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 2026-08-15.

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 7% 5% 4 4 4 5% 7% 32%	144357
	Night	18% 11% 4 7% 5% 4 4 3 5% 6% 33%	137690
Transparency	Day	34% 35% 8% 14% 8% 1	147911
	Night	34% 35% 7% 14% 9% 1	142225
Seeing	Day	24% 18% 30% 20% 6% 1	19206
	Night	24% 18% 30% 22% 6% 1	26740

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% 15% 5% 10% 5% 5% 4 4 5% 6% 29%	4093
	11th to 20th	Day	15% 16% 5% 10% 6% 5% 4 3 4 4 27%	4613
	21st to end	Day	9% 10% 4 8% 4 4 4 4 6% 8% 39%	5781
February	1st to 10th	Day	15% 13% 4 10% 4 5% 4 4 4 5% 30%	1890
	11th to 20th	Day	14% 14% 4 9% 6% 5% 4 4 5% 5% 30%	1843
	21st to end	Day	11% 15% 5% 9% 6% 3 4 3 5% 6% 34%	1599
March	1st to 10th	Day	20% 15% 4 12% 4 4 3 3 3 4 27%	4984
	11th to 20th	Day	17% 18% 5% 8% 4 4 4 3 5% 6% 27%	5090
	21st to end	Day	24% 15% 6% 7% 5% 4 4 4 6% 6% 20%	5587
April	1st to 10th	Day	21% 16% 5% 7% 4 4 4 4 5% 5% 26%	2469
	11th to 20th	Day	19% 15% 3 7% 5% 4 3 3 5% 6% 30%	2656
	21st to end	Day	21% 13% 4 7% 4 4 3 3 5% 6% 30%	2730
May	1st to 10th	Day	28% 13% 4 8% 5% 4 4 3 4 6% 23%	7716
	11th to 20th	Day	16% 10% 3 8% 5% 5% 5% 4 4 6% 33%	8220
	21st to end	Day	21% 11% 4 7% 4 4 5% 4 5% 6% 28%	9059
June	1st to 10th	Day	23% 10% 3 8% 4 5% 4 4 6% 6% 26%	3086
	11th to 20th	Day	20% 9% 2 6% 5% 4 4 4 6% 8% 31%	3150
	21st to end	Day	28% 9% 3 7% 5% 4 4 3 4 5% 27%	3150
July	1st to 10th	Day	15% 8% 3 7% 5% 5% 6% 5% 7% 10% 30%	8880
	11th to 20th	Day	14% 7% 3 6% 4 4 5% 4 6% 9% 38%	8704
	21st to end	Day	14% 6% 2 7% 5% 5% 5% 4 7% 8% 37%	8622
August	1st to 10th	Day	21% 7% 3 8% 5% 5% 5% 4 6% 7% 29%	4365
	11th to 20th	Day	16% 7% 2 7% 4 4 4 5% 6% 8% 36%	4227
	21st to end	Day	13% 6% 2 5% 4 4 4 4 6% 7% 44%	4586
September	1st to 10th	Day	15% 6% 2 7% 3 5% 5% 4 6% 7% 41%	2400
	11th to 20th	Day	17% 7% 3 6% 3 4 5% 3 4 5% 43%	2260
	21st to end	Day	19% 6% 2 5% 3 3 4 3 4 7% 42%	2176
October	1st to 10th	Day	17% 7% 3 6% 4 4 4 3 5% 7% 40%	2000
	11th to 20th	Day	21% 9% 2 7% 4 4 4 3 5% 6% 35%	2000
	21st to end	Day	20% 10% 3 8% 5% 4 4 4 5% 6% 32%	2160
November	1st to 10th	Day	22% 10% 3 8% 5% 4 4 3 4 5% 32%	1700
	11th to 20th	Day	19% 11% 3 7% 5% 4 5% 3 4 5% 34%	1680
	21st to end	Day	20% 10% 4 9% 5% 4 5% 3 4 7% 28%	1680
December	1st to 10th	Day	19% 13% 3 7% 4 4 4 3 6% 6% 31%	2690
	11th to 20th	Day	24% 12% 3 7% 4 3 3 2 3 4 33%	2958
	21st to end	Day	17% 12% 5% 7% 5% 4 4 3 5% 5% 32%	3553
January	1st to 10th	Night	11% 15% 5% 9% 5% 4 4 3 5% 6% 33%	8831
	11th to 20th	Night	20% 15% 4 9% 5% 4 4 4 4 6% 26%	8281
	21st to end	Night	9% 11% 5% 7% 4 4 4 4 6% 7% 40%	8400
February	1st to 10th	Night	17% 11% 3 8% 5% 5% 4 4 6% 6% 31%	2730
	11th to 20th	Night	15% 13% 4 7% 5% 5% 5% 4 4 6% 32%	2663
	21st to end	Night	12% 13% 5% 7% 5% 4 4 4 5% 6% 34%	2203
