Fundy National Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Fundy National Park clear sky chart from 2005-11-06 to 2025-04-11.

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% 11% 4 8% 5% 4 4 4 5% 6% 31%	113418
	Night	19% 11% 4 7% 5% 4 4 3 5% 6% 33%	114953
Transparency	Day	30% 43% 8% 12% 6% 1	117015
	Night	31% 41% 7% 13% 8% 1	119520
Seeing	Day	23% 18% 30% 21% 7% 1	17267
	Night	24% 17% 30% 22% 7% 1	25083

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	11% 16% 5% 9% 6% 5% 4 4 5% 6% 29%	3157
	11th to 20th	Day	13% 15% 5% 10% 6% 5% 4 3 5% 4 31%	3528
	21st to end	Day	10% 10% 4 8% 4 4 5% 4 6% 7% 38%	4466
February	1st to 10th	Day	16% 13% 5% 9% 4 5% 4 4 4 5% 31%	1800
	11th to 20th	Day	15% 15% 5% 9% 6% 5% 3 4 5% 5% 29%	1753
	21st to end	Day	11% 15% 5% 9% 5% 3 4 3 5% 6% 34%	1525
March	1st to 10th	Day	20% 15% 4 12% 4 4 3 3 3 4 27%	4876
	11th to 20th	Day	17% 18% 5% 8% 4 4 4 3 5% 6% 27%	4980
	21st to end	Day	24% 15% 6% 7% 5% 4 4 4 6% 6% 20%	5466
April	1st to 10th	Day	21% 16% 5% 7% 4 4 4 4 5% 5% 25%	2351
	11th to 20th	Day	18% 14% 3 7% 6% 4 3 3 5% 6% 31%	2400
	21st to end	Day	22% 12% 4 7% 4 4 3 4 5% 6% 29%	2470
May	1st to 10th	Day	21% 15% 4 9% 6% 4 4 3 4 6% 24%	4156
	11th to 20th	Day	17% 9% 3 7% 5% 5% 4 3 4 6% 36%	4398
	21st to end	Day	19% 9% 3 7% 5% 5% 5% 5% 6% 8% 27%	4836
June	1st to 10th	Day	25% 11% 3 9% 4 5% 4 4 5% 6% 25%	2792
	11th to 20th	Day	21% 9% 2 6% 5% 3 4 4 6% 7% 31%	2850
	21st to end	Day	29% 9% 2 7% 5% 3 4 3 5% 5% 27%	2850
July	1st to 10th	Day	18% 7% 3 7% 4 5% 5% 5% 7% 9% 30%	4760
	11th to 20th	Day	19% 9% 3 7% 4 4 4 3 6% 8% 33%	4668
	21st to end	Day	17% 8% 3 7% 5% 5% 6% 5% 7% 7% 32%	4610
August	1st to 10th	Day	21% 8% 3 8% 5% 5% 5% 4 6% 7% 27%	4105
	11th to 20th	Day	17% 7% 2 7% 4 4 4 5% 6% 8% 36%	4045
	21st to end	Day	13% 6% 2 5% 4 4 4 4 6% 7% 44%	4446
September	1st to 10th	Day	15% 6% 2 6% 3 5% 5% 4 6% 7% 41%	2280
	11th to 20th	Day	18% 7% 3 6% 3 4 5% 3 4 5% 42%	2147
	21st to end	Day	20% 6% 2 5% 3 3 4 3 4 7% 42%	2067
October	1st to 10th	Day	17% 8% 3 6% 4 4 4 3 5% 7% 39%	1900
	11th to 20th	Day	21% 8% 2 7% 4 3 4 3 5% 6% 36%	1900
	21st to end	Day	20% 10% 3 8% 5% 4 4 3 5% 6% 33%	2052
November	1st to 10th	Day	22% 10% 3 8% 5% 4 4 3 4 5% 32%	1617
	11th to 20th	Day	20% 11% 3 7% 5% 4 4 3 4 5% 34%	1600
	21st to end	Day	20% 11% 4 9% 5% 4 5% 3 4 6% 29%	1600
December	1st to 10th	Day	19% 12% 3 7% 4 4 4 4 6% 7% 31%	2610
	11th to 20th	Day	24% 12% 3 7% 4 3 3 2 3 4 33%	2881
	21st to end	Day	17% 12% 5% 7% 5% 4 4 3 5% 5% 32%	3476
January	1st to 10th	Night	11% 14% 4 9% 6% 4 4 3 5% 6% 34%	6808
	11th to 20th	Night	16% 13% 4 9% 5% 4 4 4 5% 6% 30%	6361
	21st to end	Night	10% 10% 5% 8% 5% 5% 4 3 5% 6% 39%	6490
February	1st to 10th	Night	18% 11% 3 8% 5% 5% 4 3 6% 6% 31%	2600
	11th to 20th	Night	15% 14% 4 7% 5% 5% 4 3 4 6% 31%	2533
