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 2024-01-22.

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	20% 8% 3 6% 5% 3 5% 4 5% 6% 34%	74716
	Night	20% 9% 3 6% 5% 3 4 4 5% 6% 34%	75216
Transparency	Day	51% 5% 11% 21% 11% 1	74417
	Night	52% 4 11% 21% 11% 1	75051
Seeing	Day	26% 15% 30% 19% 7% 1	15216
	Night	25% 14% 31% 23% 6%	23256

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% 14% 5% 9% 5% 3 4 4 4 6% 29%	1327
	11th to 20th	Day	21% 13% 5% 9% 6% 3 4 4 3 4 30%	1486
	21st to end	Day	13% 10% 3 6% 4 3 5% 5% 5% 6% 39%	1720
February	1st to 10th	Day	16% 12% 3 6% 6% 4 6% 4 5% 6% 32%	1620
	11th to 20th	Day	16% 13% 4 7% 5% 4 6% 6% 5% 5% 29%	1573
	21st to end	Day	11% 11% 3 8% 6% 3 5% 5% 5% 7% 36%	1438
March	1st to 10th	Day	18% 13% 5% 7% 6% 3 5% 4 4 6% 29%	1890
	11th to 20th	Day	16% 9% 5% 8% 6% 3 5% 3 4 6% 35%	1980
	21st to end	Day	18% 11% 4 8% 6% 3 4 4 3 5% 33%	2178
April	1st to 10th	Day	22% 13% 4 7% 5% 3 4 4 4 6% 27%	2105
	11th to 20th	Day	21% 10% 3 4 5% 3 4 4 5% 7% 35%	2312
	21st to end	Day	26% 9% 3 5% 5% 3 3 3 5% 5% 32%	2340
May	1st to 10th	Day	24% 8% 3 6% 5% 3 4 5% 5% 6% 30%	2340
	11th to 20th	Day	25% 6% 3 6% 4 3 3 4 4 6% 35%	2428
	21st to end	Day	20% 6% 3 6% 6% 3 5% 4 5% 8% 34%	2804
June	1st to 10th	Day	26% 8% 3 6% 6% 3 5% 4 4 6% 29%	2700
	11th to 20th	Day	23% 6% 2 6% 4 2 5% 4 6% 7% 35%	2700
	21st to end	Day	26% 7% 3 6% 6% 3 5% 5% 5% 6% 28%	2700
July	1st to 10th	Day	17% 5% 2 5% 5% 4 5% 5% 7% 8% 36%	2700
	11th to 20th	Day	17% 6% 3 5% 5% 3 5% 6% 7% 9% 35%	2700
	21st to end	Day	16% 7% 2 6% 7% 4 6% 6% 7% 8% 31%	2620
August	1st to 10th	Day	18% 6% 3 6% 6% 4 5% 5% 5% 7% 36%	2327
	11th to 20th	Day	17% 7% 3 6% 6% 5% 5% 5% 5% 7% 34%	2304
	21st to end	Day	15% 5% 2 5% 5% 3 5% 4 5% 7% 43%	2574
September	1st to 10th	Day	13% 5% 2 5% 5% 3 5% 4 6% 7% 45%	2146
	11th to 20th	Day	18% 6% 2 4 4 3 3 4 4 5% 47%	1980
	21st to end	Day	20% 6% 2 4 5% 2 3 4 4 6% 45%	1980
October	1st to 10th	Day	18% 7% 2 5% 4 3 4 5% 5% 6% 40%	1832
	11th to 20th	Day	20% 7% 2 6% 5% 3 4 4 5% 7% 38%	1800
	21st to end	Day	23% 7% 3 7% 6% 4 5% 4 4 6% 31%	1864
November	1st to 10th	Day	22% 7% 3 6% 5% 3 3 4 4 6% 36%	1607
	11th to 20th	Day	20% 8% 3 5% 4 3 4 5% 5% 7% 37%	1520
	21st to end	Day	22% 11% 4 7% 5% 4 4 4 4 4 32%	1520
December	1st to 10th	Day	24% 12% 3 6% 4 3 5% 3 3 6% 30%	1502
	11th to 20th	Day	22% 12% 4 9% 6% 3 4 3 4 5% 28%	1668
	21st to end	Day	23% 10% 4 6% 4 3 3 4 4 5% 35%	2431
January	1st to 10th	Night	17% 12% 4 8% 7% 3 4 4 4 7% 30%	2838
	11th to 20th	Night	19% 13% 4 8% 6% 4 4 5% 4 5% 28%	2689
	21st to end	Night	13% 9% 4 7% 6% 3 5% 5% 5% 7% 35%	2668
February	1st to 10th	Night	16% 12% 3 6% 6% 3 5% 4 6% 7% 32%	2340
	11th to 20th	Night	18% 12% 4 7% 7% 4 4 5% 5% 7% 29%	2273
	21st to end	Night	15% 13% 4 6% 6% 3 6% 6% 4 5% 32%	1816
