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 2025-01-07.

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% 9% 3 7% 5% 4 4 4 5% 6% 34%	104899
	Night	19% 10% 3 7% 4 4 4 4 5% 6% 34%	104237
Transparency	Day	51% 4 11% 22% 11% 1	108416
	Night	52% 4 11% 22% 11% 1	108811
Seeing	Day	27% 15% 30% 19% 7% 1	16528
	Night	25% 14% 31% 23% 6%	24503

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% 13% 4 12% 5% 4 4 3 4 6% 32%	2249
	11th to 20th	Day	16% 11% 5% 10% 4 4 4 3 3 4 35%	2462
	21st to end	Day	13% 10% 3 8% 4 4 5% 4 6% 7% 35%	2998
February	1st to 10th	Day	16% 13% 4 6% 6% 4 5% 4 5% 5% 31%	1710
	11th to 20th	Day	15% 13% 3 8% 5% 5% 6% 4 6% 5% 30%	1663
	21st to end	Day	11% 12% 3 8% 6% 5% 4 4 5% 6% 36%	1525
March	1st to 10th	Day	24% 12% 4 8% 5% 3 4 3 4 5% 29%	3293
	11th to 20th	Day	19% 15% 4 10% 6% 5% 5% 3 4 5% 25%	3480
	21st to end	Day	28% 12% 4 8% 5% 3 4 3 4 6% 23%	3816
April	1st to 10th	Day	22% 14% 4 7% 4 4 4 3 4 6% 28%	2223
	11th to 20th	Day	21% 10% 2 6% 4 3 4 3 5% 6% 35%	2442
	21st to end	Day	25% 9% 3 6% 4 4 3 3 5% 5% 33%	2470
May	1st to 10th	Day	21% 11% 2 7% 5% 5% 4 4 5% 7% 30%	4106
	11th to 20th	Day	19% 8% 3 7% 5% 4 4 3 5% 7% 35%	4320
	21st to end	Day	18% 7% 2 7% 5% 5% 5% 4 6% 8% 32%	4986
June	1st to 10th	Day	25% 9% 3 7% 5% 4 5% 4 4 6% 29%	2850
	11th to 20th	Day	22% 7% 2 6% 4 3 5% 3 6% 7% 35%	2850
	21st to end	Day	26% 8% 3 6% 5% 4 4 4 5% 6% 28%	2850
July	1st to 10th	Day	16% 6% 2 7% 6% 6% 6% 4 7% 8% 32%	4760
	11th to 20th	Day	19% 7% 2 6% 4 5% 5% 4 6% 8% 35%	4760
	21st to end	Day	16% 7% 2 7% 5% 5% 5% 4 6% 7% 35%	4595
August	1st to 10th	Day	20% 8% 3 7% 5% 4 5% 4 5% 7% 32%	4105
	11th to 20th	Day	14% 7% 3 8% 6% 6% 5% 4 6% 8% 32%	4045
	21st to end	Day	14% 5% 2 5% 4 4 5% 3 5% 8% 44%	4532
September	1st to 10th	Day	13% 5% 2 5% 4 4 4 3 6% 7% 46%	2264
	11th to 20th	Day	17% 6% 2 5% 3 4 3 3 4 5% 48%	2090
	21st to end	Day	19% 6% 2 5% 4 3 3 3 5% 6% 43%	2090
October	1st to 10th	Day	18% 7% 2 6% 4 4 4 4 5% 7% 39%	1933
	11th to 20th	Day	19% 8% 2 7% 4 4 4 3 5% 7% 38%	1900
	21st to end	Day	22% 8% 3 8% 4 5% 4 3 4 6% 32%	1967
November	1st to 10th	Day	21% 8% 3 8% 4 4 3 3 4 6% 36%	1693
	11th to 20th	Day	21% 8% 2 6% 3 4 4 4 5% 7% 36%	1600
	21st to end	Day	21% 13% 4 8% 4 5% 3 4 4 4 31%	1600
December	1st to 10th	Day	20% 12% 3 7% 3 3 4 3 5% 7% 33%	2578
	11th to 20th	Day	22% 11% 3 7% 5% 4 3 2 3 4 35%	2618
	21st to end	Day	19% 13% 4 7% 3 3 4 3 4 5% 34%	3476
January	1st to 10th	Night	14% 11% 4 8% 5% 4 5% 4 5% 7% 34%	4839
	11th to 20th	Night	16% 12% 3 11% 6% 5% 4 3 5% 5% 31%	4495
	21st to end	Night	14% 12% 4 8% 4 4 4 4 6% 7% 33%	4656
February	1st to 10th	Night	16% 13% 3 7% 5% 4 4 3 6% 6% 32%	2470
	11th to 20th	Night	17% 13% 4 8% 6% 5% 4 4 6% 6% 29%	2403
	21st to end	Night	15% 13% 3 6% 6% 5% 5% 4 4 5% 33%	1927
