Moncton
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Moncton 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	18% 11% 3 8% 5% 4 4 4 5% 6% 31%	101674
	Night	19% 11% 3 8% 5% 4 4 3 5% 6% 32%	97402
Transparency	Day	51% 6% 12% 20% 10% 1	105238
	Night	52% 6% 12% 20% 10% 1	101927
Seeing	Day	27% 20% 31% 16% 5% 1	16809
	Night	25% 17% 32% 20% 5%	24353

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% 12% 5% 10% 5% 4 5% 3 5% 5% 32%	2207
	11th to 20th	Day	12% 15% 5% 9% 5% 4 4 4 4 5% 33%	2387
	21st to end	Day	12% 11% 5% 11% 7% 4 3 4 5% 7% 31%	3124
February	1st to 10th	Day	16% 13% 4 9% 5% 4 4 3 5% 5% 30%	1710
	11th to 20th	Day	16% 14% 5% 9% 5% 5% 4 3 5% 5% 27%	1663
	21st to end	Day	12% 14% 4 8% 5% 4 3 4 5% 7% 34%	1430
March	1st to 10th	Day	23% 17% 5% 8% 4 4 4 3 4 5% 25%	3396
	11th to 20th	Day	16% 20% 5% 10% 5% 5% 4 3 4 5% 22%	3480
	21st to end	Day	28% 16% 4 8% 4 3 3 4 5% 5% 21%	3816
April	1st to 10th	Day	21% 15% 4 8% 6% 4 3 4 4 5% 25%	2248
	11th to 20th	Day	20% 14% 2 7% 4 5% 4 3 5% 7% 30%	2394
	21st to end	Day	23% 13% 3 7% 4 4 4 2 5% 7% 28%	2470
May	1st to 10th	Day	24% 18% 3 7% 5% 4 4 3 4 5% 24%	4202
	11th to 20th	Day	18% 9% 3 7% 5% 4 5% 3 5% 6% 34%	4398
	21st to end	Day	18% 9% 3 9% 6% 5% 6% 4 6% 7% 26%	4836
June	1st to 10th	Day	28% 9% 2 7% 4 5% 5% 4 5% 6% 26%	2809
	11th to 20th	Day	22% 7% 3 6% 5% 5% 5% 4 5% 7% 31%	2850
	21st to end	Day	27% 10% 3 7% 5% 4 5% 3 5% 6% 26%	2850
July	1st to 10th	Day	16% 7% 2 7% 5% 6% 6% 4 6% 8% 31%	4760
	11th to 20th	Day	16% 7% 2 7% 5% 5% 5% 4 7% 9% 33%	4678
	21st to end	Day	14% 7% 3 7% 6% 5% 5% 5% 7% 8% 34%	4692
August	1st to 10th	Day	19% 8% 4 7% 6% 5% 5% 4 6% 7% 30%	4105
	11th to 20th	Day	14% 6% 3 7% 5% 5% 6% 4 6% 8% 35%	4045
	21st to end	Day	13% 5% 2 6% 3 4 4 3 6% 8% 45%	4441
September	1st to 10th	Day	15% 5% 2 5% 4 4 5% 4 4 7% 43%	2280
	11th to 20th	Day	18% 7% 3 6% 4 3 3 3 5% 6% 42%	2166
	21st to end	Day	19% 7% 2 6% 4 4 4 2 4 6% 43%	2057
October	1st to 10th	Day	17% 8% 2 7% 3 3 4 3 5% 8% 39%	1900
	11th to 20th	Day	19% 9% 3 6% 4 4 5% 4 5% 6% 37%	1900
	21st to end	Day	19% 10% 4 7% 5% 5% 4 3 5% 6% 33%	2053
November	1st to 10th	Day	19% 9% 3 8% 5% 5% 4 3 4 6% 33%	1533
	11th to 20th	Day	18% 13% 4 7% 4 4 5% 2 4 7% 32%	1520
	21st to end	Day	18% 13% 4 8% 6% 3 4 3 4 6% 30%	1520
December	1st to 10th	Day	24% 14% 4 7% 4 3 4 3 4 4 29%	1520
	11th to 20th	Day	17% 20% 4 11% 4 4 3 2 3 4 27%	1803
	21st to end	Day	19% 13% 5% 12% 5% 4 3 2 4 4 28%	2431
January	1st to 10th	Night	13% 12% 4 8% 5% 4 4 3 5% 6% 36%	4748
	11th to 20th	Night	15% 14% 4 9% 6% 4 4 3 5% 6% 31%	4577
	21st to end	Night	14% 14% 4 9% 8% 4 3 3 5% 6% 31%	4532
February	1st to 10th	Night	17% 13% 4 8% 5% 4 4 4 6% 5% 30%	2470
	11th to 20th	Night	17% 14% 4 9% 5% 5% 4 3 5% 5% 29%	2403
	21st to end	Night	13% 14% 4 8% 5% 4 4 3 4 6% 34%	2022
