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 2024-12-09.

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% 12% 4 9% 5% 4 5% 4 5% 7% 29%	102425
	Night	17% 12% 4 9% 5% 5% 4 4 5% 6% 28%	97435
Transparency	Day	53% 9% 13% 17% 7% 1	105985
	Night	55% 8% 13% 16% 7% 1	101968
Seeing	Day	25% 21% 32% 17% 5% 1	17581
	Night	25% 20% 31% 20% 4	24862

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	13% 15% 7% 18% 9% 3 4 2 4 5% 18%	2526
	11th to 20th	Day	10% 15% 7% 11% 6% 5% 5% 3 5% 5% 27%	2530
	21st to end	Day	13% 13% 6% 16% 6% 4 3 3 4 6% 26%	3093
February	1st to 10th	Day	15% 15% 4 12% 6% 5% 4 3 4 6% 26%	1710
	11th to 20th	Day	16% 15% 5% 11% 7% 4 4 4 4 4 25%	1663
	21st to end	Day	9% 16% 5% 9% 6% 6% 4 3 5% 8% 29%	1457
March	1st to 10th	Day	20% 16% 4 8% 5% 5% 4 3 4 5% 26%	3338
	11th to 20th	Day	9% 21% 8% 13% 6% 5% 4 4 5% 4 22%	3480
	21st to end	Day	20% 19% 6% 12% 5% 4 4 3 4 4 19%	3865
April	1st to 10th	Day	19% 17% 4 9% 5% 4 4 3 4 6% 26%	2280
	11th to 20th	Day	19% 13% 3 7% 5% 4 3 4 5% 7% 30%	2300
	21st to end	Day	20% 14% 4 7% 4 5% 4 3 6% 6% 28%	2470
May	1st to 10th	Day	28% 16% 3 7% 4 3 4 3 5% 5% 22%	4319
	11th to 20th	Day	19% 10% 2 6% 5% 4 4 4 5% 7% 34%	4398
	21st to end	Day	15% 9% 3 8% 5% 5% 5% 5% 7% 9% 29%	4836
June	1st to 10th	Day	27% 8% 3 7% 5% 5% 5% 4 6% 6% 24%	2660
	11th to 20th	Day	21% 8% 2 7% 5% 4 4 4 5% 6% 34%	2780
	21st to end	Day	23% 9% 3 8% 5% 4 4 3 6% 6% 28%	2850
July	1st to 10th	Day	17% 8% 2 6% 4 5% 5% 5% 6% 8% 33%	4664
	11th to 20th	Day	12% 6% 3 7% 5% 5% 5% 4 8% 10% 36%	4440
	21st to end	Day	13% 7% 2 7% 5% 5% 5% 4 6% 10% 37%	4815
August	1st to 10th	Day	15% 8% 3 8% 5% 5% 7% 5% 6% 8% 28%	4110
	11th to 20th	Day	14% 6% 3 6% 4 5% 5% 5% 6% 8% 37%	4045
	21st to end	Day	12% 5% 2 6% 5% 5% 5% 4 6% 8% 45%	4322
September	1st to 10th	Day	17% 5% 2 6% 4 4 4 3 7% 8% 40%	2280
	11th to 20th	Day	17% 7% 2 7% 4 4 4 4 6% 7% 38%	2255
	21st to end	Day	18% 7% 3 6% 4 4 4 3 6% 7% 38%	2000
October	1st to 10th	Day	19% 7% 3 7% 4 4 5% 3 7% 7% 34%	1900
	11th to 20th	Day	18% 10% 3 7% 5% 4 5% 5% 5% 7% 30%	1900
	21st to end	Day	18% 12% 4 8% 6% 3 5% 4 5% 7% 28%	2049
November	1st to 10th	Day	20% 15% 3 6% 4 5% 5% 4 5% 6% 26%	1617
	11th to 20th	Day	17% 19% 5% 9% 5% 4 4 4 6% 7% 21%	1600
	21st to end	Day	16% 17% 5% 9% 6% 4 4 3 6% 7% 23%	1600
December	1st to 10th	Day	19% 17% 6% 10% 6% 5% 4 3 5% 6% 19%	1584
	11th to 20th	Day	19% 18% 5% 12% 7% 5% 5% 4 5% 3 17%	1906
	21st to end	Day	19% 15% 10% 12% 5% 4 3 3 4 5% 20%	2783
January	1st to 10th	Night	12% 14% 6% 15% 7% 5% 5% 3 6% 5% 22%	4429
	11th to 20th	Night	12% 12% 6% 12% 6% 5% 5% 3 5% 6% 27%	4440
	21st to end	Night	13% 14% 5% 15% 7% 4 3 4 4 5% 26%	4560
February	1st to 10th	Night	18% 13% 5% 11% 7% 5% 4 3 4 5% 26%	2470
	11th to 20th	Night	16% 15% 5% 11% 7% 5% 4 3 5% 6% 23%	2403