March	1st to 10th	Night	23% 15% 4 9% 5% 4 4 2 4 4 26%	5076
	11th to 20th	Night	19% 13% 6% 9% 5% 4 4 3 5% 6% 27%	5089
	21st to end	Night	27% 14% 4 8% 4 4 4 3 3 4 25%	5587
April	1st to 10th	Night	22% 14% 3 8% 5% 4 4 3 4 5% 28%	2150
	11th to 20th	Night	21% 10% 4 7% 4 4 4 3 5% 7% 32%	1910
	21st to end	Night	19% 12% 5% 7% 5% 5% 3 3 5% 6% 30%	1890
May	1st to 10th	Night	25% 13% 4 7% 5% 5% 5% 3 5% 5% 23%	5171
	11th to 20th	Night	19% 9% 3 7% 5% 4 5% 3 5% 6% 33%	4670
	21st to end	Night	17% 10% 5% 9% 5% 5% 5% 4 5% 6% 30%	5147
June	1st to 10th	Night	23% 10% 3 7% 5% 5% 4 4 5% 7% 28%	1550
	11th to 20th	Night	20% 8% 3 7% 5% 3 4 3 5% 6% 34%	1470
	21st to end	Night	26% 9% 2 6% 5% 4 5% 5% 6% 7% 26%	1470
July	1st to 10th	Night	16% 8% 3 7% 6% 5% 6% 4 7% 8% 30%	4110
	11th to 20th	Night	14% 8% 3 6% 4 4 4 4 6% 9% 39%	4225
	21st to end	Night	17% 6% 2 6% 4 4 5% 4 5% 7% 40%	5455
August	1st to 10th	Night	20% 9% 3 8% 5% 5% 4 3 5% 7% 31%	3005
	11th to 20th	Night	13% 7% 2 7% 5% 5% 5% 4 6% 9% 36%	2909
	21st to end	Night	13% 6% 1 6% 4 4 4 3 5% 7% 47%	3312
September	1st to 10th	Night	15% 6% 2 6% 4 4 4 3 7% 6% 43%	2000
	11th to 20th	Night	17% 7% 3 5% 4 3 3 3 4 6% 45%	2137
	21st to end	Night	20% 7% 2 4 3 5% 4 3 4 6% 42%	2223
October	1st to 10th	Night	19% 8% 2 6% 3 3 3 3 5% 6% 41%	2400
	11th to 20th	Night	19% 8% 3 7% 4 4 4 3 5% 6% 36%	2400
	21st to end	Night	25% 9% 3 6% 5% 4 3 2 4 6% 33%	2676
November	1st to 10th	Night	23% 9% 2 6% 4 4 4 3 5% 5% 35%	2818
	11th to 20th	Night	21% 10% 4 7% 4 4 5% 4 6% 6% 31%	2940
	21st to end	Night	20% 10% 3 8% 5% 4 4 4 5% 6% 30%	2940
December	1st to 10th	Night	16% 10% 4 7% 4 4 4 3 5% 7% 35%	4720
	11th to 20th	Night	23% 13% 4 7% 3 3 3 3 4 4 34%	5465
	21st to end	Night	20% 14% 5% 7% 5% 3 3 3 4 5% 32%	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	42% 23% 9% 15% 10% 1	4094
	11th to 20th	Day	46% 21% 10% 15% 7% 1	4643
	21st to end	Day	33% 23% 8% 15% 15% 5%	5781
February	1st to 10th	Day	23% 58% 3 9% 4 2	1890
	11th to 20th	Day	22% 58% 5% 9% 6% 1	1851
	21st to end	Day	21% 58% 4 8% 7% 2	1599
March	1st to 10th	Day	45% 29% 6% 9% 8% 3	4988
	11th to 20th	Day	41% 31% 11% 11% 4 1	5090
	21st to end	Day	49% 29% 4 11% 6% 1	5587
April	1st to 10th	Day	24% 59% 4 6% 6% 2	2469
	11th to 20th	Day	24% 59% 4 9% 3	2656
	21st to end	Day	24% 59% 4 6% 5% 2	2730
May	1st to 10th	Day	48% 26% 8% 12% 6%	7728
	11th to 20th	Day	39% 25% 13% 17% 5% 1	8224
	21st to end	Day	45% 27% 8% 11% 9% 1	9060
June	1st to 10th	Day	21% 60% 5% 9% 4	3086
	11th to 20th	Day	20% 59% 7% 10% 4	3150
	21st to end	Day	23% 58% 4 9% 5%	3150
July	1st to 10th	Day	39% 24% 12% 15% 10%	8805
	11th to 20th	Day	32% 22% 12% 25% 7% 1	8623
	21st to end	Day	33% 23% 12% 25% 7%	8433
August	1st to 10th	Day	35% 37% 8% 15% 4	4352
	11th to 20th	Day	27% 38% 10% 14% 10% 1	4266