	21st to end	Night	13% 13% 5% 7% 5% 4 4 4 4 6% 34%	2101
March	1st to 10th	Night	23% 15% 4 9% 5% 4 4 2 4 4 26%	4964
	11th to 20th	Night	19% 13% 6% 9% 5% 4 4 3 5% 6% 27%	4979
	21st to end	Night	28% 13% 4 8% 4 4 4 3 3 4 25%	5466
April	1st to 10th	Night	22% 14% 3 8% 5% 4 4 3 4 5% 28%	2048
	11th to 20th	Night	20% 9% 4 7% 4 4 4 3 5% 7% 32%	1733
	21st to end	Night	20% 12% 5% 7% 5% 5% 3 3 5% 5% 31%	1710
May	1st to 10th	Night	19% 11% 5% 8% 5% 5% 6% 4 6% 6% 28%	2784
	11th to 20th	Night	19% 7% 2 6% 4 3 4 4 5% 7% 38%	2506
	21st to end	Night	18% 9% 4 8% 5% 5% 5% 4 6% 7% 28%	2749
June	1st to 10th	Night	24% 10% 3 7% 5% 5% 4 4 4 7% 26%	1402
	11th to 20th	Night	20% 8% 3 7% 5% 3 4 3 5% 6% 34%	1330
	21st to end	Night	27% 9% 2 6% 5% 4 5% 5% 5% 6% 26%	1330
July	1st to 10th	Night	18% 9% 3 7% 6% 5% 6% 4 7% 8% 28%	2210
	11th to 20th	Night	20% 9% 2 6% 5% 4 5% 4 7% 8% 30%	2269
	21st to end	Night	18% 7% 3 6% 4 5% 4 4 5% 7% 36%	2933
August	1st to 10th	Night	20% 9% 3 8% 5% 6% 4 3 5% 7% 28%	2825
	11th to 20th	Night	14% 7% 2 7% 5% 5% 5% 4 6% 9% 36%	2782
	21st to end	Night	13% 6% 1 6% 4 4 4 3 5% 6% 47%	3210
September	1st to 10th	Night	15% 6% 2 6% 4 4 4 3 7% 6% 43%	1900
	11th to 20th	Night	18% 7% 3 5% 4 3 3 3 4 6% 44%	2030
	21st to end	Night	20% 7% 2 4 3 5% 4 3 4 6% 41%	2112
October	1st to 10th	Night	19% 8% 3 6% 4 3 3 3 5% 6% 39%	2280
	11th to 20th	Night	19% 8% 3 7% 4 4 4 3 5% 7% 37%	2280
	21st to end	Night	24% 9% 3 6% 5% 4 3 2 4 6% 34%	2542
November	1st to 10th	Night	22% 9% 2 6% 4 4 4 3 5% 5% 35%	2681
	11th to 20th	Night	21% 9% 4 7% 4 4 5% 4 6% 6% 31%	2800
	21st to end	Night	21% 10% 3 8% 5% 4 4 4 5% 7% 30%	2800
December	1st to 10th	Night	16% 10% 4 7% 4 4 4 3 5% 7% 35%	4580
	11th to 20th	Night	23% 13% 4 7% 3 3 3 3 4 4 34%	5323
	21st to end	Night	20% 14% 5% 8% 5% 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	40% 29% 9% 15% 6% 1	3158
	11th to 20th	Day	38% 27% 11% 17% 7%	3558
	21st to end	Day	32% 30% 9% 11% 12% 6%	4466
February	1st to 10th	Day	22% 61% 3 8% 5% 2	1800
	11th to 20th	Day	20% 61% 4 8% 6% 1	1761
	21st to end	Day	19% 61% 4 8% 6% 2	1525
March	1st to 10th	Day	45% 29% 6% 9% 8% 3	4880
	11th to 20th	Day	41% 31% 11% 11% 4 1	4980
	21st to end	Day	48% 29% 4 11% 6% 1	5466
April	1st to 10th	Day	23% 61% 3 5% 5% 2	2351
	11th to 20th	Day	20% 65% 4 8% 3	2400
	21st to end	Day	21% 65% 4 5% 4 1	2470
May	1st to 10th	Day	33% 45% 7% 11% 3	4170
	11th to 20th	Day	28% 42% 12% 14% 3	4402
	21st to end	Day	32% 47% 10% 8% 3	4836
June	1st to 10th	Day	19% 65% 4 8% 3	2792
	11th to 20th	Day	17% 65% 6% 8% 3	2850
	21st to end	Day	20% 63% 4 8% 5%	2850
July	1st to 10th	Day	33% 38% 10% 12% 8%	4685
	11th to 20th	Day	32% 38% 9% 18% 4	4587
	21st to end	Day	29% 39% 10% 16% 4	4463
August	1st to 10th	Day	36% 39% 8% 14% 3	4092
	11th to 20th	Day	28% 40% 9% 14% 10%	4084