	21st to end	Night	9% 17% 4 10% 6% 4 4 4 5% 6% 30%	1996
March	1st to 10th	Night	21% 14% 5% 12% 6% 5% 4 3 4 4 22%	3487
	11th to 20th	Night	16% 20% 6% 9% 6% 5% 4 3 5% 4 21%	3479
	21st to end	Night	19% 16% 6% 12% 6% 5% 4 2 4 4 22%	3767
April	1st to 10th	Night	20% 15% 5% 7% 5% 4 4 3 6% 5% 26%	1900
	11th to 20th	Night	19% 13% 3 6% 5% 3 3 4 5% 5% 33%	1826
	21st to end	Night	21% 14% 3 8% 5% 3 4 3 5% 5% 28%	1710
May	1st to 10th	Night	26% 18% 3 6% 5% 5% 4 3 4 5% 20%	2627
	11th to 20th	Night	17% 10% 3 7% 5% 5% 5% 4 6% 7% 33%	2506
	21st to end	Night	15% 10% 3 8% 6% 6% 5% 5% 6% 8% 27%	2749
June	1st to 10th	Night	24% 9% 3 8% 4 4 3 4 5% 9% 27%	1520
	11th to 20th	Night	19% 7% 3 6% 5% 3 3 4 6% 7% 38%	1412
	21st to end	Night	21% 8% 2 6% 4 5% 5% 5% 7% 7% 31%	1330
July	1st to 10th	Night	13% 7% 3 8% 6% 5% 5% 4 8% 9% 30%	2269
	11th to 20th	Night	12% 6% 2 6% 4 6% 5% 5% 7% 10% 36%	2530
	21st to end	Night	11% 6% 3 6% 4 4 5% 4 6% 8% 42%	2750
August	1st to 10th	Night	14% 9% 2 8% 5% 5% 6% 4 7% 8% 32%	2815
	11th to 20th	Night	10% 6% 2 7% 5% 5% 5% 5% 7% 10% 38%	2782
	21st to end	Night	13% 5% 2 6% 4 3 4 4 6% 7% 45%	3334
September	1st to 10th	Night	13% 6% 2 6% 4 4 4 4 6% 9% 42%	1900
	11th to 20th	Night	17% 7% 2 5% 4 3 3 3 5% 7% 43%	1923
	21st to end	Night	18% 7% 2 6% 4 4 5% 4 5% 7% 38%	2180
October	1st to 10th	Night	20% 6% 2 6% 4 4 4 4 6% 8% 38%	2280
	11th to 20th	Night	17% 9% 2 7% 5% 4 5% 3 6% 8% 34%	2280
	21st to end	Night	25% 10% 3 8% 5% 4 5% 3 4 7% 27%	2547
November	1st to 10th	Night	19% 16% 3 8% 5% 5% 4 3 4 5% 28%	2678
	11th to 20th	Night	19% 16% 4 7% 5% 5% 6% 4 6% 5% 22%	2800
	21st to end	Night	21% 19% 4 7% 5% 4 4 3 6% 5% 22%	2800
December	1st to 10th	Night	19% 18% 4 9% 4 5% 4 4 4 6% 21%	2779
	11th to 20th	Night	19% 18% 6% 12% 6% 4 3 3 4 5% 20%	3293
	21st to end	Night	25% 15% 5% 12% 4 3 3 3 4 5% 21%	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	66% 11% 13% 6% 3	2527
	11th to 20th	Day	58% 10% 9% 15% 8%	2530
	21st to end	Day	60% 7% 10% 12% 10% 1	3093
February	1st to 10th	Day	61% 6% 10% 14% 8% 1	1710
	11th to 20th	Day	62% 6% 11% 14% 6% 1	1671
	21st to end	Day	53% 7% 12% 16% 9% 2	1457
March	1st to 10th	Day	59% 6% 10% 17% 7% 1	3342
	11th to 20th	Day	64% 8% 9% 12% 5% 1	3480
	21st to end	Day	69% 7% 7% 11% 5% 1	3865
April	1st to 10th	Day	60% 6% 9% 13% 9% 3	2280
	11th to 20th	Day	53% 8% 9% 17% 12% 1	2300
	21st to end	Day	56% 7% 11% 14% 10% 1	2470
May	1st to 10th	Day	62% 8% 11% 13% 5% 1	4334
	11th to 20th	Day	48% 11% 14% 20% 7%	4402
	21st to end	Day	47% 14% 15% 16% 7%	4836
June	1st to 10th	Day	59% 9% 11% 16% 5%	2660
	11th to 20th	Day	49% 8% 13% 21% 9% 1	2780
	21st to end	Day	56% 9% 11% 14% 9% 1	2850
July	1st to 10th	Day	47% 9% 15% 18% 11%	4592
	11th to 20th	Day	42% 10% 18% 23% 7%	4364
	21st to end	Day	42% 11% 18% 23% 6%	4662
August	1st to 10th	Day	52% 10% 13% 20% 5%	4096