March	1st to 10th	Night	25% 14% 4 10% 5% 5% 4 3 3 4 23%	3443
	11th to 20th	Night	20% 19% 4 8% 6% 5% 4 3 4 5% 20%	3479
	21st to end	Night	28% 12% 5% 8% 5% 4 3 4 5% 3 24%	3816
April	1st to 10th	Night	22% 15% 5% 9% 4 4 3 3 4 4 27%	1931
	11th to 20th	Night	23% 11% 2 6% 5% 4 3 2 4 5% 33%	1733
	21st to end	Night	20% 14% 3 7% 4 5% 4 3 4 5% 31%	1710
May	1st to 10th	Night	24% 16% 2 6% 5% 4 4 4 5% 5% 24%	2727
	11th to 20th	Night	18% 9% 2 5% 4 3 4 4 5% 8% 39%	2506
	21st to end	Night	17% 9% 3 9% 5% 4 5% 4 6% 8% 30%	2749
June	1st to 10th	Night	26% 8% 3 5% 4 3 4 4 6% 8% 28%	1386
	11th to 20th	Night	21% 7% 2 7% 5% 5% 4 3 4 7% 35%	1330
	21st to end	Night	25% 10% 3 6% 5% 4 5% 3 5% 6% 28%	1330
July	1st to 10th	Night	16% 7% 2 8% 5% 5% 6% 4 7% 8% 32%	2210
	11th to 20th	Night	14% 7% 3 7% 5% 5% 5% 5% 7% 7% 34%	2256
	21st to end	Night	14% 6% 2 8% 5% 5% 5% 4 6% 7% 38%	2865
August	1st to 10th	Night	17% 9% 4 9% 5% 5% 5% 4 6% 8% 28%	2825
	11th to 20th	Night	11% 7% 3 8% 5% 6% 6% 5% 6% 8% 36%	2782
	21st to end	Night	13% 4 2 5% 3 3 4 4 5% 7% 50%	3215
September	1st to 10th	Night	16% 6% 2 6% 3 4 3 3 5% 7% 45%	1900
	11th to 20th	Night	16% 7% 3 6% 3 3 4 3 3 6% 47%	2010
	21st to end	Night	17% 6% 2 6% 4 4 4 3 5% 5% 44%	2123
October	1st to 10th	Night	18% 7% 3 6% 4 3 3 4 4 6% 40%	2280
	11th to 20th	Night	18% 8% 2 6% 4 5% 4 3 4 7% 39%	2280
	21st to end	Night	23% 9% 3 8% 4 4 3 3 4 5% 34%	2541
November	1st to 10th	Night	20% 10% 3 6% 4 4 4 4 5% 5% 35%	2616
	11th to 20th	Night	18% 12% 3 6% 6% 4 4 3 5% 6% 32%	2660
	21st to end	Night	21% 11% 4 7% 5% 5% 3 3 4 6% 33%	2660
December	1st to 10th	Night	23% 12% 3 7% 5% 4 4 3 5% 4 28%	2660
	11th to 20th	Night	21% 17% 5% 8% 4 3 4 2 3 4 28%	3391
	21st to end	Night	22% 14% 5% 10% 4 3 3 2 3 4 29%	5236

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% 6% 13% 15% 11% 1	2208
	11th to 20th	Day	54% 5% 8% 19% 14% 1	2387
	21st to end	Day	52% 6% 13% 14% 15% 1	3124
February	1st to 10th	Day	56% 5% 11% 16% 11% 2	1710
	11th to 20th	Day	59% 5% 9% 15% 10% 1	1671
	21st to end	Day	50% 4 11% 21% 12% 2	1430
March	1st to 10th	Day	61% 4 11% 16% 6% 2	3400
	11th to 20th	Day	63% 6% 10% 13% 6% 2	3480
	21st to end	Day	65% 3 8% 14% 7% 2	3816
April	1st to 10th	Day	60% 5% 8% 15% 10% 2	2248
	11th to 20th	Day	53% 6% 9% 19% 11% 1	2394
	21st to end	Day	56% 5% 9% 16% 11% 3	2470
May	1st to 10th	Day	61% 6% 9% 16% 7% 1	4216
	11th to 20th	Day	46% 9% 15% 23% 7%	4402
	21st to end	Day	51% 10% 15% 16% 8%	4836
June	1st to 10th	Day	57% 6% 12% 18% 7%	2809
	11th to 20th	Day	51% 7% 12% 20% 9% 1	2850
	21st to end	Day	58% 6% 10% 16% 8% 1	2850
July	1st to 10th	Day	48% 7% 16% 18% 10% 1	4685
	11th to 20th	Day	45% 7% 16% 24% 7%	4597
	21st to end	Day	44% 9% 17% 24% 6%	4542
August	1st to 10th	Day	52% 7% 12% 23% 5%	4092
	11th to 20th	Day	44% 8% 13% 23% 12%	4084