	21st to end	Day	23% 37% 10% 17% 13% 1	4586
September	1st to 10th	Day	15% 58% 6% 13% 7%	2400
	11th to 20th	Day	21% 57% 5% 12% 6%	2260
	21st to end	Day	14% 57% 5% 14% 9%	2176
October	1st to 10th	Day	28% 37% 7% 19% 9%	3260
	11th to 20th	Day	26% 36% 7% 21% 11%	3240
	21st to end	Day	26% 36% 11% 14% 12% 1	3474
November	1st to 10th	Day	27% 53% 6% 10% 3 1	1700
	11th to 20th	Day	26% 54% 6% 8% 6% 1	1680
	21st to end	Day	27% 54% 6% 9% 4	1680
December	1st to 10th	Day	32% 34% 9% 19% 5%	2690
	11th to 20th	Day	39% 31% 5% 11% 12% 2	2957
	21st to end	Day	39% 26% 10% 14% 11% 1	3553
January	1st to 10th	Night	40% 22% 8% 22% 8% 1	8831
	11th to 20th	Night	47% 22% 9% 15% 6%	8326
	21st to end	Night	34% 23% 8% 16% 15% 4	8400
February	1st to 10th	Night	22% 59% 4 7% 6% 1	2730
	11th to 20th	Night	21% 58% 3 11% 7%	2666
	21st to end	Night	21% 58% 3 8% 7% 2	2203
March	1st to 10th	Night	48% 28% 4 8% 9% 4	5085
	11th to 20th	Night	41% 31% 11% 9% 7% 1	5090
	21st to end	Night	48% 29% 3 11% 8% 1	5587
April	1st to 10th	Night	24% 58% 3 7% 6% 3	2150
	11th to 20th	Night	24% 59% 4 8% 4	1910
	21st to end	Night	24% 58% 4 7% 6% 1	1890
May	1st to 10th	Night	48% 27% 8% 12% 4	5177
	11th to 20th	Night	41% 26% 9% 16% 6% 1	4671
	21st to end	Night	42% 27% 10% 11% 8% 2	5148
June	1st to 10th	Night	21% 60% 5% 11% 3	1550
	11th to 20th	Night	20% 59% 5% 11% 4 1	1470
	21st to end	Night	22% 58% 6% 7% 6%	1470
July	1st to 10th	Night	40% 23% 9% 17% 10%	4075
	11th to 20th	Night	32% 23% 12% 23% 9%	4183
	21st to end	Night	32% 23% 10% 23% 12%	5330
August	1st to 10th	Night	37% 38% 8% 13% 4	2993
	11th to 20th	Night	26% 39% 12% 13% 9% 1	2936
	21st to end	Night	21% 37% 10% 17% 13%	3311
September	1st to 10th	Night	15% 58% 6% 14% 7% 1	2000
	11th to 20th	Night	18% 56% 7% 13% 5%	2137
	21st to end	Night	14% 57% 6% 14% 7% 1	2223
October	1st to 10th	Night	32% 36% 8% 15% 9%	3920
	11th to 20th	Night	21% 36% 8% 17% 17% 1	3899
	21st to end	Night	28% 35% 9% 15% 13%	4312
November	1st to 10th	Night	24% 53% 7% 10% 5% 1	2818
	11th to 20th	Night	24% 54% 6% 10% 4 1	2940
	21st to end	Night	26% 56% 4 8% 5% 1	2940
December	1st to 10th	Night	28% 35% 7% 22% 8%	4720
	11th to 20th	Night	37% 31% 6% 11% 13% 2	5467
	21st to end	Night	41% 25% 7% 15% 10% 1	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	26% 28% 31% 14% 1	220
	11th to 20th	Day	33% 21% 28% 14% 3	311
	21st to end	Day	21% 21% 38% 16% 4	473
February	1st to 10th	Day	25% 24% 27% 19% 4	430
	11th to 20th	Day	22% 27% 35% 14% 3	426
	21st to end	Day	19% 24% 36% 18% 2	377
March	1st to 10th	Day	24% 26% 35% 11% 3 1	540
	11th to 20th	Day	24% 25% 30% 17% 3	540
	21st to end	Day	29% 24% 32% 12% 3 1	594
April	1st to 10th	Day	33% 27% 26% 12% 2	540
	11th to 20th	Day	29% 23% 29% 14% 5%	532
	21st to end	Day	25% 21% 28% 17% 7% 1	540
May	1st to 10th	Day	28% 20% 32% 15% 5% 1	569