	21st to end	Day	22% 38% 10% 16% 13% 1	4446
September	1st to 10th	Day	15% 61% 6% 11% 7%	2280
	11th to 20th	Day	20% 60% 5% 10% 5%	2147
	21st to end	Day	13% 60% 5% 13% 7%	2067
October	1st to 10th	Day	28% 38% 7% 18% 8%	3160
	11th to 20th	Day	24% 37% 6% 21% 11%	3140
	21st to end	Day	25% 37% 11% 14% 12% 1	3366
November	1st to 10th	Day	26% 56% 5% 10% 3 1	1617
	11th to 20th	Day	25% 57% 5% 6% 6% 1	1600
	21st to end	Day	26% 57% 5% 9% 3	1600
December	1st to 10th	Day	31% 35% 9% 19% 5%	2610
	11th to 20th	Day	38% 32% 5% 10% 12% 2	2880
	21st to end	Day	38% 27% 10% 14% 10% 1	3476
January	1st to 10th	Night	37% 28% 8% 22% 5% 1	6808
	11th to 20th	Night	39% 29% 11% 16% 5%	6406
	21st to end	Night	33% 29% 6% 15% 12% 4	6490
February	1st to 10th	Night	21% 62% 4 6% 6% 1	2600
	11th to 20th	Night	20% 61% 3 9% 6%	2536
	21st to end	Night	20% 61% 3 7% 7% 2	2101
March	1st to 10th	Night	48% 28% 4 7% 9% 4	4973
	11th to 20th	Night	40% 32% 11% 9% 7% 1	4980
	21st to end	Night	48% 29% 3 11% 8% 1	5466
April	1st to 10th	Night	22% 61% 2 6% 5% 3	2048
	11th to 20th	Night	20% 65% 4 7% 4	1733
	21st to end	Night	22% 64% 3 5% 5% 1	1710
May	1st to 10th	Night	30% 48% 10% 9% 2	2790
	11th to 20th	Night	25% 43% 13% 15% 3	2507
	21st to end	Night	33% 46% 11% 7% 2	2750
June	1st to 10th	Night	19% 66% 4 9% 3	1402
	11th to 20th	Night	17% 64% 5% 10% 3 1	1330
	21st to end	Night	20% 63% 4 6% 6% 1	1330
July	1st to 10th	Night	34% 39% 7% 11% 9% 1	2175
	11th to 20th	Night	31% 40% 11% 12% 5%	2227
	21st to end	Night	27% 38% 9% 16% 9%	2840
August	1st to 10th	Night	38% 40% 7% 11% 3	2813
	11th to 20th	Night	25% 41% 11% 14% 8% 1	2809
	21st to end	Night	21% 38% 10% 17% 14%	3209
September	1st to 10th	Night	14% 61% 6% 12% 6% 1	1900
	11th to 20th	Night	18% 59% 6% 12% 5%	2030
	21st to end	Night	14% 60% 6% 13% 6% 1	2112
October	1st to 10th	Night	33% 37% 8% 15% 8%	3800
	11th to 20th	Night	20% 37% 8% 18% 18% 1	3779
	21st to end	Night	26% 36% 9% 15% 13%	4178
November	1st to 10th	Night	23% 56% 7% 9% 4 1	2681
	11th to 20th	Night	23% 57% 6% 9% 5% 1	2800
	21st to end	Night	25% 58% 4 7% 5% 1	2800
December	1st to 10th	Night	27% 36% 7% 22% 8%	4580
	11th to 20th	Night	36% 31% 6% 11% 13% 2	5325
	21st to end	Night	41% 26% 7% 14% 10% 1	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	25% 28% 33% 14% 1	200
	11th to 20th	Day	31% 22% 29% 15% 3	286
	21st to end	Day	19% 20% 39% 17% 4	440
February	1st to 10th	Day	27% 25% 26% 18% 4 1	400
	11th to 20th	Day	22% 28% 35% 12% 3	396
	21st to end	Day	17% 24% 37% 19% 3	351
March	1st to 10th	Day	23% 24% 36% 12% 4 1	500
	11th to 20th	Day	21% 25% 32% 18% 3	500
	21st to end	Day	26% 24% 32% 13% 4 1	550
April	1st to 10th	Day	32% 27% 26% 13% 2	500
	11th to 20th	Day	23% 23% 32% 16% 6%	452
	21st to end	Day	24% 20% 29% 18% 8% 2	460
May	1st to 10th	Day	25% 19% 32% 17% 5% 1	487
