Oromocto
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Oromocto clear sky chart from 2005-11-06 to 2026-05-02.

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	19% 10% 3 7% 5% 4 4 4 5% 6% 33%	131536
	Night	19% 10% 3 7% 5% 4 4 3 5% 6% 33%	131093
Transparency	Day	52% 3 11% 22% 11% 1	135038
	Night	53% 3 10% 22% 11% 1	135680
Seeing	Day	27% 15% 30% 19% 7% 1	18263
	Night	26% 14% 31% 23% 6%	26253

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	12% 19% 5% 12% 5% 4 4 3 4 5% 27%	4093
	11th to 20th	Day	15% 14% 6% 13% 5% 5% 4 3 3 4 27%	4553
	21st to end	Day	8% 10% 3 8% 4 4 5% 4 6% 7% 39%	5557
February	1st to 10th	Day	14% 12% 4 7% 6% 4 5% 4 6% 5% 31%	1890
	11th to 20th	Day	15% 13% 3 8% 5% 5% 5% 4 5% 5% 31%	1843
	21st to end	Day	11% 12% 3 8% 6% 5% 4 4 5% 6% 36%	1681
March	1st to 10th	Day	25% 11% 4 11% 5% 3 4 3 4 4 27%	4828
	11th to 20th	Day	21% 12% 3 8% 5% 4 5% 3 5% 6% 27%	5090
	21st to end	Day	27% 13% 4 7% 5% 4 4 3 4 6% 23%	5587
April	1st to 10th	Day	22% 13% 3 7% 4 4 4 3 4 6% 29%	2458
	11th to 20th	Day	21% 11% 2 6% 4 3 4 3 5% 6% 34%	2702
	21st to end	Day	25% 9% 3 6% 4 4 3 3 5% 5% 33%	2730
May	1st to 10th	Day	26% 12% 3 8% 4 4 4 4 4 6% 25%	5899
	11th to 20th	Day	25% 8% 2 7% 4 4 4 3 4 6% 31%	6198
	21st to end	Day	22% 8% 3 7% 5% 5% 4 4 5% 7% 30%	7168
June	1st to 10th	Day	25% 9% 3 7% 5% 4 5% 4 4 6% 29%	3000
	11th to 20th	Day	22% 7% 2 6% 4 3 5% 3 6% 7% 34%	3000
	21st to end	Day	26% 8% 3 6% 5% 4 4 4 5% 6% 28%	3000
July	1st to 10th	Day	16% 7% 3 7% 6% 6% 6% 5% 7% 9% 29%	6820
	11th to 20th	Day	16% 6% 2 6% 4 4 4 4 6% 8% 39%	6820
	21st to end	Day	13% 7% 2 6% 4 5% 5% 4 7% 8% 39%	6609
August	1st to 10th	Day	20% 8% 3 7% 5% 4 5% 4 5% 7% 34%	4235
	11th to 20th	Day	14% 7% 3 8% 5% 6% 5% 4 6% 8% 33%	4175
	21st to end	Day	14% 5% 2 5% 4 4 5% 3 6% 8% 44%	4675
September	1st to 10th	Day	13% 5% 2 5% 4 4 4 3 6% 8% 46%	2383
	11th to 20th	Day	16% 6% 2 5% 3 4 3 3 4 5% 48%	2200
	21st to end	Day	19% 6% 2 5% 4 3 3 3 5% 6% 44%	2200
October	1st to 10th	Day	17% 7% 2 6% 4 4 4 4 5% 7% 41%	2035
	11th to 20th	Day	19% 8% 2 7% 4 4 4 3 5% 7% 37%	2000
	21st to end	Day	22% 8% 3 8% 5% 5% 4 3 4 6% 32%	2070
November	1st to 10th	Day	21% 8% 3 8% 4 4 3 3 4 6% 36%	1779
	11th to 20th	Day	21% 9% 2 6% 3 4 4 4 5% 7% 36%	1680
	21st to end	Day	21% 12% 4 8% 4 5% 3 4 4 5% 30%	1680
December	1st to 10th	Day	19% 12% 3 7% 3 3 4 3 5% 7% 34%	2657
	11th to 20th	Day	22% 10% 3 8% 5% 4 3 2 3 4 35%	2688
	21st to end	Day	19% 13% 4 7% 3 3 4 3 4 5% 34%	3553
January	1st to 10th	Night	14% 16% 5% 8% 5% 4 4 4 5% 6% 29%	8831
	11th to 20th	Night	19% 13% 4 11% 6% 5% 4 3 4 5% 25%	8318
	21st to end	Night	8% 12% 4 7% 4 5% 5% 4 6% 8% 38%	8622
February	1st to 10th	Night	15% 13% 4 7% 5% 4 4 3 6% 6% 32%	2730
	11th to 20th	Night	16% 13% 3 8% 6% 5% 4 4 5% 7% 30%	2663