	11th to 20th	Day	43% 9% 14% 25% 10%	4084
	21st to end	Day	37% 8% 14% 27% 13% 1	4322
September	1st to 10th	Day	41% 9% 15% 24% 11%	2280
	11th to 20th	Day	46% 7% 14% 22% 11% 1	2255
	21st to end	Day	45% 8% 11% 25% 11%	2000
October	1st to 10th	Day	48% 10% 14% 21% 8%	3160
	11th to 20th	Day	48% 7% 14% 23% 8%	3140
	21st to end	Day	47% 7% 17% 20% 10%	3354
November	1st to 10th	Day	58% 9% 10% 17% 5%	1617
	11th to 20th	Day	62% 7% 15% 12% 4	1600
	21st to end	Day	62% 8% 16% 11% 3	1600
December	1st to 10th	Day	67% 8% 11% 11% 3	1584
	11th to 20th	Day	72% 5% 12% 8% 3 1	1905
	21st to end	Day	68% 8% 12% 8% 3 1	2783
January	1st to 10th	Night	57% 11% 19% 11% 2	4429
	11th to 20th	Night	57% 10% 10% 15% 7%	4440
	21st to end	Night	60% 7% 11% 16% 5%	4560
February	1st to 10th	Night	61% 6% 9% 12% 9% 2	2470
	11th to 20th	Night	62% 7% 10% 12% 8% 1	2406
	21st to end	Night	54% 8% 10% 17% 9% 1	1996
March	1st to 10th	Night	64% 7% 7% 13% 7% 2	3496
	11th to 20th	Night	65% 8% 9% 13% 5% 1	3480
	21st to end	Night	68% 6% 7% 12% 6% 1	3767
April	1st to 10th	Night	59% 8% 9% 13% 9% 2	1900
	11th to 20th	Night	52% 6% 9% 20% 11% 1	1826
	21st to end	Night	56% 8% 9% 12% 13% 1	1710
May	1st to 10th	Night	64% 9% 10% 12% 5%	2632
	11th to 20th	Night	46% 11% 16% 19% 7% 1	2507
	21st to end	Night	51% 16% 15% 13% 4	2750
June	1st to 10th	Night	55% 10% 11% 18% 6%	1520
	11th to 20th	Night	45% 7% 13% 23% 11%	1412
	21st to end	Night	52% 12% 13% 15% 8% 1	1330
July	1st to 10th	Night	48% 10% 16% 17% 6% 2	2233
	11th to 20th	Night	41% 11% 22% 17% 9%	2482
	21st to end	Night	39% 10% 17% 24% 10%	2663
August	1st to 10th	Night	50% 9% 16% 20% 4	2804
	11th to 20th	Night	41% 11% 17% 25% 6%	2809
	21st to end	Night	37% 8% 20% 24% 11% 1	3333
September	1st to 10th	Night	37% 10% 14% 27% 11%	1900
	11th to 20th	Night	42% 8% 13% 24% 12% 1	1923
	21st to end	Night	44% 9% 12% 24% 10%	2180
October	1st to 10th	Night	50% 7% 15% 20% 9%	3800
	11th to 20th	Night	40% 8% 16% 24% 12%	3779
	21st to end	Night	52% 7% 13% 18% 10% 1	4195
November	1st to 10th	Night	59% 8% 12% 15% 6%	2678
	11th to 20th	Night	60% 9% 13% 12% 5%	2800
	21st to end	Night	63% 9% 16% 11% 2	2800
December	1st to 10th	Night	64% 8% 14% 11% 3	2779
	11th to 20th	Night	70% 5% 12% 9% 3	3295
	21st to end	Night	68% 7% 14% 9% 2 1	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	26% 28% 32% 13% 1	370
	11th to 20th	Day	28% 26% 30% 12% 3	370
	21st to end	Day	19% 28% 37% 14% 2	407
February	1st to 10th	Day	28% 29% 27% 12% 3 1	370
	11th to 20th	Day	31% 29% 29% 10% 2	366
	21st to end	Day	21% 26% 33% 16% 2 1	307
March	1st to 10th	Day	25% 27% 33% 13% 1	433
	11th to 20th	Day	23% 28% 31% 14% 4	460
	21st to end	Day	32% 28% 27% 10% 2	506
April	1st to 10th	Day	32% 31% 27% 8% 2	460
	11th to 20th	Day	29% 29% 27% 13% 2	452