March	1st to 10th	Night	24% 15% 3 6% 4 5% 5% 3 4 4 28%	3547
	11th to 20th	Night	21% 14% 4 9% 5% 6% 5% 4 4 6% 23%	3479
	21st to end	Night	32% 11% 3 6% 4 3 3 3 5% 4 26%	3816
April	1st to 10th	Night	26% 11% 3 7% 4 3 4 3 5% 5% 29%	1951
	11th to 20th	Night	24% 8% 2 7% 3 3 4 3 5% 6% 35%	1688
	21st to end	Night	25% 10% 3 6% 3 3 4 3 5% 5% 32%	1710
May	1st to 10th	Night	22% 9% 3 7% 4 4 5% 4 5% 6% 32%	2834
	11th to 20th	Night	20% 7% 3 6% 4 4 4 4 5% 7% 35%	2582
	21st to end	Night	16% 8% 3 7% 5% 4 5% 4 5% 7% 35%	2627
June	1st to 10th	Night	25% 9% 2 7% 4 5% 5% 5% 5% 7% 28%	1330
	11th to 20th	Night	20% 6% 3 6% 5% 4 5% 3 5% 6% 37%	1330
	21st to end	Night	28% 5% 2 6% 5% 5% 4 4 4 6% 30%	1330
July	1st to 10th	Night	16% 6% 3 7% 5% 5% 6% 5% 6% 9% 33%	2210
	11th to 20th	Night	20% 6% 3 6% 5% 5% 5% 4 6% 9% 32%	2210
	21st to end	Night	17% 7% 2 6% 4 4 4 5% 6% 6% 37%	2922
August	1st to 10th	Night	18% 8% 5% 8% 4 5% 5% 5% 6% 7% 29%	2825
	11th to 20th	Night	13% 7% 3 9% 5% 4 6% 4 7% 8% 34%	2782
	21st to end	Night	14% 5% 2 5% 4 4 5% 3 5% 8% 46%	3124
September	1st to 10th	Night	16% 4 2 6% 4 4 4 3 6% 7% 44%	1914
	11th to 20th	Night	17% 6% 2 5% 3 3 3 3 5% 6% 46%	2090
	21st to end	Night	19% 6% 2 5% 4 3 3 3 4 6% 45%	2090
October	1st to 10th	Night	20% 7% 2 6% 3 3 3 3 5% 7% 41%	2246
	11th to 20th	Night	17% 8% 2 7% 4 5% 4 3 5% 6% 38%	2280
	21st to end	Night	24% 9% 3 7% 4 4 4 3 4 6% 34%	2627
November	1st to 10th	Night	21% 8% 3 7% 5% 3 4 3 4 6% 37%	2602
	11th to 20th	Night	20% 9% 3 7% 5% 4 4 4 5% 5% 34%	2800
	21st to end	Night	22% 11% 4 7% 4 4 4 3 5% 5% 31%	2800
December	1st to 10th	Night	17% 11% 4 8% 4 4 4 3 5% 6% 33%	4608
	11th to 20th	Night	23% 11% 2 7% 4 3 3 2 4 4 37%	5591
	21st to end	Night	21% 14% 4 8% 4 3 3 3 4 5% 31%	7502

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% 4 16% 17% 8%	2250
	11th to 20th	Day	54% 3 6% 25% 11% 1	2462
	21st to end	Day	48% 5% 12% 19% 14% 1	2998
February	1st to 10th	Day	53% 4 11% 20% 10% 2	1710
	11th to 20th	Day	55% 5% 10% 18% 11% 1	1671
	21st to end	Day	49% 4 9% 24% 10% 3	1525
March	1st to 10th	Day	60% 3 9% 17% 8% 4	3297
	11th to 20th	Day	63% 3 9% 15% 8% 2	3480
	21st to end	Day	64% 2 5% 17% 9% 2	3816
April	1st to 10th	Day	58% 3 8% 16% 13% 3	2223
	11th to 20th	Day	50% 4 9% 23% 13% 1	2442
	21st to end	Day	53% 3 8% 17% 13% 5%	2470
May	1st to 10th	Day	55% 4 9% 23% 8% 1	4120
	11th to 20th	Day	50% 4 13% 24% 8% 1	4324
	21st to end	Day	49% 5% 13% 18% 14%	4986
June	1st to 10th	Day	57% 5% 10% 18% 10% 1	2850
	11th to 20th	Day	48% 4 11% 21% 13% 2	2850
	21st to end	Day	56% 5% 10% 17% 10% 1	2850
July	1st to 10th	Day	48% 4 15% 21% 11%	4685
	11th to 20th	Day	47% 4 14% 24% 10%	4679
	21st to end	Day	47% 5% 13% 26% 8% 1	4448
August	1st to 10th	Day	53% 4 12% 25% 6%	4092
	11th to 20th	Day	49% 4 14% 25% 8%	4084