	21st to end	Night	15% 14% 3 7% 5% 4 5% 4 4 5% 34%	2123
March	1st to 10th	Night	25% 14% 4 8% 5% 4 4 3 3 4 26%	5232
	11th to 20th	Night	22% 12% 3 8% 5% 5% 4 3 5% 7% 26%	5089
	21st to end	Night	31% 11% 3 6% 4 3 3 3 4 4 27%	5587
April	1st to 10th	Night	25% 12% 3 7% 4 3 4 3 5% 5% 29%	2155
	11th to 20th	Night	25% 8% 2 6% 3 3 4 3 5% 5% 34%	1868
	21st to end	Night	24% 10% 3 6% 3 4 4 3 5% 5% 32%	1890
May	1st to 10th	Night	27% 10% 3 7% 4 4 5% 3 4 5% 26%	4064
	11th to 20th	Night	24% 7% 3 6% 4 4 4 4 5% 6% 33%	3711
	21st to end	Night	19% 9% 3 6% 4 4 5% 4 5% 7% 35%	3770
June	1st to 10th	Night	25% 9% 2 7% 4 4 5% 4 5% 7% 29%	1400
	11th to 20th	Night	20% 6% 3 6% 5% 4 6% 3 5% 6% 37%	1400
	21st to end	Night	28% 6% 3 6% 5% 5% 4 4 4 7% 30%	1400
July	1st to 10th	Night	16% 7% 3 8% 5% 5% 6% 5% 6% 8% 29%	3160
	11th to 20th	Night	17% 6% 3 6% 5% 6% 5% 4 6% 8% 34%	3160
	21st to end	Night	14% 6% 2 6% 4 4 5% 5% 6% 8% 39%	4193
August	1st to 10th	Night	18% 8% 4 8% 4 5% 5% 5% 6% 7% 31%	2915
	11th to 20th	Night	13% 7% 3 9% 5% 4 5% 4 7% 8% 35%	2872
	21st to end	Night	14% 5% 2 5% 4 4 5% 3 5% 8% 46%	3223
September	1st to 10th	Night	16% 4 2 6% 4 4 4 3 6% 6% 44%	2015
	11th to 20th	Night	16% 6% 2 5% 3 3 3 3 5% 6% 48%	2200
	21st to end	Night	18% 6% 2 5% 4 3 4 3 4 6% 45%	2200
October	1st to 10th	Night	19% 6% 2 5% 3 3 3 3 5% 7% 43%	2364
	11th to 20th	Night	17% 8% 2 7% 4 5% 4 3 5% 6% 38%	2400
	21st to end	Night	23% 9% 3 7% 4 4 4 3 4 5% 33%	2765
November	1st to 10th	Night	21% 8% 3 7% 5% 3 4 3 4 6% 36%	2736
	11th to 20th	Night	19% 9% 3 7% 5% 4 4 4 5% 5% 34%	2940
	21st to end	Night	22% 11% 4 7% 4 4 4 3 5% 5% 31%	2940
December	1st to 10th	Night	17% 11% 4 8% 4 4 4 3 5% 6% 33%	4749
	11th to 20th	Night	22% 11% 2 7% 4 3 3 3 4 4 36%	5741
	21st to end	Night	21% 14% 4 9% 5% 3 3 3 4 5% 31%	7667

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% 2 10% 17% 9%	4094
	11th to 20th	Day	62% 2 9% 17% 8% 1	4583
	21st to end	Day	45% 3 8% 24% 19% 2	5557
February	1st to 10th	Day	53% 4 10% 21% 10% 2	1890
	11th to 20th	Day	53% 5% 10% 20% 11% 1	1851
	21st to end	Day	49% 4 9% 24% 11% 3	1681
March	1st to 10th	Day	63% 2 7% 13% 12% 3	4832
	11th to 20th	Day	60% 3 13% 16% 7% 2	5090
	21st to end	Day	64% 1 3 20% 10% 2	5587
April	1st to 10th	Day	57% 3 8% 16% 14% 3	2458
	11th to 20th	Day	52% 3 8% 22% 12% 1	2702
	21st to end	Day	54% 3 8% 17% 13% 5%	2730
May	1st to 10th	Day	62% 3 7% 18% 9% 1	5910
	11th to 20th	Day	56% 3 10% 21% 7% 2	6202
	21st to end	Day	54% 4 10% 18% 13% 1	7168
June	1st to 10th	Day	56% 4 10% 18% 11% 1	3000
	11th to 20th	Day	48% 4 11% 22% 13% 2	3000
	21st to end	Day	56% 5% 10% 18% 10% 1	3000
July	1st to 10th	Day	52% 3 15% 20% 9%	6745
	11th to 20th	Day	44% 3 14% 27% 11% 1	6739
	21st to end	Day	44% 4 13% 29% 10% 1	6420
August	1st to 10th	Day	52% 4 12% 26% 7%	4222
	11th to 20th	Day	48% 4 14% 26% 8%	4214