March	1st to 10th	Night	16% 14% 5% 7% 5% 3 4 4 4 4 34%	2057
	11th to 20th	Night	18% 10% 3 8% 6% 4 4 4 4 7% 31%	1979
	21st to end	Night	19% 10% 4 7% 6% 3 4 3 4 4 35%	2178
April	1st to 10th	Night	26% 10% 3 6% 5% 2 4 4 5% 5% 29%	1849
	11th to 20th	Night	24% 7% 2 6% 4 3 4 4 5% 6% 35%	1598
	21st to end	Night	27% 9% 4 5% 4 2 4 4 4 5% 31%	1620
May	1st to 10th	Night	23% 7% 3 5% 4 3 5% 6% 5% 6% 32%	1620
	11th to 20th	Night	27% 7% 4 5% 5% 3 4 4 4 5% 33%	1466
	21st to end	Night	17% 9% 4 6% 6% 4 5% 5% 5% 6% 35%	1484
June	1st to 10th	Night	26% 8% 2 6% 5% 3 5% 5% 5% 7% 28%	1260
	11th to 20th	Night	21% 5% 2 6% 5% 3 6% 4 4 6% 36%	1260
	21st to end	Night	28% 5% 3 5% 5% 3 4 4 4 7% 32%	1260
July	1st to 10th	Night	18% 6% 3 6% 6% 2 4 6% 5% 9% 36%	1260
	11th to 20th	Night	17% 5% 3 5% 5% 5% 4 5% 6% 10% 35%	1260
	21st to end	Night	19% 6% 4 6% 5% 3 5% 6% 6% 7% 32%	1675
August	1st to 10th	Night	13% 7% 3 6% 5% 3 5% 5% 6% 7% 40%	1612
	11th to 20th	Night	18% 7% 3 7% 6% 3 5% 5% 5% 7% 35%	1596
	21st to end	Night	14% 6% 2 5% 4 3 3 5% 5% 8% 44%	1782
September	1st to 10th	Night	17% 4 2 5% 5% 3 5% 4 5% 7% 44%	1812
	11th to 20th	Night	17% 6% 2 4 4 2 3 4 5% 6% 46%	1980
	21st to end	Night	19% 5% 2 4 5% 3 3 4 4 6% 46%	1980
October	1st to 10th	Night	19% 6% 2 5% 4 3 3 4 5% 7% 41%	2127
	11th to 20th	Night	18% 8% 2 6% 6% 4 5% 4 5% 7% 37%	2160
	21st to end	Night	25% 8% 3 6% 5% 3 4 4 4 6% 33%	2488
November	1st to 10th	Night	21% 8% 3 6% 5% 2 4 4 4 6% 37%	2468
	11th to 20th	Night	19% 8% 3 7% 5% 3 5% 4 5% 6% 35%	2660
	21st to end	Night	21% 10% 4 6% 5% 3 5% 4 5% 6% 32%	2660
December	1st to 10th	Night	27% 11% 4 7% 5% 2 4 4 4 5% 29%	2674
	11th to 20th	Night	26% 11% 3 6% 6% 3 4 4 5% 4 28%	3531
	21st to end	Night	23% 13% 4 6% 5% 2 4 4 3 4 32%	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	57% 5% 12% 16% 9% 1	1328
	11th to 20th	Day	60% 4 8% 18% 8% 1	1486
	21st to end	Day	46% 4 10% 22% 15% 2	1720
February	1st to 10th	Day	53% 4 12% 20% 9% 2	1620
	11th to 20th	Day	55% 5% 10% 17% 10% 1	1581
	21st to end	Day	49% 4 10% 24% 11% 3	1438
March	1st to 10th	Day	58% 3 8% 19% 10% 2	1894
	11th to 20th	Day	52% 3 11% 18% 13% 3	1980
	21st to end	Day	55% 3 7% 20% 11% 4	2178
April	1st to 10th	Day	58% 4 8% 15% 13% 2	2105
	11th to 20th	Day	50% 4 9% 23% 13% 1	2312
	21st to end	Day	55% 3 8% 16% 13% 5%	2340
May	1st to 10th	Day	56% 5% 7% 19% 11% 2	2340
	11th to 20th	Day	51% 4 8% 22% 12% 2	2432
	21st to end	Day	49% 5% 13% 23% 9% 1	2804
June	1st to 10th	Day	57% 4 10% 17% 11% 1	2700
	11th to 20th	Day	49% 4 11% 21% 13% 2	2700
	21st to end	Day	56% 5% 11% 17% 10% 1	2700
July	1st to 10th	Day	44% 7% 16% 22% 11% 1	2625
	11th to 20th	Day	43% 7% 15% 24% 10% 1	2619
	21st to end	Day	48% 7% 13% 22% 9%	2473
August	1st to 10th	Day	47% 6% 14% 25% 7%	2314
	11th to 20th	Day	47% 7% 12% 25% 8%	2304