	21st to end	Day	39% 3 13% 27% 17%	4532
September	1st to 10th	Day	37% 5% 14% 29% 15%	2264
	11th to 20th	Day	40% 3 10% 28% 17% 2	2090
	21st to end	Day	43% 4 9% 27% 16% 1	2090
October	1st to 10th	Day	49% 3 10% 29% 9%	3206
	11th to 20th	Day	46% 2 10% 32% 9%	3140
	21st to end	Day	41% 2 16% 23% 18%	3217
November	1st to 10th	Day	51% 3 11% 22% 12% 1	1693
	11th to 20th	Day	49% 4 14% 18% 14% 1	1600
	21st to end	Day	58% 5% 12% 19% 6%	1600
December	1st to 10th	Day	54% 2 17% 19% 8%	2578
	11th to 20th	Day	55% 4 8% 19% 10% 4	2618
	21st to end	Day	55% 2 11% 17% 13% 2	3476
January	1st to 10th	Night	50% 4 14% 24% 7% 1	4839
	11th to 20th	Night	55% 4 9% 22% 9% 1	4495
	21st to end	Night	51% 5% 10% 22% 12% 1	4656
February	1st to 10th	Night	52% 4 12% 19% 12% 1	2470
	11th to 20th	Night	56% 4 9% 18% 11% 2	2406
	21st to end	Night	53% 4 8% 21% 12% 3	1927
March	1st to 10th	Night	62% 3 6% 17% 9% 1	3556
	11th to 20th	Night	63% 5% 9% 14% 8% 1	3480
	21st to end	Night	63% 2 5% 17% 11% 2	3816
April	1st to 10th	Night	58% 4 7% 16% 12% 4	1951
	11th to 20th	Night	50% 5% 7% 21% 15% 1	1688
	21st to end	Night	54% 3 9% 18% 14% 2	1710
May	1st to 10th	Night	53% 4 13% 20% 8% 1	2840
	11th to 20th	Night	49% 4 15% 24% 8% 1	2583
	21st to end	Night	47% 7% 15% 21% 8% 1	2628
June	1st to 10th	Night	55% 6% 9% 19% 8% 1	1330
	11th to 20th	Night	48% 5% 13% 23% 10% 2	1330
	21st to end	Night	56% 5% 11% 19% 8% 2	1330
July	1st to 10th	Night	48% 3 16% 22% 11%	2175
	11th to 20th	Night	50% 4 14% 24% 7%	2168
	21st to end	Night	46% 6% 12% 27% 9%	2830
August	1st to 10th	Night	53% 6% 13% 21% 7%	2813
	11th to 20th	Night	47% 3 18% 25% 7%	2809
	21st to end	Night	38% 3 17% 24% 16% 2	3124
September	1st to 10th	Night	40% 5% 12% 29% 14% 1	1914
	11th to 20th	Night	39% 4 13% 29% 16% 1	2090
	21st to end	Night	42% 5% 9% 29% 15% 1	2090
October	1st to 10th	Night	49% 2 11% 26% 11%	3753
	11th to 20th	Night	44% 2 9% 30% 15%	3779
	21st to end	Night	45% 3 14% 23% 15%	4327
November	1st to 10th	Night	49% 4 12% 23% 11% 1	2602
	11th to 20th	Night	51% 5% 11% 21% 11% 1	2800
	21st to end	Night	55% 6% 13% 16% 9%	2800
December	1st to 10th	Night	54% 2 11% 25% 8%	4608
	11th to 20th	Night	53% 3 9% 21% 14% 1	5592
	21st to end	Night	58% 2 8% 20% 9% 3	7502

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	29% 17% 37% 15% 2	192
	11th to 20th	Day	36% 20% 32% 9% 3	180
	21st to end	Day	24% 16% 35% 19% 5% 1	333
February	1st to 10th	Day	29% 14% 34% 18% 5%	370
	11th to 20th	Day	27% 24% 32% 13% 4 1	366
	21st to end	Day	25% 22% 32% 19% 2	361
March	1st to 10th	Day	32% 20% 31% 13% 3	460
	11th to 20th	Day	28% 19% 30% 17% 4 1	460
	21st to end	Day	32% 20% 28% 13% 6% 1	506
April	1st to 10th	Day	38% 24% 22% 13% 3 1	460
	11th to 20th	Day	32% 20% 29% 13% 5% 1	452
	21st to end	Day	32% 19% 29% 13% 6% 1	460
May	1st to 10th	Day	33% 17% 27% 16% 5% 1	463
