1st to 10th	Night	13% 19% 5% 12% 6% 5% 5% 4 6% 5% 20%	8234
	11th to 20th	Night	14% 17% 7% 13% 5% 5% 5% 3 4 5% 22%	8234
	21st to end	Night	8% 11% 5% 13% 7% 5% 4 4 5% 5% 33%	8442
February	1st to 10th	Night	17% 13% 5% 13% 7% 5% 4 3 4 5% 25%	2730
	11th to 20th	Night	15% 15% 4 12% 7% 5% 4 3 5% 6% 24%	2663
	21st to end	Night	9% 17% 5% 10% 6% 4 4 4 5% 5% 29%	2199
March	1st to 10th	Night	18% 13% 5% 13% 8% 5% 5% 3 4 4 22%	5142
	11th to 20th	Night	14% 16% 5% 9% 6% 5% 4 3 5% 6% 27%	5089
	21st to end	Night	19% 17% 6% 12% 6% 5% 4 2 4 4 22%	5509
April	1st to 10th	Night	20% 15% 5% 7% 5% 4 4 3 6% 5% 26%	2011
	11th to 20th	Night	20% 13% 2 6% 5% 3 3 3 5% 5% 33%	1923
	21st to end	Night	21% 14% 3 8% 5% 3 4 3 5% 5% 27%	1800
May	1st to 10th	Night	27% 17% 3 6% 5% 4 4 3 5% 6% 18%	3756
	11th to 20th	Night	18% 11% 3 7% 5% 4 5% 4 6% 6% 30%	3596
	21st to end	Night	16% 10% 3 8% 5% 5% 5% 5% 6% 7% 30%	3948
June	1st to 10th	Night	24% 9% 3 7% 4 4 4 4 5% 9% 28%	1600
	11th to 20th	Night	18% 7% 3 6% 5% 3 3 3 6% 7% 39%	1486
	21st to end	Night	21% 8% 2 6% 4 5% 5% 4 7% 7% 31%	1400
July	1st to 10th	Night	12% 7% 3 9% 6% 7% 6% 5% 8% 10% 27%	3247
	11th to 20th	Night	10% 7% 2 6% 4 5% 5% 4 7% 9% 41%	3620
	21st to end	Night	14% 6% 3 6% 5% 4 5% 5% 7% 9% 38%	3948
August	1st to 10th	Night	14% 9% 2 8% 5% 5% 6% 4 7% 8% 33%	2905
	11th to 20th	Night	10% 6% 2 7% 5% 5% 5% 5% 7% 9% 39%	2872
	21st to end	Night	13% 5% 2 6% 4 3 4 4 6% 8% 45%	3439
September	1st to 10th	Night	13% 6% 2 6% 4 4 4 4 6% 9% 44%	2000
	11th to 20th	Night	17% 7% 2 5% 4 3 4 3 5% 7% 43%	2024
	21st to end	Night	18% 7% 2 6% 4 4 5% 4 5% 7% 38%	2295
October	1st to 10th	Night	20% 6% 2 6% 4 4 4 4 6% 7% 39%	2400
	11th to 20th	Night	18% 9% 2 7% 5% 4 5% 3 6% 8% 33%	2400
	21st to end	Night	24% 10% 3 8% 5% 4 5% 3 4 6% 27%	2681
November	1st to 10th	Night	18% 16% 4 8% 5% 5% 4 3 4 5% 28%	2815
	11th to 20th	Night	19% 16% 4 7% 5% 5% 6% 4 6% 5% 23%	2940
	21st to end	Night	20% 18% 4 7% 5% 4 4 3 6% 5% 23%	2940
December	1st to 10th	Night	13% 13% 4 9% 5% 5% 5% 4 4 6% 33%	4720
	11th to 20th	Night	15% 14% 5% 12% 6% 5% 4 3 4 5% 26%	5353
	21st to end	Night	20% 13% 6% 16% 5% 4 4 3 4 5% 20%	7150

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	69% 8% 12% 7% 4	4691
	11th to 20th	Day	68% 8% 9% 10% 5%	4710
	21st to end	Day	52% 6% 8% 16% 15% 3	5724
February	1st to 10th	Day	62% 6% 10% 13% 8% 1	1890
	11th to 20th	Day	62% 6% 10% 16% 6% 1	1851
	21st to end	Day	53% 8% 12% 16% 9% 2	1606
March	1st to 10th	Day	61% 7% 9% 15% 7% 1	4907
	11th to 20th	Day	58% 8% 14% 14% 4 1	5090
	21st to end	Day	67% 7% 6% 13% 6% 1	5651
April	1st to 10th	Day	61% 6% 8% 12% 10% 3	2412
	11th to 20th	Day	54% 8% 9% 17% 11% 1	2423
	21st to end	Day	57% 7% 11% 14% 10% 1	2600
May	1st to 10th	Day	61% 7% 11% 14% 6%	6209
	11th to 20th	Day	53% 9% 12% 21% 5%	6322
	21st to end	Day	47% 12% 14% 19% 8%	6948
June	1st to 10th	Day	58% 9% 11% 17% 5%	2800
	11th to 20th	Day	48% 8% 13% 21% 9% 1	2927