	21st to end	Day	39% 3 12% 27% 17%	4675
September	1st to 10th	Day	37% 5% 14% 29% 15%	2383
	11th to 20th	Day	39% 3 11% 28% 17% 2	2200
	21st to end	Day	42% 4 9% 27% 17% 1	2200
October	1st to 10th	Day	48% 3 10% 29% 10%	3308
	11th to 20th	Day	47% 2 10% 32% 9%	3240
	21st to end	Day	42% 2 15% 23% 18%	3320
November	1st to 10th	Day	51% 3 11% 22% 12% 1	1779
	11th to 20th	Day	49% 4 14% 19% 13% 1	1680
	21st to end	Day	58% 5% 11% 19% 6%	1680
December	1st to 10th	Day	54% 2 16% 19% 8%	2657
	11th to 20th	Day	55% 4 8% 19% 10% 4	2688
	21st to end	Day	54% 2 11% 17% 13% 2	3553
January	1st to 10th	Night	58% 2 10% 22% 8%	8831
	11th to 20th	Night	62% 2 8% 19% 8% 1	8363
	21st to end	Night	45% 3 8% 23% 18% 3	8622
February	1st to 10th	Night	52% 4 11% 19% 13% 1	2730
	11th to 20th	Night	55% 4 9% 20% 11% 2	2666
	21st to end	Night	52% 3 8% 22% 12% 2	2123
March	1st to 10th	Night	65% 2 4 13% 12% 3	5241
	11th to 20th	Night	59% 4 14% 14% 8% 1	5090
	21st to end	Night	62% 2 4 19% 12% 1	5587
April	1st to 10th	Night	58% 3 7% 17% 11% 4	2155
	11th to 20th	Night	52% 4 7% 21% 14% 1	1868
	21st to end	Night	54% 3 9% 18% 13% 2	1890
May	1st to 10th	Night	61% 3 9% 16% 10% 1	4070
	11th to 20th	Night	53% 4 11% 23% 7% 2	3712
	21st to end	Night	50% 5% 15% 21% 8% 1	3771
June	1st to 10th	Night	55% 6% 9% 20% 9% 1	1400
	11th to 20th	Night	48% 5% 13% 23% 10% 2	1400
	21st to end	Night	55% 4 11% 19% 9% 2	1400
July	1st to 10th	Night	53% 3 14% 21% 9%	3125
	11th to 20th	Night	49% 3 14% 27% 6%	3118
	21st to end	Night	43% 4 14% 27% 10%	4069
August	1st to 10th	Night	52% 6% 12% 22% 7%	2903
	11th to 20th	Night	46% 3 18% 25% 7%	2899
	21st to end	Night	38% 3 17% 25% 15% 2	3223
September	1st to 10th	Night	39% 4 12% 29% 14% 1	2015
	11th to 20th	Night	38% 3 12% 29% 16% 1	2200
	21st to end	Night	41% 5% 9% 29% 15% 1	2200
October	1st to 10th	Night	48% 2 11% 26% 12%	3871
	11th to 20th	Night	44% 2 10% 29% 14%	3899
	21st to end	Night	46% 2 14% 23% 14%	4465
November	1st to 10th	Night	50% 4 12% 23% 11% 1	2736
	11th to 20th	Night	51% 4 11% 21% 11% 1	2940
	21st to end	Night	56% 5% 13% 16% 9%	2940
December	1st to 10th	Night	54% 2 11% 25% 8%	4749
	11th to 20th	Night	53% 2 9% 21% 13% 1	5742
	21st to end	Night	58% 2 8% 20% 9% 3	7667

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	30% 17% 37% 15% 1	220
	11th to 20th	Day	37% 19% 32% 8% 5%	220
	21st to end	Day	24% 17% 36% 19% 4 1	392
February	1st to 10th	Day	26% 15% 33% 20% 5% 1	430
	11th to 20th	Day	27% 23% 32% 13% 4 1	426
	21st to end	Day	25% 22% 32% 18% 2	421
March	1st to 10th	Day	33% 20% 31% 13% 3	540
	11th to 20th	Day	31% 19% 30% 15% 4 1	540
	21st to end	Day	34% 19% 28% 13% 5% 1	594
April	1st to 10th	Day	37% 24% 24% 12% 3 1	540
	11th to 20th	Day	34% 20% 28% 12% 4 1	532
	21st to end	Day	31% 18% 30% 12% 7% 1	540