	11th to 20th	Day	22% 15% 30% 23% 9% 1	674
	21st to end	Day	21% 17% 32% 24% 5% 1	735
June	1st to 10th	Day	28% 15% 27% 21% 7% 1	680
	11th to 20th	Day	23% 14% 30% 25% 8% 1	680
	21st to end	Day	28% 11% 26% 24% 10% 2	680
July	1st to 10th	Day	22% 12% 31% 25% 9% 1	670
	11th to 20th	Day	18% 8% 32% 26% 15% 1	668
	21st to end	Day	19% 9% 31% 31% 9% 1	623
August	1st to 10th	Day	17% 8% 31% 31% 11% 1	486
	11th to 20th	Day	19% 11% 27% 27% 13% 1	479
	21st to end	Day	17% 14% 24% 31% 11% 3	539
September	1st to 10th	Day	14% 12% 33% 30% 9% 2	490
	11th to 20th	Day	19% 13% 29% 26% 11% 3	490
	21st to end	Day	18% 16% 32% 23% 10% 1	477
October	1st to 10th	Day	20% 14% 26% 26% 12% 2	390
	11th to 20th	Day	24% 18% 29% 20% 8% 1	390
	21st to end	Day	25% 19% 34% 15% 6%	429
November	1st to 10th	Day	27% 21% 30% 17% 5% 1	395
	11th to 20th	Day	28% 24% 28% 15% 5% 1	400
	21st to end	Day	28% 27% 32% 12% 2	400
December	1st to 10th	Day	31% 21% 30% 17% 2	400
	11th to 20th	Day	36% 27% 25% 11% 1	350
	21st to end	Day	25% 25% 31% 15% 2	220
January	1st to 10th	Night	26% 25% 29% 18% 2	900
	11th to 20th	Night	27% 22% 30% 17% 4	855
	21st to end	Night	20% 24% 35% 16% 4	880
February	1st to 10th	Night	27% 24% 30% 17% 2	800
	11th to 20th	Night	24% 26% 33% 14% 2	783
	21st to end	Night	20% 23% 34% 18% 4	660
March	1st to 10th	Night	24% 20% 36% 18% 2	800
	11th to 20th	Night	22% 19% 33% 21% 6%	800
	21st to end	Night	24% 19% 33% 17% 5%	880
April	1st to 10th	Night	29% 18% 29% 21% 3	648
	11th to 20th	Night	23% 17% 34% 21% 5%	567
	21st to end	Night	27% 14% 30% 21% 7% 1	570
May	1st to 10th	Night	25% 13% 32% 21% 8% 1	570
	11th to 20th	Night	24% 12% 29% 27% 9%	562
	21st to end	Night	18% 13% 36% 26% 6%	616
June	1st to 10th	Night	26% 10% 29% 28% 6% 1	452
	11th to 20th	Night	23% 10% 24% 35% 8%	380
	21st to end	Night	26% 8% 23% 32% 11% 1	380
July	1st to 10th	Night	21% 8% 28% 32% 11%	370
	11th to 20th	Night	17% 11% 25% 36% 10% 1	401
	21st to end	Night	18% 7% 26% 38% 10%	623
August	1st to 10th	Night	15% 6% 33% 32% 13% 1	568
	11th to 20th	Night	19% 7% 24% 32% 18% 1	562
	21st to end	Night	14% 9% 28% 31% 16% 2	627
September	1st to 10th	Night	16% 8% 32% 32% 11% 1	570
	11th to 20th	Night	18% 12% 25% 30% 14% 1	700
	21st to end	Night	21% 12% 29% 25% 10% 2	760
October	1st to 10th	Night	24% 11% 29% 24% 11% 1	760
	11th to 20th	Night	23% 16% 30% 22% 8% 1	760
	21st to end	Night	29% 20% 29% 18% 4	836
November	1st to 10th	Night	27% 21% 27% 18% 6% 1	853
	11th to 20th	Night	26% 23% 27% 17% 5% 1	900
	21st to end	Night	27% 23% 28% 18% 3	900
December	1st to 10th	Night	29% 22% 30% 16% 3	900
	11th to 20th	Night	29% 27% 28% 13% 3	900
	21st to end	Night	30% 24% 26% 16% 3 1	990

Page generated at 2025-04-08 10:17:26. Version ac07

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