	11th to 20th	Day	24% 16% 30% 20% 8% 1	774
	21st to end	Day	23% 17% 31% 23% 5% 1	845
June	1st to 10th	Day	27% 16% 28% 21% 7% 1	780
	11th to 20th	Day	24% 15% 30% 23% 7% 1	780
	21st to end	Day	27% 12% 27% 23% 9% 2	780
July	1st to 10th	Day	21% 13% 33% 24% 8% 1	770
	11th to 20th	Day	18% 11% 32% 25% 13% 1	768
	21st to end	Day	19% 10% 31% 30% 9% 1	721
August	1st to 10th	Day	17% 9% 33% 30% 10% 1	566
	11th to 20th	Day	18% 12% 29% 27% 13% 1	535
	21st to end	Day	18% 15% 25% 29% 11% 3	583
September	1st to 10th	Day	14% 13% 33% 29% 9% 2	530
	11th to 20th	Day	19% 13% 30% 25% 10% 3	530
	21st to end	Day	17% 17% 33% 22% 9% 1	516
October	1st to 10th	Day	20% 15% 28% 25% 11% 1	420
	11th to 20th	Day	23% 18% 30% 19% 8% 1	420
	21st to end	Day	26% 20% 32% 15% 6%	462
November	1st to 10th	Day	29% 21% 29% 16% 5% 1	425
	11th to 20th	Day	28% 24% 28% 14% 5%	430
	21st to end	Day	28% 27% 31% 11% 3	430
December	1st to 10th	Day	31% 22% 29% 16% 2	430
	11th to 20th	Day	37% 27% 25% 10% 1	377
	21st to end	Day	27% 26% 30% 14% 2	242
January	1st to 10th	Night	25% 25% 30% 17% 2	950
	11th to 20th	Night	28% 22% 30% 17% 4	900
	21st to end	Night	21% 24% 35% 16% 4	924
February	1st to 10th	Night	25% 24% 32% 17% 3	840
	11th to 20th	Night	24% 25% 33% 15% 3	823
	21st to end	Night	21% 23% 34% 18% 4	692
March	1st to 10th	Night	24% 21% 36% 17% 2	840
	11th to 20th	Night	23% 19% 32% 20% 5%	840
	21st to end	Night	25% 20% 32% 17% 5%	924
April	1st to 10th	Night	29% 19% 29% 20% 3	680
	11th to 20th	Night	25% 18% 32% 20% 5%	624
	21st to end	Night	27% 14% 30% 21% 7% 1	630
May	1st to 10th	Night	27% 14% 30% 20% 8% 1	630
	11th to 20th	Night	25% 13% 29% 25% 8%	622
	21st to end	Night	19% 14% 35% 25% 6%	682
June	1st to 10th	Night	26% 10% 29% 29% 6% 1	500
	11th to 20th	Night	24% 10% 25% 33% 8%	420
	21st to end	Night	26% 8% 22% 32% 11% 1	420
July	1st to 10th	Night	20% 8% 28% 34% 10%	410
	11th to 20th	Night	17% 12% 26% 35% 9% 1	445
	21st to end	Night	19% 7% 27% 36% 10%	689
August	1st to 10th	Night	15% 6% 33% 32% 14% 1	628
	11th to 20th	Night	18% 7% 25% 33% 17% 1	605
	21st to end	Night	13% 9% 29% 31% 15% 2	660
September	1st to 10th	Night	16% 8% 32% 32% 11% 1	600
	11th to 20th	Night	18% 12% 25% 30% 14% 2	737
	21st to end	Night	20% 13% 30% 25% 10% 2	800
October	1st to 10th	Night	23% 12% 28% 25% 11% 1	800
	11th to 20th	Night	23% 16% 30% 21% 8% 1	800
	21st to end	Night	30% 20% 29% 18% 4	880
November	1st to 10th	Night	29% 21% 27% 17% 6% 1	900
	11th to 20th	Night	27% 23% 28% 17% 5% 1	950
	21st to end	Night	27% 23% 29% 17% 4	950
December	1st to 10th	Night	30% 22% 30% 16% 3	950
	11th to 20th	Night	30% 27% 28% 12% 2	950
	21st to end	Night	31% 24% 26% 15% 3 1	1045

Page generated at 2026-08-12 04:37:17. Version ac07

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