May	1st to 10th	Day	35% 16% 27% 16% 5% 1	507
	11th to 20th	Day	28% 16% 27% 20% 7% 2	669
	21st to end	Day	27% 15% 34% 17% 7% 1	790
June	1st to 10th	Day	30% 15% 28% 21% 6% 1	730
	11th to 20th	Day	29% 12% 28% 21% 8% 1	730
	21st to end	Day	29% 10% 31% 22% 8% 1	730
July	1st to 10th	Day	23% 9% 37% 21% 10% 1	720
	11th to 20th	Day	20% 6% 32% 28% 11% 2	718
	21st to end	Day	17% 7% 35% 29% 9% 2	578
August	1st to 10th	Day	17% 7% 37% 27% 10% 3	526
	11th to 20th	Day	19% 8% 26% 30% 14% 3	519
	21st to end	Day	18% 13% 26% 25% 13% 4	583
September	1st to 10th	Day	12% 13% 35% 26% 11% 3	530
	11th to 20th	Day	21% 11% 28% 23% 13% 4	530
	21st to end	Day	20% 15% 31% 20% 11% 4	530
October	1st to 10th	Day	22% 12% 22% 25% 15% 3	439
	11th to 20th	Day	25% 18% 28% 18% 10% 2	420
	21st to end	Day	29% 16% 32% 16% 6% 1	462
November	1st to 10th	Day	31% 16% 31% 16% 6% 1	425
	11th to 20th	Day	34% 18% 26% 16% 5% 1	430
	21st to end	Day	30% 20% 31% 14% 3	430
December	1st to 10th	Day	31% 18% 31% 17% 3	410
	11th to 20th	Day	36% 23% 31% 8% 3	220
	21st to end	Day	28% 25% 26% 17% 3 1	242
January	1st to 10th	Night	28% 19% 29% 21% 3	950
	11th to 20th	Night	29% 16% 28% 22% 5%	856
	21st to end	Night	18% 20% 34% 23% 5%	924
February	1st to 10th	Night	23% 20% 31% 21% 5%	840
	11th to 20th	Night	25% 21% 31% 18% 4 1	823
	21st to end	Night	24% 17% 33% 21% 4	692
March	1st to 10th	Night	26% 17% 34% 21% 2	840
	11th to 20th	Night	25% 17% 31% 20% 5%	840
	21st to end	Night	28% 15% 33% 20% 4	924
April	1st to 10th	Night	34% 17% 31% 17% 2	742
	11th to 20th	Night	31% 14% 33% 17% 5%	624
	21st to end	Night	30% 13% 31% 21% 5%	630
May	1st to 10th	Night	30% 14% 29% 23% 3	604
	11th to 20th	Night	29% 13% 33% 20% 5%	592
	21st to end	Night	20% 15% 37% 23% 5%	575
June	1st to 10th	Night	27% 9% 31% 28% 4	400
	11th to 20th	Night	21% 12% 33% 26% 8% 1	400
	21st to end	Night	32% 3 30% 29% 6% 1	400
July	1st to 10th	Night	19% 5% 38% 32% 6%	390
	11th to 20th	Night	20% 5% 27% 39% 10%	388
	21st to end	Night	20% 5% 34% 33% 8%	557
August	1st to 10th	Night	17% 5% 30% 37% 10% 1	598
	11th to 20th	Night	19% 6% 27% 36% 13%	592
	21st to end	Night	15% 7% 29% 33% 13% 1	660
September	1st to 10th	Night	18% 8% 37% 26% 11%	630
	11th to 20th	Night	20% 8% 24% 32% 15% 1	800
	21st to end	Night	21% 11% 28% 28% 11% 1	800
October	1st to 10th	Night	22% 10% 27% 30% 11% 1	800
	11th to 20th	Night	22% 12% 31% 25% 10% 1	800
	21st to end	Night	28% 18% 28% 20% 6%	880
November	1st to 10th	Night	30% 13% 30% 21% 6%	857
	11th to 20th	Night	28% 16% 29% 20% 6% 1	950
	21st to end	Night	30% 17% 30% 18% 4 1	950
December	1st to 10th	Night	34% 14% 29% 20% 4	950
	11th to 20th	Night	30% 22% 29% 17% 2	950
	21st to end	Night	31% 18% 28% 18% 4	1045

Page generated at 2026-04-29 03:21:45. Version ac07

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