	21st to end	Day	41% 5% 13% 28% 13%	2574
September	1st to 10th	Day	38% 5% 14% 28% 14%	2146
	11th to 20th	Day	40% 3 10% 27% 17% 2	1980
	21st to end	Day	42% 4 9% 27% 17% 1	1980
October	1st to 10th	Day	44% 5% 12% 27% 13%	1832
	11th to 20th	Day	47% 4 14% 27% 8%	1800
	21st to end	Day	55% 3 11% 19% 12%	1864
November	1st to 10th	Day	50% 3 11% 22% 13% 1	1607
	11th to 20th	Day	48% 4 14% 19% 13% 1	1520
	21st to end	Day	57% 6% 12% 19% 7%	1520
December	1st to 10th	Day	58% 4 10% 20% 7% 1	1502
	11th to 20th	Day	61% 4 8% 17% 9% 1	1668
	21st to end	Day	55% 3 12% 18% 10% 2	2431
January	1st to 10th	Night	56% 4 11% 19% 9% 1	2838
	11th to 20th	Night	58% 5% 10% 17% 8% 1	2689
	21st to end	Night	48% 5% 11% 23% 12% 2	2668
February	1st to 10th	Night	52% 4 12% 19% 12% 1	2340
	11th to 20th	Night	56% 5% 9% 18% 11% 2	2276
	21st to end	Night	54% 4 8% 20% 12% 2	1816
March	1st to 10th	Night	54% 4 7% 20% 13% 2	2066
	11th to 20th	Night	54% 4 8% 17% 14% 2	1980
	21st to end	Night	55% 3 6% 20% 14% 2	2178
April	1st to 10th	Night	59% 4 7% 16% 11% 4	1849
	11th to 20th	Night	50% 5% 8% 21% 15% 2	1598
	21st to end	Night	56% 3 9% 17% 12% 2	1620
May	1st to 10th	Night	53% 5% 9% 19% 12% 2	1620
	11th to 20th	Night	55% 3 8% 20% 11% 1	1467
	21st to end	Night	50% 7% 12% 18% 12% 1	1485
June	1st to 10th	Night	55% 6% 9% 19% 9% 2	1260
	11th to 20th	Night	49% 5% 12% 22% 10% 2	1260
	21st to end	Night	54% 5% 11% 19% 8% 2	1260
July	1st to 10th	Night	45% 6% 18% 22% 10%	1225
	11th to 20th	Night	45% 6% 15% 23% 11%	1218
	21st to end	Night	50% 7% 12% 21% 9% 1	1583
August	1st to 10th	Night	42% 7% 16% 26% 9%	1600
	11th to 20th	Night	48% 5% 17% 23% 7%	1596
	21st to end	Night	38% 5% 16% 27% 13% 1	1782
September	1st to 10th	Night	40% 5% 13% 28% 13% 1	1812
	11th to 20th	Night	39% 4 12% 28% 16% 1	1980
	21st to end	Night	41% 5% 9% 29% 15% 1	1980
October	1st to 10th	Night	43% 4 10% 27% 15% 1	2127
	11th to 20th	Night	48% 4 10% 27% 10% 1	2160
	21st to end	Night	54% 4 10% 20% 12% 1	2488
November	1st to 10th	Night	49% 4 12% 22% 11% 1	2468
	11th to 20th	Night	50% 5% 12% 21% 11% 1	2660
	21st to end	Night	54% 6% 13% 17% 9%	2660
December	1st to 10th	Night	59% 4 9% 20% 7%	2674
	11th to 20th	Night	60% 4 8% 19% 9%	3532
	21st to end	Night	58% 3 10% 20% 6% 4	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	30% 18% 34% 16% 2	180
	11th to 20th	Day	35% 20% 32% 10% 3	180
	21st to end	Day	24% 17% 36% 18% 4 1	306
February	1st to 10th	Day	29% 15% 34% 18% 3	340
	11th to 20th	Day	28% 24% 31% 14% 4	336
	21st to end	Day	24% 23% 31% 20% 2	328
March	1st to 10th	Day	31% 20% 32% 14% 3	420
	11th to 20th	Day	27% 19% 32% 16% 5% 1	420
	21st to end	Day	30% 20% 28% 14% 7% 1	462
April	1st to 10th	Day	37% 24% 21% 13% 3 1	420
	11th to 20th	Day	32% 19% 29% 14% 5% 1	412
	21st to end	Day	33% 19% 28% 13% 6% 1	420