	21st to end	Day	26% 23% 32% 16% 3	460
May	1st to 10th	Day	34% 22% 29% 10% 5% 1	586
	11th to 20th	Day	24% 20% 28% 21% 6% 1	674
	21st to end	Day	26% 19% 37% 16% 3	735
June	1st to 10th	Day	33% 15% 31% 16% 4	680
	11th to 20th	Day	25% 15% 36% 19% 4 1	680
	21st to end	Day	26% 15% 33% 18% 8% 1	680
July	1st to 10th	Day	19% 11% 39% 23% 6% 1	670
	11th to 20th	Day	15% 11% 39% 26% 9%	668
	21st to end	Day	21% 10% 35% 28% 7%	740
August	1st to 10th	Day	14% 10% 37% 30% 8% 1	491
	11th to 20th	Day	20% 12% 31% 25% 9% 1	479
	21st to end	Day	16% 14% 31% 29% 9% 2	539
September	1st to 10th	Day	17% 18% 37% 21% 6% 1	490
	11th to 20th	Day	22% 16% 31% 22% 8% 1	490
	21st to end	Day	21% 18% 33% 19% 9% 1	443
October	1st to 10th	Day	22% 15% 33% 19% 9% 2	390
	11th to 20th	Day	25% 24% 27% 17% 6% 1	390
	21st to end	Day	27% 28% 28% 12% 4	429
November	1st to 10th	Day	28% 28% 27% 13% 3 1	395
	11th to 20th	Day	35% 26% 26% 9% 3 1	400
	21st to end	Day	32% 29% 27% 9% 2	400
December	1st to 10th	Day	34% 24% 31% 10% 1	394
	11th to 20th	Day	34% 32% 27% 8%	370
	21st to end	Day	25% 34% 27% 13% 2	407
January	1st to 10th	Night	26% 25% 33% 14% 2	850
	11th to 20th	Night	25% 27% 30% 15% 3	850
	21st to end	Night	20% 28% 32% 17% 3 1	843
February	1st to 10th	Night	28% 21% 31% 18% 2	760
	11th to 20th	Night	28% 29% 28% 13% 2	743
	21st to end	Night	20% 22% 34% 18% 5%	628
March	1st to 10th	Night	25% 24% 32% 17% 2	760
	11th to 20th	Night	22% 23% 28% 21% 5%	760
	21st to end	Night	25% 24% 27% 19% 4 1	812
April	1st to 10th	Night	28% 23% 30% 16% 3	570
	11th to 20th	Night	26% 19% 33% 17% 5%	564
	21st to end	Night	27% 20% 27% 21% 5% 1	570
May	1st to 10th	Night	31% 18% 27% 19% 6% 1	570
	11th to 20th	Night	25% 14% 30% 25% 6% 1	562
	21st to end	Night	19% 17% 42% 18% 4	616
June	1st to 10th	Night	29% 13% 34% 21% 3	570
	11th to 20th	Night	21% 13% 39% 23% 5%	462
	21st to end	Night	24% 10% 31% 29% 6% 1	380
July	1st to 10th	Night	18% 8% 40% 29% 5%	402
	11th to 20th	Night	13% 10% 38% 33% 6%	552
	21st to end	Night	17% 9% 33% 35% 6%	623
August	1st to 10th	Night	17% 7% 35% 32% 8% 1	568
	11th to 20th	Night	17% 12% 33% 29% 8% 1	562
	21st to end	Night	16% 9% 31% 34% 10%	627
September	1st to 10th	Night	15% 11% 39% 28% 7% 1	570
	11th to 20th	Night	21% 12% 31% 28% 8%	593
	21st to end	Night	22% 15% 31% 25% 6% 1	760
October	1st to 10th	Night	23% 13% 28% 28% 7%	760
	11th to 20th	Night	24% 19% 34% 17% 6% 1	760
	21st to end	Night	33% 23% 27% 14% 3	857
November	1st to 10th	Night	31% 23% 28% 13% 4	880
	11th to 20th	Night	30% 26% 25% 15% 4	900
	21st to end	Night	33% 23% 28% 14% 2	900
December	1st to 10th	Night	32% 22% 31% 13% 2	893
	11th to 20th	Night	30% 30% 28% 9% 2	850
	21st to end	Night	31% 26% 27% 12% 3	935

Page generated at 2024-12-06 04:54:49. Version ac07

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