	21st to end	Day	36% 6% 15% 26% 17%	4441
September	1st to 10th	Day	39% 6% 16% 25% 14%	2280
	11th to 20th	Day	43% 5% 12% 25% 14% 1	2166
	21st to end	Day	43% 4 10% 27% 14% 1	2057
October	1st to 10th	Day	43% 7% 12% 29% 9%	3160
	11th to 20th	Day	44% 6% 9% 32% 9% 1	3140
	21st to end	Day	43% 5% 14% 20% 18%	3367
November	1st to 10th	Day	54% 5% 10% 20% 10% 1	1533
	11th to 20th	Day	53% 5% 13% 17% 12% 1	1520
	21st to end	Day	56% 5% 14% 17% 9%	1520
December	1st to 10th	Day	58% 7% 11% 17% 7%	1520
	11th to 20th	Day	62% 5% 8% 15% 9% 1	1802
	21st to end	Day	60% 5% 13% 13% 7% 1	2431
January	1st to 10th	Night	48% 6% 14% 25% 7% 1	4748
	11th to 20th	Night	54% 6% 11% 19% 9% 1	4577
	21st to end	Night	53% 5% 10% 21% 9% 1	4532
February	1st to 10th	Night	55% 5% 12% 15% 11% 2	2470
	11th to 20th	Night	57% 5% 9% 15% 13% 1	2406
	21st to end	Night	52% 5% 10% 18% 13% 2	2022
March	1st to 10th	Night	65% 4 7% 15% 8% 2	3452
	11th to 20th	Night	65% 6% 9% 12% 7% 1	3480
	21st to end	Night	64% 4 6% 16% 9% 1	3816
April	1st to 10th	Night	60% 6% 8% 13% 11% 3	1931
	11th to 20th	Night	52% 4 11% 20% 13% 1	1733
	21st to end	Night	55% 5% 10% 15% 14% 2	1710
May	1st to 10th	Night	58% 7% 13% 14% 7% 1	2733
	11th to 20th	Night	42% 8% 17% 25% 7% 1	2507
	21st to end	Night	49% 11% 18% 15% 7%	2750
June	1st to 10th	Night	55% 6% 12% 19% 8%	1386
	11th to 20th	Night	50% 6% 11% 23% 10% 1	1330
	21st to end	Night	56% 7% 12% 15% 8% 1	1330
July	1st to 10th	Night	48% 8% 14% 20% 10%	2175
	11th to 20th	Night	46% 8% 18% 20% 8%	2214
	21st to end	Night	42% 9% 15% 23% 11%	2775
August	1st to 10th	Night	54% 9% 13% 19% 6%	2813
	11th to 20th	Night	42% 9% 16% 22% 11%	2809
	21st to end	Night	34% 6% 17% 26% 15% 1	3214
September	1st to 10th	Night	38% 7% 12% 30% 13%	1900
	11th to 20th	Night	40% 4 13% 28% 14% 1	2010
	21st to end	Night	42% 5% 11% 26% 14% 1	2123
October	1st to 10th	Night	49% 5% 11% 26% 9%	3800
	11th to 20th	Night	37% 5% 11% 33% 14%	3779
	21st to end	Night	45% 4 13% 21% 16% 1	4177
November	1st to 10th	Night	51% 6% 12% 20% 10% 1	2616
	11th to 20th	Night	53% 6% 12% 18% 10% 1	2660
	21st to end	Night	54% 5% 13% 18% 9%	2660
December	1st to 10th	Night	57% 5% 12% 18% 7%	2660
	11th to 20th	Night	61% 5% 7% 17% 10%	3393
	21st to end	Night	61% 4 11% 15% 7% 1	5236

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	31% 25% 31% 13%	180
	11th to 20th	Day	34% 27% 25% 11% 2	247
	21st to end	Day	21% 21% 39% 15% 3	407
February	1st to 10th	Day	26% 26% 29% 14% 4	370
	11th to 20th	Day	30% 29% 27% 10% 3 1	366
	21st to end	Day	23% 24% 35% 13% 4	316
March	1st to 10th	Day	29% 27% 32% 10% 1 1	460
	11th to 20th	Day	25% 25% 33% 12% 4 1	460
	21st to end	Day	34% 25% 28% 10% 3 1	506
April	1st to 10th	Day	37% 27% 26% 8% 2	460
	11th to 20th	Day	33% 26% 26% 13% 2	452
	21st to end	Day	31% 24% 27% 13% 4	460