May	1st to 10th	Day	34% 17% 27% 16% 5% 1	423
	11th to 20th	Day	28% 18% 27% 18% 7% 2	574
	21st to end	Day	26% 16% 34% 16% 7% 1	680
June	1st to 10th	Day	31% 15% 28% 20% 6% 1	630
	11th to 20th	Day	29% 12% 28% 21% 9% 1	630
	21st to end	Day	27% 10% 30% 24% 9% 1	630
July	1st to 10th	Day	23% 9% 36% 21% 10% 1	620
	11th to 20th	Day	20% 6% 33% 27% 11% 2	618
	21st to end	Day	16% 7% 35% 30% 10% 2	490
August	1st to 10th	Day	17% 7% 38% 27% 9% 2	446
	11th to 20th	Day	21% 8% 27% 30% 12% 2	439
	21st to end	Day	20% 14% 23% 26% 14% 3	495
September	1st to 10th	Day	12% 12% 35% 28% 9% 3	450
	11th to 20th	Day	24% 11% 29% 22% 11% 3	450
	21st to end	Day	21% 16% 31% 17% 11% 4	450
October	1st to 10th	Day	23% 13% 23% 23% 14% 4	376
	11th to 20th	Day	23% 18% 29% 18% 10% 2	360
	21st to end	Day	30% 17% 31% 17% 5% 1	396
November	1st to 10th	Day	29% 14% 32% 17% 7% 1	365
	11th to 20th	Day	32% 18% 28% 15% 6% 1	370
	21st to end	Day	30% 21% 31% 14% 3	370
December	1st to 10th	Day	31% 18% 31% 16% 4	352
	11th to 20th	Day	37% 22% 31% 8% 3	180
	21st to end	Day	30% 25% 28% 14% 3 1	198
January	1st to 10th	Night	27% 19% 29% 22% 3	850
	11th to 20th	Night	28% 17% 29% 21% 5%	774
	21st to end	Night	18% 20% 34% 23% 5%	800
February	1st to 10th	Night	24% 21% 30% 21% 4	720
	11th to 20th	Night	26% 21% 30% 18% 3 1	703
	21st to end	Night	23% 18% 32% 21% 4	592
March	1st to 10th	Night	25% 16% 35% 22% 2	720
	11th to 20th	Night	24% 18% 32% 20% 6%	720
	21st to end	Night	25% 16% 33% 21% 5%	792
April	1st to 10th	Night	34% 15% 31% 17% 2	637
	11th to 20th	Night	28% 16% 33% 17% 5%	534
	21st to end	Night	32% 14% 29% 20% 5%	540
May	1st to 10th	Night	29% 14% 29% 24% 4 1	540
	11th to 20th	Night	30% 14% 33% 17% 5%	532
	21st to end	Night	20% 16% 37% 23% 5%	517
June	1st to 10th	Night	28% 9% 31% 26% 4	360
	11th to 20th	Night	21% 13% 33% 26% 7% 1	360
	21st to end	Night	31% 4 30% 29% 6% 1	360
July	1st to 10th	Night	19% 5% 39% 30% 6%	350
	11th to 20th	Night	19% 5% 27% 39% 10%	348
	21st to end	Night	21% 5% 34% 32% 7%	501
August	1st to 10th	Night	16% 6% 31% 37% 9% 1	538
	11th to 20th	Night	20% 6% 25% 36% 12%	532
	21st to end	Night	16% 7% 29% 33% 13% 1	594
September	1st to 10th	Night	17% 8% 38% 25% 11% 1	566
	11th to 20th	Night	22% 8% 25% 30% 13% 1	720
	21st to end	Night	21% 12% 30% 26% 11% 1	720
October	1st to 10th	Night	22% 10% 28% 29% 11% 1	720
	11th to 20th	Night	21% 12% 33% 24% 10% 1	720
	21st to end	Night	29% 18% 30% 18% 5%	792
November	1st to 10th	Night	28% 13% 29% 22% 7%	769
	11th to 20th	Night	27% 17% 29% 21% 6% 1	850
	21st to end	Night	28% 18% 30% 19% 4	850
December	1st to 10th	Night	35% 14% 30% 18% 3	850
	11th to 20th	Night	31% 20% 29% 17% 2	850
	21st to end	Night	31% 19% 27% 18% 4	935

Page generated at 2024-01-19 10:28:37. Version ac07

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