	11th to 20th	Day	26% 17% 27% 20% 8% 2	622
	21st to end	Day	25% 16% 35% 16% 7% 1	735
June	1st to 10th	Day	30% 16% 28% 19% 6% 1	680
	11th to 20th	Day	28% 12% 28% 22% 9% 1	680
	21st to end	Day	29% 10% 30% 22% 8% 1	680
July	1st to 10th	Day	23% 9% 36% 21% 10% 1	670
	11th to 20th	Day	20% 6% 33% 28% 11% 2	668
	21st to end	Day	17% 7% 35% 29% 10% 2	534
August	1st to 10th	Day	18% 7% 37% 27% 9% 2	486
	11th to 20th	Day	20% 8% 28% 30% 12% 3	479
	21st to end	Day	19% 12% 25% 25% 14% 4	539
September	1st to 10th	Day	12% 13% 36% 27% 10% 3	490
	11th to 20th	Day	22% 10% 29% 22% 13% 3	490
	21st to end	Day	20% 14% 30% 20% 12% 4	490
October	1st to 10th	Day	23% 12% 23% 24% 14% 3	407
	11th to 20th	Day	24% 18% 27% 19% 10% 2	390
	21st to end	Day	29% 17% 32% 17% 5% 1	429
November	1st to 10th	Day	30% 15% 32% 16% 6% 1	395
	11th to 20th	Day	34% 18% 26% 15% 6% 1	400
	21st to end	Day	31% 21% 30% 15% 3	400
December	1st to 10th	Day	31% 17% 31% 17% 4	381
	11th to 20th	Day	36% 22% 31% 9% 3	200
	21st to end	Day	29% 23% 27% 16% 3 1	220
January	1st to 10th	Night	28% 19% 29% 22% 3	881
	11th to 20th	Night	28% 17% 29% 21% 5%	774
	21st to end	Night	18% 20% 34% 22% 5%	836
February	1st to 10th	Night	24% 20% 30% 21% 5%	760
	11th to 20th	Night	25% 22% 31% 18% 3 1	743
	21st to end	Night	24% 18% 32% 21% 4	628
March	1st to 10th	Night	26% 16% 35% 21% 2	760
	11th to 20th	Night	24% 18% 32% 20% 6%	760
	21st to end	Night	26% 16% 33% 20% 5%	836
April	1st to 10th	Night	34% 16% 31% 18% 2	672
	11th to 20th	Night	29% 15% 34% 17% 5%	564
	21st to end	Night	31% 14% 31% 20% 5%	570
May	1st to 10th	Night	29% 15% 29% 23% 4 1	570
	11th to 20th	Night	29% 13% 33% 20% 5%	562
	21st to end	Night	19% 16% 38% 23% 5%	546
June	1st to 10th	Night	27% 9% 33% 26% 4	380
	11th to 20th	Night	20% 12% 33% 26% 8% 1	380
	21st to end	Night	32% 3 29% 29% 6% 1	380
July	1st to 10th	Night	19% 5% 38% 31% 6%	370
	11th to 20th	Night	20% 5% 27% 39% 10%	368
	21st to end	Night	21% 5% 34% 32% 8%	529
August	1st to 10th	Night	17% 5% 31% 36% 9% 1	568
	11th to 20th	Night	20% 6% 26% 36% 12%	562
	21st to end	Night	16% 7% 29% 32% 14% 1	627
September	1st to 10th	Night	17% 8% 38% 25% 11% 1	598
	11th to 20th	Night	21% 8% 25% 31% 15% 1	760
	21st to end	Night	22% 11% 28% 28% 11% 1	760
October	1st to 10th	Night	23% 9% 27% 30% 10% 1	760
	11th to 20th	Night	21% 13% 32% 24% 10% 1	760
	21st to end	Night	28% 18% 29% 19% 5%	836
November	1st to 10th	Night	29% 12% 31% 22% 6%	813
	11th to 20th	Night	28% 17% 29% 20% 6% 1	900
	21st to end	Night	31% 17% 30% 18% 4	900
December	1st to 10th	Night	34% 14% 29% 19% 4	900
	11th to 20th	Night	30% 21% 29% 18% 2	900
	21st to end	Night	31% 18% 27% 19% 4	990

Page generated at 2025-01-04 04:24:03. Version ac07

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