May	1st to 10th	Day	36% 23% 24% 14% 3	520
	11th to 20th	Day	27% 19% 30% 17% 7% 1	674
	21st to end	Day	28% 20% 32% 16% 3	735
June	1st to 10th	Day	36% 15% 30% 14% 5%	680
	11th to 20th	Day	24% 18% 32% 20% 6% 1	680
	21st to end	Day	27% 17% 29% 22% 5% 1	680
July	1st to 10th	Day	23% 14% 35% 21% 6% 1	670
	11th to 20th	Day	17% 10% 38% 26% 9% 1	668
	21st to end	Day	20% 12% 38% 22% 7% 1	666
August	1st to 10th	Day	17% 12% 38% 26% 6% 1	486
	11th to 20th	Day	20% 11% 33% 24% 9% 2	479
	21st to end	Day	16% 15% 35% 24% 8% 2	539
September	1st to 10th	Day	14% 15% 42% 19% 8% 1	490
	11th to 20th	Day	23% 14% 31% 21% 9% 1	490
	21st to end	Day	21% 17% 34% 18% 7% 3	473
October	1st to 10th	Day	24% 16% 29% 18% 12% 1	390
	11th to 20th	Day	26% 20% 29% 18% 6% 1	390
	21st to end	Day	28% 24% 28% 13% 5% 1	429
November	1st to 10th	Day	28% 22% 32% 12% 6% 1	374
	11th to 20th	Day	32% 22% 29% 12% 4 1	370
	21st to end	Day	34% 24% 28% 11% 3	370
December	1st to 10th	Day	35% 21% 29% 12% 3	370
	11th to 20th	Day	39% 27% 24% 9% 1	304
	21st to end	Day	29% 30% 31% 9% 1	198
January	1st to 10th	Night	26% 24% 31% 16% 4	850
	11th to 20th	Night	27% 22% 30% 17% 4	827
	21st to end	Night	21% 22% 36% 17% 5%	836
February	1st to 10th	Night	27% 21% 33% 16% 3	760
	11th to 20th	Night	28% 25% 31% 13% 2 1	743
	21st to end	Night	21% 23% 32% 20% 3	628
March	1st to 10th	Night	27% 19% 36% 17% 1	760
	11th to 20th	Night	26% 19% 31% 18% 6%	760
	21st to end	Night	28% 17% 33% 17% 5%	836
April	1st to 10th	Night	33% 19% 28% 18% 2	601
	11th to 20th	Night	30% 17% 30% 18% 5%	564
	21st to end	Night	29% 17% 31% 16% 7%	570
May	1st to 10th	Night	31% 15% 29% 21% 4 1	570
	11th to 20th	Night	28% 15% 29% 21% 7%	562
	21st to end	Night	22% 13% 43% 18% 3	616
June	1st to 10th	Night	29% 10% 32% 25% 5%	436
	11th to 20th	Night	22% 10% 34% 28% 5%	380
	21st to end	Night	26% 8% 32% 28% 6%	380
July	1st to 10th	Night	20% 7% 40% 25% 7%	370
	11th to 20th	Night	17% 8% 37% 29% 9%	388
	21st to end	Night	17% 9% 37% 31% 6%	623
August	1st to 10th	Night	15% 6% 39% 31% 8% 1	568
	11th to 20th	Night	18% 9% 32% 29% 10% 1	562
	21st to end	Night	15% 9% 32% 32% 11% 1	627
September	1st to 10th	Night	17% 11% 38% 27% 6%	570
	11th to 20th	Night	20% 11% 27% 33% 9% 1	680
	21st to end	Night	21% 12% 32% 26% 9%	760
October	1st to 10th	Night	22% 12% 31% 26% 9%	760
	11th to 20th	Night	23% 16% 34% 20% 7%	760
	21st to end	Night	30% 20% 29% 18% 3	836
November	1st to 10th	Night	29% 19% 29% 17% 5%	835
	11th to 20th	Night	26% 20% 30% 17% 5% 1	850
	21st to end	Night	28% 23% 30% 16% 3	850
December	1st to 10th	Night	31% 19% 29% 17% 4	850
	11th to 20th	Night	32% 23% 30% 12% 2	850
	21st to end	Night	32% 23% 26% 17% 2 1	935

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

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