	21st to end	Day	56% 8% 11% 15% 9% 1	3000
July	1st to 10th	Day	50% 8% 15% 18% 9%	6610
	11th to 20th	Day	39% 8% 16% 27% 9%	6284
	21st to end	Day	40% 10% 19% 25% 5%	6730
August	1st to 10th	Day	51% 9% 13% 21% 6%	4226
	11th to 20th	Day	42% 8% 14% 25% 10%	4214
	21st to end	Day	37% 8% 14% 28% 13% 1	4458
September	1st to 10th	Day	40% 9% 14% 26% 11% 1	2400
	11th to 20th	Day	46% 7% 14% 22% 11% 1	2373
	21st to end	Day	45% 8% 11% 25% 12%	2105
October	1st to 10th	Day	48% 10% 14% 21% 8%	3260
	11th to 20th	Day	48% 8% 13% 23% 8%	3240
	21st to end	Day	47% 7% 17% 20% 10%	3462
November	1st to 10th	Day	59% 9% 10% 17% 6%	1700
	11th to 20th	Day	62% 6% 15% 13% 4	1680
	21st to end	Day	61% 8% 16% 11% 4	1680
December	1st to 10th	Day	59% 7% 10% 20% 4	2690
	11th to 20th	Day	63% 5% 12% 9% 10% 1	3075
	21st to end	Day	66% 8% 12% 10% 3	4070
January	1st to 10th	Night	62% 8% 13% 13% 4	8234
	11th to 20th	Night	65% 8% 9% 12% 6%	8280
	21st to end	Night	52% 6% 9% 16% 14% 2	8442
February	1st to 10th	Night	62% 6% 9% 12% 9% 2	2730
	11th to 20th	Night	61% 7% 10% 13% 7% 1	2666
	21st to end	Night	55% 8% 10% 17% 9% 1	2199
March	1st to 10th	Night	65% 7% 6% 11% 9% 1	5151
	11th to 20th	Night	57% 7% 12% 15% 7% 1	5090
	21st to end	Night	66% 6% 6% 13% 8% 1	5509
April	1st to 10th	Night	59% 8% 9% 12% 9% 2	2011
	11th to 20th	Night	53% 6% 9% 20% 11% 1	1923
	21st to end	Night	57% 8% 9% 13% 12% 1	1800
May	1st to 10th	Night	63% 9% 10% 12% 6%	3761
	11th to 20th	Night	51% 10% 13% 19% 7% 1	3597
	21st to end	Night	49% 13% 16% 17% 5%	3949
June	1st to 10th	Night	54% 10% 11% 18% 7%	1600
	11th to 20th	Night	44% 7% 13% 24% 12%	1486
	21st to end	Night	52% 11% 13% 15% 8% 1	1400
July	1st to 10th	Night	50% 10% 15% 19% 5% 1	3211
	11th to 20th	Night	38% 9% 20% 22% 11% 1	3572
	21st to end	Night	42% 9% 17% 24% 8%	3831
August	1st to 10th	Night	49% 9% 16% 21% 5%	2894
	11th to 20th	Night	40% 11% 17% 25% 7%	2899
	21st to end	Night	36% 8% 20% 24% 11% 1	3438
September	1st to 10th	Night	37% 10% 13% 28% 12%	2000
	11th to 20th	Night	42% 8% 13% 24% 12% 1	2024
	21st to end	Night	44% 9% 11% 25% 10%	2295
October	1st to 10th	Night	49% 7% 15% 20% 9%	3920
	11th to 20th	Night	41% 8% 15% 24% 12%	3899
	21st to end	Night	52% 7% 13% 18% 9% 1	4329
November	1st to 10th	Night	60% 7% 12% 15% 6%	2815
	11th to 20th	Night	61% 9% 13% 13% 5%	2940
	21st to end	Night	62% 8% 15% 11% 2	2940
December	1st to 10th	Night	52% 7% 13% 21% 7%	4720
	11th to 20th	Night	61% 8% 10% 12% 7% 2	5355
	21st to end	Night	67% 6% 12% 11% 4	7150

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	28% 28% 30% 12% 1	430
	11th to 20th	Day	29% 26% 29% 12% 3	430
	21st to end	Day	21% 29% 36% 13% 2	473
February	1st to 10th	Day	28% 27% 30% 12% 2	430
	11th to 20th	Day	30% 29% 29% 10% 2	426
	21st to end	Day	25% 26% 33% 14% 2 1	355
March	1st to 10th	Day	27% 28% 32% 11% 1	507
	11th to 20th	Day	25% 29% 30% 12% 3	540
	21st to end	Day	33% 30% 26% 9% 2	594
April	1st to 10th	Day	35% 31% 25% 7% 2	504
	11th to 20th	Day	31% 28% 26% 12% 3	492
	21st to end	Day	27% 24% 31% 15% 3	500
May	1st to 10th	Day	34% 22% 29% 10% 4 1	633
	11th to 20th	Day	25% 21% 28% 20% 6% 1	724
	21st to end	Day	25% 19% 37% 15% 3	790
June	1st to 10th	Day	33% 15% 31% 17% 4	730
	11th to 20th	Day	25% 16% 36% 19% 4 1	730
	21st to end	Day	28% 15% 33% 17% 7% 1	730
July	1st to 10th	Day	20% 12% 39% 22% 6% 1	720
	11th to 20th	Day	15% 12% 39% 26% 8%	718
	21st to end	Day	20% 11% 35% 27% 6%	795
August	1st to 10th	Day	14% 11% 38% 30% 8% 1	531
	11th to 20th	Day	19% 12% 32% 25% 10% 2	519
	21st to end	Day	16% 15% 31% 28% 8% 2	583
September	1st to 10th	Day	16% 18% 38% 21% 6% 1	530
	11th to 20th	Day	22% 17% 31% 21% 8% 1	530
	21st to end	Day	21% 18% 33% 18% 9% 1	478
October	1st to 10th	Day	22% 15% 33% 19% 9% 1	420
	11th to 20th	Day	25% 24% 27% 17% 6% 1	420
	21st to end	Day	28% 28% 27% 12% 4 1	462
November	1st to 10th	Day	32% 27% 25% 13% 3 1	425
	11th to 20th	Day	36% 25% 26% 9% 3 1	430
	21st to end	Day	31% 31% 26% 9% 3	430
December	1st to 10th	Day	35% 24% 30% 10% 1	430
	11th to 20th	Day	35% 31% 27% 7%	430
	21st to end	Day	25% 33% 29% 12% 2	473
January	1st to 10th	Night	27% 26% 32% 13% 2	950
	11th to 20th	Night	26% 26% 29% 15% 3	950
	21st to end	Night	21% 28% 32% 16% 3 1	932
February	1st to 10th	Night	28% 22% 31% 16% 3	840
	11th to 20th	Night	29% 28% 27% 14% 2	823
	21st to end	Night	21% 22% 34% 18% 5%	692
March	1st to 10th	Night	26% 25% 31% 17% 2	840
	11th to 20th	Night	23% 24% 28% 20% 5%	840
	21st to end	Night	26% 25% 27% 18% 4 1	897
April	1st to 10th	Night	30% 23% 29% 15% 3	604
	11th to 20th	Night	27% 19% 32% 17% 5%	594
	21st to end	Night	27% 20% 27% 21% 5% 1	600
May	1st to 10th	Night	31% 18% 27% 18% 5% 1	600
	11th to 20th	Night	26% 14% 31% 23% 5% 1	592
	21st to end	Night	19% 17% 42% 18% 4	649
June	1st to 10th	Night	29% 13% 34% 21% 4	600
	11th to 20th	Night	21% 13% 39% 22% 5%	486
	21st to end	Night	24% 10% 32% 29% 5% 1	400
July	1st to 10th	Night	17% 9% 40% 29% 5%	424
	11th to 20th	Night	13% 10% 38% 33% 5%	582
	21st to end	Night	17% 9% 34% 34% 6%	656
August	1st to 10th	Night	16% 7% 35% 33% 8% 1	598
	11th to 20th	Night	17% 11% 34% 29% 8% 1	592
	21st to end	Night	16% 10% 31% 34% 9%	660
September	1st to 10th	Night	15% 11% 40% 27% 7% 1	600
	11th to 20th	Night	21% 12% 30% 28% 8%	624
	21st to end	Night	22% 15% 32% 24% 6% 1	800
October	1st to 10th	Night	23% 14% 29% 28% 7%	800
	11th to 20th	Night	24% 18% 33% 17% 6% 1	800
	21st to end	Night	33% 23% 27% 14% 3	903
November	1st to 10th	Night	32% 24% 28% 12% 4	930
	11th to 20th	Night	30% 26% 25% 15% 3	950
	21st to end	Night	32% 24% 28% 14% 2	950
December	1st to 10th	Night	32% 21% 32% 12% 2	950
	11th to 20th	Night	31% 30% 28% 9% 2	950
	21st to end	Night	31% 26% 28% 13% 2	1045

Page generated at 2026-03-30 03:18:46. Version ac07

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